Merge pull request FRRouting#18294 from Orange-OpenSource/isisd

isisd: Correct edge insertion into TED

isisd/isis_te.c

@@ -1193,32 +1193,18 @@ static int lsp_to_edge_cb(const uint8_t *id, uint32_t metric, bool old_metric,
 			"    |- Link Edge (Unknown) to destination vertex (%s)",
 			print_sys_hostname(id));
 
+	/* Then search if there is a reverse Edge to link them */
 	dst = ls_find_edge_by_destination(args->ted, edge->attributes);
 	if (dst) {
 		/* Attach remote link if not set */
-		if (edge->source && dst->destination == NULL) {
-			vertex = edge->source;
-			if (vertex->incoming_edges)
-				listnode_add_sort_nodup(vertex->incoming_edges,
-							dst);
+		if (dst->destination == NULL) {
+			listnode_add_sort_nodup(vertex->incoming_edges, dst);
 			dst->destination = vertex;
 		}
 		/* and destination vertex to this edge if not set */
-		if (dst->source && edge->destination == NULL) {
-			vertex = dst->source;
-			if (vertex->incoming_edges)
-				listnode_add_sort_nodup(vertex->incoming_edges,
-							edge);
-			edge->destination = vertex;
-		}
-	} else {
-		/* Search dst. Vertex by Extended Reach. ID if not found */
 		if (edge->destination == NULL) {
-			vertex = ls_find_vertex_by_key(args->ted,
-						       sysid_to_key(id));
-			if (vertex && vertex->incoming_edges)
-				listnode_add_sort_nodup(vertex->incoming_edges,
-							edge);
+			vertex = dst->source;
+			listnode_add_sort_nodup(vertex->incoming_edges, edge);
 			edge->destination = vertex;
 		}
 	}