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bgpd: add an option for RT auto-derivation to use RFC 8635.

Browse Source 
RFC 8635 explains how RT auto-derivation should be done in section
5.1.2.1 [1]. In addition to encoding the VNI in the lowest bytes, a
3-bit field is used to encode a namespace. For VXLAN, we have to put 1
in this field. This is needed for proper interoperability with RT
auto-derivation in JunOS. Since this would break existing setup, an
additional option, "autort rfc8365-compatible" is used.

[1]: https://tools.ietf.org/html/rfc8365#section-5.1.2.1

Signed-off-by: Vincent Bernat <vincent@bernat.im>
This commit is contained in:
Vincent Bernat 2017-04-12 11:24:07 +02:00
parent 0c842c46c7
commit bf1061d876
5 changed files with 107 additions and 0 deletions
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50
bgpd/bgp_evpn.c
View File

@ -453,6 +453,8 @@ static void form_auto_rt(struct bgp *bgp, vni_t vni, struct list *rtl)
struct ecommunity_val eval;
struct ecommunity *ecomadd;
if (bgp->advertise_autort_rfc8365)
vni |= EVPN_AUTORT_VXLAN;
encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);
ecomadd = ecommunity_new();
@ -3224,6 +3226,41 @@ static void bgp_evpn_handle_export_rt_change_for_vrf(struct bgp *bgp_vrf)
update_routes_for_vni(bgp_def, vpn);
}
/*
* Handle autort change for a given VNI.
*/
static void update_autort_vni(struct hash_backet *backet, struct bgp *bgp)
{
struct bgpevpn *vpn = backet->data;
struct listnode *node, *nnode;
struct ecommunity *ecom;
if (!vpn) {
zlog_warn("%s: VNI hash entry for VNI not found", __PRETTY_FUNCTION__);
return;
}
if (!is_import_rt_configured(vpn)) {
if (is_vni_live(vpn))
bgp_evpn_uninstall_routes(bgp, vpn);
bgp_evpn_unmap_vni_from_its_rts(bgp, vpn);
for (ALL_LIST_ELEMENTS(vpn->import_rtl, node, nnode, ecom))
ecommunity_free(&ecom);
list_delete_all_node(vpn->import_rtl);
bgp_evpn_derive_auto_rt_import(bgp, vpn);
if (is_vni_live(vpn))
bgp_evpn_install_routes(bgp, vpn);
}
if (!is_export_rt_configured(vpn)) {
for (ALL_LIST_ELEMENTS(vpn->export_rtl, node, nnode, ecom))
ecommunity_free(&ecom);
list_delete_all_node(vpn->export_rtl);
bgp_evpn_derive_auto_rt_export(bgp, vpn);
if (is_vni_live(vpn))
bgp_evpn_handle_export_rt_change(bgp, vpn);
}
}
/*
* Public functions.
*/
@ -3335,6 +3372,8 @@ void evpn_rt_delete_auto(struct bgp *bgp, vni_t vni, struct list *rtl)
struct ecommunity *ecom, *ecom_auto;
struct ecommunity_val eval;
if (bgp->advertise_autort_rfc8365)
vni |= EVPN_AUTORT_VXLAN;
encode_route_target_as((bgp->as & 0xFFFF), vni, &eval);
ecom_auto = ecommunity_new();
@ -3494,6 +3533,17 @@ void bgp_evpn_handle_router_id_update(struct bgp *bgp, int withdraw)
}
}
/*
* Handle change to auto-RT algorithm - update and advertise local routes.
*/
void bgp_evpn_handle_autort_change(struct bgp *bgp)
{
hash_iterate(bgp->vnihash,
(void (*)(struct hash_backet *,
void*))update_autort_vni,
bgp);
}
/*
* Handle change to export RT - update and advertise local routes.
*/

1
bgpd/bgp_evpn.h
View File

@ -25,6 +25,7 @@
#include "bgpd.h"
#define EVPN_ROUTE_STRLEN 200 /* Must be >> MAC + IPv6 strings. */
#define EVPN_AUTORT_VXLAN 0x10000000
static inline int is_evpn_enabled(void)
{

1
bgpd/bgp_evpn_private.h
View File

@ -385,6 +385,7 @@ extern void bgp_evpn_unconfigure_import_rt_for_vrf(struct bgp *bgp_vrf,
struct ecommunity *ecomdel);
extern int bgp_evpn_handle_export_rt_change(struct bgp *bgp,
struct bgpevpn *vpn);
extern void bgp_evpn_handle_autort_change(struct bgp *bgp);
extern void bgp_evpn_handle_vrf_rd_change(struct bgp *bgp_vrf, int withdraw);
extern void bgp_evpn_handle_rd_change(struct bgp *bgp, struct bgpevpn *vpn,
int withdraw);

52
bgpd/bgp_evpn_vty.c
View File

@ -2502,6 +2502,24 @@ static void evpn_unset_advertise_all_vni(struct bgp *bgp)
bgp_zebra_advertise_all_vni(bgp, bgp->advertise_all_vni);
bgp_evpn_cleanup_on_disable(bgp);
}
/*
* EVPN - use RFC8365 to auto-derive RT
*/
static void evpn_set_advertise_autort_rfc8365(struct bgp *bgp)
{
bgp->advertise_autort_rfc8365 = 1;
bgp_evpn_handle_autort_change(bgp);
}
/*
* EVPN - don't use RFC8365 to auto-derive RT
*/
static void evpn_unset_advertise_autort_rfc8365(struct bgp *bgp)
{
bgp->advertise_autort_rfc8365 = 0;
bgp_evpn_handle_autort_change(bgp);
}
#endif /* HAVE_CUMULUS */
static void write_vni_config(struct vty *vty, struct bgpevpn *vpn)
@ -2655,6 +2673,35 @@ DEFUN (no_bgp_evpn_advertise_all_vni,
return CMD_SUCCESS;
}
DEFUN (bgp_evpn_advertise_autort_rfc8365,
bgp_evpn_advertise_autort_rfc8365_cmd,
"autort rfc8365-compatible",
"Auto-derivation of RT\n"
"Auto-derivation of RT using RFC8365\n")
{
struct bgp *bgp = VTY_GET_CONTEXT(bgp);
if (!bgp)
return CMD_WARNING;
evpn_set_advertise_autort_rfc8365(bgp);
return CMD_SUCCESS;
}
DEFUN (no_bgp_evpn_advertise_autort_rfc8365,
no_bgp_evpn_advertise_autort_rfc8365_cmd,
"no autort rfc8365-compatible",
NO_STR
"Auto-derivation of RT\n"
"Auto-derivation of RT using RFC8365\n")
{
struct bgp *bgp = VTY_GET_CONTEXT(bgp);
if (!bgp)
return CMD_WARNING;
evpn_unset_advertise_autort_rfc8365(bgp);
return CMD_SUCCESS;
}
DEFUN (bgp_evpn_default_originate,
bgp_evpn_default_originate_cmd,
"default-originate <ipv4 | ipv6>",
@ -4378,6 +4425,9 @@ void bgp_config_write_evpn_info(struct vty *vty, struct bgp *bgp, afi_t afi,
if (bgp->advertise_all_vni)
vty_out(vty, " advertise-all-vni\n");
if (bgp->advertise_autort_rfc8365)
vty_out(vty, " autort rfc8365-compatible\n");
if (bgp->advertise_gw_macip)
vty_out(vty, " advertise-default-gw\n");
@ -4455,6 +4505,8 @@ void bgp_ethernetvpn_init(void)
#if defined(HAVE_CUMULUS)
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_all_vni_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_all_vni_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_autort_rfc8365_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_autort_rfc8365_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_default_gw_cmd);
install_element(BGP_EVPN_NODE, &no_bgp_evpn_advertise_default_gw_cmd);
install_element(BGP_EVPN_NODE, &bgp_evpn_advertise_type5_cmd);

3
bgpd/bgpd.h
View File

@ -423,6 +423,9 @@ struct bgp {
/* EVPN enable - advertise local VNIs and their MACs etc. */
int advertise_all_vni;
/* EVPN - use RFC 8365 to auto-derive RT */
int advertise_autort_rfc8365;
/* Hash table of Import RTs to EVIs */
struct hash *import_rt_hash;