Reconsider routes even when their metric didn't decrease.

route.c

@@ -585,7 +585,8 @@ trigger_route_change(struct route *route,
         if(route->installed)
             send_triggered_update(route, oldsrc, oldmetric);
     } else {
-        if(route->metric < oldmetric)
+        /* Reconsider routes even when their metric didn't decrease,
+           they may not have been feasible before. */
         consider_route(route);
     }
 }