Merge pull request #11667 from louis-6wind/flexalgo-mpls

isisd: Flex-Algo for SR-MPLS

doc/user/isisd.rst

@@ -316,12 +316,12 @@ Showing ISIS information
    Show the ISIS database globally, for a specific LSP id without or with
    details.
 
-.. clicmd:: show isis topology [level-1|level-2]
+.. clicmd:: show isis topology [level-1|level-2] [algorithm (128-255)]
 
    Show topology IS-IS paths to Intermediate Systems, globally, in area
    (level-1) or domain (level-2).
 
-.. clicmd:: show isis route [level-1|level-2] [prefix-sid|backup]
+.. clicmd:: show isis route [level-1|level-2] [prefix-sid|backup] [algorithm (128-255)]
 
    Show the ISIS routing table, as determined by the most recent SPF
    calculation.
@@ -389,8 +389,7 @@ Traffic Engineering
 
    :ref:`ospf-traffic-engineering`
 
-
-.. _debugging-isis:
+.. _isis-segment-routing:
 
 Segment Routing
 ===============
@@ -423,7 +422,7 @@ Known limitations:
    MPLS dataplane. E.g. for Linux kernel, since version 4.13 the maximum value
    is 32.
 
-.. clicmd:: segment-routing prefix <A.B.C.D/M|X:X::X:X/M> <absolute (16-1048575)|index (0-65535) [no-php-flag|explicit-null] [n-flag-clear]
+.. clicmd:: segment-routing prefix <A.B.C.D/M|X:X::X:X/M> [algorithm (128-255)] <absolute (16-1048575)|index (0-65535) [no-php-flag|explicit-null] [n-flag-clear]
 
    prefix. The 'no-php-flag' means NO Penultimate Hop Popping that allows SR
    node to request to its neighbor to not pop the label. The 'explicit-null'
@@ -432,10 +431,164 @@ Known limitations:
    clear the Node flag that is set by default for Prefix-SIDs associated to
    loopback addresses. This option is necessary to configure Anycast-SIDs.
 
-.. clicmd:: show isis segment-routing node
+.. clicmd:: show isis segment-routing node [algorithm (128-255)]
 
    Show detailed information about all learned Segment Routing Nodes.
 
+.. _isis-flex-algo:
+
+Flex-Algos (Flex-Algo)
+======================
+
+*isisd* supports some features of
+`RFC 9350 <https://tools.ietf.org/html/rfc9350>`_ on an MPLS Segment-Routing
+dataplane. The compatibility has been tested against Cisco.
+
+IS-IS uses by default the `Shortest-Path-First` algorithm that basically
+calculates paths based on the shortest total metric to the destinations.
+Flex-Algo allows new algorithms to run in parallel to compute paths in different
+manners, based on metrics (IGP metric or a new type of metrics such as Traffic
+Engineering (TE) metric and minimum delay...) and constraints. New metric types
+are not yet implemented but constraints are already operational. Constraints can
+restrict paths to links with specific affinities or avoid links with specific
+affinities. Combinations of these are also possible.
+
+The administrator can configure up to 128 Flex-Algos in an IS-IS area.
+To do so, it defines a set of Flex-Algo Definitions (FAD) which
+have the following characteristics:
+
+- a numeric identifier (ID) between 128 and 255 inclusive
+- a set of constraints (basically, include or exclude a certain given set of
+	links, designated by a admin-group)
+- the calculation type (only the `Shortest-Path-First` is currently supported)
+- the metric type (only the IGP inherited metric type is currently supported)
+- some additional flags (not supported for the moment).
+
+A subset of routers advertises the Flex-Algo Definitions (FAD) to the other
+routers within an area. In order to use a common set of FADs, each router runs a
+FAD election process for each locally configured algorithm, using the following
+rules:
+
+- If a locally configured FAD is not advertised to the area, the router does not
+	participate in the particular flex algorithm.
+- If a given flex algorithm is running, the participation in this particular
+	flex algorithm stops when its advertisements are over.
+- A router includes its own FAD in the election process if and only if it is
+	advertised to the other routers.
+- If only one router advertises the FAD, the FAD is elected.
+- If several FADs are advertised with different priorities, the one with the
+	highest priority value is selected.
+- If there are multiple advertisements of the FAD with the same highest
+	priority, the FAD of the router with the highest IS-IS system-ID is
+	selected.
+
+Routers only use the specifications of the elected FAD regardless of the locally
+configured definitions. If a router does not support one of the FAD
+characteristics, it stops participating in the Flex-Algo.
+
+For each running Flex-Algo, the Segment-Routing SIDs must be
+configured with values unique to the algorithm. It allows routers to identify
+which flex algorithm they must use for a given packet.
+
+The following commands configure Flex-Algo at the 'router isis' configuration
+level. Segment-Routing prefixes must be configured for the Flex-Algo.
+
+.. clicmd:: flexible-algorithm (128-255)
+
+   Add a Flex-Algo Definition (FAD) and enter the FAD configuration
+   level. The algorithm ID value is in the range of 128 to 255 inclusive.
+
+.. clicmd:: no flexible-algorithm (128-255)
+
+   Unconfigure a Flex-Algo Definition.
+
+.. clicmd:: affinity-map NAME bit-position (0-255)
+
+   Add the specified 'affinity-map'. Affinity-map definitions are used in
+   FADs and in interfaces admin-group definition.
+
+   Affinity-maps format in advertisement TLVs use the extended admin-group
+   format defined in the RFC7308 section 2.2. The extended admin-group uses a
+   256 bits field. If an affinity-map is set, the bit at the extended
+   admin-group 'bit-position' is set 1, else it is set to 0.
+
+The following commands configure Flex-Algo at the 'router isis' and
+'flexible-algorithm (128-255)' configuration level.
+
+.. clicmd:: advertise-definition
+
+   Advertise the current FAD to other IS-IS routers by using specific IS-IS
+   TLVs. By default, the definition is is not shared with other routers.
+
+   A router can advertise a FAD without participating in the Flex-Algo.
+
+.. clicmd:: priority (0-255)
+
+   Set the specified 'priority' in the current FAD advertisements .
+
+.. clicmd:: metric-type [igp|te|delay]
+
+   Set the 'metric-type' for the current FAD. 'igp' is
+   the default value and refers to the classic 'Shortest-Path-First' algorithm.
+   If the 'te' or the 'delay' metric is selected, the value is advertised but
+   the flex algorithm is disabled locally because these types are not currently
+   supported.
+
+.. clicmd:: no metric-type
+
+   Reset the 'metric-type' to the default 'igp' metric.
+
+.. clicmd:: affinity exclude-any NAME
+
+   Add the specified affinity to the list of exclude-any affinities. The
+   Flex-Algo will compute paths that exclude the segments with any of
+   the specified affinities.
+
+.. clicmd:: no affinity exclude-any NAME
+
+   Remove the specified affinity to the list of exclude-any affinities.
+
+.. clicmd:: affinity include-all NAME
+
+   Add the specified affinity to the list of include-all affinities. The
+   Flex-Algo will compute paths that include the segments with all
+   the specified affinities.
+
+.. clicmd:: no affinity include-all NAME
+
+   Remove the specified affinity to the list of include-all affinities.
+
+.. clicmd:: affinity include-any NAME
+
+   Add the specified affinity to the list of include-any affinities. The
+   Flex-Algo will compute paths that include the segments with any of
+   the specified affinities.
+
+.. clicmd:: no affinity include-any NAME
+
+   Remove the specified affinity to the list of include-any affinities.
+
+The following commands configure Flex-Algo at the 'interface' configuration
+level.
+
+.. clicmd:: isis affinity flex-algo NAME
+
+	Add the specified affinity to the interface.
+
+.. clicmd:: no isis affinity flex-algo NAME
+
+	Remove the specified affinity from the interface.
+
+The following command show Flex-Algo information:
+
+.. clicmd:: show isis flex-algo [(128-255)]
+
+	Show information about the elected FADs
+
+'show isis route', 'show isis topology' and 'show isis segment-routing node'
+includes an 'algorithm (128-255)' optional argument. See
+:ref:`showing-isis-information` and :ref:`isis-segment-routing`.
+
 Debugging ISIS
 ==============
 

isisd/fabricd.c

@@ -207,10 +207,10 @@ struct fabricd *fabricd_new(struct isis_area *area)
 	rv->area = area;
 	rv->initial_sync_state = FABRICD_SYNC_PENDING;
 
-	rv->spftree =
-		isis_spftree_new(area, &area->lspdb[IS_LEVEL_2 - 1],
-				 area->isis->sysid, ISIS_LEVEL2, SPFTREE_IPV4,
-				 SPF_TYPE_FORWARD, F_SPFTREE_HOPCOUNT_METRIC);
+	rv->spftree = isis_spftree_new(
+		area, &area->lspdb[IS_LEVEL_2 - 1], area->isis->sysid,
+		ISIS_LEVEL2, SPFTREE_IPV4, SPF_TYPE_FORWARD,
+		F_SPFTREE_HOPCOUNT_METRIC, SR_ALGORITHM_SPF);
 	rv->neighbors = skiplist_new(0, neighbor_entry_list_cmp,
 				     neighbor_entry_del_void);
 	rv->neighbors_neighbors = hash_create(neighbor_entry_hash_key,

isisd/isis_affinitymap.c

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* IS-IS  affinity-map
+ * Copyright 2023 6WIND S.A.
+ */
+
+#include <zebra.h>
+#include "lib/if.h"
+#include "lib/vrf.h"
+#include "isisd/isisd.h"
+#include "isisd/isis_affinitymap.h"
+
+#ifndef FABRICD
+
+static bool isis_affinity_map_check_use(const char *affmap_name)
+{
+	struct isis *isis = isis_lookup_by_vrfid(VRF_DEFAULT);
+	struct isis_area *area;
+	struct listnode *area_node, *fa_node;
+	struct flex_algo *fa;
+	struct affinity_map *map;
+	uint16_t pos;
+
+	map = affinity_map_get(affmap_name);
+	pos = map->bit_position;
+
+	for (ALL_LIST_ELEMENTS_RO(isis->area_list, area_node, area)) {
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, fa_node,
+					  fa)) {
+			if (admin_group_get(&fa->admin_group_exclude_any,
+					    pos) ||
+			    admin_group_get(&fa->admin_group_include_any,
+					    pos) ||
+			    admin_group_get(&fa->admin_group_include_all, pos))
+				return true;
+		}
+	}
+	return false;
+}
+
+static void isis_affinity_map_update(const char *affmap_name, uint16_t old_pos,
+				     uint16_t new_pos)
+{
+	struct isis *isis = isis_lookup_by_vrfid(VRF_DEFAULT);
+	struct listnode *area_node, *fa_node;
+	struct isis_area *area;
+	struct flex_algo *fa;
+	bool changed;
+
+	for (ALL_LIST_ELEMENTS_RO(isis->area_list, area_node, area)) {
+		changed = false;
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, fa_node,
+					  fa)) {
+			if (admin_group_get(&fa->admin_group_exclude_any,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_exclude_any,
+						  old_pos);
+				admin_group_set(&fa->admin_group_exclude_any,
+						new_pos);
+				changed = true;
+			}
+			if (admin_group_get(&fa->admin_group_include_any,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_include_any,
+						  old_pos);
+				admin_group_set(&fa->admin_group_include_any,
+						new_pos);
+				changed = true;
+			}
+			if (admin_group_get(&fa->admin_group_include_all,
+					    old_pos)) {
+				admin_group_unset(&fa->admin_group_include_all,
+						  old_pos);
+				admin_group_set(&fa->admin_group_include_all,
+						new_pos);
+				changed = true;
+			}
+		}
+		if (changed)
+			lsp_regenerate_schedule(area, area->is_type, 0);
+	}
+}
+
+void isis_affinity_map_init(void)
+{
+	affinity_map_init();
+
+	affinity_map_set_check_use_hook(isis_affinity_map_check_use);
+	affinity_map_set_update_hook(isis_affinity_map_update);
+}
+
+#endif /* ifndef FABRICD */

isisd/isis_affinitymap.h

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* IS-IS  affinity-map header
+ * Copyright 2023 6WIND S.A.
+ */
+
+#ifndef __ISIS_AFFINITYMAP_H__
+#define __ISIS_AFFINITYMAP_H__
+
+#include "lib/affinitymap.h"
+
+#ifndef FABRICD
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void isis_affinity_map_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ifndef FABRICD */
+
+#endif /* __ISIS_AFFINITYMAP_H__ */

isisd/isis_cli.c

@@ -23,6 +23,7 @@
 #include "isisd/isis_misc.h"
 #include "isisd/isis_circuit.h"
 #include "isisd/isis_csm.h"
+#include "isisd/isis_flex_algo.h"
 
 #include "isisd/isis_cli_clippy.c"
 
@@ -1126,6 +1127,53 @@ void cli_show_isis_purge_origin(struct vty *vty, const struct lyd_node *dnode,
 	vty_out(vty, " purge-originator\n");
 }
 
+
+/*
+ * XPath: /frr-isisd:isis/instance/admin-group-send-zero
+ */
+DEFPY_YANG(isis_admin_group_send_zero, isis_admin_group_send_zero_cmd,
+	   "[no] admin-group-send-zero",
+	   NO_STR
+	   "Allow sending the default admin-group value of 0x00000000.\n")
+{
+	nb_cli_enqueue_change(vty, "./admin-group-send-zero", NB_OP_MODIFY,
+			      no ? "false" : "true");
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+void cli_show_isis_admin_group_send_zero(struct vty *vty,
+					 const struct lyd_node *dnode,
+					 bool show_defaults)
+{
+	if (!yang_dnode_get_bool(dnode, NULL))
+		vty_out(vty, " no");
+	vty_out(vty, " admin-group-send-zero\n");
+}
+
+
+/*
+ * XPath: /frr-isisd:isis/instance/asla-legacy-flag
+ */
+DEFPY_HIDDEN(isis_asla_legacy_flag, isis_asla_legacy_flag_cmd,
+	     "[no] asla-legacy-flag",
+	     NO_STR "Set the legacy flag (aka. L-FLAG) in the ASLA Sub-TLV.\n")
+{
+	nb_cli_enqueue_change(vty, "./asla-legacy-flag", NB_OP_MODIFY,
+			      no ? "false" : "true");
+
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+void cli_show_isis_asla_legacy_flag(struct vty *vty,
+				    const struct lyd_node *dnode,
+				    bool show_defaults)
+{
+	if (!yang_dnode_get_bool(dnode, NULL))
+		vty_out(vty, " no");
+	vty_out(vty, " asla-legacy-flag\n");
+}
+
 /*
  * XPath: /frr-isisd:isis/instance/mpls-te
  */
@@ -1769,6 +1817,122 @@ void cli_show_isis_prefix_sid(struct vty *vty, const struct lyd_node *dnode,
 	vty_out(vty, "\n");
 }
 
+#ifndef FABRICD
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid
+ */
+DEFPY_YANG(
+	isis_sr_prefix_sid_algorithm, isis_sr_prefix_sid_algorithm_cmd,
+	"segment-routing prefix <A.B.C.D/M|X:X::X:X/M>$prefix\
+              algorithm (128-255)$algorithm\
+              <absolute$sid_type (16-1048575)$sid_value|index$sid_type (0-65535)$sid_value>\
+              [<no-php-flag|explicit-null>$lh_behavior] [n-flag-clear$n_flag_clear]",
+	SR_STR
+	"Prefix SID\n"
+	"IPv4 Prefix\n"
+	"IPv6 Prefix\n"
+	"Algorithm Specific Prefix SID Configuration\n"
+	"Algorithm number\n"
+	"Specify the absolute value of Prefix Segment ID\n"
+	"The Prefix Segment ID value\n"
+	"Specify the index of Prefix Segment ID\n"
+	"The Prefix Segment ID index\n"
+	"Don't request Penultimate Hop Popping (PHP)\n"
+	"Upstream neighbor must replace prefix-sid with explicit null label\n"
+	"Not a node SID\n")
+{
+	nb_cli_enqueue_change(vty, ".", NB_OP_CREATE, NULL);
+	nb_cli_enqueue_change(vty, "./sid-value-type", NB_OP_MODIFY, sid_type);
+	nb_cli_enqueue_change(vty, "./sid-value", NB_OP_MODIFY, sid_value_str);
+	if (lh_behavior) {
+		const char *value;
+
+		if (strmatch(lh_behavior, "no-php-flag"))
+			value = "no-php";
+		else if (strmatch(lh_behavior, "explicit-null"))
+			value = "explicit-null";
+		else
+			value = "php";
+
+		nb_cli_enqueue_change(vty, "./last-hop-behavior", NB_OP_MODIFY,
+				      value);
+	} else
+		nb_cli_enqueue_change(vty, "./last-hop-behavior", NB_OP_MODIFY,
+				      NULL);
+	nb_cli_enqueue_change(vty, "./n-flag-clear", NB_OP_MODIFY,
+			      n_flag_clear ? "true" : "false");
+
+	return nb_cli_apply_changes(
+		vty,
+		"./segment-routing/algorithm-prefix-sids/algorithm-prefix-sid[prefix='%s'][algo='%s']",
+		prefix_str, algorithm_str);
+}
+
+DEFPY_YANG(
+	no_isis_sr_prefix_algorithm_sid, no_isis_sr_prefix_sid_algorithm_cmd,
+	"no segment-routing prefix <A.B.C.D/M|X:X::X:X/M>$prefix\
+              algorithm (128-255)$algorithm\
+              [<absolute$sid_type (16-1048575)|index (0-65535)> [<no-php-flag|explicit-null>]]\
+              [n-flag-clear]",
+	NO_STR SR_STR
+	"Prefix SID\n"
+	"IPv4 Prefix\n"
+	"IPv6 Prefix\n"
+	"Algorithm Specific Prefix SID Configuration\n"
+	"Algorithm number\n"
+	"Specify the absolute value of Prefix Segment ID\n"
+	"The Prefix Segment ID value\n"
+	"Specify the index of Prefix Segment ID\n"
+	"The Prefix Segment ID index\n"
+	"Don't request Penultimate Hop Popping (PHP)\n"
+	"Upstream neighbor must replace prefix-sid with explicit null label\n"
+	"Not a node SID\n")
+{
+	nb_cli_enqueue_change(vty, ".", NB_OP_DESTROY, NULL);
+
+	return nb_cli_apply_changes(
+		vty,
+		"./segment-routing/algorithm-prefix-sids/algorithm-prefix-sid[prefix='%s'][algo='%s']",
+		prefix_str, algorithm_str);
+	return CMD_SUCCESS;
+}
+#endif /* ifndef FABRICD */
+
+void cli_show_isis_prefix_sid_algorithm(struct vty *vty,
+					const struct lyd_node *dnode,
+					bool show_defaults)
+{
+	const char *prefix;
+	const char *lh_behavior;
+	const char *sid_value_type;
+	const char *sid_value;
+	bool n_flag_clear;
+	uint32_t algorithm;
+
+	prefix = yang_dnode_get_string(dnode, "./prefix");
+	sid_value_type = yang_dnode_get_string(dnode, "./sid-value-type");
+	sid_value = yang_dnode_get_string(dnode, "./sid-value");
+	algorithm = yang_dnode_get_uint32(dnode, "./algo");
+	lh_behavior = yang_dnode_get_string(dnode, "./last-hop-behavior");
+	n_flag_clear = yang_dnode_get_bool(dnode, "./n-flag-clear");
+
+	vty_out(vty, " segment-routing prefix %s", prefix);
+	vty_out(vty, " algorithm %u", algorithm);
+	if (strmatch(sid_value_type, "absolute"))
+		vty_out(vty, " absolute");
+	else
+		vty_out(vty, " index");
+	vty_out(vty, " %s", sid_value);
+
+	if (strmatch(lh_behavior, "no-php"))
+		vty_out(vty, " no-php-flag");
+	else if (strmatch(lh_behavior, "explicit-null"))
+		vty_out(vty, " explicit-null");
+	if (n_flag_clear)
+		vty_out(vty, " n-flag-clear");
+	vty_out(vty, "\n");
+}
 
 /*
  * XPath: /frr-isisd:isis/instance/fast-reroute/level-{1,2}/lfa/priority-limit
@@ -2558,6 +2722,24 @@ void cli_show_ip_isis_circ_type(struct vty *vty, const struct lyd_node *dnode,
 	}
 }
 
+static int ag_change(struct vty *vty, int argc, struct cmd_token **argv,
+		     const char *xpath, bool no, int start_idx)
+{
+	for (int i = start_idx; i < argc; i++)
+		nb_cli_enqueue_change(vty, xpath,
+				      no ? NB_OP_DESTROY : NB_OP_CREATE,
+				      argv[i]->arg);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+static int ag_iter_cb(const struct lyd_node *dnode, void *arg)
+{
+	struct vty *vty = (struct vty *)arg;
+
+	vty_out(vty, " %s", yang_dnode_get_string(dnode, "."));
+	return YANG_ITER_CONTINUE;
+}
+
 /*
  * XPath: /frr-interface:lib/interface/frr-isisd:isis/network-type
  */
@@ -3182,6 +3364,250 @@ void cli_show_isis_mpls_if_ldp_sync_holddown(struct vty *vty,
 		yang_dnode_get_string(dnode, NULL));
 }
 
+DEFPY_YANG_NOSH(flex_algo, flex_algo_cmd, "flex-algo (128-255)$algorithm",
+		"Flexible Algorithm\n"
+		"Flexible Algorithm Number\n")
+{
+	int ret;
+	char xpath[XPATH_MAXLEN + 37];
+
+	snprintf(xpath, sizeof(xpath),
+		 "%s/flex-algos/flex-algo[flex-algo='%ld']", VTY_CURR_XPATH,
+		 algorithm);
+
+	nb_cli_enqueue_change(vty, ".", NB_OP_CREATE, NULL);
+
+	ret = nb_cli_apply_changes(
+		vty, "./flex-algos/flex-algo[flex-algo='%ld']", algorithm);
+	if (ret == CMD_SUCCESS)
+		VTY_PUSH_XPATH(ISIS_FLEX_ALGO_NODE, xpath);
+
+	return ret;
+}
+
+DEFPY_YANG(no_flex_algo, no_flex_algo_cmd, "no flex-algo (128-255)$algorithm",
+	   NO_STR
+	   "Flexible Algorithm\n"
+	   "Flexible Algorithm Number\n")
+{
+	char xpath[XPATH_MAXLEN + 37];
+
+	snprintf(xpath, sizeof(xpath),
+		 "%s/flex-algos/flex-algo[flex-algo='%ld']", VTY_CURR_XPATH,
+		 algorithm);
+
+	if (!yang_dnode_exists(vty->candidate_config->dnode, xpath)) {
+		vty_out(vty, "ISIS flex-algo %ld isn't exist.\n", algorithm);
+		return CMD_ERR_NO_MATCH;
+	}
+
+	nb_cli_enqueue_change(vty, ".", NB_OP_DESTROY, NULL);
+	return nb_cli_apply_changes_clear_pending(
+		vty, "./flex-algos/flex-algo[flex-algo='%ld']", algorithm);
+}
+
+DEFPY_YANG(advertise_definition, advertise_definition_cmd,
+	   "[no] advertise-definition",
+	   NO_STR "Advertise Local Flexible Algorithm\n")
+{
+	nb_cli_enqueue_change(vty, "./advertise-definition",
+			      no ? NB_OP_DESTROY : NB_OP_CREATE,
+			      no ? NULL : "true");
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_YANG(affinity_include_any, affinity_include_any_cmd,
+	   "[no] affinity include-any NAME...",
+	   NO_STR
+	   "Affinity configuration\n"
+	   "Any Include with\n"
+	   "Include NAME list\n")
+{
+	const char *xpath = "./affinity-include-anies/affinity-include-any";
+
+	return ag_change(vty, argc, argv, xpath, no, no ? 3 : 2);
+}
+
+DEFPY_YANG(affinity_include_all, affinity_include_all_cmd,
+	   "[no] affinity include-all NAME...",
+	   NO_STR
+	   "Affinity configuration\n"
+	   "All Include with\n"
+	   "Include NAME list\n")
+{
+	const char *xpath = "./affinity-include-alls/affinity-include-all";
+
+	return ag_change(vty, argc, argv, xpath, no, no ? 3 : 2);
+}
+
+DEFPY_YANG(affinity_exclude_any, affinity_exclude_any_cmd,
+	   "[no] affinity exclude-any NAME...",
+	   NO_STR
+	   "Affinity configuration\n"
+	   "Any Exclude with\n"
+	   "Exclude NAME list\n")
+{
+	const char *xpath = "./affinity-exclude-anies/affinity-exclude-any";
+
+	return ag_change(vty, argc, argv, xpath, no, no ? 3 : 2);
+}
+
+DEFPY_YANG(prefix_metric, prefix_metric_cmd, "[no] prefix-metric",
+	   NO_STR "Use Flex-Algo Prefix Metric\n")
+{
+	nb_cli_enqueue_change(vty, "./prefix-metric",
+			      no ? NB_OP_DESTROY : NB_OP_CREATE, NULL);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_YANG(dplane_sr_mpls, dplane_sr_mpls_cmd, "[no] dataplane sr-mpls",
+	   NO_STR
+	   "Advertise and participate in the specified Data-Planes\n"
+	   "Advertise and participate in SR-MPLS data-plane\n")
+{
+	nb_cli_enqueue_change(vty, "./dplane-sr-mpls",
+			      no ? NB_OP_DESTROY : NB_OP_CREATE, NULL);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_HIDDEN(dplane_srv6, dplane_srv6_cmd, "[no] dataplane srv6",
+	     NO_STR
+	     "Advertise and participate in the specified Data-Planes\n"
+	     "Advertise and participate in SRv6 data-plane\n")
+{
+
+	nb_cli_enqueue_change(vty, "./dplane-srv6",
+			      no ? NB_OP_DESTROY : NB_OP_CREATE, NULL);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_HIDDEN(dplane_ip, dplane_ip_cmd, "[no] dataplane ip",
+	     NO_STR
+	     "Advertise and participate in the specified Data-Planes\n"
+	     "Advertise and participate in IP data-plane\n")
+{
+	nb_cli_enqueue_change(vty, "./dplane-ip",
+			      no ? NB_OP_DESTROY : NB_OP_CREATE, NULL);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_YANG(metric_type, metric_type_cmd,
+	   "[no] metric-type [igp$igp|te$te|delay$delay]",
+	   NO_STR
+	   "Metric-type used by flex-algo calculation\n"
+	   "Use IGP metric (default)\n"
+	   "Use Delay as metric\n"
+	   "Use Traffic Engineering metric\n")
+{
+	const char *type = NULL;
+
+	if (igp) {
+		type = "igp";
+	} else if (te) {
+		type = "te-default";
+	} else if (delay) {
+		type = "min-uni-link-delay";
+	} else {
+		vty_out(vty, "Error: unknown metric type\n");
+		return CMD_SUCCESS;
+	}
+
+	if (!igp)
+		vty_out(vty,
+			"Warning: this version can advertise a Flex-Algorithm Definition (FAD) with the %s metric.\n"
+			"However, participation in a Flex-Algorithm with such a metric is not yet supported.\n",
+			type);
+
+	nb_cli_enqueue_change(vty, "./metric-type",
+			      no ? NB_OP_DESTROY : NB_OP_MODIFY,
+			      no ? NULL : type);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_YANG(priority, priority_cmd, "[no] priority (0-255)$priority",
+	   NO_STR
+	   "Flex-Algo definition priority\n"
+	   "Priority value\n")
+{
+	nb_cli_enqueue_change(vty, "./priority",
+			      no ? NB_OP_DESTROY : NB_OP_MODIFY,
+			      no ? NULL : priority_str);
+	return nb_cli_apply_changes(vty, NULL);
+}
+
+void cli_show_isis_flex_algo(struct vty *vty, const struct lyd_node *dnode,
+			     bool show_defaults)
+{
+	uint32_t algorithm;
+	enum flex_algo_metric_type metric_type;
+	uint32_t priority;
+	char type_str[10];
+
+	algorithm = yang_dnode_get_uint32(dnode, "./flex-algo");
+	vty_out(vty, " flex-algo %u\n", algorithm);
+
+	if (yang_dnode_exists(dnode, "./advertise-definition"))
+		vty_out(vty, "  advertise-definition\n");
+
+	if (yang_dnode_exists(dnode, "./dplane-sr-mpls"))
+		vty_out(vty, "  dataplane sr-mpls\n");
+	if (yang_dnode_exists(dnode, "./dplane-srv6"))
+		vty_out(vty, "  dataplane srv6\n");
+	if (yang_dnode_exists(dnode, "./dplane-ip"))
+		vty_out(vty, "  dataplane ip\n");
+
+	if (yang_dnode_exists(dnode, "./prefix-metric"))
+		vty_out(vty, "  prefix-metric\n");
+
+	if (yang_dnode_exists(dnode, "./metric-type")) {
+		metric_type = yang_dnode_get_enum(dnode, "./metric-type");
+		if (metric_type != MT_IGP) {
+			flex_algo_metric_type_print(type_str, sizeof(type_str),
+						    metric_type);
+			vty_out(vty, "  metric-type %s\n", type_str);
+		}
+	}
+
+	if (yang_dnode_exists(dnode, "./priority")) {
+		priority = yang_dnode_get_uint32(dnode, "./priority");
+		if (priority != FLEX_ALGO_PRIO_DEFAULT)
+			vty_out(vty, "  priority %u\n", priority);
+	}
+
+	if (yang_dnode_exists(dnode,
+			      "./affinity-include-alls/affinity-include-all")) {
+		vty_out(vty, "  affinity include-all");
+		yang_dnode_iterate(
+			ag_iter_cb, vty, dnode,
+			"./affinity-include-alls/affinity-include-all");
+		vty_out(vty, "\n");
+	}
+
+	if (yang_dnode_exists(
+		    dnode, "./affinity-include-anies/affinity-include-any")) {
+		vty_out(vty, "  affinity include-any");
+		yang_dnode_iterate(
+			ag_iter_cb, vty, dnode,
+			"./affinity-include-anies/affinity-include-any");
+		vty_out(vty, "\n");
+	}
+
+	if (yang_dnode_exists(
+		    dnode, "./affinity-exclude-anies/affinity-exclude-any")) {
+		vty_out(vty, "  affinity exclude-any");
+		yang_dnode_iterate(
+			ag_iter_cb, vty, dnode,
+			"./affinity-exclude-anies/affinity-exclude-any");
+		vty_out(vty, "\n");
+	}
+}
+
+void cli_show_isis_flex_algo_end(struct vty *vty, const struct lyd_node *dnode)
+{
+	vty_out(vty, " !\n");
+}
+
+
 void isis_cli_init(void)
 {
 	install_element(CONFIG_NODE, &router_isis_cmd);
@@ -3240,6 +3666,9 @@ void isis_cli_init(void)
 
 	install_element(ISIS_NODE, &area_purge_originator_cmd);
 
+	install_element(ISIS_NODE, &isis_admin_group_send_zero_cmd);
+	install_element(ISIS_NODE, &isis_asla_legacy_flag_cmd);
+
 	install_element(ISIS_NODE, &isis_mpls_te_on_cmd);
 	install_element(ISIS_NODE, &no_isis_mpls_te_on_cmd);
 	install_element(ISIS_NODE, &isis_mpls_te_router_addr_cmd);
@@ -3263,6 +3692,10 @@ void isis_cli_init(void)
 	install_element(ISIS_NODE, &no_isis_sr_node_msd_cmd);
 	install_element(ISIS_NODE, &isis_sr_prefix_sid_cmd);
 	install_element(ISIS_NODE, &no_isis_sr_prefix_sid_cmd);
+#ifndef FABRICD
+	install_element(ISIS_NODE, &isis_sr_prefix_sid_algorithm_cmd);
+	install_element(ISIS_NODE, &no_isis_sr_prefix_sid_algorithm_cmd);
+#endif /* ifndef FABRICD */
 	install_element(ISIS_NODE, &isis_frr_lfa_priority_limit_cmd);
 	install_element(ISIS_NODE, &isis_frr_lfa_tiebreaker_cmd);
 	install_element(ISIS_NODE, &isis_frr_lfa_load_sharing_cmd);
@@ -3319,6 +3752,19 @@ void isis_cli_init(void)
 	install_element(INTERFACE_NODE, &isis_mpls_if_ldp_sync_cmd);
 	install_element(INTERFACE_NODE, &isis_mpls_if_ldp_sync_holddown_cmd);
 	install_element(INTERFACE_NODE, &no_isis_mpls_if_ldp_sync_holddown_cmd);
+
+	install_element(ISIS_NODE, &flex_algo_cmd);
+	install_element(ISIS_NODE, &no_flex_algo_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &advertise_definition_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &affinity_include_any_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &affinity_include_all_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &affinity_exclude_any_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &dplane_sr_mpls_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &dplane_srv6_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &dplane_ip_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &prefix_metric_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &metric_type_cmd);
+	install_element(ISIS_FLEX_ALGO_NODE, &priority_cmd);
 }
 
 #endif /* ifndef FABRICD */

isisd/isis_flex_algo.c

@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * isis_flex_algo.c: IS-IS Flexible Algorithm
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#include <zebra.h>
+
+#include "memory.h"
+#include "stream.h"
+#include "sbuf.h"
+#include "network.h"
+#include "command.h"
+#include "bitfield.h"
+
+#include "isisd/isisd.h"
+#include "isisd/isis_tlvs.h"
+#include "isisd/isis_common.h"
+#include "isisd/isis_mt.h"
+#include "isisd/isis_misc.h"
+#include "isisd/isis_adjacency.h"
+#include "isisd/isis_circuit.h"
+#include "isisd/isis_pdu.h"
+#include "isisd/isis_lsp.h"
+#include "isisd/isis_spf.h"
+#include "isisd/isis_te.h"
+#include "isisd/isis_sr.h"
+#include "isisd/isis_spf_private.h"
+#include "isisd/isis_flex_algo.h"
+
+#ifndef FABRICD
+DEFINE_MTYPE_STATIC(ISISD, FLEX_ALGO, "ISIS Flex Algo");
+
+void *isis_flex_algo_data_alloc(void *voidarg)
+{
+	struct isis_flex_algo_alloc_arg *arg = voidarg;
+	struct isis_flex_algo_data *data;
+
+	data = XCALLOC(MTYPE_FLEX_ALGO, sizeof(*data));
+
+	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
+		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
+			if (!(arg->area->is_type & level))
+				continue;
+			data->spftree[tree][level - 1] = isis_spftree_new(
+				arg->area, &arg->area->lspdb[level - 1],
+				arg->area->isis->sysid, level, tree,
+				SPF_TYPE_FORWARD, 0, arg->algorithm);
+		}
+	}
+
+	return data;
+}
+
+void isis_flex_algo_data_free(void *voiddata)
+{
+	struct isis_flex_algo_data *data = voiddata;
+
+	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++)
+		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++)
+			if (data->spftree[tree][level - 1])
+				isis_spftree_del(
+					data->spftree[tree][level - 1]);
+}
+
+static struct isis_router_cap_fad *
+isis_flex_algo_definition_cmp(struct isis_router_cap_fad *elected,
+			      struct isis_router_cap_fad *fa)
+{
+	if (!elected || fa->fad.priority > elected->fad.priority ||
+	    (fa->fad.priority == elected->fad.priority &&
+	     lsp_id_cmp(fa->sysid, elected->sysid) > 0))
+		return fa;
+
+	return elected;
+}
+
+/**
+ * @brief Look up the flex-algo definition with the highest priority in the LSP
+ * Database (LSDB). If the value of priority is the same, the flex-algo
+ * definition with the highest sysid will be selected.
+ * @param algorithm flex-algo algorithm number
+ * @param area pointer
+ * @param local router capability Flex-Algo Definition (FAD) double pointer.
+ *    - fad is NULL: use the local router capability FAD from LSDB for the
+ *      election.
+ *    - fad is not NULL and *fad is NULL: use no local router capability FAD for
+ *      the election.
+ *    - fad and *fad are not NULL: uses the *fad local definition instead of the
+ *      local definition from LSDB for the election.
+ * @return elected flex-algo-definition object if exist, else NULL
+ */
+static struct isis_router_cap_fad *
+_isis_flex_algo_elected(int algorithm, const struct isis_area *area,
+			struct isis_router_cap_fad **fad)
+{
+	struct flex_algo *flex_ago;
+	const struct isis_lsp *lsp;
+	struct isis_router_cap_fad *fa, *elected = NULL;
+
+	if (!flex_algo_id_valid(algorithm))
+		return NULL;
+
+	/* No elected FAD if the algorithm is not locally configured */
+	flex_ago = flex_algo_lookup(area->flex_algos, algorithm);
+	if (!flex_ago)
+		return NULL;
+
+	/* No elected FAD if no data-plane is enabled
+	 * Currently, only Segment-Routing MPLS is supported.
+	 * Segment-Routing SRv6 and IP will be configured in the future.
+	 */
+	if (!CHECK_FLAG(flex_ago->dataplanes, FLEX_ALGO_SR_MPLS))
+		return NULL;
+
+	/*
+	 * Perform FAD comparison. First, compare the priority, and if they are
+	 * the same, compare the sys-id.
+	 */
+	/* clang-format off */
+	frr_each_const(lspdb, &area->lspdb[ISIS_LEVEL1 - 1], lsp) {
+		/* clang-format on */
+
+		if (!lsp->tlvs || !lsp->tlvs->router_cap)
+			continue;
+
+		if (lsp->own_lsp && fad)
+			continue;
+
+		fa = lsp->tlvs->router_cap->fads[algorithm];
+
+		if (!fa)
+			continue;
+
+		assert(algorithm == fa->fad.algorithm);
+
+		memcpy(fa->sysid, lsp->hdr.lsp_id, ISIS_SYS_ID_LEN + 2);
+
+		elected = isis_flex_algo_definition_cmp(elected, fa);
+	}
+
+	if (fad && *fad)
+		elected = isis_flex_algo_definition_cmp(elected, *fad);
+
+	return elected;
+}
+
+struct isis_router_cap_fad *isis_flex_algo_elected(int algorithm,
+						   const struct isis_area *area)
+{
+	return _isis_flex_algo_elected(algorithm, area, NULL);
+}
+
+/**
+ * @brief Check the Flex-Algo Definition is supported by the current FRR version
+ * @param flex-algo
+ * @return true if supported else false
+ */
+bool isis_flex_algo_supported(struct flex_algo *fad)
+{
+	if (fad->calc_type != CALC_TYPE_SPF)
+		return false;
+	if (fad->metric_type != MT_IGP)
+		return false;
+	if (fad->flags != 0)
+		return false;
+	if (fad->exclude_srlg)
+		return false;
+	if (fad->unsupported_subtlv)
+		return false;
+
+	return true;
+}
+
+/**
+ * @brief Look for the elected Flex-Algo Definition and check that it is
+ * supported by the current FRR version
+ * @param algorithm flex-algo algorithm number
+ * @param area pointer
+ * @param local router capability Flex-Algo Definition (FAD) double pointer.
+ * @return elected flex-algo-definition object if exist and supported, else NULL
+ */
+static struct isis_router_cap_fad *
+_isis_flex_algo_elected_supported(int algorithm, const struct isis_area *area,
+				  struct isis_router_cap_fad **fad)
+{
+	struct isis_router_cap_fad *elected_fad;
+
+	elected_fad = _isis_flex_algo_elected(algorithm, area, fad);
+	if (!elected_fad)
+		return NULL;
+
+	if (isis_flex_algo_supported(&elected_fad->fad))
+		return elected_fad;
+
+	return NULL;
+}
+
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported(int algorithm, const struct isis_area *area)
+{
+	return _isis_flex_algo_elected_supported(algorithm, area, NULL);
+}
+
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported_local_fad(int algorithm,
+					   const struct isis_area *area,
+					   struct isis_router_cap_fad **fad)
+{
+	return _isis_flex_algo_elected_supported(algorithm, area, fad);
+}
+
+/**
+ * Check LSP is participating specified SR Algorithm
+ *
+ * @param lsp        IS-IS lsp
+ * @param algorithm  SR Algorithm
+ * @return           Return true if sr-algorithm tlv includes specified
+ *                   algorithm in router capability tlv
+ */
+bool sr_algorithm_participated(const struct isis_lsp *lsp, uint8_t algorithm)
+{
+	if (!lsp || !lsp->tlvs || !lsp->tlvs->router_cap)
+		return false;
+	for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
+		if (lsp->tlvs->router_cap->algo[i] == algorithm)
+			return true;
+	return false;
+}
+
+bool isis_flex_algo_constraint_drop(struct isis_spftree *spftree,
+				    struct isis_lsp *lsp,
+				    struct isis_extended_reach *reach)
+{
+	bool ret;
+	struct isis_ext_subtlvs *subtlvs = reach->subtlvs;
+	uint8_t lspid_orig[ISIS_SYS_ID_LEN + 2];
+	uint8_t lspid_neigh[ISIS_SYS_ID_LEN + 2];
+	struct isis_router_cap_fad *fad;
+	struct isis_asla_subtlvs *asla;
+	struct listnode *node;
+	uint32_t *link_admin_group = NULL;
+	uint32_t link_ext_admin_group_bitmap0;
+	struct admin_group *link_ext_admin_group = NULL;
+
+	fad = isis_flex_algo_elected_supported(spftree->algorithm,
+					       spftree->area);
+	if (!fad)
+		return true;
+
+	for (ALL_LIST_ELEMENTS_RO(subtlvs->aslas, node, asla)) {
+		if (!CHECK_FLAG(asla->standard_apps, ISIS_SABM_FLAG_X))
+			continue;
+		if (asla->legacy) {
+			if (IS_SUBTLV(subtlvs, EXT_ADM_GRP))
+				link_admin_group = &subtlvs->adm_group;
+
+			if (IS_SUBTLV(subtlvs, EXT_EXTEND_ADM_GRP) &&
+			    admin_group_nb_words(&subtlvs->ext_admin_group) !=
+				    0)
+				link_ext_admin_group =
+					&subtlvs->ext_admin_group;
+		} else {
+			if (IS_SUBTLV(asla, EXT_ADM_GRP))
+				link_admin_group = &asla->admin_group;
+			if (IS_SUBTLV(asla, EXT_EXTEND_ADM_GRP) &&
+			    admin_group_nb_words(&asla->ext_admin_group) != 0)
+				link_ext_admin_group = &asla->ext_admin_group;
+		}
+		break;
+	}
+
+	/* RFC7308 section 2.3.1
+	 * A receiving node that notices that the AG differs from the first 32
+	 * bits of the EAG SHOULD report this mismatch to the operator.
+	 */
+	if (link_admin_group && link_ext_admin_group) {
+		link_ext_admin_group_bitmap0 =
+			admin_group_get_offset(link_ext_admin_group, 0);
+		if (*link_admin_group != link_ext_admin_group_bitmap0) {
+			memcpy(lspid_orig, lsp->hdr.lsp_id,
+			       ISIS_SYS_ID_LEN + 2);
+			memcpy(lspid_neigh, reach->id, ISIS_SYS_ID_LEN + 2);
+			zlog_warn(
+				"ISIS-SPF: LSP from %pLS neighbor %pLS. Admin-group 0x%08x differs from ext admin-group 0x%08x.",
+				lspid_orig, lspid_neigh, *link_admin_group,
+				link_ext_admin_group_bitmap0);
+		}
+	}
+
+	/*
+	 * Exclude Any
+	 */
+	if (!admin_group_zero(&fad->fad.admin_group_exclude_any)) {
+		ret = admin_group_match_any(&fad->fad.admin_group_exclude_any,
+					    link_admin_group,
+					    link_ext_admin_group);
+		if (ret)
+			return true;
+	}
+
+	/*
+	 * Include Any
+	 */
+	if (!admin_group_zero(&fad->fad.admin_group_include_any)) {
+		ret = admin_group_match_any(&fad->fad.admin_group_include_any,
+					    link_admin_group,
+					    link_ext_admin_group);
+		if (!ret)
+			return true;
+	}
+
+	/*
+	 * Include All
+	 */
+	if (!admin_group_zero(&fad->fad.admin_group_include_all)) {
+		ret = admin_group_match_all(&fad->fad.admin_group_include_all,
+					    link_admin_group,
+					    link_ext_admin_group);
+		if (!ret)
+			return true;
+	}
+
+	return false;
+}
+
+#endif /* ifndef FABRICD */

isisd/isis_flex_algo.h

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * isis_flex_algo.h: IS-IS Flexible Algorithm
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#ifndef ISIS_FLEX_ALGO_H
+#define ISIS_FLEX_ALGO_H
+
+#include "flex_algo.h"
+#include "isisd/isis_constants.h"
+
+#ifndef FABRICD
+
+struct isis_flex_algo_data {
+	struct isis_spftree *spftree[SPFTREE_COUNT][ISIS_LEVELS];
+	struct isis_area *area;
+};
+
+struct isis_flex_algo_alloc_arg {
+	uint8_t algorithm;
+	struct isis_area *area;
+};
+
+void *isis_flex_algo_data_alloc(void *arg);
+void isis_flex_algo_data_free(void *data);
+
+struct isis_router_cap_fad *
+isis_flex_algo_elected(int algorithm, const struct isis_area *area);
+bool isis_flex_algo_supported(struct flex_algo *fad);
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported(int algorithm, const struct isis_area *area);
+struct isis_router_cap_fad *
+isis_flex_algo_elected_supported_local_fad(int algorithm,
+					   const struct isis_area *area,
+					   struct isis_router_cap_fad **fad);
+struct isis_lsp;
+bool sr_algorithm_participated(const struct isis_lsp *lsp, uint8_t algorithm);
+
+bool isis_flex_algo_constraint_drop(struct isis_spftree *spftree,
+				    struct isis_lsp *lsp,
+				    struct isis_extended_reach *reach);
+
+#endif /* ifndef FABRICD */
+
+#endif /* ISIS_FLEX_ALGO_H */

isisd/isis_lfa.c

@@ -355,6 +355,7 @@ bool isis_lfa_excise_node_check(const struct isis_spftree *spftree,
 
 struct tilfa_find_pnode_prefix_sid_args {
 	uint32_t sid_index;
+	int algorithm;
 };
 
 static int tilfa_find_pnode_prefix_sid_cb(const struct prefix *prefix,
@@ -368,15 +369,17 @@ static int tilfa_find_pnode_prefix_sid_cb(const struct prefix *prefix,
 	if (!subtlvs || subtlvs->prefix_sids.count == 0)
 		return LSP_ITER_CONTINUE;
 
-	psid = (struct isis_prefix_sid *)subtlvs->prefix_sids.head;
-
-	/* Require the node flag to be set. */
-	if (!CHECK_FLAG(psid->flags, ISIS_PREFIX_SID_NODE))
-		return LSP_ITER_CONTINUE;
-
-	args->sid_index = psid->value;
-
-	return LSP_ITER_STOP;
+	for (psid = (struct isis_prefix_sid *)subtlvs->prefix_sids.head; psid;
+	     psid = psid->next) {
+		/* Require the node flag to be set. */
+		if (!CHECK_FLAG(psid->flags, ISIS_PREFIX_SID_NODE))
+			continue;
+		if (psid->algorithm != args->algorithm)
+			continue;
+		args->sid_index = psid->value;
+		return LSP_ITER_STOP;
+	}
+	return LSP_ITER_CONTINUE;
 }
 
 /* Find Prefix-SID associated to a System ID. */
@@ -390,6 +393,8 @@ static uint32_t tilfa_find_pnode_prefix_sid(struct isis_spftree *spftree,
 	if (!lsp)
 		return UINT32_MAX;
 
+	args.algorithm = spftree->algorithm;
+
 	args.sid_index = UINT32_MAX;
 	isis_lsp_iterate_ip_reach(lsp, spftree->family, spftree->mtid,
 				  tilfa_find_pnode_prefix_sid_cb, &args);
@@ -1098,7 +1103,8 @@ struct isis_spftree *isis_spf_reverse_run(const struct isis_spftree *spftree)
 	spftree_reverse = isis_spftree_new(
 		spftree->area, spftree->lspdb, spftree->sysid, spftree->level,
 		spftree->tree_id, SPF_TYPE_REVERSE,
-		F_SPFTREE_NO_ADJACENCIES | F_SPFTREE_NO_ROUTES);
+		F_SPFTREE_NO_ADJACENCIES | F_SPFTREE_NO_ROUTES,
+		spftree->algorithm);
 	isis_run_spf(spftree_reverse);
 
 	return spftree_reverse;
@@ -1194,7 +1200,8 @@ struct isis_spftree *isis_tilfa_compute(struct isis_area *area,
 	/* Create post-convergence SPF tree. */
 	spftree_pc = isis_spftree_new(area, spftree->lspdb, spftree->sysid,
 				      spftree->level, spftree->tree_id,
-				      SPF_TYPE_TI_LFA, spftree->flags);
+				      SPF_TYPE_TI_LFA, spftree->flags,
+				      spftree->algorithm);
 	spftree_pc->lfa.old.spftree = spftree;
 	spftree_pc->lfa.old.spftree_reverse = spftree_reverse;
 	spftree_pc->lfa.protected_resource = *resource;
@@ -1242,7 +1249,8 @@ int isis_spf_run_neighbors(struct isis_spftree *spftree)
 		adj_node->lfa.spftree = isis_spftree_new(
 			spftree->area, spftree->lspdb, adj_node->sysid,
 			spftree->level, spftree->tree_id, SPF_TYPE_FORWARD,
-			F_SPFTREE_NO_ADJACENCIES | F_SPFTREE_NO_ROUTES);
+			F_SPFTREE_NO_ADJACENCIES | F_SPFTREE_NO_ROUTES,
+			spftree->algorithm);
 		isis_run_spf(adj_node->lfa.spftree);
 	}
 
@@ -1722,7 +1730,8 @@ struct isis_spftree *isis_rlfa_compute(struct isis_area *area,
 	/* Create post-convergence SPF tree. */
 	spftree_pc = isis_spftree_new(area, spftree->lspdb, spftree->sysid,
 				      spftree->level, spftree->tree_id,
-				      SPF_TYPE_RLFA, spftree->flags);
+				      SPF_TYPE_RLFA, spftree->flags,
+				      spftree->algorithm);
 	spftree_pc->lfa.old.spftree = spftree;
 	spftree_pc->lfa.old.spftree_reverse = spftree_reverse;
 	spftree_pc->lfa.remote.max_metric = max_metric;

isisd/isis_lsp.c

@@ -46,6 +46,7 @@
 #include "isisd/fabricd.h"
 #include "isisd/isis_tx_queue.h"
 #include "isisd/isis_nb.h"
+#include "isisd/isis_flex_algo.h"
 
 DEFINE_MTYPE_STATIC(ISISD, ISIS_LSP, "ISIS LSP");
 
@@ -879,6 +880,65 @@ static uint16_t lsp_refresh_time(struct isis_lsp *lsp, uint16_t rem_lifetime)
 	return refresh_time;
 }
 
+static void lsp_build_internal_reach_ipv4(struct isis_lsp *lsp,
+					  struct isis_area *area,
+					  struct prefix_ipv4 *ipv4,
+					  uint32_t metric)
+{
+	struct sr_prefix_cfg *pcfgs[SR_ALGORITHM_COUNT] = {NULL};
+
+	if (area->oldmetric) {
+		lsp_debug(
+			"ISIS (%s): Adding old-style IP reachability for %pFX",
+			area->area_tag, ipv4);
+		isis_tlvs_add_oldstyle_ip_reach(lsp->tlvs, ipv4, metric);
+	}
+
+	if (area->newmetric) {
+		lsp_debug("ISIS (%s): Adding te-style IP reachability for %pFX",
+			  area->area_tag, ipv4);
+
+		if (area->srdb.enabled)
+			for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+#ifndef FABRICD
+				if (flex_algo_id_valid(i) &&
+				    !isis_flex_algo_elected_supported(i, area))
+					continue;
+#endif /* ifndef FABRICD */
+				pcfgs[i] =
+					isis_sr_cfg_prefix_find(area, ipv4, i);
+			}
+
+		isis_tlvs_add_extended_ip_reach(lsp->tlvs, ipv4, metric, false,
+						pcfgs);
+	}
+}
+
+static void lsp_build_internal_reach_ipv6(struct isis_lsp *lsp,
+					  struct isis_area *area,
+					  struct prefix_ipv6 *ipv6,
+					  uint32_t metric)
+{
+	struct sr_prefix_cfg *pcfgs[SR_ALGORITHM_COUNT] = {NULL};
+
+	lsp_debug("ISIS (%s): Adding IPv6 reachability for %pFX",
+		  area->area_tag, ipv6);
+
+	if (area->srdb.enabled)
+		for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+#ifndef FABRICD
+			if (flex_algo_id_valid(i) &&
+			    !isis_flex_algo_elected_supported(i, area))
+				continue;
+#endif /* ifndef FABRICD */
+			pcfgs[i] = isis_sr_cfg_prefix_find(area, ipv6, i);
+		}
+
+	isis_tlvs_add_ipv6_reach(lsp->tlvs, isis_area_ipv6_topology(area), ipv6,
+				 metric, false, pcfgs);
+}
+
+
 static void lsp_build_ext_reach_ipv4(struct isis_lsp *lsp,
 				     struct isis_area *area)
 {
@@ -904,13 +964,23 @@ static void lsp_build_ext_reach_ipv4(struct isis_lsp *lsp,
 			isis_tlvs_add_oldstyle_ip_reach(lsp->tlvs, ipv4,
 							metric);
 		if (area->newmetric) {
-			struct sr_prefix_cfg *pcfg = NULL;
+			struct sr_prefix_cfg *pcfgs[SR_ALGORITHM_COUNT] = {
+				NULL};
 
 			if (area->srdb.enabled)
-				pcfg = isis_sr_cfg_prefix_find(area, ipv4);
+				for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+#ifndef FABRICD
+					if (flex_algo_id_valid(i) &&
+					    !isis_flex_algo_elected_supported(
+						    i, area))
+						continue;
+#endif /* ifndef FABRICD */
+					pcfgs[i] = isis_sr_cfg_prefix_find(
+						area, ipv4, i);
+				}
 
 			isis_tlvs_add_extended_ip_reach(lsp->tlvs, ipv4, metric,
-							true, pcfg);
+							true, pcfgs);
 		}
 	}
 }
@@ -938,14 +1008,24 @@ static void lsp_build_ext_reach_ipv6(struct isis_lsp *lsp,
 			metric = MAX_WIDE_PATH_METRIC;
 
 		if (!src_p || !src_p->prefixlen) {
-			struct sr_prefix_cfg *pcfg = NULL;
+			struct sr_prefix_cfg *pcfgs[SR_ALGORITHM_COUNT] = {
+				NULL};
 
 			if (area->srdb.enabled)
-				pcfg = isis_sr_cfg_prefix_find(area, p);
+				for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+#ifndef FABRICD
+					if (flex_algo_id_valid(i) &&
+					    !isis_flex_algo_elected_supported(
+						    i, area))
+						continue;
+#endif /* ifndef FABRICD */
+					pcfgs[i] = isis_sr_cfg_prefix_find(
+						area, p, i);
+				}
 
 			isis_tlvs_add_ipv6_reach(lsp->tlvs,
 						 isis_area_ipv6_topology(area),
-						 p, metric, true, pcfg);
+						 p, metric, true, pcfgs);
 		} else if (isis_area_ipv6_dstsrc_enabled(area)) {
 			isis_tlvs_add_ipv6_dstsrc_reach(lsp->tlvs,
 							ISIS_MT_IPV6_DSTSRC,
@@ -1062,9 +1142,30 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 
 	/* Add Router Capability TLV. */
 	if (area->isis->router_id != 0) {
-		struct isis_router_cap cap = {};
+		struct isis_router_cap *rcap;
+#ifndef FABRICD
+		struct isis_router_cap_fad *rcap_fad;
+		struct listnode *node;
+		struct flex_algo *fa;
+#endif /* ifndef FABRICD */
 
-		cap.router_id.s_addr = area->isis->router_id;
+		rcap = isis_tlvs_init_router_capability(lsp->tlvs);
+
+		rcap->router_id.s_addr = area->isis->router_id;
+
+#ifndef FABRICD
+		/* Set flex-algo definitions */
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, node,
+					  fa)) {
+			if (!fa->advertise_definition)
+				continue;
+			lsp_debug("ISIS (%s):   Flex-Algo Definition %u",
+				  area->area_tag, fa->algorithm);
+			isis_tlvs_set_router_capability_fad(lsp->tlvs, fa,
+							    fa->algorithm,
+							    area->isis->sysid);
+		}
+#endif /* ifndef FABRICD */
 
 		/* Add SR Sub-TLVs if SR is enabled. */
 		if (area->srdb.enabled) {
@@ -1074,30 +1175,38 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 			/* SRGB first */
 			range_size = srdb->config.srgb_upper_bound
 				     - srdb->config.srgb_lower_bound + 1;
-			cap.srgb.flags = ISIS_SUBTLV_SRGB_FLAG_I
-					 | ISIS_SUBTLV_SRGB_FLAG_V;
-			cap.srgb.range_size = range_size;
-			cap.srgb.lower_bound = srdb->config.srgb_lower_bound;
+			rcap->srgb.flags = ISIS_SUBTLV_SRGB_FLAG_I |
+					   ISIS_SUBTLV_SRGB_FLAG_V;
+			rcap->srgb.range_size = range_size;
+			rcap->srgb.lower_bound = srdb->config.srgb_lower_bound;
 			/* Then Algorithm */
-			cap.algo[0] = SR_ALGORITHM_SPF;
-			cap.algo[1] = SR_ALGORITHM_UNSET;
+			rcap->algo[0] = SR_ALGORITHM_SPF;
+			rcap->algo[1] = SR_ALGORITHM_UNSET;
+#ifndef FABRICD
+			for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos,
+						  node, fa)) {
+				if (fa->advertise_definition)
+					rcap_fad = rcap->fads[fa->algorithm];
+				else
+					rcap_fad = NULL;
+
+				if (!isis_flex_algo_elected_supported_local_fad(
+					    fa->algorithm, area, &rcap_fad))
+					continue;
+				lsp_debug("ISIS (%s):   SR Algorithm %u",
+					  area->area_tag, fa->algorithm);
+				rcap->algo[fa->algorithm] = fa->algorithm;
+			}
+#endif /* ifndef FABRICD */
 			/* SRLB */
-			cap.srlb.flags = 0;
+			rcap->srlb.flags = 0;
 			range_size = srdb->config.srlb_upper_bound
 				     - srdb->config.srlb_lower_bound + 1;
-			cap.srlb.range_size = range_size;
-			cap.srlb.lower_bound = srdb->config.srlb_lower_bound;
+			rcap->srlb.range_size = range_size;
+			rcap->srlb.lower_bound = srdb->config.srlb_lower_bound;
 			/* And finally MSD */
-			cap.msd = srdb->config.msd;
-		} else {
-			/* Disable SR Algorithm */
-			cap.algo[0] = SR_ALGORITHM_UNSET;
-			cap.algo[1] = SR_ALGORITHM_UNSET;
+			rcap->msd = srdb->config.msd;
 		}
-
-		isis_tlvs_set_router_capability(lsp->tlvs, &cap);
-		lsp_debug("ISIS (%s): Adding Router Capabilities information",
-			  area->area_tag);
 	}
 
 	/* IPv4 address and TE router ID TLVs.
@@ -1187,31 +1296,9 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 			struct listnode *ipnode;
 			struct prefix_ipv4 *ipv4;
 			for (ALL_LIST_ELEMENTS_RO(circuit->ip_addrs, ipnode,
-						  ipv4)) {
-				if (area->oldmetric) {
-					lsp_debug(
-						"ISIS (%s): Adding old-style IP reachability for %pFX",
-						area->area_tag, ipv4);
-					isis_tlvs_add_oldstyle_ip_reach(
-						lsp->tlvs, ipv4, metric);
-				}
-
-				if (area->newmetric) {
-					struct sr_prefix_cfg *pcfg = NULL;
-
-					lsp_debug(
-						"ISIS (%s): Adding te-style IP reachability for %pFX",
-						area->area_tag, ipv4);
-
-					if (area->srdb.enabled)
-						pcfg = isis_sr_cfg_prefix_find(
-							area, ipv4);
-
-					isis_tlvs_add_extended_ip_reach(
-						lsp->tlvs, ipv4, metric, false,
-						pcfg);
-				}
-			}
+						  ipv4))
+				lsp_build_internal_reach_ipv4(lsp, area, ipv4,
+							      metric);
 		}
 
 		if (circuit->ipv6_router && circuit->ipv6_non_link->count > 0) {
@@ -1219,22 +1306,9 @@ static void lsp_build(struct isis_lsp *lsp, struct isis_area *area)
 			struct prefix_ipv6 *ipv6;
 
 			for (ALL_LIST_ELEMENTS_RO(circuit->ipv6_non_link,
-						  ipnode, ipv6)) {
-				struct sr_prefix_cfg *pcfg = NULL;
-
-				lsp_debug(
-					"ISIS (%s): Adding IPv6 reachability for %pFX",
-					area->area_tag, ipv6);
-
-				if (area->srdb.enabled)
-					pcfg = isis_sr_cfg_prefix_find(area,
-								       ipv6);
-
-				isis_tlvs_add_ipv6_reach(
-					lsp->tlvs,
-					isis_area_ipv6_topology(area), ipv6,
-					metric, false, pcfg);
-			}
+						  ipnode, ipv6))
+				lsp_build_internal_reach_ipv6(lsp, area, ipv6,
+							      metric);
 		}
 
 		switch (circuit->circ_type) {

isisd/isis_main.c

@@ -29,6 +29,7 @@
 #include "routemap.h"
 #include "affinitymap.h"
 
+#include "isisd/isis_affinitymap.h"
 #include "isisd/isis_constants.h"
 #include "isisd/isis_common.h"
 #include "isisd/isis_flags.h"
@@ -281,7 +282,7 @@ int main(int argc, char **argv, char **envp)
 #endif /* FABRICD */
 #ifndef FABRICD
 	isis_cli_init();
-#endif /* ifdef FABRICD */
+#endif /* ifndef FABRICD */
 	isis_spf_init();
 	isis_redist_init();
 	isis_route_map_init();
@@ -290,7 +291,9 @@ int main(int argc, char **argv, char **envp)
 	lsp_init();
 	mt_init();
 
-	affinity_map_init();
+#ifndef FABRICD
+	isis_affinity_map_init();
+#endif /* ifndef FABRICD */
 
 	isis_zebra_init(master, instance);
 	isis_bfd_init(master);

isisd/isis_nb.c

@@ -102,6 +102,20 @@ const struct frr_yang_module_info frr_isisd_info = {
 				.modify = isis_instance_purge_originator_modify,
 			},
 		},
+		{
+			.xpath = "/frr-isisd:isis/instance/admin-group-send-zero",
+			.cbs = {
+				.cli_show = cli_show_isis_admin_group_send_zero,
+				.modify = isis_instance_admin_group_send_zero_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/asla-legacy-flag",
+			.cbs = {
+				.cli_show = cli_show_isis_asla_legacy_flag,
+				.modify = isis_instance_asla_legacy_flag_modify,
+			},
+		},
 		{
 			.xpath = "/frr-isisd:isis/instance/lsp/mtu",
 			.cbs = {
@@ -688,6 +702,118 @@ const struct frr_yang_module_info frr_isisd_info = {
 				.modify = isis_instance_segment_routing_prefix_sid_map_prefix_sid_n_flag_clear_modify,
 			}
 		},
+		{
+			.xpath = "/frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid",
+			.cbs = {
+				.create = isis_instance_segment_routing_algorithm_prefix_sid_create,
+				.destroy = isis_instance_segment_routing_algorithm_prefix_sid_destroy,
+				.pre_validate = isis_instance_segment_routing_algorithm_prefix_sid_pre_validate,
+				.apply_finish = isis_instance_segment_routing_algorithm_prefix_sid_apply_finish,
+				.cli_show = cli_show_isis_prefix_sid_algorithm,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/sid-value-type",
+			.cbs = {
+				.modify = isis_instance_segment_routing_algorithm_prefix_sid_sid_value_type_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/sid-value",
+			.cbs = {
+				.modify = isis_instance_segment_routing_algorithm_prefix_sid_sid_value_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/last-hop-behavior",
+			.cbs = {
+				.modify = isis_instance_segment_routing_algorithm_prefix_sid_last_hop_behavior_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/n-flag-clear",
+			.cbs = {
+				.modify = isis_instance_segment_routing_algorithm_prefix_sid_n_flag_clear_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo",
+			.cbs = {
+				.cli_show = cli_show_isis_flex_algo,
+				.cli_show_end = cli_show_isis_flex_algo_end,
+				.create = isis_instance_flex_algo_create,
+				.destroy = isis_instance_flex_algo_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/advertise-definition",
+			.cbs = {
+				.modify = isis_instance_flex_algo_advertise_definition_modify,
+				.destroy = isis_instance_flex_algo_advertise_definition_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/affinity-include-alls/affinity-include-all",
+			.cbs = {
+				.create = isis_instance_flex_algo_affinity_include_all_create,
+				.destroy = isis_instance_flex_algo_affinity_include_all_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/affinity-include-anies/affinity-include-any",
+			.cbs = {
+				.create = isis_instance_flex_algo_affinity_include_any_create,
+				.destroy = isis_instance_flex_algo_affinity_include_any_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/affinity-exclude-anies/affinity-exclude-any",
+			.cbs = {
+				.create = isis_instance_flex_algo_affinity_exclude_any_create,
+				.destroy = isis_instance_flex_algo_affinity_exclude_any_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/prefix-metric",
+			.cbs = {
+				.create = isis_instance_flex_algo_prefix_metric_create,
+				.destroy = isis_instance_flex_algo_prefix_metric_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/metric-type",
+			.cbs = {
+				.modify = isis_instance_flex_algo_metric_type_modify,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/dplane-sr-mpls",
+			.cbs = {
+				.create = isis_instance_flex_algo_dplane_sr_mpls_create,
+				.destroy = isis_instance_flex_algo_dplane_sr_mpls_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/dplane-srv6",
+			.cbs = {
+				.create = isis_instance_flex_algo_dplane_srv6_create,
+				.destroy = isis_instance_flex_algo_dplane_srv6_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/dplane-ip",
+			.cbs = {
+				.create = isis_instance_flex_algo_dplane_ip_create,
+				.destroy = isis_instance_flex_algo_dplane_ip_destroy,
+			},
+		},
+		{
+			.xpath = "/frr-isisd:isis/instance/flex-algos/flex-algo/priority",
+			.cbs = {
+				.modify = isis_instance_flex_algo_priority_modify,
+				.destroy = isis_instance_flex_algo_priority_destroy,
+			},
+		},
 		{
 			.xpath = "/frr-isisd:isis/instance/mpls/ldp-sync",
 			.cbs = {

isisd/isis_nb.h

@@ -29,6 +29,8 @@ int isis_instance_overload_on_startup_modify(struct nb_cb_modify_args *args);
 int isis_instance_advertise_high_metrics_modify(struct nb_cb_modify_args *args);
 int isis_instance_metric_style_modify(struct nb_cb_modify_args *args);
 int isis_instance_purge_originator_modify(struct nb_cb_modify_args *args);
+int isis_instance_admin_group_send_zero_modify(struct nb_cb_modify_args *args);
+int isis_instance_asla_legacy_flag_modify(struct nb_cb_modify_args *args);
 int isis_instance_lsp_mtu_modify(struct nb_cb_modify_args *args);
 int isis_instance_advertise_passive_only_modify(struct nb_cb_modify_args *args);
 int isis_instance_lsp_refresh_interval_level_1_modify(
@@ -249,6 +251,67 @@ int isis_instance_segment_routing_prefix_sid_map_prefix_sid_last_hop_behavior_mo
 	struct nb_cb_modify_args *args);
 int isis_instance_segment_routing_prefix_sid_map_prefix_sid_n_flag_clear_modify(
 	struct nb_cb_modify_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_create(
+	struct nb_cb_create_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_pre_validate(
+	struct nb_cb_pre_validate_args *args);
+void isis_instance_segment_routing_algorithm_prefix_sid_apply_finish(
+	struct nb_cb_apply_finish_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_sid_value_type_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_sid_value_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_last_hop_behavior_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_segment_routing_algorithm_prefix_sid_n_flag_clear_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_create(struct nb_cb_create_args *args);
+int isis_instance_flex_algo_destroy(struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_advertise_definition_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_advertise_definition_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_affinity_include_any_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_affinity_include_any_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_affinity_include_all_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_affinity_include_all_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_affinity_exclude_any_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_affinity_exclude_any_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_prefix_metric_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_prefix_metric_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_dplane_sr_mpls_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_dplane_sr_mpls_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_dplane_srv6_create(struct nb_cb_create_args *args);
+int isis_instance_flex_algo_dplane_srv6_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_dplane_ip_create(struct nb_cb_create_args *args);
+int isis_instance_flex_algo_dplane_ip_destroy(struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_metric_type_modify(struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_priority_modify(struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_priority_destroy(struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_frr_disable_modify(struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_frr_disable_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_affinity_mapping_create(
+	struct nb_cb_create_args *args);
+int isis_instance_flex_algo_affinity_mapping_destroy(
+	struct nb_cb_destroy_args *args);
+int isis_instance_flex_algo_affinity_mapping_value_modify(
+	struct nb_cb_modify_args *args);
+int isis_instance_flex_algo_affinity_mapping_value_destroy(
+	struct nb_cb_destroy_args *args);
 int isis_instance_mpls_ldp_sync_destroy(struct nb_cb_destroy_args *args);
 int isis_instance_mpls_ldp_sync_create(struct nb_cb_create_args *args);
 int isis_instance_mpls_ldp_sync_holddown_modify(struct nb_cb_modify_args *args);
@@ -495,6 +558,12 @@ void cli_show_isis_purge_origin(struct vty *vty, const struct lyd_node *dnode,
 				bool show_defaults);
 void cli_show_isis_mpls_te(struct vty *vty, const struct lyd_node *dnode,
 			   bool show_defaults);
+void cli_show_isis_admin_group_send_zero(struct vty *vty,
+					 const struct lyd_node *dnode,
+					 bool show_defaults);
+void cli_show_isis_asla_legacy_flag(struct vty *vty,
+				    const struct lyd_node *dnode,
+				    bool show_defaults);
 void cli_show_isis_mpls_te_router_addr(struct vty *vty,
 				       const struct lyd_node *dnode,
 				       bool show_defaults);
@@ -538,6 +607,9 @@ void cli_show_isis_node_msd(struct vty *vty, const struct lyd_node *dnode,
 			    bool show_defaults);
 void cli_show_isis_prefix_sid(struct vty *vty, const struct lyd_node *dnode,
 			      bool show_defaults);
+void cli_show_isis_prefix_sid_algorithm(struct vty *vty,
+					const struct lyd_node *dnode,
+					bool show_defaults);
 void cli_show_isis_frr_lfa_priority_limit(struct vty *vty,
 					  const struct lyd_node *dnode,
 					  bool show_defaults);
@@ -623,6 +695,9 @@ void cli_show_isis_mpls_if_ldp_sync(struct vty *vty,
 void cli_show_isis_mpls_if_ldp_sync_holddown(struct vty *vty,
 					     const struct lyd_node *dnode,
 					     bool show_defaults);
+void cli_show_isis_flex_algo(struct vty *vty, const struct lyd_node *dnode,
+			     bool show_defaults);
+void cli_show_isis_flex_algo_end(struct vty *vty, const struct lyd_node *dnode);
 
 /* Notifications. */
 void isis_notif_db_overload(const struct isis_area *area, bool overload);

isisd/isis_nb_config.c

@@ -21,6 +21,7 @@
 #include "vrf.h"
 #include "ldp_sync.h"
 #include "link_state.h"
+#include "affinitymap.h"
 
 #include "isisd/isisd.h"
 #include "isisd/isis_nb.h"
@@ -39,8 +40,14 @@
 #include "isisd/isis_redist.h"
 #include "isisd/isis_ldp_sync.h"
 #include "isisd/isis_dr.h"
+#include "isisd/isis_sr.h"
+#include "isisd/isis_flex_algo.h"
 #include "isisd/isis_zebra.h"
 
+#define AFFINITY_INCLUDE_ANY 0
+#define AFFINITY_INCLUDE_ALL 1
+#define AFFINITY_EXCLUDE_ANY 2
+
 /*
  * XPath: /frr-isisd:isis/instance
  */
@@ -416,6 +423,71 @@ int isis_instance_purge_originator_modify(struct nb_cb_modify_args *args)
 	return NB_OK;
 }
 
+
+/*
+ * XPath: /frr-isisd:isis/instance/admin-group-send-zero
+ */
+int isis_instance_admin_group_send_zero_modify(struct nb_cb_modify_args *args)
+{
+	struct isis_circuit *circuit;
+	struct isis_area *area;
+	struct listnode *node;
+	struct flex_algo *fa;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	area = nb_running_get_entry(args->dnode, NULL, true);
+	area->admin_group_send_zero = yang_dnode_get_bool(args->dnode, NULL);
+
+	if (area->admin_group_send_zero) {
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, node,
+					  fa)) {
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_exclude_any);
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_include_any);
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_include_all);
+		}
+	} else {
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, node,
+					  fa)) {
+			admin_group_disallow_explicit_zero(
+				&fa->admin_group_exclude_any);
+			admin_group_disallow_explicit_zero(
+				&fa->admin_group_include_any);
+			admin_group_disallow_explicit_zero(
+				&fa->admin_group_include_all);
+		}
+	}
+
+	for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit))
+		isis_link_params_update(circuit, circuit->interface);
+
+	lsp_regenerate_schedule(area, IS_LEVEL_1 | IS_LEVEL_2, 0);
+
+	return NB_OK;
+}
+
+
+/*
+ * XPath: /frr-isisd:isis/instance/asla-legacy-flag
+ */
+int isis_instance_asla_legacy_flag_modify(struct nb_cb_modify_args *args)
+{
+	struct isis_area *area;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	area = nb_running_get_entry(args->dnode, NULL, true);
+	area->asla_legacy_flag = yang_dnode_get_bool(args->dnode, NULL);
+	lsp_regenerate_schedule(area, IS_LEVEL_1 | IS_LEVEL_2, 0);
+
+	return NB_OK;
+}
+
 /*
  * XPath: /frr-isisd:isis/instance/lsp/mtu
  */
@@ -2276,7 +2348,7 @@ int isis_instance_segment_routing_prefix_sid_map_prefix_sid_create(
 	area = nb_running_get_entry(args->dnode, NULL, true);
 	yang_dnode_get_prefix(&prefix, args->dnode, "./prefix");
 
-	pcfg = isis_sr_cfg_prefix_add(area, &prefix);
+	pcfg = isis_sr_cfg_prefix_add(area, &prefix, SR_ALGORITHM_SPF);
 	nb_running_set_entry(args->dnode, pcfg);
 
 	return NB_OK;
@@ -2466,6 +2538,833 @@ int isis_instance_segment_routing_prefix_sid_map_prefix_sid_n_flag_clear_modify(
 	return NB_OK;
 }
 
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid
+ */
+int isis_instance_segment_routing_algorithm_prefix_sid_create(
+	struct nb_cb_create_args *args)
+{
+	struct isis_area *area;
+	struct prefix prefix;
+	struct sr_prefix_cfg *pcfg;
+	uint32_t algorithm;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	area = nb_running_get_entry(args->dnode, NULL, true);
+	yang_dnode_get_prefix(&prefix, args->dnode, "./prefix");
+	algorithm = yang_dnode_get_uint32(args->dnode, "./algo");
+
+	pcfg = isis_sr_cfg_prefix_add(area, &prefix, algorithm);
+	pcfg->algorithm = algorithm;
+	nb_running_set_entry(args->dnode, pcfg);
+
+	return NB_OK;
+}
+
+int isis_instance_segment_routing_algorithm_prefix_sid_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+	struct isis_area *area;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	pcfg = nb_running_unset_entry(args->dnode);
+	area = pcfg->area;
+	isis_sr_cfg_prefix_del(pcfg);
+	lsp_regenerate_schedule(area, area->is_type, 0);
+
+	return NB_OK;
+}
+
+int isis_instance_segment_routing_algorithm_prefix_sid_pre_validate(
+	struct nb_cb_pre_validate_args *args)
+{
+	const struct lyd_node *area_dnode;
+	struct isis_area *area;
+	struct prefix prefix;
+	uint32_t srgb_lbound;
+	uint32_t srgb_ubound;
+	uint32_t srgb_range;
+	uint32_t sid;
+	enum sr_sid_value_type sid_type;
+	struct isis_prefix_sid psid = {};
+
+	yang_dnode_get_prefix(&prefix, args->dnode, "./prefix");
+	srgb_lbound = yang_dnode_get_uint32(
+		args->dnode, "../../label-blocks/srgb/lower-bound");
+	srgb_ubound = yang_dnode_get_uint32(
+		args->dnode, "../../label-blocks/srgb/upper-bound");
+	sid = yang_dnode_get_uint32(args->dnode, "./sid-value");
+	sid_type = yang_dnode_get_enum(args->dnode, "./sid-value-type");
+
+	/* Check for invalid indexes/labels. */
+	srgb_range = srgb_ubound - srgb_lbound + 1;
+	psid.value = sid;
+	switch (sid_type) {
+	case SR_SID_VALUE_TYPE_INDEX:
+		if (sid >= srgb_range) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "SID index %u falls outside local SRGB range",
+				 sid);
+			return NB_ERR_VALIDATION;
+		}
+		break;
+	case SR_SID_VALUE_TYPE_ABSOLUTE:
+		if (!IS_MPLS_UNRESERVED_LABEL(sid)) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "Invalid absolute SID %u", sid);
+			return NB_ERR_VALIDATION;
+		}
+		SET_FLAG(psid.flags, ISIS_PREFIX_SID_VALUE);
+		SET_FLAG(psid.flags, ISIS_PREFIX_SID_LOCAL);
+		break;
+	}
+
+	/* Check for Prefix-SID collisions. */
+	area_dnode = yang_dnode_get_parent(args->dnode, "instance");
+	area = nb_running_get_entry(area_dnode, NULL, false);
+	if (!area)
+		return NB_OK;
+
+	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
+		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
+			struct isis_spftree *spftree;
+			struct isis_vertex *vertex_psid;
+
+			if (!(area->is_type & level))
+				continue;
+			spftree = area->spftree[tree][level - 1];
+			if (!spftree)
+				continue;
+
+			vertex_psid =
+				isis_spf_prefix_sid_lookup(spftree, &psid);
+			if (vertex_psid &&
+			    !prefix_same(&vertex_psid->N.ip.p.dest, &prefix)) {
+				snprintfrr(
+					args->errmsg, args->errmsg_len,
+					"Prefix-SID collision detected, SID %s %u is already in use by prefix %pFX (L%u)",
+					CHECK_FLAG(psid.flags,
+						   ISIS_PREFIX_SID_VALUE)
+						? "label"
+						: "index",
+					psid.value, &vertex_psid->N.ip.p.dest,
+					level);
+				return NB_ERR_VALIDATION;
+			}
+		}
+	}
+
+	return NB_OK;
+}
+
+void isis_instance_segment_routing_algorithm_prefix_sid_apply_finish(
+	struct nb_cb_apply_finish_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+	struct isis_area *area;
+
+	pcfg = nb_running_get_entry(args->dnode, NULL, true);
+	area = pcfg->area;
+	lsp_regenerate_schedule(area, area->is_type, 0);
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/sid-value-type
+ */
+int isis_instance_segment_routing_algorithm_prefix_sid_sid_value_type_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	pcfg = nb_running_get_entry(args->dnode, NULL, true);
+	pcfg->sid_type = yang_dnode_get_enum(args->dnode, NULL);
+
+	return NB_OK;
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/sid-value
+ */
+int isis_instance_segment_routing_algorithm_prefix_sid_sid_value_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	pcfg = nb_running_get_entry(args->dnode, NULL, true);
+	pcfg->sid = yang_dnode_get_uint32(args->dnode, NULL);
+
+	return NB_OK;
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sid-map/algorithm-prefix-sid/last-hop-behavior
+ */
+int isis_instance_segment_routing_algorithm_prefix_sid_last_hop_behavior_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	pcfg = nb_running_get_entry(args->dnode, NULL, true);
+	pcfg->last_hop_behavior = yang_dnode_get_enum(args->dnode, NULL);
+
+	return NB_OK;
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/segment-routing/algorithm-prefix-sids/algorithm-prefix-sid/n-flag-clear
+ */
+int isis_instance_segment_routing_algorithm_prefix_sid_n_flag_clear_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct sr_prefix_cfg *pcfg;
+
+	if (args->event != NB_EV_APPLY)
+		return NB_OK;
+
+	pcfg = nb_running_get_entry(args->dnode, NULL, true);
+	pcfg->n_flag_clear = yang_dnode_get_bool(args->dnode, NULL);
+
+	return NB_OK;
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo
+ */
+int isis_instance_flex_algo_create(struct nb_cb_create_args *args)
+{
+	struct isis_area *area;
+	struct flex_algo *fa;
+	bool advertise;
+	uint32_t algorithm;
+	uint32_t priority = FLEX_ALGO_PRIO_DEFAULT;
+	struct isis_flex_algo_alloc_arg arg;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./flex-algo");
+	advertise = yang_dnode_exists(args->dnode, "./advertise-definition");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		area = nb_running_get_entry(args->dnode, NULL, true);
+		arg.algorithm = algorithm;
+		arg.area = area;
+		fa = flex_algo_alloc(area->flex_algos, algorithm, &arg);
+		fa->priority = priority;
+		fa->advertise_definition = advertise;
+		if (area->admin_group_send_zero) {
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_exclude_any);
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_include_any);
+			admin_group_allow_explicit_zero(
+				&fa->admin_group_include_all);
+		}
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+int isis_instance_flex_algo_destroy(struct nb_cb_destroy_args *args)
+{
+	struct isis_area *area;
+	uint32_t algorithm;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./flex-algo");
+	area = nb_running_get_entry(args->dnode, NULL, true);
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		flex_algo_delete(area->flex_algos, algorithm);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/advertise-definition
+ */
+int isis_instance_flex_algo_advertise_definition_modify(
+	struct nb_cb_modify_args *args)
+{
+	struct isis_area *area;
+	struct flex_algo *fa;
+	bool advertise;
+	uint32_t algorithm;
+
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+	advertise = yang_dnode_exists(args->dnode, "./../advertise-definition");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		area = nb_running_get_entry(args->dnode, NULL, true);
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		fa->advertise_definition = advertise;
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+int isis_instance_flex_algo_advertise_definition_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	struct isis_area *area;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+
+	area = nb_running_get_entry(args->dnode, NULL, true);
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		fa->advertise_definition = false;
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+static int isis_instance_flex_algo_affinity_set(struct nb_cb_create_args *args,
+						int type)
+{
+	struct affinity_map *map;
+	struct isis_area *area;
+	struct admin_group *ag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+	const char *val;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "../../flex-algo");
+	area = nb_running_get_entry(args->dnode, NULL, true);
+	val = yang_dnode_get_string(args->dnode, ".");
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		map = affinity_map_get(val);
+		if (!map) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "affinity map %s isn't found", val);
+			return NB_ERR_VALIDATION;
+		}
+		break;
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		map = affinity_map_get(val);
+		if (!map) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "affinity map %s isn't found", val);
+			return NB_ERR_RESOURCE;
+		}
+		if (type == AFFINITY_INCLUDE_ANY)
+			ag = &fa->admin_group_include_any;
+		else if (type == AFFINITY_INCLUDE_ALL)
+			ag = &fa->admin_group_include_all;
+		else if (type == AFFINITY_EXCLUDE_ANY)
+			ag = &fa->admin_group_exclude_any;
+		else
+			break;
+
+		admin_group_set(ag, map->bit_position);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	}
+
+	return NB_OK;
+}
+
+static int
+isis_instance_flex_algo_affinity_unset(struct nb_cb_destroy_args *args,
+				       int type)
+{
+	struct affinity_map *map;
+	struct isis_area *area;
+	struct admin_group *ag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+	const char *val;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "../../flex-algo");
+	area = nb_running_get_entry(args->dnode, NULL, true);
+	val = yang_dnode_get_string(args->dnode, ".");
+
+	switch (args->event) {
+	case NB_EV_VALIDATE:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		map = affinity_map_get(val);
+		if (!map) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "affinity map %s isn't found", val);
+			return NB_ERR_VALIDATION;
+		}
+		break;
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		map = affinity_map_get(val);
+		if (!map) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "affinity map %s isn't found", val);
+			return NB_ERR_RESOURCE;
+		}
+		if (type == AFFINITY_INCLUDE_ANY)
+			ag = &fa->admin_group_include_any;
+		else if (type == AFFINITY_INCLUDE_ALL)
+			ag = &fa->admin_group_include_all;
+		else if (type == AFFINITY_EXCLUDE_ANY)
+			ag = &fa->admin_group_exclude_any;
+		else
+			break;
+
+		admin_group_unset(ag, map->bit_position);
+		if (area->admin_group_send_zero)
+			admin_group_allow_explicit_zero(ag);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	}
+
+	return NB_OK;
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/flex-algos/flex-algo/affinity-include-anies/affinity-include-any
+ */
+int isis_instance_flex_algo_affinity_include_any_create(
+	struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_affinity_set(args, AFFINITY_INCLUDE_ANY);
+}
+
+int isis_instance_flex_algo_affinity_include_any_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_affinity_unset(args,
+						      AFFINITY_INCLUDE_ANY);
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/flex-algos/flex-algo/affinity-include-alls/affinity-include-all
+ */
+int isis_instance_flex_algo_affinity_include_all_create(
+	struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_affinity_set(args, AFFINITY_INCLUDE_ALL);
+}
+
+int isis_instance_flex_algo_affinity_include_all_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_affinity_unset(args,
+						      AFFINITY_INCLUDE_ALL);
+}
+
+/*
+ * XPath:
+ * /frr-isisd:isis/instance/flex-algos/flex-algo/affinity-exclude-anies/affinity-exclude-any
+ */
+int isis_instance_flex_algo_affinity_exclude_any_create(
+	struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_affinity_set(args, AFFINITY_EXCLUDE_ANY);
+}
+
+int isis_instance_flex_algo_affinity_exclude_any_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_affinity_unset(args,
+						      AFFINITY_EXCLUDE_ANY);
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/prefix-metric
+ */
+
+int isis_instance_flex_algo_prefix_metric_create(struct nb_cb_create_args *args)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		SET_FLAG(fa->flags, FAD_FLAG_M);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+int isis_instance_flex_algo_prefix_metric_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		UNSET_FLAG(fa->flags, FAD_FLAG_M);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+static int isis_instance_flex_algo_dplane_set(struct nb_cb_create_args *args,
+					      int type)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		SET_FLAG(fa->dataplanes, type);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+		if (type == FLEX_ALGO_SRV6 || type == FLEX_ALGO_IP) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "%s Flex-algo dataplane is not yet supported.",
+				 type == FLEX_ALGO_SRV6 ? "SRv6" : "IP");
+			return NB_ERR_VALIDATION;
+		}
+		break;
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+static int isis_instance_flex_algo_dplane_unset(struct nb_cb_destroy_args *args,
+						int type)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		UNSET_FLAG(fa->dataplanes, type);
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/dplane-sr-mpls
+ */
+
+int isis_instance_flex_algo_dplane_sr_mpls_create(
+	struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_dplane_set(args, FLEX_ALGO_SR_MPLS);
+}
+
+int isis_instance_flex_algo_dplane_sr_mpls_destroy(
+	struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_dplane_unset(args, FLEX_ALGO_SR_MPLS);
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/dplane-srv6
+ */
+
+int isis_instance_flex_algo_dplane_srv6_create(struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_dplane_set(args, FLEX_ALGO_SRV6);
+}
+
+int isis_instance_flex_algo_dplane_srv6_destroy(struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_dplane_unset(args, FLEX_ALGO_SRV6);
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/dplane-ip
+ */
+
+int isis_instance_flex_algo_dplane_ip_create(struct nb_cb_create_args *args)
+{
+	return isis_instance_flex_algo_dplane_set(args, FLEX_ALGO_IP);
+}
+
+int isis_instance_flex_algo_dplane_ip_destroy(struct nb_cb_destroy_args *args)
+{
+	return isis_instance_flex_algo_dplane_unset(args, FLEX_ALGO_IP);
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/metric-type
+ */
+
+int isis_instance_flex_algo_metric_type_modify(struct nb_cb_modify_args *args)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+	enum flex_algo_metric_type metric_type;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+	metric_type = yang_dnode_get_enum(args->dnode, NULL);
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		fa->metric_type = metric_type;
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+/*
+ * XPath: /frr-isisd:isis/instance/flex-algos/flex-algo/priority
+ */
+
+int isis_instance_flex_algo_priority_modify(struct nb_cb_modify_args *args)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+	uint32_t priority;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+	priority = yang_dnode_get_uint32(args->dnode, NULL);
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		fa->priority = priority;
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
+int isis_instance_flex_algo_priority_destroy(struct nb_cb_destroy_args *args)
+{
+	struct isis_area *area;
+	const char *area_tag;
+	struct flex_algo *fa;
+	uint32_t algorithm;
+	uint32_t priority = FLEX_ALGO_PRIO_DEFAULT;
+
+	area_tag = yang_dnode_get_string(args->dnode, "../../../area-tag");
+	area = isis_area_lookup(area_tag, VRF_DEFAULT);
+	if (!area)
+		return NB_ERR_RESOURCE;
+
+	algorithm = yang_dnode_get_uint32(args->dnode, "./../flex-algo");
+	priority = yang_dnode_get_uint32(args->dnode, NULL);
+
+	switch (args->event) {
+	case NB_EV_APPLY:
+		fa = flex_algo_lookup(area->flex_algos, algorithm);
+		if (!fa) {
+			snprintf(args->errmsg, args->errmsg_len,
+				 "flex-algo object not found");
+			return NB_ERR_RESOURCE;
+		}
+		fa->priority = priority;
+		lsp_regenerate_schedule(area, area->is_type, 0);
+		break;
+	case NB_EV_VALIDATE:
+	case NB_EV_PREPARE:
+	case NB_EV_ABORT:
+		break;
+	}
+
+	return NB_OK;
+}
+
 /*
  * XPath: /frr-isisd:isis/instance/mpls/ldp-sync
  */
@@ -2588,7 +3487,8 @@ int lib_interface_isis_area_tag_modify(struct nb_cb_modify_args *args)
 	struct isis_circuit *circuit;
 
 	if (args->event == NB_EV_VALIDATE) {
-		circuit = nb_running_get_entry_non_rec(lyd_parent(args->dnode), NULL, false);
+		circuit = nb_running_get_entry_non_rec(lyd_parent(args->dnode),
+						       NULL, false);
 		if (circuit) {
 			snprintf(args->errmsg, args->errmsg_len,
 				 "Changing area tag is not allowed");

isisd/isis_route.c

@@ -36,9 +36,12 @@
 #include "isis_spf_private.h"
 #include "isis_route.h"
 #include "isis_zebra.h"
+#include "isis_flex_algo.h"
 
 DEFINE_MTYPE_STATIC(ISISD, ISIS_NEXTHOP,    "ISIS nexthop");
 DEFINE_MTYPE_STATIC(ISISD, ISIS_ROUTE_INFO, "ISIS route info");
+DEFINE_MTYPE_STATIC(ISISD, ISIS_ROUTE_TABLE_INFO, "ISIS route table info");
+
 
 DEFINE_HOOK(isis_route_update_hook,
 	    (struct isis_area * area, struct prefix *prefix,
@@ -51,8 +54,25 @@ static void isis_route_update(struct isis_area *area, struct prefix *prefix,
 			      struct prefix_ipv6 *src_p,
 			      struct isis_route_info *route_info);
 
-static struct isis_nexthop *isis_nexthop_create(int family, union g_addr *ip,
-						ifindex_t ifindex)
+static struct mpls_label_stack *
+label_stack_dup(const struct mpls_label_stack *const orig)
+{
+	struct mpls_label_stack *copy;
+	int array_size;
+
+	if (orig == NULL)
+		return NULL;
+
+	array_size = orig->num_labels * sizeof(mpls_label_t);
+	copy = XCALLOC(MTYPE_ISIS_NEXTHOP_LABELS,
+		       sizeof(struct mpls_label_stack) + array_size);
+	copy->num_labels = orig->num_labels;
+	memcpy(copy->label, orig->label, array_size);
+	return copy;
+}
+
+static struct isis_nexthop *
+isis_nexthop_create(int family, const union g_addr *const ip, ifindex_t ifindex)
 {
 	struct isis_nexthop *nexthop;
 
@@ -65,12 +85,40 @@ static struct isis_nexthop *isis_nexthop_create(int family, union g_addr *ip,
 	return nexthop;
 }
 
+static struct isis_nexthop *
+isis_nexthop_dup(const struct isis_nexthop *const orig)
+{
+	struct isis_nexthop *nexthop;
+
+	nexthop = isis_nexthop_create(orig->family, &orig->ip, orig->ifindex);
+	memcpy(nexthop->sysid, orig->sysid, ISIS_SYS_ID_LEN);
+	nexthop->sr = orig->sr;
+	nexthop->label_stack = label_stack_dup(orig->label_stack);
+
+	return nexthop;
+}
+
 void isis_nexthop_delete(struct isis_nexthop *nexthop)
 {
 	XFREE(MTYPE_ISIS_NEXTHOP_LABELS, nexthop->label_stack);
 	XFREE(MTYPE_ISIS_NEXTHOP, nexthop);
 }
 
+static struct list *isis_nexthop_list_dup(const struct list *orig)
+{
+	struct list *copy;
+	struct listnode *node;
+	struct isis_nexthop *nh;
+	struct isis_nexthop *nhcopy;
+
+	copy = list_new();
+	for (ALL_LIST_ELEMENTS_RO(orig, node, nh)) {
+		nhcopy = isis_nexthop_dup(nh);
+		listnode_add(copy, nhcopy);
+	}
+	return copy;
+}
+
 static struct isis_nexthop *nexthoplookup(struct list *nexthops, int family,
 					  union g_addr *ip, ifindex_t ifindex)
 {
@@ -238,13 +286,28 @@ isis_route_info_new(struct prefix *prefix, struct prefix_ipv6 *src_p,
 
 	rinfo->cost = cost;
 	rinfo->depth = depth;
-	rinfo->sr = *sr;
+	rinfo->sr_algo[sr->algorithm] = *sr;
+	rinfo->sr_algo[sr->algorithm].nexthops = rinfo->nexthops;
+	rinfo->sr_algo[sr->algorithm].nexthops_backup =
+		rinfo->backup ? rinfo->backup->nexthops : NULL;
 
 	return rinfo;
 }
 
 static void isis_route_info_delete(struct isis_route_info *route_info)
 {
+	for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+		if (!route_info->sr_algo[i].present)
+			continue;
+
+		if (route_info->sr_algo[i].nexthops == route_info->nexthops)
+			continue;
+
+		route_info->sr_algo[i].nexthops->del =
+			(void (*)(void *))isis_nexthop_delete;
+		list_delete(&route_info->sr_algo[i].nexthops);
+	}
+
 	if (route_info->nexthops) {
 		route_info->nexthops->del =
 			(void (*)(void *))isis_nexthop_delete;
@@ -260,6 +323,27 @@ void isis_route_node_cleanup(struct route_table *table, struct route_node *node)
 		isis_route_info_delete(node->info);
 }
 
+struct isis_route_table_info *isis_route_table_info_alloc(uint8_t algorithm)
+{
+	struct isis_route_table_info *info;
+
+	info = XCALLOC(MTYPE_ISIS_ROUTE_TABLE_INFO, sizeof(*info));
+	info->algorithm = algorithm;
+	return info;
+}
+
+void isis_route_table_info_free(void *info)
+{
+	XFREE(MTYPE_ISIS_ROUTE_TABLE_INFO, info);
+}
+
+uint8_t isis_route_table_algorithm(const struct route_table *table)
+{
+	const struct isis_route_table_info *info = table->info;
+
+	return info ? info->algorithm : 0;
+}
+
 static bool isis_sr_psid_info_same(struct isis_sr_psid_info *new,
 				   struct isis_sr_psid_info *old)
 {
@@ -273,6 +357,9 @@ static bool isis_sr_psid_info_same(struct isis_sr_psid_info *new,
 	    || new->sid.value != old->sid.value)
 		return false;
 
+	if (new->sid.algorithm != old->sid.algorithm)
+		return false;
+
 	return true;
 }
 
@@ -313,10 +400,22 @@ static int isis_route_info_same(struct isis_route_info *new,
 		return 0;
 	}
 
-	if (!isis_sr_psid_info_same(&new->sr, &old->sr)) {
-		if (buf)
-			snprintf(buf, buf_size, "SR input label");
-		return 0;
+	for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+		struct isis_sr_psid_info new_sr_algo;
+		struct isis_sr_psid_info old_sr_algo;
+
+		new_sr_algo = new->sr_algo[i];
+		old_sr_algo = old->sr_algo[i];
+
+		if (!isis_sr_psid_info_same(&new_sr_algo, &old_sr_algo)) {
+			if (buf)
+				snprintf(
+					buf, buf_size,
+					"SR input label algo-%u (old: %s, new: %s)",
+					i, old_sr_algo.present ? "yes" : "no",
+					new_sr_algo.present ? "yes" : "no");
+			return 0;
+		}
 	}
 
 	if (new->nexthops->count != old->nexthops->count) {
@@ -405,7 +504,9 @@ isis_route_create(struct prefix *prefix, struct prefix_ipv6 *src_p,
 				zlog_debug(
 					"ISIS-Rte (%s): route changed: %pFX, change: %s",
 					area->area_tag, prefix, change_buf);
-			rinfo_new->sr_previous = rinfo_old->sr;
+			for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
+				rinfo_new->sr_algo_previous[i] =
+					rinfo_old->sr_algo[i];
 			isis_route_info_delete(rinfo_old);
 			route_info = rinfo_new;
 			UNSET_FLAG(route_info->flag,
@@ -461,11 +562,42 @@ static void isis_route_remove_previous_sid(struct isis_area *area,
 	 * Explicitly uninstall previous Prefix-SID label if it has
 	 * changed or was removed.
 	 */
-	if (route_info->sr_previous.present &&
-	    (!route_info->sr.present ||
-	     route_info->sr_previous.label != route_info->sr.label))
-		isis_zebra_prefix_sid_uninstall(area, prefix, route_info,
-						&route_info->sr_previous);
+	for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+		if (route_info->sr_algo_previous[i].present &&
+		    (!route_info->sr_algo[i].present ||
+		     route_info->sr_algo_previous[i].label !=
+			     route_info->sr_algo[i].label))
+			isis_zebra_prefix_sid_uninstall(
+				area, prefix, route_info,
+				&route_info->sr_algo_previous[i]);
+	}
+}
+
+static void set_merge_route_info_sr_algo(struct isis_route_info *mrinfo,
+					 struct isis_route_info *rinfo)
+{
+	for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+		if (rinfo->sr_algo[i].present) {
+			assert(i == rinfo->sr_algo[i].algorithm);
+			assert(rinfo->nexthops);
+			assert(rinfo->backup ? rinfo->backup->nexthops != NULL
+					     : true);
+
+			if (mrinfo->sr_algo[i].nexthops != NULL &&
+			    mrinfo->sr_algo[i].nexthops != mrinfo->nexthops) {
+				mrinfo->sr_algo[i].nexthops->del =
+					(void (*)(void *))isis_nexthop_delete;
+				list_delete(&mrinfo->sr_algo[i].nexthops);
+			}
+
+			mrinfo->sr_algo[i] = rinfo->sr_algo[i];
+			mrinfo->sr_algo[i].nexthops = isis_nexthop_list_dup(
+				rinfo->sr_algo[i].nexthops);
+		}
+	}
+
+	UNSET_FLAG(rinfo->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
+	UNSET_FLAG(mrinfo->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 }
 
 static void isis_route_update(struct isis_area *area, struct prefix *prefix,
@@ -484,19 +616,35 @@ static void isis_route_update(struct isis_area *area, struct prefix *prefix,
 		/* Install route. */
 		isis_zebra_route_add_route(area->isis, prefix, src_p,
 					   route_info);
-		/* Install/reinstall Prefix-SID label. */
-		if (route_info->sr.present)
-			isis_zebra_prefix_sid_install(area, prefix, route_info,
-						      &route_info->sr);
+
+		for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+			struct isis_sr_psid_info sr_algo;
+
+			sr_algo = route_info->sr_algo[i];
+
+			/*
+			 * Install/reinstall Prefix-SID label.
+			 */
+			if (sr_algo.present)
+				isis_zebra_prefix_sid_install(area, prefix,
+							      &sr_algo);
+
+			hook_call(isis_route_update_hook, area, prefix,
+				  route_info);
+		}
+
 		hook_call(isis_route_update_hook, area, prefix, route_info);
 
 		SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 		UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 	} else {
 		/* Uninstall Prefix-SID label. */
-		if (route_info->sr.present)
-			isis_zebra_prefix_sid_uninstall(
-				area, prefix, route_info, &route_info->sr);
+		for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
+			if (route_info->sr_algo[i].present)
+				isis_zebra_prefix_sid_uninstall(
+					area, prefix, route_info,
+					&route_info->sr_algo[i]);
+
 		/* Uninstall route. */
 		isis_zebra_route_del_route(area->isis, prefix, src_p,
 					   route_info);
@@ -516,6 +664,7 @@ static void _isis_route_verify_table(struct isis_area *area,
 #ifdef EXTREME_DEBUG
 	char buff[SRCDEST2STR_BUFFER];
 #endif /* EXTREME_DEBUG */
+	uint8_t algorithm = isis_route_table_algorithm(table);
 
 	for (rnode = route_top(table); rnode;
 	     rnode = srcdest_route_next(rnode)) {
@@ -538,10 +687,14 @@ static void _isis_route_verify_table(struct isis_area *area,
 							 src_p);
 			if (rnode_bck) {
 				rinfo->backup = rnode_bck->info;
+				rinfo->sr_algo[algorithm].nexthops_backup =
+					rinfo->backup->nexthops;
 				UNSET_FLAG(rinfo->flag,
 					   ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 			} else if (rinfo->backup) {
 				rinfo->backup = NULL;
+				rinfo->sr_algo[algorithm].nexthops_backup =
+					NULL;
 				UNSET_FLAG(rinfo->flag,
 					   ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 			}
@@ -573,7 +726,7 @@ static void _isis_route_verify_table(struct isis_area *area,
 		if (CHECK_FLAG(rinfo->flag, ISIS_ROUTE_FLAG_ACTIVE))
 			continue;
 
-		/* Area is either L1 or L2 => we use level route tables
+		/* In case the verify is not for a merge, we use a single table
 		 * directly for
 		 * validating => no problems with deleting routes. */
 		if (!tables) {
@@ -581,13 +734,12 @@ static void _isis_route_verify_table(struct isis_area *area,
 			continue;
 		}
 
-		/* If area is L1L2, we work with merge table and
-		 * therefore must
-		 * delete node from level tables as well before deleting
+		/* If we work on a merged table,
+		 * therefore we must
+		 * delete node from each table as well before deleting
 		 * route info. */
-		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
-			drnode = srcdest_rnode_lookup(tables[level - 1],
-						      dst_p, src_p);
+		for (int i = 0; tables[i]; i++) {
+			drnode = srcdest_rnode_lookup(tables[i], dst_p, src_p);
 			if (!drnode)
 				continue;
 
@@ -604,10 +756,36 @@ static void _isis_route_verify_table(struct isis_area *area,
 	}
 }
 
+static void _isis_route_verify_merge(struct isis_area *area,
+				     struct route_table **tables,
+				     struct route_table **tables_backup,
+				     int tree);
+
 void isis_route_verify_table(struct isis_area *area, struct route_table *table,
-			     struct route_table *table_backup)
+			     struct route_table *table_backup, int tree)
 {
-	_isis_route_verify_table(area, table, table_backup, NULL);
+	struct route_table *tables[SR_ALGORITHM_COUNT] = {table};
+	struct route_table *tables_backup[SR_ALGORITHM_COUNT] = {table_backup};
+#ifndef FABRICD
+	int tables_next = 1;
+	int level = area->is_type == IS_LEVEL_1 ? ISIS_LEVEL1 : ISIS_LEVEL2;
+	struct listnode *node;
+	struct flex_algo *fa;
+	struct isis_flex_algo_data *data;
+
+	for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, node, fa)) {
+		data = fa->data;
+		tables[tables_next] =
+			data->spftree[tree][level - 1]->route_table;
+		tables_backup[tables_next] =
+			data->spftree[tree][level - 1]->route_table_backup;
+		_isis_route_verify_table(area, tables[tables_next],
+					 tables_backup[tables_next], NULL);
+		tables_next++;
+	}
+#endif /* ifndef FABRICD */
+
+	_isis_route_verify_merge(area, tables, tables_backup, tree);
 }
 
 /* Function to validate route tables for L1L2 areas. In this case we can't use
@@ -624,18 +802,27 @@ void isis_route_verify_merge(struct isis_area *area,
 			     struct route_table *level1_table,
 			     struct route_table *level1_table_backup,
 			     struct route_table *level2_table,
-			     struct route_table *level2_table_backup)
+			     struct route_table *level2_table_backup, int tree)
 {
-	struct route_table *tables[] = {level1_table, level2_table};
+	struct route_table *tables[] = {level1_table, level2_table, NULL};
 	struct route_table *tables_backup[] = {level1_table_backup,
-					       level2_table_backup};
+					       level2_table_backup, NULL};
+	_isis_route_verify_merge(area, tables, tables_backup, tree);
+}
+
+static void _isis_route_verify_merge(struct isis_area *area,
+				     struct route_table **tables,
+				     struct route_table **tables_backup,
+				     int tree)
+{
 	struct route_table *merge;
 	struct route_node *rnode, *mrnode;
 
 	merge = srcdest_table_init();
 
-	for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
-		for (rnode = route_top(tables[level - 1]); rnode;
+	for (int i = 0; tables[i]; i++) {
+		uint8_t algorithm = isis_route_table_algorithm(tables[i]);
+		for (rnode = route_top(tables[i]); rnode;
 		     rnode = srcdest_route_next(rnode)) {
 			struct isis_route_info *rinfo = rnode->info;
 			struct route_node *rnode_bck;
@@ -651,14 +838,18 @@ void isis_route_verify_merge(struct isis_area *area,
 					       (const struct prefix **)&src_p);
 
 			/* Link primary route to backup route. */
-			rnode_bck = srcdest_rnode_lookup(
-				tables_backup[level - 1], prefix, src_p);
+			rnode_bck = srcdest_rnode_lookup(tables_backup[i],
+							 prefix, src_p);
 			if (rnode_bck) {
 				rinfo->backup = rnode_bck->info;
+				rinfo->sr_algo[algorithm].nexthops_backup =
+					rinfo->backup->nexthops;
 				UNSET_FLAG(rinfo->flag,
 					   ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 			} else if (rinfo->backup) {
 				rinfo->backup = NULL;
+				rinfo->sr_algo[algorithm].nexthops_backup =
+					NULL;
 				UNSET_FLAG(rinfo->flag,
 					   ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
 			}
@@ -667,6 +858,8 @@ void isis_route_verify_merge(struct isis_area *area,
 			struct isis_route_info *mrinfo = mrnode->info;
 			if (mrinfo) {
 				route_unlock_node(mrnode);
+				set_merge_route_info_sr_algo(mrinfo, rinfo);
+
 				if (CHECK_FLAG(mrinfo->flag,
 					       ISIS_ROUTE_FLAG_ACTIVE)) {
 					/* Clear the ZEBRA_SYNCED flag on the
@@ -696,8 +889,9 @@ void isis_route_verify_merge(struct isis_area *area,
 						ISIS_ROUTE_FLAG_ZEBRA_SYNCED)) {
 					continue;
 				}
+			} else {
+				mrnode->info = rnode->info;
 			}
-			mrnode->info = rnode->info;
 		}
 	}
 
@@ -710,6 +904,7 @@ void isis_route_invalidate_table(struct isis_area *area,
 {
 	struct route_node *rode;
 	struct isis_route_info *rinfo;
+	uint8_t algorithm = isis_route_table_algorithm(table);
 	for (rode = route_top(table); rode; rode = srcdest_route_next(rode)) {
 		if (rode->info == NULL)
 			continue;
@@ -717,6 +912,7 @@ void isis_route_invalidate_table(struct isis_area *area,
 
 		if (rinfo->backup) {
 			rinfo->backup = NULL;
+			rinfo->sr_algo[algorithm].nexthops_backup = NULL;
 			/*
 			 * For now, always force routes that have backup
 			 * nexthops to be reinstalled.

isisd/isis_route.h

@@ -30,12 +30,16 @@ struct isis_route_info {
 	uint8_t flag;
 	uint32_t cost;
 	uint32_t depth;
-	struct isis_sr_psid_info sr;
-	struct isis_sr_psid_info sr_previous;
+	struct isis_sr_psid_info sr_algo[SR_ALGORITHM_COUNT];
+	struct isis_sr_psid_info sr_algo_previous[SR_ALGORITHM_COUNT];
 	struct list *nexthops;
 	struct isis_route_info *backup;
 };
 
+struct isis_route_table_info {
+	uint8_t algorithm;
+};
+
 DECLARE_HOOK(isis_route_update_hook,
 	     (struct isis_area * area, struct prefix *prefix,
 	      struct isis_route_info *route_info),
@@ -56,14 +60,14 @@ void isis_route_delete(struct isis_area *area, struct route_node *rode,
 /* Walk the given table and install new routes to zebra and remove old ones.
  * route status is tracked using ISIS_ROUTE_FLAG_ACTIVE */
 void isis_route_verify_table(struct isis_area *area, struct route_table *table,
-			     struct route_table *table_backup);
+			     struct route_table *table_backup, int tree);
 
 /* Same as isis_route_verify_table, but merge L1 and L2 routes before */
 void isis_route_verify_merge(struct isis_area *area,
 			     struct route_table *level1_table,
 			     struct route_table *level1_table_backup,
 			     struct route_table *level2_table,
-			     struct route_table *level2_table_backup);
+			     struct route_table *level2_table_backup, int tree);
 
 /* Unset ISIS_ROUTE_FLAG_ACTIVE on all routes. Used before running spf. */
 void isis_route_invalidate_table(struct isis_area *area,
@@ -73,9 +77,14 @@ void isis_route_invalidate_table(struct isis_area *area,
 void isis_route_node_cleanup(struct route_table *table,
 			     struct route_node *node);
 
+
 void isis_route_switchover_nexthop(struct isis_area *area,
 				   struct route_table *table, int family,
 				   union g_addr *nexthop_addr,
 				   ifindex_t ifindex);
 
+struct isis_route_table_info *isis_route_table_info_alloc(uint8_t algorithm);
+void isis_route_table_info_free(void *info);
+uint8_t isis_route_table_algorithm(const struct route_table *table);
+
 #endif /* _ZEBRA_ISIS_ROUTE_H */

isisd/isis_spf.h

@@ -12,6 +12,7 @@
 #define _ZEBRA_ISIS_SPF_H
 
 #include "isisd/isis_lfa.h"
+#include "lib/json.h"
 
 struct isis_spftree;
 
@@ -37,16 +38,15 @@ struct isis_spf_adj {
 #define F_ISIS_SPF_ADJ_METRIC_INFINITY 0x04
 };
 
-struct isis_spftree *isis_spftree_new(struct isis_area *area,
-				      struct lspdb_head *lspdb,
-				      const uint8_t *sysid, int level,
-				      enum spf_tree_id tree_id,
-				      enum spf_type type, uint8_t flags);
+struct isis_spftree *
+isis_spftree_new(struct isis_area *area, struct lspdb_head *lspdb,
+		 const uint8_t *sysid, int level, enum spf_tree_id tree_id,
+		 enum spf_type type, uint8_t flags, uint8_t algorithm);
 struct isis_vertex *isis_spf_prefix_sid_lookup(struct isis_spftree *spftree,
 					       struct isis_prefix_sid *psid);
 void isis_spf_invalidate_routes(struct isis_spftree *tree);
-void isis_spf_verify_routes(struct isis_area *area,
-			    struct isis_spftree **trees);
+void isis_spf_verify_routes(struct isis_area *area, struct isis_spftree **trees,
+			    int tree);
 void isis_spf_switchover_routes(struct isis_area *area,
 				struct isis_spftree **trees, int family,
 				union g_addr *nexthop_ip, ifindex_t ifindex,
@@ -63,7 +63,7 @@ int _isis_spf_schedule(struct isis_area *area, int level,
 		       const char *func, const char *file, int line);
 void isis_print_spftree(struct vty *vty, struct isis_spftree *spftree);
 void isis_print_routes(struct vty *vty, struct isis_spftree *spftree,
-		       bool prefix_sid, bool backup);
+		       json_object **json, bool prefix_sid, bool backup);
 void isis_spf_init(void);
 void isis_spf_print(struct isis_spftree *spftree, struct vty *vty);
 void isis_spf_print_json(struct isis_spftree *spftree,

isisd/isis_spf_private.h

@@ -349,11 +349,16 @@ struct isis_spftree {
 			uint32_t total[SPF_PREFIX_PRIO_MAX];
 		} protection_counters;
 	} lfa;
+	uint8_t algorithm;
 	uint8_t flags;
 };
 #define F_SPFTREE_HOPCOUNT_METRIC 0x01
 #define F_SPFTREE_NO_ROUTES 0x02
 #define F_SPFTREE_NO_ADJACENCIES 0x04
+#ifndef FABRICD
+/* flex-algo */
+#define F_SPFTREE_DISABLED 0x08
+#endif /* ifndef FABRICD */
 
 __attribute__((__unused__))
 static void isis_vertex_id_init(struct isis_vertex *vertex, const void *id,

isisd/isis_sr.c

@@ -57,7 +57,17 @@ static void sr_adj_sid_del(struct sr_adjacency *sra);
 static inline int sr_prefix_sid_cfg_compare(const struct sr_prefix_cfg *a,
 					    const struct sr_prefix_cfg *b)
 {
-	return prefix_cmp(&a->prefix, &b->prefix);
+	int ret;
+
+	ret = prefix_cmp(&a->prefix, &b->prefix);
+	if (ret != 0)
+		return ret;
+
+	ret = a->algorithm - b->algorithm;
+	if (ret != 0)
+		return ret;
+
+	return 0;
 }
 DECLARE_RBTREE_UNIQ(srdb_prefix_cfg, struct sr_prefix_cfg, entry,
 		    sr_prefix_sid_cfg_compare);
@@ -331,7 +341,8 @@ int isis_sr_cfg_srlb_update(struct isis_area *area, uint32_t lower_bound,
  * @return	  Newly added Prefix-SID configuration structure
  */
 struct sr_prefix_cfg *isis_sr_cfg_prefix_add(struct isis_area *area,
-					     const struct prefix *prefix)
+					     const struct prefix *prefix,
+					     uint8_t algorithm)
 {
 	struct sr_prefix_cfg *pcfg;
 	struct interface *ifp;
@@ -341,6 +352,7 @@ struct sr_prefix_cfg *isis_sr_cfg_prefix_add(struct isis_area *area,
 	pcfg = XCALLOC(MTYPE_ISIS_SR_INFO, sizeof(*pcfg));
 	pcfg->prefix = *prefix;
 	pcfg->area = area;
+	pcfg->algorithm = algorithm;
 
 	/* Pull defaults from the YANG module. */
 	pcfg->sid_type = yang_get_default_enum(
@@ -386,11 +398,13 @@ void isis_sr_cfg_prefix_del(struct sr_prefix_cfg *pcfg)
  * @return	  Configured Prefix-SID structure if found, NULL otherwise
  */
 struct sr_prefix_cfg *isis_sr_cfg_prefix_find(struct isis_area *area,
-					      union prefixconstptr prefix)
+					      union prefixconstptr prefix,
+					      uint8_t algorithm)
 {
 	struct sr_prefix_cfg pcfg = {};
 
 	prefix_copy(&pcfg.prefix, prefix.p);
+	pcfg.algorithm = algorithm;
 	return srdb_prefix_cfg_find(&area->srdb.config.prefix_sids, &pcfg);
 }
 
@@ -405,7 +419,7 @@ void isis_sr_prefix_cfg2subtlv(const struct sr_prefix_cfg *pcfg, bool external,
 			       struct isis_prefix_sid *psid)
 {
 	/* Set SID algorithm. */
-	psid->algorithm = SR_ALGORITHM_SPF;
+	psid->algorithm = pcfg->algorithm;
 
 	/* Set SID flags. */
 	psid->flags = 0;
@@ -917,10 +931,12 @@ static int sr_adj_ip_disabled(struct isis_adjacency *adj, int family,
  */
 static int sr_if_new_hook(struct interface *ifp)
 {
+	struct sr_prefix_cfg *pcfgs[SR_ALGORITHM_COUNT] = {NULL};
 	struct isis_circuit *circuit;
 	struct isis_area *area;
 	struct connected *connected;
 	struct listnode *node;
+	bool need_lsp_regenerate = false;
 
 	/* Get corresponding circuit */
 	circuit = circuit_scan_by_ifp(ifp);
@@ -937,18 +953,24 @@ static int sr_if_new_hook(struct interface *ifp)
 	 * configuration before receiving interface information from zebra.
 	 */
 	FOR_ALL_INTERFACES_ADDRESSES (ifp, connected, node) {
-		struct sr_prefix_cfg *pcfg;
 
-		pcfg = isis_sr_cfg_prefix_find(area, connected->address);
-		if (!pcfg)
-			continue;
+		for (int i = 0; i < SR_ALGORITHM_COUNT; i++) {
+			pcfgs[i] = isis_sr_cfg_prefix_find(
+				area, connected->address, i);
 
-		if (sr_prefix_is_node_sid(ifp, &pcfg->prefix)) {
-			pcfg->node_sid = true;
-			lsp_regenerate_schedule(area, area->is_type, 0);
+			if (!pcfgs[i])
+				continue;
+
+			if (sr_prefix_is_node_sid(ifp, &pcfgs[i]->prefix)) {
+				pcfgs[i]->node_sid = true;
+				need_lsp_regenerate = true;
+			}
 		}
 	}
 
+	if (need_lsp_regenerate)
+		lsp_regenerate_schedule(area, area->is_type, 0);
+
 	return 0;
 }
 
@@ -998,10 +1020,12 @@ char *sr_op2str(char *buf, size_t size, mpls_label_t label_in,
  * @param area	IS-IS area
  * @param level	IS-IS level
  */
-static void show_node(struct vty *vty, struct isis_area *area, int level)
+static void show_node(struct vty *vty, struct isis_area *area, int level,
+		      uint8_t algo)
 {
 	struct isis_lsp *lsp;
 	struct ttable *tt;
+	char buf[128];
 
 	vty_out(vty, " IS-IS %s SR-Nodes:\n\n", circuit_t2string(level));
 
@@ -1021,15 +1045,24 @@ static void show_node(struct vty *vty, struct isis_area *area, int level)
 		cap = lsp->tlvs->router_cap;
 		if (!cap)
 			continue;
+		if (cap->algo[algo] == SR_ALGORITHM_UNSET)
+			continue;
+
+		if (cap->algo[algo] == SR_ALGORITHM_SPF)
+			snprintf(buf, sizeof(buf), "SPF");
+		else if (cap->algo[algo] == SR_ALGORITHM_STRICT_SPF)
+			snprintf(buf, sizeof(buf), "S-SPF");
+#ifndef FABRICD
+		else
+			snprintf(buf, sizeof(buf), "Flex-Algo %d", algo);
+#endif /* ifndef FABRICD */
 
 		ttable_add_row(tt, "%pSY|%u - %u|%u - %u|%s|%u",
 			       lsp->hdr.lsp_id, cap->srgb.lower_bound,
 			       cap->srgb.lower_bound + cap->srgb.range_size - 1,
 			       cap->srlb.lower_bound,
 			       cap->srlb.lower_bound + cap->srlb.range_size - 1,
-			       cap->algo[0] == SR_ALGORITHM_SPF ? "SPF"
-								: "S-SPF",
-			       cap->msd);
+			       buf, cap->msd);
 	}
 
 	/* Dump the generated table. */
@@ -1044,15 +1077,31 @@ static void show_node(struct vty *vty, struct isis_area *area, int level)
 }
 
 DEFUN(show_sr_node, show_sr_node_cmd,
-      "show " PROTO_NAME " segment-routing node",
-      SHOW_STR
-      PROTO_HELP
+      "show " PROTO_NAME
+      " segment-routing node"
+#ifndef FABRICD
+      " [algorithm (128-255)]"
+#endif /* ifndef FABRICD */
+      ,
+      SHOW_STR PROTO_HELP
       "Segment-Routing\n"
-      "Segment-Routing node\n")
+      "Segment-Routing node\n"
+#ifndef FABRICD
+      "Show Flex-algo nodes\n"
+      "Algorithm number\n"
+#endif /* ifndef FABRICD */
+)
 {
 	struct listnode *node, *inode;
 	struct isis_area *area;
+	uint8_t algorithm = SR_ALGORITHM_SPF;
 	struct isis *isis;
+#ifndef FABRICD
+	int idx = 0;
+
+	if (argv_find(argv, argc, "algorithm", &idx))
+		algorithm = (uint8_t)strtoul(argv[idx + 1]->arg, NULL, 10);
+#endif /* ifndef FABRICD */
 
 	for (ALL_LIST_ELEMENTS_RO(im->isis, inode, isis)) {
 		for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area)) {
@@ -1064,7 +1113,7 @@ DEFUN(show_sr_node, show_sr_node_cmd,
 			}
 			for (int level = ISIS_LEVEL1; level <= ISIS_LEVELS;
 			     level++)
-				show_node(vty, area, level);
+				show_node(vty, area, level, algorithm);
 		}
 	}
 

isisd/isis_sr.h

@@ -61,6 +61,11 @@ struct isis_sr_psid_info {
 
 	/* Indicates whether the Prefix-SID is present or not. */
 	bool present;
+
+	uint8_t algorithm;
+
+	struct list *nexthops;
+	struct list *nexthops_backup;
 };
 
 /* Segment Routing Local Block allocation */
@@ -147,6 +152,9 @@ struct sr_prefix_cfg {
 
 	/* Backpointer to IS-IS area. */
 	struct isis_area *area;
+
+	/* SR Algorithm number */
+	uint8_t algorithm;
 };
 
 /* Per-area IS-IS Segment Routing Data Base (SRDB). */
@@ -198,11 +206,13 @@ extern int isis_sr_cfg_srgb_update(struct isis_area *area, uint32_t lower_bound,
 				   uint32_t upper_bound);
 extern int isis_sr_cfg_srlb_update(struct isis_area *area, uint32_t lower_bound,
 				   uint32_t upper_bound);
-extern struct sr_prefix_cfg *
-isis_sr_cfg_prefix_add(struct isis_area *area, const struct prefix *prefix);
+extern struct sr_prefix_cfg *isis_sr_cfg_prefix_add(struct isis_area *area,
+						    const struct prefix *prefix,
+						    uint8_t algorithm);
 extern void isis_sr_cfg_prefix_del(struct sr_prefix_cfg *pcfg);
 extern struct sr_prefix_cfg *
-isis_sr_cfg_prefix_find(struct isis_area *area, union prefixconstptr prefix);
+isis_sr_cfg_prefix_find(struct isis_area *area, union prefixconstptr prefix,
+			uint8_t algorithm);
 extern void isis_sr_prefix_cfg2subtlv(const struct sr_prefix_cfg *pcfg,
 				      bool external,
 				      struct isis_prefix_sid *psid);

isisd/isis_te.c

@@ -164,6 +164,154 @@ void isis_mpls_te_term(struct isis_area *area)
 	XFREE(MTYPE_ISIS_MPLS_TE, area->mta);
 }
 
+static void isis_link_params_update_asla(struct isis_circuit *circuit,
+					 struct interface *ifp)
+{
+	struct isis_asla_subtlvs *asla;
+	struct listnode *node, *nnode;
+	struct isis_ext_subtlvs *ext = circuit->ext;
+	int i;
+
+	if (!HAS_LINK_PARAMS(ifp)) {
+		list_delete_all_node(ext->aslas);
+		return;
+	}
+
+#ifndef FABRICD
+	/* RFC 8919 Application Specific Link-Attributes
+	 * is required by flex-algo application ISIS_SABM_FLAG_X
+	 */
+	if (list_isempty(circuit->area->flex_algos->flex_algos))
+		isis_tlvs_free_asla(ext, ISIS_SABM_FLAG_X);
+	else
+		isis_tlvs_find_alloc_asla(ext, ISIS_SABM_FLAG_X);
+#endif /* ifndef FABRICD */
+
+	if (list_isempty(ext->aslas))
+		return;
+
+	for (ALL_LIST_ELEMENTS(ext->aslas, node, nnode, asla)) {
+		asla->legacy = circuit->area->asla_legacy_flag;
+		RESET_SUBTLV(asla);
+
+		if (asla->legacy)
+			continue;
+
+		/* Fulfill ASLA subTLVs from interface link parameters */
+		if (IS_PARAM_SET(ifp->link_params, LP_ADM_GRP)) {
+			asla->admin_group = ifp->link_params->admin_grp;
+			SET_SUBTLV(asla, EXT_ADM_GRP);
+		} else
+			UNSET_SUBTLV(asla, EXT_ADM_GRP);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_EXTEND_ADM_GRP)) {
+			admin_group_copy(&asla->ext_admin_group,
+					 &ifp->link_params->ext_admin_grp);
+			SET_SUBTLV(asla, EXT_EXTEND_ADM_GRP);
+		} else
+			UNSET_SUBTLV(asla, EXT_EXTEND_ADM_GRP);
+
+		/* Send admin-group zero for better compatibility
+		 * https://www.rfc-editor.org/rfc/rfc7308#section-2.3.2
+		 */
+		if (circuit->area->admin_group_send_zero &&
+		    !IS_SUBTLV(asla, EXT_ADM_GRP) &&
+		    !IS_SUBTLV(asla, EXT_EXTEND_ADM_GRP)) {
+			asla->admin_group = 0;
+			SET_SUBTLV(asla, EXT_ADM_GRP);
+			admin_group_clear(&asla->ext_admin_group);
+			admin_group_allow_explicit_zero(&asla->ext_admin_group);
+			SET_SUBTLV(asla, EXT_EXTEND_ADM_GRP);
+		}
+
+		if (IS_PARAM_SET(ifp->link_params, LP_TE_METRIC)) {
+			asla->te_metric = ifp->link_params->te_metric;
+			SET_SUBTLV(asla, EXT_TE_METRIC);
+		} else
+			UNSET_SUBTLV(asla, EXT_TE_METRIC);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_DELAY)) {
+			asla->delay = ifp->link_params->av_delay;
+			SET_SUBTLV(asla, EXT_DELAY);
+		} else
+			UNSET_SUBTLV(asla, EXT_DELAY);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_MM_DELAY)) {
+			asla->min_delay = ifp->link_params->min_delay;
+			asla->max_delay = ifp->link_params->max_delay;
+			SET_SUBTLV(asla, EXT_MM_DELAY);
+		} else {
+			UNSET_SUBTLV(asla, EXT_MM_DELAY);
+		}
+
+		if (asla->standard_apps == ISIS_SABM_FLAG_X)
+			/* Flex-Algo ASLA does not need the following TE
+			 * sub-TLVs
+			 */
+			continue;
+
+		if (IS_PARAM_SET(ifp->link_params, LP_MAX_BW)) {
+			asla->max_bw = ifp->link_params->max_bw;
+			SET_SUBTLV(asla, EXT_MAX_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_MAX_BW);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_MAX_RSV_BW)) {
+			asla->max_rsv_bw = ifp->link_params->max_rsv_bw;
+			SET_SUBTLV(asla, EXT_MAX_RSV_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_MAX_RSV_BW);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_UNRSV_BW)) {
+			for (i = 0; i < MAX_CLASS_TYPE; i++)
+				asla->unrsv_bw[i] =
+					ifp->link_params->unrsv_bw[i];
+			SET_SUBTLV(asla, EXT_UNRSV_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_UNRSV_BW);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_DELAY_VAR)) {
+			asla->delay_var = ifp->link_params->delay_var;
+			SET_SUBTLV(asla, EXT_DELAY_VAR);
+		} else
+			UNSET_SUBTLV(asla, EXT_DELAY_VAR);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_PKT_LOSS)) {
+			asla->pkt_loss = ifp->link_params->pkt_loss;
+			SET_SUBTLV(asla, EXT_PKT_LOSS);
+		} else
+			UNSET_SUBTLV(asla, EXT_PKT_LOSS);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_RES_BW)) {
+			asla->res_bw = ifp->link_params->res_bw;
+			SET_SUBTLV(asla, EXT_RES_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_RES_BW);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_AVA_BW)) {
+			asla->ava_bw = ifp->link_params->ava_bw;
+			SET_SUBTLV(asla, EXT_AVA_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_AVA_BW);
+
+		if (IS_PARAM_SET(ifp->link_params, LP_USE_BW)) {
+			asla->use_bw = ifp->link_params->use_bw;
+			SET_SUBTLV(asla, EXT_USE_BW);
+		} else
+			UNSET_SUBTLV(asla, EXT_USE_BW);
+	}
+
+
+	for (ALL_LIST_ELEMENTS(ext->aslas, node, nnode, asla)) {
+		if (!asla->legacy && NO_SUBTLV(asla) &&
+		    admin_group_nb_words(&asla->ext_admin_group) == 0)
+			/* remove ASLA without info from the list of ASLAs to
+			 * not send void ASLA
+			 */
+			isis_tlvs_del_asla_flex_algo(ext, asla);
+	}
+}
+
 /* Main initialization / update function of the MPLS TE Circuit context */
 /* Call when interface TE Link parameters are modified */
 void isis_link_params_update(struct isis_circuit *circuit,
@@ -210,6 +358,19 @@ void isis_link_params_update(struct isis_circuit *circuit,
 		} else
 			UNSET_SUBTLV(ext, EXT_EXTEND_ADM_GRP);
 
+		/* Send admin-group zero for better compatibility
+		 * https://www.rfc-editor.org/rfc/rfc7308#section-2.3.2
+		 */
+		if (circuit->area->admin_group_send_zero &&
+		    !IS_SUBTLV(ext, EXT_ADM_GRP) &&
+		    !IS_SUBTLV(ext, EXT_EXTEND_ADM_GRP)) {
+			ext->adm_group = 0;
+			SET_SUBTLV(ext, EXT_ADM_GRP);
+			admin_group_clear(&ext->ext_admin_group);
+			admin_group_allow_explicit_zero(&ext->ext_admin_group);
+			SET_SUBTLV(ext, EXT_EXTEND_ADM_GRP);
+		}
+
 		/* If known, register local IPv4 addr from ip_addr list */
 		if (listcount(circuit->ip_addrs) != 0) {
 			addr = (struct prefix_ipv4 *)listgetdata(
@@ -331,6 +492,8 @@ void isis_link_params_update(struct isis_circuit *circuit,
 			ext->status = 0;
 	}
 
+	isis_link_params_update_asla(circuit, ifp);
+
 	return;
 }
 
@@ -503,7 +666,12 @@ int isis_mpls_te_update(struct interface *ifp)
 	isis_link_params_update(circuit, ifp);
 
 	/* ... and LSP */
-	if (circuit->area && IS_MPLS_TE(circuit->area->mta))
+	if (circuit->area &&
+	    (IS_MPLS_TE(circuit->area->mta)
+#ifndef FABRICD
+	     || !list_isempty(circuit->area->flex_algos->flex_algos)
+#endif /* ifndef FABRICD */
+		     ))
 		lsp_regenerate_schedule(circuit->area, circuit->is_type, 0);
 
 	rc = 0;
@@ -611,7 +779,7 @@ static struct ls_vertex *lsp_to_vertex(struct ls_ted *ted, struct isis_lsp *lsp)
 				lnode.srgb.flag = cap->srgb.flags;
 				lnode.srgb.lower_bound = cap->srgb.lower_bound;
 				lnode.srgb.range_size = cap->srgb.range_size;
-				for (int i = 0; i < SR_ALGORITHM_COUNT; i++)
+				for (int i = 0; i < LIB_LS_SR_ALGO_COUNT; i++)
 					lnode.algo[i] = cap->algo[i];
 			}
 

isisd/isis_tlvs.h

@@ -9,8 +9,12 @@
 #ifndef ISIS_TLVS_H
 #define ISIS_TLVS_H
 
+#include "segment_routing.h"
 #include "openbsd-tree.h"
 #include "prefix.h"
+#include "flex_algo.h"
+#include "affinitymap.h"
+
 
 DECLARE_MTYPE(ISIS_SUBTLV);
 
@@ -102,7 +106,7 @@ struct isis_spine_leaf {
 enum isis_threeway_state {
 	ISIS_THREEWAY_DOWN = 2,
 	ISIS_THREEWAY_INITIALIZING = 1,
-	ISIS_THREEWAY_UP = 0
+	ISIS_THREEWAY_UP = 0,
 };
 
 struct isis_threeway_adj {
@@ -177,19 +181,18 @@ struct isis_lan_adj_sid {
 #define ISIS_ROUTER_CAP_FLAG_D	0x02
 #define ISIS_ROUTER_CAP_SIZE	5
 
-/* Number of supported algorithm for Segment Routing.
- * Right now only 2 have been standardized:
- *  - 0: SPF
- *  - 1: Strict SPF
- */
-#define SR_ALGORITHM_COUNT	2
-#define SR_ALGORITHM_SPF	0
-#define SR_ALGORITHM_STRICT_SPF	1
-#define SR_ALGORITHM_UNSET	255
-
 #define MSD_TYPE_BASE_MPLS_IMPOSITION  0x01
 #define MSD_TLV_SIZE            2
 
+#ifndef FABRICD
+struct isis_router_cap_fad;
+struct isis_router_cap_fad {
+	uint8_t sysid[ISIS_SYS_ID_LEN + 2];
+
+	struct flex_algo fad;
+};
+#endif /* ifndef FABRICD */
+
 struct isis_router_cap {
 	struct in_addr router_id;
 	uint8_t flags;
@@ -200,6 +203,11 @@ struct isis_router_cap {
 	uint8_t algo[SR_ALGORITHM_COUNT];
 	/* RFC 8491 */
 	uint8_t msd;
+
+#ifndef FABRICD
+	/* RFC9350 Flex-Algorithm */
+	struct isis_router_cap_fad *fads[SR_ALGORITHM_COUNT];
+#endif /* ifndef FABRICD */
 };
 
 struct isis_item {
@@ -309,7 +317,7 @@ enum isis_tlv_context {
 	ISIS_CONTEXT_SUBTLV_NE_REACH,
 	ISIS_CONTEXT_SUBTLV_IP_REACH,
 	ISIS_CONTEXT_SUBTLV_IPV6_REACH,
-	ISIS_CONTEXT_MAX
+	ISIS_CONTEXT_MAX,
 };
 
 struct isis_subtlvs {
@@ -394,7 +402,22 @@ enum isis_tlv_type {
 	ISIS_SUBTLV_AVA_BW = 38,
 	ISIS_SUBTLV_USE_BW = 39,
 
-	ISIS_SUBTLV_MAX = 40
+	/* RFC 7308 */
+	ISIS_SUBTLV_EXT_ADMIN_GRP = 14,
+
+	/* RFC 8919 */
+	ISIS_SUBTLV_ASLA = 16,
+
+	/* draft-ietf-lsr-isis-srv6-extensions */
+	ISIS_SUBTLV_SID_END = 5,
+	ISIS_SUBTLV_SID_END_X = 43,
+
+	ISIS_SUBTLV_MAX = 40,
+
+	/* draft-ietf-lsr-isis-srv6-extensions */
+	ISIS_SUBSUBTLV_SID_STRUCTURE = 1,
+
+	ISIS_SUBSUBTLV_MAX = 256,
 };
 
 /* subTLVs size for TE and SR */
@@ -422,19 +445,39 @@ enum ext_subtlv_size {
 	/* RFC 7810 */
 	ISIS_SUBTLV_MM_DELAY_SIZE = 8,
 
+	/* RFC9350 - Flex-Algorithm */
+	ISIS_SUBTLV_FAD = 26,
+	ISIS_SUBTLV_FAD_MIN_SIZE = 4,
+
 	ISIS_SUBTLV_HDR_SIZE = 2,
 	ISIS_SUBTLV_DEF_SIZE = 4,
 
-	/* RFC 7308 */
-	ISIS_SUBTLV_EXT_ADMIN_GRP = 14,
+	ISIS_SUBTLV_MAX_SIZE = 180,
 
-	ISIS_SUBTLV_MAX_SIZE = 180
+	/* draft-ietf-lsr-isis-srv6-extensions */
+	ISIS_SUBSUBTLV_SID_STRUCTURE_SIZE = 4,
+
+	ISIS_SUBSUBTLV_HDR_SIZE = 2,
+	ISIS_SUBSUBTLV_MAX_SIZE = 180,
+
+	/* RFC9350 - Flex-Algorithm */
+	ISIS_SUBTLV_FAD_SUBSUBTLV_FLAGS_SIZE = 1,
+};
+
+enum ext_subsubtlv_types {
+	ISIS_SUBTLV_FAD_SUBSUBTLV_EXCAG = 1,
+	ISIS_SUBTLV_FAD_SUBSUBTLV_INCANYAG = 2,
+	ISIS_SUBTLV_FAD_SUBSUBTLV_INCALLAG = 3,
+	ISIS_SUBTLV_FAD_SUBSUBTLV_FLAGS = 4,
+	ISIS_SUBTLV_FAD_SUBSUBTLV_ESRLG = 5,
 };
 
 /* Macros to manage the optional presence of EXT subTLVs */
 #define SET_SUBTLV(s, t) ((s->status) |= (t))
 #define UNSET_SUBTLV(s, t) ((s->status) &= ~(t))
 #define IS_SUBTLV(s, t) (s->status & t)
+#define RESET_SUBTLV(s) (s->status = 0)
+#define NO_SUBTLV(s) (s->status == 0)
 
 #define EXT_DISABLE		0x000000
 #define EXT_ADM_GRP		0x000001
@@ -506,6 +549,45 @@ struct isis_ext_subtlvs {
 	/* Segment Routing Adjacency & LAN Adjacency Segment ID */
 	struct isis_item_list adj_sid;
 	struct isis_item_list lan_sid;
+
+	struct list *aslas;
+};
+
+/* RFC 8919 */
+#define ISIS_SABM_FLAG_R 0x80 /* RSVP-TE */
+#define ISIS_SABM_FLAG_S 0x40 /* Segment Routing Policy */
+#define ISIS_SABM_FLAG_L 0x20 /* Loop-Free Alternate */
+#define ISIS_SABM_FLAG_X 0x10 /* Flex-Algorithm - RFC9350 */
+
+#define ASLA_APP_IDENTIFIER_BIT_LENGTH 1
+#define ASLA_LEGACY_FLAG 0x80
+#define ASLA_APPS_LENGTH_MASK 0x7f
+
+struct isis_asla_subtlvs {
+	uint32_t status;
+
+	/* Application Specific Link Attribute - RFC 8919 */
+	bool legacy; /* L-Flag */
+	uint8_t standard_apps_length;
+	uint8_t user_def_apps_length;
+	uint8_t standard_apps;
+	uint8_t user_def_apps;
+
+	/* Sub-TLV list - rfc8919 section-3.1 */
+	uint32_t admin_group;
+	struct admin_group ext_admin_group; /* Res. Class/Color - RFC 7308 */
+	float max_bw;			    /* Maximum Bandwidth - RFC 5305 */
+	float max_rsv_bw;   /* Maximum Reservable Bandwidth - RFC 5305 */
+	float unrsv_bw[8];  /* Unreserved Bandwidth - RFC 5305 */
+	uint32_t te_metric; /* Traffic Engineering Metric - RFC 5305 */
+	uint32_t delay;     /* Average Link Delay  - RFC 8570 */
+	uint32_t min_delay; /* Low Link Delay  - RFC 8570 */
+	uint32_t max_delay; /* High Link Delay  - RFC 8570 */
+	uint32_t delay_var; /* Link Delay Variation i.e. Jitter - RFC 8570 */
+	uint32_t pkt_loss;  /* Unidirectional Link Packet Loss - RFC 8570 */
+	float res_bw;       /* Unidirectional Residual Bandwidth - RFC 8570 */
+	float ava_bw;       /* Unidirectional Available Bandwidth - RFC 8570 */
+	float use_bw;       /* Unidirectional Utilized Bandwidth - RFC 8570 */
 };
 
 #define IS_COMPAT_MT_TLV(tlv_type)                                             \
@@ -536,6 +618,12 @@ struct list *isis_fragment_tlvs(struct isis_tlvs *tlvs, size_t size);
 #define ISIS_MT_AT_MASK        0x4000
 #endif
 
+/* RFC 8919 */
+#define ISIS_SABM_FLAG_R 0x80 /* RSVP-TE */
+#define ISIS_SABM_FLAG_S 0x40 /* Segment Routing Policy */
+#define ISIS_SABM_FLAG_L 0x20 /* Loop-Free Alternate */
+#define ISIS_SABM_FLAG_X 0x10 /* Flex-Algorithm - RFC9350 */
+
 void isis_tlvs_add_auth(struct isis_tlvs *tlvs, struct isis_passwd *passwd);
 void isis_tlvs_add_area_addresses(struct isis_tlvs *tlvs,
 				  struct list *addresses);
@@ -567,8 +655,19 @@ void isis_tlvs_add_csnp_entries(struct isis_tlvs *tlvs, uint8_t *start_id,
 				struct isis_lsp **last_lsp);
 void isis_tlvs_set_dynamic_hostname(struct isis_tlvs *tlvs,
 				    const char *hostname);
-void isis_tlvs_set_router_capability(struct isis_tlvs *tlvs,
-                     const struct isis_router_cap *cap);
+struct isis_router_cap *
+isis_tlvs_init_router_capability(struct isis_tlvs *tlvs);
+
+struct isis_area;
+struct isis_flex_algo;
+void isis_tlvs_set_router_capability_fad(struct isis_tlvs *tlvs,
+					 struct flex_algo *fa, int algorithm,
+					 uint8_t *sysid);
+
+struct isis_area;
+
+int isis_tlvs_sr_algo_count(const struct isis_router_cap *cap);
+
 void isis_tlvs_set_te_router_id(struct isis_tlvs *tlvs,
 				const struct in_addr *id);
 void isis_tlvs_set_te_router_id_ipv6(struct isis_tlvs *tlvs,
@@ -577,10 +676,11 @@ void isis_tlvs_add_oldstyle_ip_reach(struct isis_tlvs *tlvs,
 				     struct prefix_ipv4 *dest, uint8_t metric);
 void isis_tlvs_add_extended_ip_reach(struct isis_tlvs *tlvs,
 				     struct prefix_ipv4 *dest, uint32_t metric,
-				     bool external, struct sr_prefix_cfg *pcfg);
+				     bool external,
+				     struct sr_prefix_cfg **pcfgs);
 void isis_tlvs_add_ipv6_reach(struct isis_tlvs *tlvs, uint16_t mtid,
 			      struct prefix_ipv6 *dest, uint32_t metric,
-			      bool external, struct sr_prefix_cfg *pcfg);
+			      bool external, struct sr_prefix_cfg **pcfgs);
 void isis_tlvs_add_ipv6_dstsrc_reach(struct isis_tlvs *tlvs, uint16_t mtid,
 				     struct prefix_ipv6 *dest,
 				     struct prefix_ipv6 *src,
@@ -596,6 +696,12 @@ void isis_tlvs_add_lan_adj_sid(struct isis_ext_subtlvs *exts,
 void isis_tlvs_del_lan_adj_sid(struct isis_ext_subtlvs *exts,
 			       struct isis_lan_adj_sid *lan);
 
+void isis_tlvs_del_asla_flex_algo(struct isis_ext_subtlvs *ext,
+				  struct isis_asla_subtlvs *asla);
+struct isis_asla_subtlvs *
+isis_tlvs_find_alloc_asla(struct isis_ext_subtlvs *ext, uint8_t standard_apps);
+void isis_tlvs_free_asla(struct isis_ext_subtlvs *ext, uint8_t standard_apps);
+
 void isis_tlvs_add_oldstyle_reach(struct isis_tlvs *tlvs, uint8_t *id,
 				  uint8_t metric);
 void isis_tlvs_add_extended_reach(struct isis_tlvs *tlvs, uint16_t mtid,

isisd/isis_zebra.c

@@ -327,14 +327,13 @@ void isis_zebra_route_del_route(struct isis *isis,
  */
 void isis_zebra_prefix_sid_install(struct isis_area *area,
 				   struct prefix *prefix,
-				   struct isis_route_info *rinfo,
 				   struct isis_sr_psid_info *psid)
 {
 	struct zapi_labels zl;
 	int count = 0;
 
-	sr_debug("ISIS-Sr (%s): update label %u for prefix %pFX",
-		 area->area_tag, psid->label, prefix);
+	sr_debug("ISIS-Sr (%s): update label %u for prefix %pFX algorithm %u",
+		 area->area_tag, psid->label, prefix, psid->algorithm);
 
 	/* Prepare message. */
 	memset(&zl, 0, sizeof(zl));
@@ -342,7 +341,7 @@ void isis_zebra_prefix_sid_install(struct isis_area *area,
 	zl.local_label = psid->label;
 
 	/* Local routes don't have any nexthop and require special handling. */
-	if (list_isempty(rinfo->nexthops)) {
+	if (list_isempty(psid->nexthops)) {
 		struct zapi_nexthop *znh;
 		struct interface *ifp;
 
@@ -361,9 +360,9 @@ void isis_zebra_prefix_sid_install(struct isis_area *area,
 		znh->labels[0] = MPLS_LABEL_IMPLICIT_NULL;
 	} else {
 		/* Add backup nexthops first. */
-		if (rinfo->backup) {
+		if (psid->nexthops_backup) {
 			count = isis_zebra_add_nexthops(
-				area->isis, rinfo->backup->nexthops,
+				area->isis, psid->nexthops_backup,
 				zl.backup_nexthops, ISIS_NEXTHOP_BACKUP, true,
 				0);
 			if (count > 0) {
@@ -373,7 +372,7 @@ void isis_zebra_prefix_sid_install(struct isis_area *area,
 		}
 
 		/* Add primary nexthops. */
-		count = isis_zebra_add_nexthops(area->isis, rinfo->nexthops,
+		count = isis_zebra_add_nexthops(area->isis, psid->nexthops,
 						zl.nexthops, ISIS_NEXTHOP_MAIN,
 						true, count);
 		if (!count)
@@ -400,8 +399,8 @@ void isis_zebra_prefix_sid_uninstall(struct isis_area *area,
 {
 	struct zapi_labels zl;
 
-	sr_debug("ISIS-Sr (%s): delete label %u for prefix %pFX",
-		 area->area_tag, psid->label, prefix);
+	sr_debug("ISIS-Sr (%s): delete label %u for prefix %pFX algorithm %u",
+		 area->area_tag, psid->label, prefix, psid->algorithm);
 
 	/* Prepare message. */
 	memset(&zl, 0, sizeof(zl));

isisd/isis_zebra.h

@@ -36,7 +36,6 @@ void isis_zebra_route_del_route(struct isis *isis,
 				struct isis_route_info *route_info);
 void isis_zebra_prefix_sid_install(struct isis_area *area,
 				   struct prefix *prefix,
-				   struct isis_route_info *rinfo,
 				   struct isis_sr_psid_info *psid);
 void isis_zebra_prefix_sid_uninstall(struct isis_area *area,
 				     struct prefix *prefix,

isisd/isisd.c

@@ -27,6 +27,7 @@
 #include "zclient.h"
 #include "vrf.h"
 #include "spf_backoff.h"
+#include "flex_algo.h"
 #include "lib/northbound_cli.h"
 #include "bfd.h"
 
@@ -49,6 +50,7 @@
 #include "isisd/isis_te.h"
 #include "isisd/isis_mt.h"
 #include "isisd/isis_sr.h"
+#include "isisd/isis_flex_algo.h"
 #include "isisd/fabricd.h"
 #include "isisd/isis_nb.h"
 
@@ -317,6 +319,12 @@ struct isis_area *isis_area_create(const char *area_tag, const char *vrf_name)
 	if (area->is_type & IS_LEVEL_2)
 		lsp_db_init(&area->lspdb[1]);
 
+#ifndef FABRICD
+	/* Flex-Algo */
+	area->flex_algos = flex_algos_alloc(isis_flex_algo_data_alloc,
+					    isis_flex_algo_data_free);
+#endif /* ifndef FABRICD */
+
 	spftree_area_init(area);
 
 	area->circuit_list = list_new();
@@ -3061,12 +3069,27 @@ int isis_area_passwd_hmac_md5_set(struct isis_area *area, int level,
 
 void isis_area_invalidate_routes(struct isis_area *area, int levels)
 {
+#ifndef FABRICD
+	struct flex_algo *fa;
+	struct listnode *node;
+	struct isis_flex_algo_data *data;
+#endif /* ifndef FABRICD */
+
 	for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
 		if (!(level & levels))
 			continue;
 		for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
 			isis_spf_invalidate_routes(
 					area->spftree[tree][level - 1]);
+
+#ifndef FABRICD
+			for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos,
+						  node, fa)) {
+				data = fa->data;
+				isis_spf_invalidate_routes(
+					data->spftree[tree][level - 1]);
+			}
+#endif /* ifndef FABRICD */
 		}
 	}
 }
@@ -3074,7 +3097,7 @@ void isis_area_invalidate_routes(struct isis_area *area, int levels)
 void isis_area_verify_routes(struct isis_area *area)
 {
 	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++)
-		isis_spf_verify_routes(area, area->spftree[tree]);
+		isis_spf_verify_routes(area, area->spftree[tree], tree);
 }
 
 void isis_area_switchover_routes(struct isis_area *area, int family,
@@ -3098,6 +3121,12 @@ void isis_area_switchover_routes(struct isis_area *area, int family,
 
 static void area_resign_level(struct isis_area *area, int level)
 {
+#ifndef FABRICD
+	struct flex_algo *fa;
+	struct listnode *node;
+	struct isis_flex_algo_data *data;
+#endif /* ifndef FABRICD */
+
 	isis_area_invalidate_routes(area, level);
 	isis_area_verify_routes(area);
 
@@ -3110,6 +3139,20 @@ static void area_resign_level(struct isis_area *area, int level)
 		}
 	}
 
+#ifndef FABRICD
+	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
+		for (ALL_LIST_ELEMENTS_RO(area->flex_algos->flex_algos, node,
+					  fa)) {
+			data = fa->data;
+			if (data->spftree[level - 1]) {
+				isis_spftree_del(
+					data->spftree[tree][level - 1]);
+				data->spftree[tree][level - 1] = NULL;
+			}
+		}
+	}
+#endif /* ifndef FABRICD */
+
 	if (area->spf_timer[level - 1])
 		isis_spf_timer_free(EVENT_ARG(area->spf_timer[level - 1]));
 
@@ -3748,7 +3791,8 @@ struct cmd_node router_node = {
 	.prompt = "%s(config-router)# ",
 	.config_write = isis_config_write,
 };
-#else
+#endif /* ifdef FABRICD */
+#ifndef FABRICD
 /* IS-IS configuration write function */
 static int isis_config_write(struct vty *vty)
 {
@@ -3771,7 +3815,14 @@ struct cmd_node router_node = {
 	.prompt = "%s(config-router)# ",
 	.config_write = isis_config_write,
 };
-#endif /* ifdef FABRICD */
+
+struct cmd_node isis_flex_algo_node = {
+	.name = "isis-flex-algo",
+	.node = ISIS_FLEX_ALGO_NODE,
+	.parent_node = ISIS_NODE,
+	.prompt = "%s(config-router-flex-algo)# ",
+};
+#endif /* ifdnef FABRICD */
 
 void isis_init(void)
 {
@@ -3880,6 +3931,10 @@ void isis_init(void)
 	install_element(ROUTER_NODE, &log_adj_changes_cmd);
 	install_element(ROUTER_NODE, &no_log_adj_changes_cmd);
 #endif /* ifdef FABRICD */
+#ifndef FABRICD
+	install_node(&isis_flex_algo_node);
+	install_default(ISIS_FLEX_ALGO_NODE);
+#endif /* ifdnef FABRICD */
 
 	spf_backoff_cmd_init();
 }

isisd/isisd.h

@@ -163,6 +163,10 @@ struct isis_area {
 	/* do we support new style metrics?  */
 	char newmetric;
 	char oldmetric;
+	/* Allow sending the default admin-group value of 0x00000000. */
+	bool admin_group_send_zero;
+	/* Set the legacy flag (aka. L-FLAG) in the ASLA Sub-TLV */
+	bool asla_legacy_flag;
 	/* identifies the routing instance   */
 	char *area_tag;
 	/* area addresses for this area      */
@@ -220,6 +224,10 @@ struct isis_area {
 	size_t tilfa_protected_links[ISIS_LEVELS];
 	/* MPLS LDP-IGP Sync */
 	struct ldp_sync_info_cmd ldp_sync_cmd;
+#ifndef FABRICD
+	/* Flex-Algo */
+	struct flex_algos *flex_algos;
+#endif /* ifndef FABRICD */
 	/* Counters */
 	uint32_t circuit_state_changes;
 	struct isis_redist redist_settings[REDIST_PROTOCOL_COUNT]

isisd/subdir.am

@@ -19,6 +19,7 @@ vtysh_daemons += fabricd
 endif
 
 noinst_HEADERS += \
+	isisd/isis_affinitymap.h \
 	isisd/isis_adjacency.h \
 	isisd/isis_bfd.h \
 	isisd/isis_circuit.h \
@@ -45,6 +46,7 @@ noinst_HEADERS += \
 	isisd/isis_spf.h \
 	isisd/isis_spf_private.h \
 	isisd/isis_sr.h \
+	isisd/isis_flex_algo.h \
 	isisd/isis_te.h \
 	isisd/isis_tlvs.h \
 	isisd/isis_tx_queue.h \
@@ -55,6 +57,7 @@ noinst_HEADERS += \
 	# end
 
 LIBISIS_SOURCES = \
+	isisd/isis_affinitymap.c \
 	isisd/isis_adjacency.c \
 	isisd/isis_bfd.c \
 	isisd/isis_circuit.c \
@@ -76,6 +79,7 @@ LIBISIS_SOURCES = \
 	isisd/isis_routemap.c \
 	isisd/isis_spf.c \
 	isisd/isis_sr.c \
+	isisd/isis_flex_algo.c \
 	isisd/isis_te.c \
 	isisd/isis_tlvs.c \
 	isisd/isis_tx_queue.c \

lib/command.h

@@ -129,6 +129,7 @@ enum node_type {
 	LDP_L2VPN_NODE,		 /* LDP L2VPN node */
 	LDP_PSEUDOWIRE_NODE,     /* LDP Pseudowire node */
 	ISIS_NODE,		 /* ISIS protocol mode */
+	ISIS_FLEX_ALGO_NODE,    /* ISIS Flex Algo mode */
 	ACCESS_NODE,		 /* Access list node. */
 	PREFIX_NODE,		 /* Prefix list node. */
 	ACCESS_IPV6_NODE,	/* Access list node. */

lib/flex_algo.c

@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * flex_algo.c: Flexible Algorithm library
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#include "zebra.h"
+
+#include "flex_algo.h"
+
+DEFINE_MTYPE_STATIC(LIB, FLEX_ALGO, "Flex-Algo Definition");
+
+struct flex_algos *flex_algos_alloc(flex_algo_allocator_t allocator,
+				    flex_algo_releaser_t releaser)
+{
+	struct flex_algos *flex_algos;
+
+	flex_algos = XCALLOC(MTYPE_FLEX_ALGO, sizeof(*flex_algos));
+	flex_algos->flex_algos = list_new();
+	flex_algos->allocator = allocator;
+	flex_algos->releaser = releaser;
+	return flex_algos;
+}
+
+struct flex_algo *flex_algo_alloc(struct flex_algos *flex_algos,
+				  uint8_t algorithm, void *arg)
+{
+	struct flex_algo *fa;
+
+	fa = XCALLOC(MTYPE_FLEX_ALGO, sizeof(*fa));
+	fa->algorithm = algorithm;
+	if (flex_algos->allocator)
+		fa->data = flex_algos->allocator(arg);
+	admin_group_init(&fa->admin_group_exclude_any);
+	admin_group_init(&fa->admin_group_include_any);
+	admin_group_init(&fa->admin_group_include_all);
+	listnode_add(flex_algos->flex_algos, fa);
+	return fa;
+}
+
+/**
+ * @brief Look up the local flex-algo object by its algorithm number.
+ * @param algorithm flex-algo algorithm number
+ * @param area area pointer of flex-algo
+ * @return local flex-algo object if exist, else NULL
+ */
+struct flex_algo *flex_algo_lookup(struct flex_algos *flex_algos,
+				   uint8_t algorithm)
+{
+	struct listnode *node;
+	struct flex_algo *fa;
+
+	for (ALL_LIST_ELEMENTS_RO(flex_algos->flex_algos, node, fa))
+		if (fa->algorithm == algorithm)
+			return fa;
+	return NULL;
+}
+
+/**
+ * @brief Compare two Flex-Algo Definitions (FAD)
+ * @param Flex algo 1
+ * @param Flex algo 2
+ * @return true if the definition is equal, else false
+ */
+bool flex_algo_definition_cmp(struct flex_algo *fa1, struct flex_algo *fa2)
+{
+	if (fa1->algorithm != fa2->algorithm)
+		return false;
+	if (fa1->calc_type != fa2->calc_type)
+		return false;
+	if (fa1->metric_type != fa2->metric_type)
+		return false;
+
+	if (!admin_group_cmp(&fa1->admin_group_exclude_any,
+			     &fa2->admin_group_exclude_any))
+		return false;
+	if (!admin_group_cmp(&fa1->admin_group_include_all,
+			     &fa2->admin_group_include_all))
+		return false;
+	if (!admin_group_cmp(&fa1->admin_group_include_any,
+			     &fa2->admin_group_include_any))
+		return false;
+
+	return true;
+}
+
+void flex_algo_delete(struct flex_algos *flex_algos, uint8_t algorithm)
+{
+	struct listnode *node, *nnode;
+	struct flex_algo *fa;
+
+	for (ALL_LIST_ELEMENTS(flex_algos->flex_algos, node, nnode, fa)) {
+		if (fa->algorithm != algorithm)
+			continue;
+		if (flex_algos->releaser)
+			flex_algos->releaser(fa->data);
+		admin_group_term(&fa->admin_group_exclude_any);
+		admin_group_term(&fa->admin_group_include_any);
+		admin_group_term(&fa->admin_group_include_all);
+		listnode_delete(flex_algos->flex_algos, fa);
+		XFREE(MTYPE_FLEX_ALGO, fa);
+		return;
+	}
+}
+
+/**
+ * Check SR Algorithm is Flex-Algo
+ * according to RFC9350 section 4
+ *
+ * @param algorithm SR Algorithm
+ */
+bool flex_algo_id_valid(uint16_t algorithm)
+{
+	return algorithm >= SR_ALGORITHM_FLEX_MIN &&
+	       algorithm <= SR_ALGORITHM_FLEX_MAX;
+}
+
+char *flex_algo_metric_type_print(char *type_str, size_t sz,
+				  enum flex_algo_metric_type metric_type)
+{
+	switch (metric_type) {
+	case MT_IGP:
+		snprintf(type_str, sz, "igp");
+		break;
+	case MT_MIN_UNI_LINK_DELAY:
+		snprintf(type_str, sz, "delay");
+		break;
+	case MT_TE_DEFAULT:
+		snprintf(type_str, sz, "te");
+		break;
+	}
+	return type_str;
+}

lib/flex_algo.h

@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * flex_algo.h: Flexible Algorithm library
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#ifndef _FRR_FLEX_ALGO_H
+#define _FRR_FLEX_ALGO_H
+
+#include "admin_group.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "segment_routing.h"
+
+#define FLEX_ALGO_PRIO_DEFAULT 128
+
+#define CALC_TYPE_SPF 0
+
+/* flex-algo definition flags */
+
+/* M-flag (aka. prefix-metric)
+ * Flex-Algorithm specific prefix and ASBR metric MUST be used
+ */
+#define FAD_FLAG_M 0x80
+
+/*
+ * Metric Type values from RFC9350 section 5.1
+ */
+enum flex_algo_metric_type {
+	MT_IGP = 0,
+	MT_MIN_UNI_LINK_DELAY = 1,
+	MT_TE_DEFAULT = 2,
+};
+
+
+/* Flex-Algo data about a given algorithm.
+ * It includes the definition and some local data.
+ */
+struct flex_algo {
+	/* Flex-Algo definition */
+	uint8_t algorithm;
+	enum flex_algo_metric_type metric_type;
+	uint8_t calc_type;
+	uint8_t priority;
+	uint8_t flags;
+
+	/* extended admin-groups */
+	struct admin_group admin_group_exclude_any;
+	struct admin_group admin_group_include_any;
+	struct admin_group admin_group_include_all;
+
+	/* Exclude SRLG Sub-TLV is not yet supported by IS-IS
+	 * True if a Exclude SRLG Sub-TLV has been found
+	 */
+	bool exclude_srlg;
+
+	/* True if an unsupported sub-TLV other Exclude SRLG
+	 * has been received.
+	 * A router that receives an unsupported definition
+	 * that is elected must not participate in the algorithm.
+	 * This boolean prevents future sub-TLV from being considered
+	 * as supported.
+	 */
+	bool unsupported_subtlv;
+
+	/* Flex-Algo local data */
+
+	/* True if the local definition must be advertised */
+	bool advertise_definition;
+
+	/* which dataplane must be used for the algorithm */
+#define FLEX_ALGO_SR_MPLS 0x01
+#define FLEX_ALGO_SRV6 0x02
+#define FLEX_ALGO_IP 0x04
+	uint8_t dataplanes;
+
+	/*
+	 * This property can be freely extended among different routing
+	 * protocols. Since Flex-Algo is an IGP protocol agnostic, both IS-IS
+	 * and OSPF can implement Flex-Algo. The struct flex_algo thus provides
+	 * the general data structure of Flex-Algo, and the value of extending
+	 * it with the IGP protocol is provided by this property.
+	 */
+	void *data;
+};
+
+typedef void *(*flex_algo_allocator_t)(void *);
+typedef void (*flex_algo_releaser_t)(void *);
+
+struct flex_algos {
+	flex_algo_allocator_t allocator;
+	flex_algo_releaser_t releaser;
+	struct list *flex_algos;
+};
+
+/*
+ * Flex-Algo Utilities
+ */
+struct flex_algos *flex_algos_alloc(flex_algo_allocator_t allocator,
+				    flex_algo_releaser_t releaser);
+struct flex_algo *flex_algo_alloc(struct flex_algos *flex_algos,
+				  uint8_t algorithm, void *arg);
+struct flex_algo *flex_algo_lookup(struct flex_algos *flex_algos,
+				   uint8_t algorithm);
+void flex_algos_free(struct flex_algos *flex_algos);
+bool flex_algo_definition_cmp(struct flex_algo *fa1, struct flex_algo *fa2);
+void flex_algo_delete(struct flex_algos *flex_algos, uint8_t algorithm);
+bool flex_algo_id_valid(uint16_t algorithm);
+char *flex_algo_metric_type_print(char *type_str, size_t sz,
+				  enum flex_algo_metric_type metric_type);
+
+#endif /* _FRR_FLEX_ALGO_H */

lib/link_state.h

@@ -92,6 +92,9 @@ struct ls_node_id {
  */
 extern int ls_node_id_same(struct ls_node_id i1, struct ls_node_id i2);
 
+/* Supported number of algorithm by the link-state library */
+#define LIB_LS_SR_ALGO_COUNT 2
+
 /* Link State flags to indicate which Node parameters are valid */
 #define LS_NODE_UNSET		0x0000
 #define LS_NODE_NAME		0x0001
@@ -123,7 +126,7 @@ struct ls_node {
 		uint32_t lower_bound;		/* MPLS label lower bound */
 		uint32_t range_size;		/* MPLS label range size */
 	} srlb;
-	uint8_t algo[2];		/* Segment Routing Algorithms */
+	uint8_t algo[LIB_LS_SR_ALGO_COUNT]; /* Segment Routing Algorithms */
 	uint8_t msd;			/* Maximum Stack Depth */
 };
 

lib/segment_routing.c

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * segment_routing.c: Segment-Routing Library
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#include "segment_routing.h"
+
+const char *sr_algorithm_string(uint8_t algo)
+{
+	switch (algo) {
+	case SR_ALGORITHM_SPF:
+		return "SPF";
+	case SR_ALGORITHM_STRICT_SPF:
+		return "Strict SPF";
+	case SR_ALGORITHM_UNSET:
+		return "Unset";
+	default:
+		return algo >= SR_ALGORITHM_FLEX_MIN ? "Flex-Algo" : "Unknown";
+	}
+}

lib/segment_routing.h

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*********************************************************************
+ * Copyright 2022 Hiroki Shirokura, LINE Corporation
+ * Copyright 2022 Masakazu Asama
+ * Copyright 2022 6WIND S.A.
+ *
+ * segment_routing.h: Segment-Routing Library
+ *
+ * Authors
+ * -------
+ * Hiroki Shirokura
+ * Masakazu Asama
+ * Louis Scalbert
+ */
+
+#ifndef _FRR_SR_H
+#define _FRR_SR_H
+
+#include <zebra.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * IGP Algorithm Types
+ * https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml
+ */
+#define SR_ALGORITHM_SPF 0	/* RFC8665 */
+#define SR_ALGORITHM_STRICT_SPF 1 /* RFC8665 */
+#define SR_ALGORITHM_UNSET 127    /* FRRouting defined */
+#define SR_ALGORITHM_FLEX_MIN 128 /* RFC9350 Flex-Algorithm */
+#define SR_ALGORITHM_FLEX_MAX 255 /* RFC9350 Flex-Algorithm */
+#define SR_ALGORITHM_COUNT 256
+
+const char *sr_algorithm_string(uint8_t algo);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _FRR_SR_H */

lib/subdir.am

@@ -33,6 +33,7 @@ lib_libfrr_la_SOURCES = \
 	lib/filter.c \
 	lib/filter_cli.c \
 	lib/filter_nb.c \
+	lib/flex_algo.c \
 	lib/frrcu.c \
 	lib/frrlua.c \
 	lib/frrscript.c \
@@ -99,6 +100,7 @@ lib_libfrr_la_SOURCES = \
 	lib/sockopt.c \
 	lib/sockunion.c \
 	lib/spf_backoff.c \
+	lib/segment_routing.c \
 	lib/srcdest_table.c \
 	lib/stream.c \
 	lib/strformat.c \
@@ -210,6 +212,7 @@ pkginclude_HEADERS += \
 	lib/distribute.h \
 	lib/ferr.h \
 	lib/filter.h \
+	lib/flex_algo.h \
 	lib/freebsd-queue.h \
 	lib/frrlua.h \
 	lib/frrscript.h \
@@ -282,6 +285,7 @@ pkginclude_HEADERS += \
 	lib/sockopt.h \
 	lib/sockunion.h \
 	lib/spf_backoff.h \
+	lib/segment_routing.h \
 	lib/srcdest_table.h \
 	lib/srte.h \
 	lib/stream.h \

lib/termtable.c

@@ -7,6 +7,7 @@
 #include <zebra.h>
 #include <stdio.h>
 
+#include "lib/json.h"
 #include "printfrr.h"
 #include "memory.h"
 #include "termtable.h"
@@ -485,3 +486,45 @@ char *ttable_dump(struct ttable *tt, const char *newline)
 
 	return buf;
 }
+
+/* Crude conversion from ttable to json array.
+ * Assume that the first row has column headings.
+ *
+ * Formats are:
+ *   d	int32
+ *   f	double
+ *   l	int64
+ *   s	string (default)
+ */
+json_object *ttable_json(struct ttable *tt, const char *const formats)
+{
+	struct ttable_cell *row; /* iteration pointers */
+	json_object *json = NULL;
+
+	json = json_object_new_array();
+
+	for (int i = 1; i < tt->nrows; i++) {
+		json_object *jobj;
+		json_object *val;
+
+		row = tt->table[i];
+		jobj = json_object_new_object();
+		json_object_array_add(json, jobj);
+		for (int j = 0; j < tt->ncols; j++) {
+			switch (formats[j]) {
+			case 'd':
+			case 'l':
+				val = json_object_new_int64(atol(row[j].text));
+				break;
+			case 'f':
+				val = json_object_new_double(atof(row[j].text));
+				break;
+			default:
+				val = json_object_new_string(row[j].text);
+			}
+			json_object_object_add(jobj, tt->table[0][j].text, val);
+		}
+	}
+
+	return json;
+}

lib/termtable.h

@@ -8,6 +8,7 @@
 #define _TERMTABLE_H_
 
 #include <zebra.h>
+#include "lib/json.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -277,6 +278,17 @@ void ttable_rowseps(struct ttable *tt, unsigned int row,
  */
 char *ttable_dump(struct ttable *tt, const char *newline);
 
+/**
+ * Convert a table to a JSON array of objects.
+ *
+ * Caller must free the returned json_object structure.
+ *
+ * @param tt the table to convert
+ * @param formats an array of characters indicating what JSON type should be
+ * used.
+ */
+json_object *ttable_json(struct ttable *tt, const char *const formats);
+
 #ifdef __cplusplus
 }
 #endif

lib/typesafe.h

@@ -20,6 +20,9 @@ extern "C" {
 #define frr_each(prefix, head, item)                                           \
 	for (item = prefix##_first(head); item;                                \
 			item = prefix##_next(head, item))
+#define frr_each_const(prefix, head, item)                                     \
+	for (item = prefix##_const_first(head); item;                          \
+	     item = prefix##_const_next(head, item))
 #define frr_each_safe(prefix, head, item)                                      \
 	for (typeof(prefix##_next_safe(head, NULL)) prefix##_safe =            \
 			prefix##_next_safe(head,                               \

tests/isisd/test_common.c

@@ -98,7 +98,7 @@ static void lsp_add_ip_reach(struct isis_lsp *lsp,
 {
 	struct prefix prefix;
 	struct sr_prefix_cfg pcfg = {};
-	struct sr_prefix_cfg *pcfg_p = NULL;
+	struct sr_prefix_cfg *pcfg_p[SR_ALGORITHM_COUNT] = {NULL};
 
 	if (str2prefix(prefix_str, &prefix) != 1) {
 		zlog_debug("%s: invalid network: %s", __func__, prefix_str);
@@ -106,7 +106,7 @@ static void lsp_add_ip_reach(struct isis_lsp *lsp,
 	}
 
 	if (CHECK_FLAG(tnode->flags, F_ISIS_TEST_NODE_SR)) {
-		pcfg_p = &pcfg;
+		pcfg_p[SR_ALGORITHM_SPF] = &pcfg;
 
 		pcfg.sid = *next_sid_index;
 		*next_sid_index = *next_sid_index + 1;
@@ -163,31 +163,32 @@ static void lsp_add_reach(struct isis_lsp *lsp,
 static void lsp_add_router_capability(struct isis_lsp *lsp,
 				      const struct isis_test_node *tnode)
 {
-	struct isis_router_cap cap = {};
+	struct isis_router_cap *cap;
 
 	if (!tnode->router_id)
 		return;
 
-	if (inet_pton(AF_INET, tnode->router_id, &cap.router_id) != 1) {
+	cap = isis_tlvs_init_router_capability(lsp->tlvs);
+
+	if (inet_pton(AF_INET, tnode->router_id, &cap->router_id) != 1) {
 		zlog_debug("%s: invalid router-id: %s", __func__,
 			   tnode->router_id);
 		return;
 	}
 
 	if (CHECK_FLAG(tnode->flags, F_ISIS_TEST_NODE_SR)) {
-		cap.srgb.flags =
+		cap->srgb.flags =
 			ISIS_SUBTLV_SRGB_FLAG_I | ISIS_SUBTLV_SRGB_FLAG_V;
-		cap.srgb.lower_bound = tnode->srgb.lower_bound
-					       ? tnode->srgb.lower_bound
-					       : SRGB_DFTL_LOWER_BOUND;
-		cap.srgb.range_size = tnode->srgb.range_size
-					      ? tnode->srgb.range_size
-					      : SRGB_DFTL_RANGE_SIZE;
-		cap.algo[0] = SR_ALGORITHM_SPF;
-		cap.algo[1] = SR_ALGORITHM_UNSET;
+		cap->srgb.lower_bound = tnode->srgb.lower_bound
+						? tnode->srgb.lower_bound
+						: SRGB_DFTL_LOWER_BOUND;
+		cap->srgb.range_size = tnode->srgb.range_size
+					       ? tnode->srgb.range_size
+					       : SRGB_DFTL_RANGE_SIZE;
+		cap->algo[0] = SR_ALGORITHM_SPF;
+		cap->algo[1] = SR_ALGORITHM_UNSET;
 	}
 
-	isis_tlvs_set_router_capability(lsp->tlvs, &cap);
 }
 
 static void lsp_add_mt_router_info(struct isis_lsp *lsp,

tests/isisd/test_isis_spf.c

@@ -49,12 +49,13 @@ static void test_run_spf(struct vty *vty, const struct isis_topology *topology,
 	/* Run SPF. */
 	spf_type = reverse ? SPF_TYPE_REVERSE : SPF_TYPE_FORWARD;
 	spftree = isis_spftree_new(area, lspdb, root->sysid, level, tree,
-				   spf_type, F_SPFTREE_NO_ADJACENCIES);
+				   spf_type, F_SPFTREE_NO_ADJACENCIES,
+				   SR_ALGORITHM_SPF);
 	isis_run_spf(spftree);
 
 	/* Print the SPT and the corresponding routing table. */
 	isis_print_spftree(vty, spftree);
-	isis_print_routes(vty, spftree, false, false);
+	isis_print_routes(vty, spftree, NULL, false, false);
 
 	/* Cleanup SPF tree. */
 	isis_spftree_del(spftree);
@@ -71,8 +72,9 @@ static void test_run_lfa(struct vty *vty, const struct isis_topology *topology,
 
 	/* Run forward SPF in the root node. */
 	flags = F_SPFTREE_NO_ADJACENCIES;
-	spftree_self = isis_spftree_new(area, lspdb, root->sysid, level, tree,
-					SPF_TYPE_FORWARD, flags);
+	spftree_self =
+		isis_spftree_new(area, lspdb, root->sysid, level, tree,
+				 SPF_TYPE_FORWARD, flags, SR_ALGORITHM_SPF);
 	isis_run_spf(spftree_self);
 
 	/* Run forward SPF on all adjacent routers. */
@@ -84,9 +86,9 @@ static void test_run_lfa(struct vty *vty, const struct isis_topology *topology,
 	/* Print the SPT and the corresponding main/backup routing tables. */
 	isis_print_spftree(vty, spftree_self);
 	vty_out(vty, "Main:\n");
-	isis_print_routes(vty, spftree_self, false, false);
+	isis_print_routes(vty, spftree_self, NULL, false, false);
 	vty_out(vty, "Backup:\n");
-	isis_print_routes(vty, spftree_self, false, true);
+	isis_print_routes(vty, spftree_self, NULL, false, true);
 
 	/* Cleanup everything. */
 	isis_spftree_del(spftree_self);
@@ -107,8 +109,9 @@ static void test_run_rlfa(struct vty *vty, const struct isis_topology *topology,
 
 	/* Run forward SPF in the root node. */
 	flags = F_SPFTREE_NO_ADJACENCIES;
-	spftree_self = isis_spftree_new(area, lspdb, root->sysid, level, tree,
-					SPF_TYPE_FORWARD, flags);
+	spftree_self =
+		isis_spftree_new(area, lspdb, root->sysid, level, tree,
+				 SPF_TYPE_FORWARD, flags, SR_ALGORITHM_SPF);
 	isis_run_spf(spftree_self);
 
 	/* Run reverse SPF in the root node. */
@@ -162,9 +165,9 @@ static void test_run_rlfa(struct vty *vty, const struct isis_topology *topology,
 	/* Print the SPT and the corresponding main/backup routing tables. */
 	isis_print_spftree(vty, spftree_self);
 	vty_out(vty, "Main:\n");
-	isis_print_routes(vty, spftree_self, false, false);
+	isis_print_routes(vty, spftree_self, NULL, false, false);
 	vty_out(vty, "Backup:\n");
-	isis_print_routes(vty, spftree_self, false, true);
+	isis_print_routes(vty, spftree_self, NULL, false, true);
 
 	/* Cleanup everything. */
 	isis_spftree_del(spftree_self);
@@ -187,8 +190,9 @@ static void test_run_ti_lfa(struct vty *vty,
 
 	/* Run forward SPF in the root node. */
 	flags = F_SPFTREE_NO_ADJACENCIES;
-	spftree_self = isis_spftree_new(area, lspdb, root->sysid, level, tree,
-					SPF_TYPE_FORWARD, flags);
+	spftree_self =
+		isis_spftree_new(area, lspdb, root->sysid, level, tree,
+				 SPF_TYPE_FORWARD, flags, SR_ALGORITHM_SPF);
 	isis_run_spf(spftree_self);
 
 	/* Run reverse SPF in the root node. */
@@ -224,7 +228,7 @@ static void test_run_ti_lfa(struct vty *vty,
 	 * Print the post-convergence SPT and the corresponding routing table.
 	 */
 	isis_print_spftree(vty, spftree_pc);
-	isis_print_routes(vty, spftree_self, false, true);
+	isis_print_routes(vty, spftree_self, NULL, false, true);
 
 	/* Cleanup everything. */
 	isis_spftree_del(spftree_self);

tests/topotests/isis_sr_flex_algo_topo1/rt1/isisd.conf

@@ -0,0 +1,96 @@
+password 1
+hostname rt1
+log file isisd.log
+!
+!debug northbound
+!debug isis events
+!debug isis spf-events
+!debug isis route-events
+!debug isis sr-events
+!debug isis lsp-gen
+!
+affinity-map red bit-position 0
+affinity-map blue bit-position 1
+affinity-map green bit-position 2
+affinity-map yellow bit-position 3
+affinity-map orange bit-position 4
+!
+interface lo
+ ip router isis 1
+ ipv6 router isis 1
+ isis passive
+!
+interface eth-rt2
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+interface eth-rt3
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+router isis 1
+ lsp-gen-interval 2
+ net 49.0000.0000.0000.0001.00
+ is-type level-1
+ topology ipv6-unicast
+ mpls-te on
+ !
+ flex-algo 201
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any red
+ !
+ flex-algo 202
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any blue
+ !
+ flex-algo 203
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any green
+ !
+ flex-algo 204
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any blue green
+ !
+ flex-algo 205
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any red green
+ !
+ flex-algo 206
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any red blue
+ !
+ flex-algo 207
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-all yellow orange
+ !
+ segment-routing on
+ segment-routing global-block 20000 23999
+ segment-routing node-msd 8
+ segment-routing prefix 1.1.1.1/32 index 1
+ segment-routing prefix 1.1.1.1/32 algorithm 201 index 101
+ segment-routing prefix 1.1.1.1/32 algorithm 202 index 201
+ segment-routing prefix 1.1.1.1/32 algorithm 203 index 301
+ segment-routing prefix 1.1.1.1/32 algorithm 204 index 401
+ segment-routing prefix 1.1.1.1/32 algorithm 205 index 501
+ segment-routing prefix 1.1.1.1/32 algorithm 206 index 601
+ segment-routing prefix 1.1.1.1/32 algorithm 207 index 701
+ segment-routing prefix 2001:db8:1000::1/128 index 1001
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 201 index 1101
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 202 index 1201
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 203 index 1301
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 204 index 1401
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 205 index 1501
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 206 index 1601
+ segment-routing prefix 2001:db8:1000::1/128 algorithm 207 index 1701
+!

tests/topotests/isis_sr_flex_algo_topo1/rt1/step1/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt1/step1/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
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+  "20603":{
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+    "nexthops":[
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+      }
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+  },
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+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
+          21702
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+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
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+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step10/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step10/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
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+    "nexthops":[
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+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
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+    ]
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+        ],
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+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
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+        ],
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+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
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+        ],
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+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
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+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
+          21303
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step11/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step11/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
+          21303
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step2/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step2/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step3/show_isis_flex_algo.ref

@@ -0,0 +1,115 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: Not found
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step3/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
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+        "nexthop":"10.12.0.2"
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+    ]
+  },
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+        "installed":true,
+        "nexthop":"10.13.0.3"
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+    ]
+  },
+  "20602":{
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+    "nexthops":[
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
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+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
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+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
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+    "installed":true,
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+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
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+        "installed":true,
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+        "interface":"eth-rt3"
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
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+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step4/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step4/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
+          21303
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step5/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step5/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
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+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
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+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
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+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step6/show_isis_flex_algo.ref

@@ -0,0 +1,112 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: None
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step6/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
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+    "installed":true,
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+        "installed":true,
+        "nexthop":"10.12.0.2"
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+    ]
+  },
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+        "nexthop":"10.13.0.3"
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+    ]
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+  "20602":{
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
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+    "nexthops":[
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
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+  },
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+        "installed":true,
+        "nexthop":"10.13.0.3"
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+  },
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+        "outLabelStack":[
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+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
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+        "distance":150,
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+        "interface":"eth-rt2"
+      }
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+        "interface":"eth-rt2"
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+        "interface":"eth-rt3"
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+        "interface":"eth-rt3"
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+        "distance":150,
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+        "interface":"eth-rt2"
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+        "interface":"eth-rt2"
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+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step7/show_isis_flex_algo.ref

@@ -0,0 +1,108 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step7/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step8/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step8/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
+          21303
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/step9/show_isis_flex_algo.ref

@@ -0,0 +1,126 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set
+

tests/topotests/isis_sr_flex_algo_topo1/rt1/step9/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20102,
+        "outLabelStack":[
+          20102
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20303,
+        "outLabelStack":[
+          20303
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20402,
+        "outLabelStack":[
+          20402
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20603,
+        "outLabelStack":[
+          20603
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.2"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20702,
+        "outLabelStack":[
+          20702
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.3"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21102,
+        "outLabelStack":[
+          21102
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21303,
+        "outLabelStack":[
+          21303
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21402,
+        "outLabelStack":[
+          21402
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21603,
+        "outLabelStack":[
+          21603
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21702,
+        "outLabelStack":[
+          21702
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt1/zebra.conf

@@ -0,0 +1,39 @@
+log file zebra.log
+!
+hostname rt1
+!
+log stdout notifications
+log monitor notifications
+log commands
+!
+!debug zebra packet
+!debug zebra dplane
+!debug zebra kernel
+!
+affinity-map red bit-position 0
+affinity-map blue bit-position 1
+affinity-map green bit-position 2
+affinity-map yellow bit-position 3
+affinity-map orange bit-position 4
+!
+interface lo
+ ip address 1.1.1.1/32
+ ipv6 address 2001:db8:1000::1/128
+!
+interface eth-rt2
+ ip address 10.12.0.1/24
+ link-params
+  affinity red
+ exit-link-params
+!
+interface eth-rt3
+ ip address 10.13.0.1/24
+ link-params
+  affinity green yellow orange
+ exit-link-params
+!
+ip forwarding
+ipv6 forwarding
+!
+line vty
+!

tests/topotests/isis_sr_flex_algo_topo1/rt2/isisd.conf

@@ -0,0 +1,96 @@
+password 1
+hostname rt2
+log file isisd.log
+!
+!debug northbound
+!debug isis events
+!debug isis route-events
+!debug isis spf-events
+!debug isis sr-events
+!debug isis lsp-gen
+!
+affinity-map red bit-position 0
+affinity-map blue bit-position 1
+affinity-map green bit-position 2
+affinity-map yellow bit-position 3
+affinity-map orange bit-position 4
+!
+interface lo
+ ip router isis 1
+ ipv6 router isis 1
+ isis passive
+!
+interface eth-rt1
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+interface eth-rt3
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+router isis 1
+ lsp-gen-interval 2
+ net 49.0000.0000.0000.0002.00
+ is-type level-1
+ topology ipv6-unicast
+ mpls-te on
+ !
+ flex-algo 201
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any red
+ !
+ flex-algo 202
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any blue
+ !
+ flex-algo 203
+  dataplane sr-mpls
+  advertise-definition
+  affinity exclude-any green
+ !
+ flex-algo 204
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any blue green
+ !
+ flex-algo 205
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any red green
+ !
+ flex-algo 206
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-any red blue
+ !
+ flex-algo 207
+  dataplane sr-mpls
+  advertise-definition
+  affinity include-all yellow orange
+ !
+ segment-routing on
+ segment-routing global-block 20000 23999
+ segment-routing node-msd 8
+ segment-routing prefix 2.2.2.2/32 index 2
+ segment-routing prefix 2.2.2.2/32 algorithm 201 index 102
+ segment-routing prefix 2.2.2.2/32 algorithm 202 index 202
+ segment-routing prefix 2.2.2.2/32 algorithm 203 index 302
+ segment-routing prefix 2.2.2.2/32 algorithm 204 index 402
+ segment-routing prefix 2.2.2.2/32 algorithm 205 index 502
+ segment-routing prefix 2.2.2.2/32 algorithm 206 index 602
+ segment-routing prefix 2.2.2.2/32 algorithm 207 index 702
+ segment-routing prefix 2001:db8:1000::2/128 index 1002
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 201 index 1102
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 202 index 1202
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 203 index 1302
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 204 index 1402
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 205 index 1502
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 206 index 1602
+ segment-routing prefix 2001:db8:1000::2/128 algorithm 207 index 1702
+!

tests/topotests/isis_sr_flex_algo_topo1/rt2/step1/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step1/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20401,
+        "outLabelStack":[
+          20401
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20503,
+        "outLabelStack":[
+          20503
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20701,
+        "outLabelStack":[
+          20701
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21101,
+        "outLabelStack":[
+          21101
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21201":{
+    "inLabel":21201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21203,
+        "outLabelStack":[
+          21203
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step10/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step10/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step11/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step11/show_mpls_table.ref

@@ -0,0 +1,514 @@
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+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21203,
+        "outLabelStack":[
+          21203
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21311":{
+    "inLabel":21311,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step2/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step2/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
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+  "20303":{
+    "inLabel":20303,
+    "installed":true,
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+      {
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+        "installed":true,
+        "nexthop":"10.23.0.3"
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+  "20401":{
+    "inLabel":20401,
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+    "nexthops":[
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+        "nexthop":"10.23.0.3"
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+  "20403":{
+    "inLabel":20403,
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+        "nexthop":"10.12.0.1"
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+    "nexthops":[
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+        "outLabel":20503,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
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+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20701,
+        "outLabelStack":[
+          20701
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
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+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21101":{
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
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+    "installed":true,
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21203,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
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+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step3/show_isis_flex_algo.ref

@@ -0,0 +1,114 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: Not found
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step3/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20401,
+        "outLabelStack":[
+          20401
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20503,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
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+  },
+  "20601":{
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+        "installed":true,
+        "nexthop":"10.12.0.1"
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+    ]
+  },
+  "20603":{
+    "inLabel":20603,
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+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
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+  },
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
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+      }
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+  },
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+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
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+        "outLabelStack":[
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+        "distance":150,
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+        "interface":"eth-rt3"
+      }
+    ]
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+  "21201":{
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+        "interface":"eth-rt1"
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+        ],
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+        "interface":"eth-rt1"
+      }
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+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
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+          3
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step4/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step4/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
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+    "inLabel":20303,
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+        "installed":true,
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+        "nexthop":"10.23.0.3"
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+        "installed":true,
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+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step5/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step5/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
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+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20501":{
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+    "installed":true,
+    "nexthops":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
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+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20503,
+        "outLabelStack":[
+          20503
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20701,
+        "outLabelStack":[
+          20701
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
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+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21101":{
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+    "nexthops":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
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+    "installed":true,
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":21203,
+        "outLabelStack":[
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+        ],
+        "distance":150,
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+        "interface":"eth-rt1"
+      }
+    ]
+  },
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
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+    "installed":true,
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step6/show_isis_flex_algo.ref

@@ -0,0 +1,111 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: None
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step6/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
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+  },
+  "20203":{
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+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
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+        "nexthop":"10.12.0.1"
+      }
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+    "nexthops":[
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+  "21703":{
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+    "nexthops":[
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+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step7/show_isis_flex_algo.ref

@@ -0,0 +1,107 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step7/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
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+        "installed":true,
+        "nexthop":"10.12.0.1"
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+  "20003":{
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
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+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step8/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step8/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20401,
+        "outLabelStack":[
+          20401
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20503,
+        "outLabelStack":[
+          20503
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20701,
+        "outLabelStack":[
+          20701
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21101,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21201":{
+    "inLabel":21201,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21203,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
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+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/step9/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: yes
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt2/step9/show_mpls_table.ref

@@ -0,0 +1,482 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20003":{
+    "inLabel":20003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20101,
+        "outLabelStack":[
+          20101
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20103":{
+    "inLabel":20103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20203":{
+    "inLabel":20203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20203,
+        "outLabelStack":[
+          20203
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20303":{
+    "inLabel":20303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20401,
+        "outLabelStack":[
+          20401
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20403":{
+    "inLabel":20403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20503":{
+    "inLabel":20503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20503,
+        "outLabelStack":[
+          20503
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.12.0.1"
+      }
+    ]
+  },
+  "20603":{
+    "inLabel":20603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20701,
+        "outLabelStack":[
+          20701
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "20703":{
+    "inLabel":20703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.3"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21003":{
+    "inLabel":21003,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21101,
+        "outLabelStack":[
+          21101
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21103":{
+    "inLabel":21103,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21201":{
+    "inLabel":21201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21203":{
+    "inLabel":21203,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21203,
+        "outLabelStack":[
+          21203
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21303":{
+    "inLabel":21303,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21401,
+        "outLabelStack":[
+          21401
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21403":{
+    "inLabel":21403,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21503":{
+    "inLabel":21503,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21503,
+        "outLabelStack":[
+          21503
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21603":{
+    "inLabel":21603,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21701,
+        "outLabelStack":[
+          21701
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  },
+  "21703":{
+    "inLabel":21703,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt3"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt2/zebra.conf

@@ -0,0 +1,39 @@
+log file zebra.log
+!
+hostname rt2
+!
+log stdout notifications
+log monitor notifications
+log commands
+!
+!debug zebra packet
+!debug zebra dplane
+!debug zebra kernel
+!
+affinity-map red bit-position 0
+affinity-map blue bit-position 1
+affinity-map green bit-position 2
+affinity-map yellow bit-position 3
+affinity-map orange bit-position 4
+!
+interface lo
+ ip address 2.2.2.2/32
+ ipv6 address 2001:db8:1000::2/128
+!
+interface eth-rt1
+ ip address 10.12.0.2/24
+ link-params
+  affinity red
+ exit-link-params
+!
+interface eth-rt3
+ ip address 10.23.0.2/24
+ link-params
+  affinity blue yellow orange
+ exit-link-params
+!
+ip forwarding
+ipv6 forwarding
+!
+line vty
+!

tests/topotests/isis_sr_flex_algo_topo1/rt3/isisd.conf

@@ -0,0 +1,76 @@
+password 1
+hostname rt3
+log file isisd.log
+!
+!debug northbound
+!debug isis events
+!debug isis route-events
+!debug isis spf-events
+!debug isis sr-events
+!debug isis lsp-gen
+!
+affinity-map red bit-position 0
+affinity-map blue bit-position 1
+affinity-map green bit-position 2
+affinity-map yellow bit-position 3
+affinity-map orange bit-position 4
+!
+interface lo
+ ip router isis 1
+ ipv6 router isis 1
+ isis passive
+!
+interface eth-rt1
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+interface eth-rt2
+ ip router isis 1
+ ipv6 router isis 1
+ isis hello-multiplier 3
+ isis network point-to-point
+!
+router isis 1
+ lsp-gen-interval 2
+ net 49.0000.0000.0000.0003.00
+ is-type level-1
+ topology ipv6-unicast
+ mpls-te on
+ !
+ flex-algo 201
+  dataplane sr-mpls
+ flex-algo 202
+  dataplane sr-mpls
+ flex-algo 203
+  dataplane sr-mpls
+ flex-algo 204
+  dataplane sr-mpls
+ flex-algo 205
+  dataplane sr-mpls
+ flex-algo 206
+  dataplane sr-mpls
+ flex-algo 207
+  dataplane sr-mpls
+ !
+ segment-routing on
+ segment-routing global-block 20000 23999
+ segment-routing node-msd 8
+ segment-routing prefix 3.3.3.3/32 index 3
+ segment-routing prefix 3.3.3.3/32 algorithm 201 index 103
+ segment-routing prefix 3.3.3.3/32 algorithm 202 index 203
+ segment-routing prefix 3.3.3.3/32 algorithm 203 index 303
+ segment-routing prefix 3.3.3.3/32 algorithm 204 index 403
+ segment-routing prefix 3.3.3.3/32 algorithm 205 index 503
+ segment-routing prefix 3.3.3.3/32 algorithm 206 index 603
+ segment-routing prefix 3.3.3.3/32 algorithm 207 index 703
+ segment-routing prefix 2001:db8:1000::3/128 index 1003
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 201 index 1103
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 202 index 1203
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 203 index 1303
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 204 index 1403
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 205 index 1503
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 206 index 1603
+ segment-routing prefix 2001:db8:1000::3/128 algorithm 207 index 1703
+!

tests/topotests/isis_sr_flex_algo_topo1/rt3/step1/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt3/step1/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20202,
+        "outLabelStack":[
+          20202
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20301,
+        "outLabelStack":[
+          20301
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20502,
+        "outLabelStack":[
+          20502
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20601,
+        "outLabelStack":[
+          20601
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21201":{
+    "inLabel":21201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21202,
+        "outLabelStack":[
+          21202
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21301,
+        "outLabelStack":[
+          21301
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21502,
+        "outLabelStack":[
+          21502
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21601,
+        "outLabelStack":[
+          21601
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt3/step10/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt3/step10/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20202,
+        "outLabelStack":[
+          20202
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20301":{
+    "inLabel":20301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20301,
+        "outLabelStack":[
+          20301
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20302":{
+    "inLabel":20302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
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+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
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+          3
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+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20502,
+        "outLabelStack":[
+          20502
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20601,
+        "outLabelStack":[
+          20601
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21002":{
+    "inLabel":21002,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
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+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
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+        "outLabelStack":[
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+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
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+    "installed":true,
+    "nexthops":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":21202,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21502,
+        "outLabelStack":[
+          21502
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21601,
+        "outLabelStack":[
+          21601
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt3/step11/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt3/step11/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
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+        "interface":"eth-rt1"
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+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
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+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt3/step2/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt3/step2/show_mpls_table.ref

@@ -0,0 +1,514 @@
+{
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+        "installed":true,
+        "nexthop":"10.13.0.1"
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+    ]
+  },
+  "20002":{
+    "inLabel":20002,
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+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21202,
+        "outLabelStack":[
+          21202
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21301":{
+    "inLabel":21301,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21301,
+        "outLabelStack":[
+          21301
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21302":{
+    "inLabel":21302,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21502,
+        "outLabelStack":[
+          21502
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21601,
+        "outLabelStack":[
+          21601
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt3/step3/show_isis_flex_algo.ref

@@ -0,0 +1,114 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: Not found
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set

tests/topotests/isis_sr_flex_algo_topo1/rt3/step3/show_mpls_table.ref

@@ -0,0 +1,450 @@
+{
+  "20001":{
+    "inLabel":20001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20002":{
+    "inLabel":20002,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20101":{
+    "inLabel":20101,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20102":{
+    "inLabel":20102,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20201":{
+    "inLabel":20201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20202":{
+    "inLabel":20202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":20202,
+        "outLabelStack":[
+          20202
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20401":{
+    "inLabel":20401,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20402":{
+    "inLabel":20402,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20501":{
+    "inLabel":20501,
+    "installed":true,
+    "nexthops":[
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+        "installed":true,
+        "nexthop":"10.13.0.1"
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+    ]
+  },
+  "20502":{
+    "inLabel":20502,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20601":{
+    "inLabel":20601,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":20601,
+        "outLabelStack":[
+          20601
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20602":{
+    "inLabel":20602,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "20701":{
+    "inLabel":20701,
+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.13.0.1"
+      }
+    ]
+  },
+  "20702":{
+    "inLabel":20702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "nexthop":"10.23.0.2"
+      }
+    ]
+  },
+  "21001":{
+    "inLabel":21001,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21002":{
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+    "installed":true,
+    "nexthops":[
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+        "outLabel":3,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21101":{
+    "inLabel":21101,
+    "installed":true,
+    "nexthops":[
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+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21102":{
+    "inLabel":21102,
+    "installed":true,
+    "nexthops":[
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+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21201":{
+    "inLabel":21201,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21202":{
+    "inLabel":21202,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21202,
+        "outLabelStack":[
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+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21401":{
+    "inLabel":21401,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21402":{
+    "inLabel":21402,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21501":{
+    "inLabel":21501,
+    "installed":true,
+    "nexthops":[
+      {
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+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21502":{
+    "inLabel":21502,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21502,
+        "outLabelStack":[
+          21502
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21601":{
+    "inLabel":21601,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":21601,
+        "outLabelStack":[
+          21601
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21602":{
+    "inLabel":21602,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  },
+  "21701":{
+    "inLabel":21701,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt1"
+      }
+    ]
+  },
+  "21702":{
+    "inLabel":21702,
+    "installed":true,
+    "nexthops":[
+      {
+        "type":"SR (IS-IS)",
+        "outLabel":3,
+        "outLabelStack":[
+          3
+        ],
+        "distance":150,
+        "installed":true,
+        "interface":"eth-rt2"
+      }
+    ]
+  }
+}

tests/topotests/isis_sr_flex_algo_topo1/rt3/step4/show_isis_flex_algo.ref

@@ -0,0 +1,125 @@
+Area 1: Algorithm 201
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000001
+            Bit positions: 0
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 202
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000002
+            Bit positions: 1
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 203
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: 0x00000004
+            Bit positions: 2
+  Include-all admin-group: not-set
+  Include-any admin-group: not-set
+
+Area 1: Algorithm 204
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000006
+            Bit positions: 1, 2
+
+Area 1: Algorithm 205
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000005
+            Bit positions: 0, 2
+
+Area 1: Algorithm 206
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: not-set
+  Include-any admin-group: 0x00000003
+            Bit positions: 0, 1
+
+Area 1: Algorithm 207
+
+ Enabled Data-Planes: SR-MPLS
+
+ Elected and running Flexible-Algorithm Definition:
+  Source: 0000.0000.0002
+  Priority: 128
+  Equal to local: no
+  Local state: enabled
+  Calculation type: spf
+  Metric type: igp
+  Prefix-metric: disabled
+  Exclude SRLG: disabled
+  Exclude-any admin-group: not-set
+  Include-all admin-group: 0x00000018
+            Bit positions: 3, 4
+  Include-any admin-group: not-set