From: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
Date: Sat, 9 May 2020 02:36:47 +0000 (-0700)
Subject: bgpd: Handle ES VTEP add/del to a host route
X-Git-Tag: base_7.6~208^2~6
X-Git-Url: https://git.puffer.fish/?a=commitdiff_plain;h=26c03e43fba0c1fe673f3fe574e0de560f466eac;p=mirror%2Ffrr.git

bgpd: Handle ES VTEP add/del to a host route

1. MAC-IP routes in the VPN routing table are linked to the
destination ES for efficient handling for remote ES link flaps.
2. Only MAC-IP paths whose nexthops are active (added via EAD-ES)
are imported into the VRF routing table.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
---

diff --git a/bgpd/bgp_evpn.c b/bgpd/bgp_evpn.c
index 83c5dc534e..2f1217945e 100644
--- a/bgpd/bgp_evpn.c
+++ b/bgpd/bgp_evpn.c
@@ -1485,10 +1485,10 @@ static void update_evpn_route_entry_sync_info(struct bgp *bgp,
  * or the global route table.
  */
 static int update_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
-				   afi_t afi, safi_t safi, struct bgp_dest *dest,
-				   struct attr *attr, int add,
-				   struct bgp_path_info **pi, uint8_t flags,
-				   uint32_t seq, bool setup_sync,
+				   afi_t afi, safi_t safi,
+				   struct bgp_dest *dest, struct attr *attr,
+				   int add, struct bgp_path_info **pi,
+				   uint8_t flags, uint32_t seq, bool vpn_rt,
 				   bool *old_is_sync)
 {
 	struct bgp_path_info *tmp_pi;
@@ -1520,7 +1520,7 @@ static int update_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
 	/* if a local path is being added with a non-zero esi look
 	 * for SYNC paths from ES peers and bubble up the sync-info
 	 */
-	update_evpn_route_entry_sync_info(bgp, dest, attr, seq, setup_sync);
+	update_evpn_route_entry_sync_info(bgp, dest, attr, seq, vpn_rt);
 
 	/* For non-GW MACs, update MAC mobility seq number, if needed. */
 	if (seq && !CHECK_FLAG(flags, ZEBRA_MACIP_TYPE_GW))
@@ -1612,6 +1612,14 @@ static int update_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
 		}
 	}
 
+	/* MAC-IP routes in the VNI route table are linked to the
+	 * destination ES
+	 */
+	if (route_change && vpn_rt
+	    && (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE))
+		bgp_evpn_path_es_link(tmp_pi, vpn->vni,
+				      bgp_evpn_attr_get_esi(tmp_pi->attr));
+
 	/* Return back the route entry. */
 	*pi = tmp_pi;
 	return route_change;
@@ -2513,7 +2521,7 @@ static int install_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
 
 	if (!pi) {
 		/* Create an info */
-		(void)bgp_create_evpn_bgp_path_info(parent_pi, dest,
+		pi = bgp_create_evpn_bgp_path_info(parent_pi, dest,
 						    parent_pi->attr);
 	} else {
 		if (attrhash_cmp(pi->attr, parent_pi->attr)
@@ -2539,6 +2547,11 @@ static int install_evpn_route_entry(struct bgp *bgp, struct bgpevpn *vpn,
 		pi->uptime = bgp_clock();
 	}
 
+	/* MAC-IP routes in the VNI table are linked to the destination ES */
+	if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
+		bgp_evpn_path_es_link(pi, vpn->vni,
+				      bgp_evpn_attr_get_esi(pi->attr));
+
 	/* Perform route selection and update zebra, if required. */
 	ret = evpn_route_select_install(bgp, vpn, dest);
 
@@ -2857,20 +2870,46 @@ static inline bool
 bgp_evpn_skip_vrf_import_of_local_es(const struct prefix_evpn *evp,
 				     struct bgp_path_info *pi, int install)
 {
-	if ((evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE)
-	    && bgp_evpn_attr_is_local_es(pi->attr)) {
-		if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
-			char esi_buf[ESI_STR_LEN];
-			char prefix_buf[PREFIX_STRLEN];
+	esi_t *esi;
+	struct in_addr nh;
 
-			zlog_debug(
-				"vrf %s of evpn prefix %s skipped, local es %s",
-				install ? "import" : "unimport",
-				prefix2str(evp, prefix_buf, sizeof(prefix_buf)),
-				esi_to_str(bgp_evpn_attr_get_esi(pi->attr),
-					   esi_buf, sizeof(esi_buf)));
+	if (evp->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
+		esi = bgp_evpn_attr_get_esi(pi->attr);
+
+		/* Don't import routes that point to a local destination */
+		if (bgp_evpn_attr_is_local_es(pi->attr)) {
+			if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
+				char esi_buf[ESI_STR_LEN];
+
+				zlog_debug(
+					"vrf %s of evpn prefix %pFX skipped, local es %s",
+					install ? "import" : "unimport", evp,
+					esi_to_str(esi, esi_buf,
+						   sizeof(esi_buf)));
+			}
+			return true;
+		}
+
+		/* Don't import routes with ES as destination if the nexthop
+		 * has not been advertised via the EAD-ES
+		 */
+		if (pi->attr)
+			nh = pi->attr->nexthop;
+		else
+			nh.s_addr = 0;
+		if (!bgp_evpn_es_is_vtep_active(esi, nh)) {
+			if (BGP_DEBUG(evpn_mh, EVPN_MH_RT)) {
+				char esi_buf[ESI_STR_LEN];
+
+				zlog_debug(
+					"vrf %s of evpn prefix %pFX skipped, nh %pI4 inactive in es %s",
+					install ? "import" : "unimport", evp,
+					&nh,
+					esi_to_str(esi, esi_buf,
+						   sizeof(esi_buf)));
+			}
+			return true;
 		}
-		return true;
 	}
 	return false;
 }
@@ -3210,9 +3249,11 @@ static int install_uninstall_route_in_vnis(struct bgp *bgp, afi_t afi,
 /*
  * Install or uninstall route for appropriate VNIs/ESIs.
  */
-static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
-					const struct prefix *p,
-					struct bgp_path_info *pi, int import)
+static int bgp_evpn_install_uninstall_table(struct bgp *bgp, afi_t afi,
+					    safi_t safi, const struct prefix *p,
+					    struct bgp_path_info *pi,
+					    int import, bool in_vni_rt,
+					    bool in_vrf_rt)
 {
 	struct prefix_evpn *evp = (struct prefix_evpn *)p;
 	struct attr *attr = pi->attr;
@@ -3274,13 +3315,13 @@ static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
 		    evp->prefix.route_type == BGP_EVPN_AD_ROUTE ||
 		    evp->prefix.route_type == BGP_EVPN_IP_PREFIX_ROUTE) {
 
-			irt = lookup_import_rt(bgp, eval);
+			irt = in_vni_rt ? lookup_import_rt(bgp, eval) : NULL;
 			if (irt)
 				install_uninstall_route_in_vnis(
 					bgp, afi, safi, evp, pi, irt->vnis,
 					import);
 
-			vrf_irt = lookup_vrf_import_rt(eval);
+			vrf_irt = in_vrf_rt ? lookup_vrf_import_rt(eval) : NULL;
 			if (vrf_irt)
 				install_uninstall_route_in_vrfs(
 					bgp, afi, safi, evp, pi, vrf_irt->vrfs,
@@ -3299,8 +3340,11 @@ static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
 			    || type == ECOMMUNITY_ENCODE_IP) {
 				memcpy(&eval_tmp, eval, ecom->unit_size);
 				mask_ecom_global_admin(&eval_tmp, eval);
-				irt = lookup_import_rt(bgp, &eval_tmp);
-				vrf_irt = lookup_vrf_import_rt(&eval_tmp);
+				if (in_vni_rt)
+					irt = lookup_import_rt(bgp, &eval_tmp);
+				if (in_vrf_rt)
+					vrf_irt =
+						lookup_vrf_import_rt(&eval_tmp);
 			}
 
 			if (irt)
@@ -3329,6 +3373,31 @@ static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
 	return 0;
 }
 
+/*
+ * Install or uninstall route for appropriate VNIs/ESIs.
+ */
+static int install_uninstall_evpn_route(struct bgp *bgp, afi_t afi, safi_t safi,
+					const struct prefix *p,
+					struct bgp_path_info *pi, int import)
+{
+	return bgp_evpn_install_uninstall_table(bgp, afi, safi, p, pi, import,
+						true, true);
+}
+
+/* Import the pi into vrf routing tables */
+void bgp_evpn_import_route_in_vrfs(struct bgp_path_info *pi, int import)
+{
+	struct bgp *bgp_evpn;
+
+	bgp_evpn = bgp_get_evpn();
+	if (!bgp_evpn)
+		return;
+
+	bgp_evpn_install_uninstall_table(bgp_evpn, AFI_L2VPN, SAFI_EVPN,
+					 &pi->net->p, pi, import, false /*vpn*/,
+					 true /*vrf*/);
+}
+
 /*
  * delete and withdraw all ipv4 and ipv6 routes in the vrf table as type-5
  * routes
diff --git a/bgpd/bgp_evpn_mh.c b/bgpd/bgp_evpn_mh.c
index 39523ea206..029c2e838e 100644
--- a/bgpd/bgp_evpn_mh.c
+++ b/bgpd/bgp_evpn_mh.c
@@ -66,6 +66,10 @@ static void bgp_evpn_es_cons_checks_pend_del(struct bgp_evpn_es *es);
 static void bgp_evpn_local_es_evi_do_del(struct bgp_evpn_es_evi *es_evi);
 static uint32_t bgp_evpn_es_get_active_vtep_cnt(struct bgp_evpn_es *es);
 static void bgp_evpn_l3nhg_update_on_vtep_chg(struct bgp_evpn_es *es);
+static struct bgp_evpn_es *bgp_evpn_es_new(struct bgp *bgp, const esi_t *esi);
+static void bgp_evpn_es_free(struct bgp_evpn_es *es, const char *caller);
+static void bgp_evpn_es_path_all_update(struct bgp_evpn_es_vtep *es_vtep,
+					bool active);
 
 esi_t zero_esi_buf, *zero_esi = &zero_esi_buf;
 
@@ -1231,8 +1235,19 @@ static void bgp_evpn_es_vtep_re_eval_active(struct bgp *bgp,
 		/* send remote ES to zebra */
 		bgp_zebra_send_remote_es_vtep(bgp, es_vtep, new_active);
 
-		/* update L3NHG associated with the ES */
-		bgp_evpn_l3nhg_update_on_vtep_chg(es_vtep->es);
+		/* If VTEP becomes active update the NHG first and then
+		 * the exploded routes. If VTEP becomes inactive update
+		 * routes first. This ordering is done to avoid deleting
+		 * the NHG while there are dependent routes against
+		 * it.
+		 */
+		if (new_active) {
+			bgp_evpn_l3nhg_update_on_vtep_chg(es_vtep->es);
+			bgp_evpn_es_path_all_update(es_vtep, true /*active*/);
+		} else {
+			bgp_evpn_es_path_all_update(es_vtep, false /*active*/);
+			bgp_evpn_l3nhg_update_on_vtep_chg(es_vtep->es);
+		}
 
 		/* queue up the es for background consistency checks */
 		bgp_evpn_es_cons_checks_pend_add(es_vtep->es);
@@ -1309,6 +1324,167 @@ static void bgp_evpn_es_vtep_del(struct bgp *bgp,
 		bgp_evpn_es_vtep_do_del(bgp, es_vtep, esr);
 }
 
+bool bgp_evpn_es_is_vtep_active(esi_t *esi, struct in_addr nh)
+{
+	struct bgp_evpn_es *es;
+	struct bgp_evpn_es_vtep *es_vtep;
+	struct listnode *node = NULL;
+	bool rc = false;
+
+	if (!memcmp(esi, zero_esi, sizeof(*esi)) || !nh.s_addr)
+		return true;
+
+	es = bgp_evpn_es_find(esi);
+	if (!es)
+		return false;
+
+	for (ALL_LIST_ELEMENTS_RO(es->es_vtep_list, node, es_vtep)) {
+		if (es_vtep->vtep_ip.s_addr == nh.s_addr) {
+			if (CHECK_FLAG(es_vtep->flags, BGP_EVPNES_VTEP_ACTIVE))
+				rc = true;
+			break;
+		}
+	}
+	return rc;
+}
+
+/********************** ES MAC-IP paths *************************************
+ * MAC-IP routes in the VNI routing table are linked to the destination
+ * ES for efficient updates on ES changes (such as VTEP add/del).
+ ****************************************************************************/
+void bgp_evpn_path_es_info_free(struct bgp_path_es_info *es_info)
+{
+	bgp_evpn_path_es_unlink(es_info);
+	XFREE(MTYPE_BGP_EVPN_PATH_ES_INFO, es_info);
+}
+
+static struct bgp_path_es_info *
+bgp_evpn_path_es_info_new(struct bgp_path_info *pi, vni_t vni)
+{
+	struct bgp_path_info_extra *e;
+
+	e = bgp_path_info_extra_get(pi);
+
+	/* If es_info doesn't exist allocate it */
+	if (!e->es_info) {
+		e->es_info = XCALLOC(MTYPE_BGP_EVPN_PATH_ES_INFO,
+				     sizeof(struct bgp_path_es_info));
+		e->es_info->pi = pi;
+		e->es_info->vni = vni;
+	}
+
+	return e->es_info;
+}
+
+void bgp_evpn_path_es_unlink(struct bgp_path_es_info *es_info)
+{
+	struct bgp_evpn_es *es = es_info->es;
+	struct bgp_path_info *pi;
+	char prefix_buf[PREFIX_STRLEN];
+
+	if (!es)
+		return;
+
+	pi = es_info->pi;
+	if (BGP_DEBUG(evpn_mh, EVPN_MH_RT))
+		zlog_debug(
+			"path %s unlinked from es %s",
+			prefix2str(&pi->net->p, prefix_buf, sizeof(prefix_buf)),
+			es->esi_str);
+
+	list_delete_node(es->macip_path_list, &es_info->es_listnode);
+	es_info->es = NULL;
+
+	/* if there are no other references against the ES it
+	 * needs to be freed
+	 */
+	bgp_evpn_es_free(es, __func__);
+
+	/* Note we don't free the path es_info on unlink; it will be freed up
+	 * along with the path.
+	 */
+}
+
+void bgp_evpn_path_es_link(struct bgp_path_info *pi, vni_t vni, esi_t *esi)
+{
+	struct bgp_path_es_info *es_info;
+	struct bgp_evpn_es *es;
+	struct bgp *bgp_evpn = bgp_get_evpn();
+	char prefix_buf[PREFIX_STRLEN];
+
+	es_info = pi->extra ? pi->extra->es_info : NULL;
+	/* if the esi is zero just unlink the path from the old es */
+	if (!esi || !memcmp(esi, zero_esi, sizeof(*esi))) {
+		if (es_info)
+			bgp_evpn_path_es_unlink(es_info);
+		return;
+	}
+
+	if (!bgp_evpn)
+		return;
+
+	/* setup es_info against the path if it doesn't aleady exist */
+	if (!es_info)
+		es_info = bgp_evpn_path_es_info_new(pi, vni);
+
+	/* find-create ES */
+	es = bgp_evpn_es_find(esi);
+	if (!es)
+		bgp_evpn_es_new(bgp_evpn, esi);
+
+	/* dup check */
+	if (es_info->es == es)
+		return;
+
+	/* unlink old ES if any */
+	bgp_evpn_path_es_unlink(es_info);
+
+	if (BGP_DEBUG(evpn_mh, EVPN_MH_RT))
+		zlog_debug(
+			"path %s linked to es %s",
+			prefix2str(&pi->net->p, prefix_buf, sizeof(prefix_buf)),
+			es->esi_str);
+
+	/* link mac-ip path to the new destination ES */
+	es_info->es = es;
+	listnode_init(&es_info->es_listnode, es_info);
+	listnode_add_sort(es->macip_path_list, &es_info->es_listnode);
+}
+
+static void bgp_evpn_es_path_all_update(struct bgp_evpn_es_vtep *es_vtep,
+					bool active)
+{
+	struct listnode *node;
+	struct bgp_path_es_info *es_info;
+	struct bgp_path_info *pi;
+	struct bgp_path_info *parent_pi;
+	struct bgp_evpn_es *es = es_vtep->es;
+	char prefix_buf[PREFIX_STRLEN];
+
+	if (BGP_DEBUG(evpn_mh, EVPN_MH_RT))
+		zlog_debug("update all paths linked to es %s", es->esi_str);
+
+	for (ALL_LIST_ELEMENTS_RO(es->macip_path_list, node, es_info)) {
+		pi = es_info->pi;
+		if (pi->sub_type != BGP_ROUTE_IMPORTED)
+			continue;
+
+		parent_pi = pi->extra ? pi->extra->parent : NULL;
+		if (!parent_pi || !parent_pi->attr)
+			continue;
+
+		if (es_vtep->vtep_ip.s_addr != parent_pi->attr->nexthop.s_addr)
+			continue;
+
+		if (BGP_DEBUG(evpn_mh, EVPN_MH_RT))
+			zlog_debug("update path %s linked to es %s",
+				   prefix2str(&parent_pi->net->p, prefix_buf,
+					      sizeof(prefix_buf)),
+				   es->esi_str);
+		bgp_evpn_import_route_in_vrfs(parent_pi, active ? 1 : 0);
+	}
+}
+
 /* compare ES-IDs for the global ES RB tree */
 static int bgp_es_rb_cmp(const struct bgp_evpn_es *es1,
 		const struct bgp_evpn_es *es2)
@@ -1361,6 +1537,10 @@ static struct bgp_evpn_es *bgp_evpn_es_new(struct bgp *bgp, const esi_t *esi)
 	es->es_vrf_list = list_new();
 	listset_app_node_mem(es->es_vrf_list);
 
+	/* Initialise the route list used for efficient event handling */
+	es->macip_path_list = list_new();
+	listset_app_node_mem(es->macip_path_list);
+
 	QOBJ_REG(es, bgp_evpn_es);
 
 	return es;
@@ -1372,7 +1552,8 @@ static struct bgp_evpn_es *bgp_evpn_es_new(struct bgp *bgp, const esi_t *esi)
  */
 static void bgp_evpn_es_free(struct bgp_evpn_es *es, const char *caller)
 {
-	if (es->flags & (BGP_EVPNES_LOCAL | BGP_EVPNES_REMOTE))
+	if ((es->flags & (BGP_EVPNES_LOCAL | BGP_EVPNES_REMOTE))
+	    || listcount(es->macip_path_list))
 		return;
 
 	if (BGP_DEBUG(evpn_mh, EVPN_MH_ES))
@@ -1382,6 +1563,7 @@ static void bgp_evpn_es_free(struct bgp_evpn_es *es, const char *caller)
 	list_delete(&es->es_evi_list);
 	list_delete(&es->es_vrf_list);
 	list_delete(&es->es_vtep_list);
+	list_delete(&es->macip_path_list);
 	bgp_table_unlock(es->route_table);
 
 	/* remove the entry from various databases */
diff --git a/bgpd/bgp_evpn_mh.h b/bgpd/bgp_evpn_mh.h
index bf957e581a..be4456828e 100644
--- a/bgpd/bgp_evpn_mh.h
+++ b/bgpd/bgp_evpn_mh.h
@@ -99,6 +99,11 @@ struct bgp_evpn_es {
 	/* List of ES-VRFs associated with this ES */
 	struct list *es_vrf_list;
 
+	/* List of MAC-IP global routes using this ES as destination -
+	 * element is bgp_path_info_extra->es_info
+	 */
+	struct list *macip_path_list;
+
 	/* Number of remote VNIs referencing this ES */
 	uint32_t remote_es_evi_cnt;
 
@@ -344,5 +349,10 @@ extern void bgp_evpn_vrf_es_init(struct bgp *bgp_vrf);
 extern void bgp_evpn_es_vrf_deref(struct bgp_evpn_es_evi *es_evi);
 extern void bgp_evpn_es_vrf_ref(struct bgp_evpn_es_evi *es_evi,
 				struct bgp *bgp_vrf);
+extern void bgp_evpn_path_es_info_free(struct bgp_path_es_info *es_info);
+extern void bgp_evpn_path_es_unlink(struct bgp_path_es_info *es_info);
+extern void bgp_evpn_path_es_link(struct bgp_path_info *pi, vni_t vni,
+				  esi_t *esi);
+extern bool bgp_evpn_es_is_vtep_active(esi_t *esi, struct in_addr nh);
 
 #endif /* _FRR_BGP_EVPN_MH_H */
diff --git a/bgpd/bgp_evpn_private.h b/bgpd/bgp_evpn_private.h
index e8e68c8387..cd4920e3d0 100644
--- a/bgpd/bgp_evpn_private.h
+++ b/bgpd/bgp_evpn_private.h
@@ -630,4 +630,13 @@ extern struct bgp_dest *
 bgp_global_evpn_node_lookup(struct bgp_table *table, afi_t afi, safi_t safi,
 			    const struct prefix_evpn *evp,
 			    struct prefix_rd *prd);
+extern struct bgp_node *bgp_global_evpn_node_get(struct bgp_table *table,
+						 afi_t afi, safi_t safi,
+						 const struct prefix_evpn *evp,
+						 struct prefix_rd *prd);
+extern struct bgp_node *
+bgp_global_evpn_node_lookup(struct bgp_table *table, afi_t afi, safi_t safi,
+			    const struct prefix_evpn *evp,
+			    struct prefix_rd *prd);
+extern void bgp_evpn_import_route_in_vrfs(struct bgp_path_info *pi, int import);
 #endif /* _BGP_EVPN_PRIVATE_H */
diff --git a/bgpd/bgp_memory.c b/bgpd/bgp_memory.c
index 1582b90a2e..f9aac35d05 100644
--- a/bgpd/bgp_memory.c
+++ b/bgpd/bgp_memory.c
@@ -118,6 +118,7 @@ DEFINE_MTYPE(BGPD, LCOMMUNITY_VAL, "Large Community value")
 DEFINE_MTYPE(BGPD, BGP_EVPN, "BGP EVPN Information")
 DEFINE_MTYPE(BGPD, BGP_EVPN_MH_INFO, "BGP EVPN MH Information")
 DEFINE_MTYPE(BGPD, BGP_EVPN_ES_VTEP, "BGP EVPN ES VTEP")
+DEFINE_MTYPE(BGPD, BGP_EVPN_PATH_ES_INFO, "BGP EVPN PATH ES Information")
 DEFINE_MTYPE(BGPD, BGP_EVPN_ES_EVI_VTEP, "BGP EVPN ES-EVI VTEP")
 DEFINE_MTYPE(BGPD, BGP_EVPN_ES, "BGP EVPN ESI Information")
 DEFINE_MTYPE(BGPD, BGP_EVPN_ES_EVI, "BGP EVPN ES-per-EVI Information")
diff --git a/bgpd/bgp_memory.h b/bgpd/bgp_memory.h
index 058fa4b295..a95d9ef931 100644
--- a/bgpd/bgp_memory.h
+++ b/bgpd/bgp_memory.h
@@ -116,6 +116,7 @@ DECLARE_MTYPE(BGP_EVPN_ES)
 DECLARE_MTYPE(BGP_EVPN_ES_EVI)
 DECLARE_MTYPE(BGP_EVPN_ES_VRF)
 DECLARE_MTYPE(BGP_EVPN_ES_VTEP)
+DECLARE_MTYPE(BGP_EVPN_PATH_ES_INFO)
 DECLARE_MTYPE(BGP_EVPN_ES_EVI_VTEP)
 
 DECLARE_MTYPE(BGP_EVPN)
diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index df30897dc6..29dbdbad89 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -244,6 +244,9 @@ void bgp_path_info_extra_free(struct bgp_path_info_extra **extra)
 	if (e->aggr_suppressors)
 		list_delete(&e->aggr_suppressors);
 
+	if (e->es_info)
+		bgp_evpn_path_es_info_free(e->es_info);
+
 	if ((*extra)->bgp_fs_iprule)
 		list_delete(&((*extra)->bgp_fs_iprule));
 	if ((*extra)->bgp_fs_pbr)
diff --git a/bgpd/bgp_route.h b/bgpd/bgp_route.h
index 0b76d7504b..17ca3f8b38 100644
--- a/bgpd/bgp_route.h
+++ b/bgpd/bgp_route.h
@@ -102,6 +102,19 @@ enum bgp_show_adj_route_type {
 #define BGP_NLRI_PARSE_ERROR_EVPN_TYPE1_SIZE -15
 #define BGP_NLRI_PARSE_ERROR -32
 
+/* MAC-IP/type-2 path_info in the global routing table is linked to the
+ * destination ES
+ */
+struct bgp_path_es_info {
+	/* back pointer to the route */
+	struct bgp_path_info *pi;
+	vni_t vni;
+	/* destination ES */
+	struct bgp_evpn_es *es;
+	/* memory used for linking the path to the destination ES */
+	struct listnode es_listnode;
+};
+
 /* Ancillary information to struct bgp_path_info,
  * used for uncommonly used data (aggregation, MPLS, etc.)
  * and lazily allocated to save memory.
@@ -188,6 +201,8 @@ struct bgp_path_info_extra {
 	struct list *bgp_fs_pbr;
 	/* presence of FS pbr iprule based entry */
 	struct list *bgp_fs_iprule;
+	/* Destination Ethernet Segment links for EVPN MH */
+	struct bgp_path_es_info *es_info;
 };
 
 struct bgp_path_info {