+static adj_walk_rc_t
+adj_mtu_update_walk_cb (adj_index_t ai,
+ void *arg)
+{
+ ip_adjacency_t *adj;
+
+ adj = adj_get(ai);
+
+ vnet_rewrite_update_mtu (vnet_get_main(),
+ &adj->rewrite_header);
+
+ return (ADJ_WALK_RC_CONTINUE);
+}
+
+static void
+adj_sw_mtu_update (vnet_main_t * vnm,
+ u32 sw_if_index,
+ void *ctx)
+{
+ /*
+ * Walk all the adjacencies on the interface to update the cached MTU
+ */
+ adj_walk (sw_if_index, adj_mtu_update_walk_cb, NULL);
+}
+
+void
+adj_mtu_update (u32 hw_if_index)
+{
+ /*
+ * Walk all the SW interfaces on the HW interface to update the cached MTU
+ */
+ vnet_hw_interface_walk_sw(vnet_get_main(),
+ hw_if_index,
+ adj_sw_mtu_update,
+ NULL);
+}
+