Hotfix to problem with metric change reported by Luca.

proto/rip/rip.c

@@ -267,7 +267,10 @@ rip_rte_update_if_better(rtable *tab, net *net, struct proto *p, rte *new)
   rte *old;
 
   old = rte_find(net, p);
-  if (!old || p->rte_better(new, old))
+  if (!old || p->rte_better(new, old) ||
+      (ipa_equal(old->attrs->from, new->attrs->from) &&
+      (old->u.rip.metric != new->u.rip.metric)) )
+
     rte_update(tab, net, p, new);
 }