diff --git a/isisd/isis_route.c b/isisd/isis_route.c
index 636a63e290..05394e0fe4 100644
--- a/isisd/isis_route.c
+++ b/isisd/isis_route.c
@@ -49,8 +49,16 @@
 #include "isis_route.h"
 #include "isis_zebra.h"
 
+DEFINE_HOOK(isis_route_update_hook,
+	    (struct isis_area * area, struct prefix *prefix,
+	     struct isis_route_info *route_info),
+	    (area, prefix, route_info))
+
 static struct isis_nexthop *nexthoplookup(struct list *nexthops, int family,
 					  union g_addr *ip, ifindex_t ifindex);
+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)
@@ -316,7 +324,7 @@ struct isis_route_info *isis_route_create(struct prefix *prefix,
 	return route_info;
 }
 
-static void isis_route_delete(struct route_node *rode,
+static void isis_route_delete(struct isis_area *area, struct route_node *rode,
 			      struct route_table *table)
 {
 	struct isis_route_info *rinfo;
@@ -343,13 +351,37 @@ static void isis_route_delete(struct route_node *rode,
 		UNSET_FLAG(rinfo->flag, ISIS_ROUTE_FLAG_ACTIVE);
 		if (isis->debugs & DEBUG_RTE_EVENTS)
 			zlog_debug("ISIS-Rte: route delete  %s", buff);
-		isis_zebra_route_update(prefix, src_p, rinfo);
+		isis_route_update(area, prefix, src_p, rinfo);
 	}
 	isis_route_info_delete(rinfo);
 	rode->info = NULL;
 	route_unlock_node(rode);
 }
 
+static void isis_route_update(struct isis_area *area, struct prefix *prefix,
+			      struct prefix_ipv6 *src_p,
+			      struct isis_route_info *route_info)
+{
+	if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE)) {
+		if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
+			return;
+
+		isis_zebra_route_add_route(prefix, src_p, 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 {
+		if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
+			return;
+
+		isis_zebra_route_del_route(prefix, src_p, route_info);
+		hook_call(isis_route_update_hook, area, prefix, route_info);
+
+		UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
+	}
+}
+
 static void _isis_route_verify_table(struct isis_area *area,
 				     struct route_table *table,
 				     struct route_table **tables)
@@ -390,7 +422,7 @@ static void _isis_route_verify_table(struct isis_area *area,
 				buff);
 		}
 
-		isis_zebra_route_update(dst_p, src_p, rinfo);
+		isis_route_update(area, dst_p, src_p, rinfo);
 
 		if (CHECK_FLAG(rinfo->flag, ISIS_ROUTE_FLAG_ACTIVE))
 			continue;
@@ -399,7 +431,7 @@ static void _isis_route_verify_table(struct isis_area *area,
 		 * directly for
 		 * validating => no problems with deleting routes. */
 		if (!tables) {
-			isis_route_delete(rnode, table);
+			isis_route_delete(area, rnode, table);
 			continue;
 		}
 
@@ -422,7 +454,7 @@ static void _isis_route_verify_table(struct isis_area *area,
 			route_unlock_node(drnode);
 		}
 
-		isis_route_delete(rnode, table);
+		isis_route_delete(area, rnode, table);
 	}
 }
 
diff --git a/isisd/isis_route.h b/isisd/isis_route.h
index a20a7e038f..2326bb8228 100644
--- a/isisd/isis_route.h
+++ b/isisd/isis_route.h
@@ -44,6 +44,11 @@ struct isis_route_info {
 	struct list *nexthops;
 };
 
+DECLARE_HOOK(isis_route_update_hook,
+	     (struct isis_area * area, struct prefix *prefix,
+	      struct isis_route_info *route_info),
+	     (area, prefix, route_info))
+
 struct isis_route_info *isis_route_create(struct prefix *prefix,
 					  struct prefix_ipv6 *src_p,
 					  uint32_t cost,
diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c
index ee253c7a31..bdf00b64cc 100644
--- a/isisd/isis_tlvs.c
+++ b/isisd/isis_tlvs.c
@@ -186,10 +186,10 @@ static int unpack_item_prefix_sid(uint16_t mtid, uint8_t len, struct stream *s,
 	}
 
 	sid.flags = stream_getc(s);
-	if ((sid.flags & ISIS_PREFIX_SID_VALUE)
-	    != (sid.flags & ISIS_PREFIX_SID_LOCAL)) {
+	if (!!(sid.flags & ISIS_PREFIX_SID_VALUE)
+	    != !!(sid.flags & ISIS_PREFIX_SID_LOCAL)) {
 		sbuf_push(log, indent, "Flags inplausible: Local Flag needs to match Value Flag\n");
-		return 0;
+		return 1;
 	}
 
 	sid.algorithm = stream_getc(s);
diff --git a/isisd/isis_zebra.c b/isisd/isis_zebra.c
index e8481a558b..d1bc20ba5a 100644
--- a/isisd/isis_zebra.c
+++ b/isisd/isis_zebra.c
@@ -219,9 +219,9 @@ static int isis_zebra_link_params(ZAPI_CALLBACK_ARGS)
 	return 0;
 }
 
-static void isis_zebra_route_add_route(struct prefix *prefix,
-				       struct prefix_ipv6 *src_p,
-				       struct isis_route_info *route_info)
+void isis_zebra_route_add_route(struct prefix *prefix,
+				struct prefix_ipv6 *src_p,
+				struct isis_route_info *route_info)
 {
 	struct zapi_route api;
 	struct zapi_nexthop *api_nh;
@@ -229,7 +229,7 @@ static void isis_zebra_route_add_route(struct prefix *prefix,
 	struct listnode *node;
 	int count = 0;
 
-	if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
+	if (zclient->sock < 0)
 		return;
 
 	memset(&api, 0, sizeof(api));
@@ -292,17 +292,15 @@ static void isis_zebra_route_add_route(struct prefix *prefix,
 	api.nexthop_num = count;
 
 	zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
-	SET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
-	UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_RESYNC);
 }
 
-static void isis_zebra_route_del_route(struct prefix *prefix,
-				       struct prefix_ipv6 *src_p,
-				       struct isis_route_info *route_info)
+void isis_zebra_route_del_route(struct prefix *prefix,
+				struct prefix_ipv6 *src_p,
+				struct isis_route_info *route_info)
 {
 	struct zapi_route api;
 
-	if (!CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED))
+	if (zclient->sock < 0)
 		return;
 
 	memset(&api, 0, sizeof(api));
@@ -316,20 +314,6 @@ static void isis_zebra_route_del_route(struct prefix *prefix,
 	}
 
 	zclient_route_send(ZEBRA_ROUTE_DELETE, zclient, &api);
-	UNSET_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ZEBRA_SYNCED);
-}
-
-void isis_zebra_route_update(struct prefix *prefix,
-			     struct prefix_ipv6 *src_p,
-			     struct isis_route_info *route_info)
-{
-	if (zclient->sock < 0)
-		return;
-
-	if (CHECK_FLAG(route_info->flag, ISIS_ROUTE_FLAG_ACTIVE))
-		isis_zebra_route_add_route(prefix, src_p, route_info);
-	else
-		isis_zebra_route_del_route(prefix, src_p, route_info);
 }
 
 static int isis_zebra_read(ZAPI_CALLBACK_ARGS)
diff --git a/isisd/isis_zebra.h b/isisd/isis_zebra.h
index 20c10d0b23..d00f348c8e 100644
--- a/isisd/isis_zebra.h
+++ b/isisd/isis_zebra.h
@@ -29,9 +29,12 @@ void isis_zebra_stop(void);
 
 struct isis_route_info;
 
-void isis_zebra_route_update(struct prefix *prefix,
-			     struct prefix_ipv6 *src_p,
-			     struct isis_route_info *route_info);
+void isis_zebra_route_add_route(struct prefix *prefix,
+				struct prefix_ipv6 *src_p,
+				struct isis_route_info *route_info);
+void isis_zebra_route_del_route(struct prefix *prefix,
+				struct prefix_ipv6 *src_p,
+				struct isis_route_info *route_info);
 int isis_distribute_list_update(int routetype);
 void isis_zebra_redistribute_set(afi_t afi, int type);
 void isis_zebra_redistribute_unset(afi_t afi, int type);
diff --git a/isisd/isisd.h b/isisd/isisd.h
index 393b1d67c7..308f018c19 100644
--- a/isisd/isisd.h
+++ b/isisd/isisd.h
@@ -58,7 +58,6 @@ extern struct zebra_privs_t isisd_privs;
 
 /* uncomment if you are a developer in bug hunt */
 /* #define EXTREME_DEBUG  */
-/* #define EXTREME_DICT_DEBUG */
 
 struct fabricd;