3 files changed, 28 insertions, 1 deletions
diff --git a/nest/iface.c b/nest/iface.c
index 8e459363..c5236782 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -117,7 +117,7 @@ if_what_changed(struct iface *i, struct iface *j)
 {
   unsigned c;
 
-  if (((i->flags ^ j->flags) & ~(IF_UP | IF_SHUTDOWN | IF_UPDATED | IF_ADMIN_UP | IF_TMP_DOWN | IF_JUST_CREATED))
+  if (((i->flags ^ j->flags) & ~(IF_UP | IF_SHUTDOWN | IF_UPDATED | IF_ADMIN_UP | IF_LINK_UP | IF_TMP_DOWN | IF_JUST_CREATED))
       || i->index != j->index)
     return IF_CHANGE_TOO_MUCH;
   c = 0;
@@ -213,6 +213,10 @@ if_notify_change(unsigned c, struct iface *i)
 	a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 	ifa_notify_change(IF_CHANGE_UP, a);
       }
+
+  if ((c & (IF_CHANGE_UP | IF_CHANGE_DOWN | IF_CHANGE_LINK)) == IF_CHANGE_LINK)
+    neigh_if_link(i);
+
   if (c & IF_CHANGE_DOWN)
     neigh_if_down(i);
 }
diff --git a/nest/iface.h b/nest/iface.h
index 471625f2..1936885c 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -125,6 +125,7 @@ void neigh_dump_all(void);
 void neigh_prune(void);
 void neigh_if_up(struct iface *);
 void neigh_if_down(struct iface *);
+void neigh_if_link(struct iface *);
 void neigh_init(struct pool *);
 
 /*
diff --git a/nest/neighbor.c b/nest/neighbor.c
index 7e7cc491..785b1d46 100644
--- a/nest/neighbor.c
+++ b/nest/neighbor.c
@@ -278,6 +278,28 @@ neigh_if_down(struct iface *i)
     }
 }
 
+/**
+ * neigh_if_link - notify neighbor cache about interface link change
+ * @i: the interface in question
+ *
+ * Notify the neighbor cache that an interface changed link state.
+ * All owners of neighbor entries connected to this interface are
+ * notified.
+ */
+
+void
+neigh_if_link(struct iface *i)
+{
+  node *x, *y;
+
+  WALK_LIST_DELSAFE(x, y, i->neighbors)
+    {
+      neighbor *n = SKIP_BACK(neighbor, if_n, x);
+      if (n->proto->neigh_notify && n->proto->core_state != FS_FLUSHING)
+	n->proto->neigh_notify(n);
+    }
+}
+
 static inline void
 neigh_prune_one(neighbor *n)
 {