Merge pull request #16751 from opensourcerouting/fix/solo_peer-group

bgpd: Some peer-groups related changes/fixes

bgpd/bgp_updgrp.c

@@ -2016,6 +2016,8 @@ int update_group_adjust_soloness(struct peer *peer, int set)
 	struct peer_group *group;
 	struct listnode *node, *nnode;
 
+	peer_flag_set(peer, PEER_FLAG_LONESOUL);
+
 	if (!CHECK_FLAG(peer->sflags, PEER_STATUS_GROUP)) {
 		peer_lonesoul_or_not(peer, set);
 		if (peer_established(peer->connection))

bgpd/bgp_vty.c

@@ -17084,8 +17084,13 @@ static int bgp_show_one_peer_group(struct vty *vty, struct peer_group *group,
 			vty_out(vty, "\nBGP peer-group %s\n", group->name);
 	}
 
-	if ((group->bgp->as == conf->as) ||
+	if (CHECK_FLAG(conf->as_type, AS_AUTO)) {
-	    CHECK_FLAG(conf->as_type, AS_INTERNAL)) {
+		if (json)
+			json_object_string_add(json_peer_group, "type", "auto");
+		else
+			vty_out(vty, "  Peer-group type is auto\n");
+	} else if ((group->bgp->as == conf->as) ||
+		   CHECK_FLAG(conf->as_type, AS_INTERNAL)) {
 		if (json)
 			json_object_string_add(json_peer_group, "type",
 					       "internal");
@@ -18690,11 +18695,8 @@ static void bgp_config_write_peer_global(struct vty *vty, struct bgp *bgp,
 			peer->password);
 
 	/* neighbor solo */
-	if (CHECK_FLAG(peer->flags, PEER_FLAG_LONESOUL)) {
+	if (peergroup_flag_check(peer, PEER_FLAG_LONESOUL))
-		if (!peer_group_active(peer)) {
+		vty_out(vty, " neighbor %s solo\n", addr);
-			vty_out(vty, " neighbor %s solo\n", addr);
-		}
-	}
 
 	/* BGP port */
 	if (peer->port != BGP_PORT_DEFAULT) {

bgpd/bgpd.c

@@ -4708,6 +4708,7 @@ static const struct peer_flag_action peer_flag_action_list[] = {
 	{PEER_FLAG_CAPABILITY_FQDN, 0, peer_change_none},
 	{PEER_FLAG_AS_LOOP_DETECTION, 0, peer_change_none},
 	{PEER_FLAG_EXTENDED_LINK_BANDWIDTH, 0, peer_change_none},
+	{PEER_FLAG_LONESOUL, 0, peer_change_reset_out},
 	{0, 0, 0}};
 
 static const struct peer_flag_action peer_af_flag_action_list[] = {

doc/user/bgp.rst

@@ -2191,8 +2191,7 @@ and will share updates.
 .. clicmd:: neighbor PEER solo
 
    This command is used to indicate that routes advertised by the peer
-   should not be reflected back to the peer.  This command only is only
+   should not be reflected back to the peer.
-   meaningful when there is a single peer defined in the peer-group.
 
 .. clicmd:: show [ip] bgp peer-group [json]
 

tests/topotests/bgp_peer_group_solo/r1/frr.conf

@@ -0,0 +1,21 @@
+!
+int r1-eth0
+ ip address 192.168.1.1/24
+!
+int r1-eth1
+ ip address 192.168.14.1/24
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ no bgp network import-check
+ neighbor pg peer-group
+ neighbor pg remote-as external
+ neighbor pg solo
+ neighbor pg timers 1 3
+ neighbor pg timers connect 1
+ neighbor 192.168.1.2 peer-group pg
+ neighbor 192.168.1.3 peer-group pg
+ address-family ipv4 unicast
+  network 10.0.0.1/32
+ exit-address-family
+!

tests/topotests/bgp_peer_group_solo/r2/frr.conf

@@ -0,0 +1,10 @@
+!
+int r2-eth0
+ ip address 192.168.1.2/24
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+!

tests/topotests/bgp_peer_group_solo/r3/frr.conf

@@ -0,0 +1,10 @@
+!
+int r3-eth0
+ ip address 192.168.1.3/24
+!
+router bgp 65003
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 1 3
+ neighbor 192.168.1.1 timers connect 1
+!

tests/topotests/bgp_peer_group_solo/test_bgp_peer_group_solo.py

@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+# SPDX-License-Identifier: ISC
+
+# Copyright (c) 2024 by
+# Donatas Abraitis <donatas@opensourcerouting.org>
+#
+
+import os
+import re
+import sys
+import json
+import pytest
+import functools
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def setup_module(mod):
+    topodef = {"s1": ("r1", "r2", "r3")}
+    tgen = Topogen(topodef, mod.__name__)
+    tgen.start_topology()
+
+    router_list = tgen.routers()
+
+    for _, (rname, router) in enumerate(router_list.items(), 1):
+        router.load_frr_config(os.path.join(CWD, "{}/frr.conf".format(rname)))
+
+    tgen.start_router()
+
+
+def teardown_module(mod):
+    tgen = get_topogen()
+    tgen.stop_topology()
+
+
+def test_bgp_remote_as_auto():
+    tgen = get_topogen()
+
+    if tgen.routers_have_failure():
+        pytest.skip(tgen.errors)
+
+    r1 = tgen.gears["r1"]
+
+    def _bgp_converge():
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast summary json"))
+        expected = {
+            "peers": {
+                "192.168.1.2": {
+                    "remoteAs": 65002,
+                    "state": "Established",
+                    "peerState": "OK",
+                },
+                "192.168.1.3": {
+                    "remoteAs": 65003,
+                    "state": "Established",
+                    "peerState": "OK",
+                },
+            },
+            "totalPeers": 2,
+        }
+
+        return topotest.json_cmp(output, expected)
+
+    test_func = functools.partial(
+        _bgp_converge,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't converge initial state"
+
+    def _bgp_update_groups():
+        actual = []
+        output = json.loads(r1.vtysh_cmd("show bgp ipv4 unicast update-groups json"))
+        expected = [
+            {"subGroup": [{"adjListCount": 1, "peers": ["192.168.1.2"]}]},
+            {"subGroup": [{"adjListCount": 1, "peers": ["192.168.1.3"]}]},
+        ]
+
+        # update-group's number can be random and it's not deterministic,
+        # so we need to normalize the data a bit before checking.
+        # We care here about the `peers` array only actually.
+        for updgrp in output["default"].keys():
+            actual.append(output["default"][updgrp])
+
+        return topotest.json_cmp(actual, expected)
+
+    test_func = functools.partial(
+        _bgp_update_groups,
+    )
+    _, result = topotest.run_and_expect(test_func, None, count=30, wait=1)
+    assert result is None, "Can't see separate update-groups"
+
+
+if __name__ == "__main__":
+    args = ["-s"] + sys.argv[1:]
+    sys.exit(pytest.main(args))