From: tigranmartirosyan <tigran@xcloudnetworks.com>
Date: Mon, 3 Jul 2017 19:05:58 +0000 (+0400)
Subject: fix #752 problem: ARP is not updating if mac address changed on remote side
X-Git-Tag: frr-4.0-dev~502^2~4
X-Git-Url: https://git.puffer.fish/?a=commitdiff_plain;h=a08b8b0f17cebb5aa2e66163c5098be43d243afe;p=mirror%2Ffrr.git

fix #752 problem: ARP is not updating if mac address changed on remote side
---

diff --git a/zebra/interface.c b/zebra/interface.c
index b8426c6890..e355c88316 100644
--- a/zebra/interface.c
+++ b/zebra/interface.c
@@ -782,7 +782,20 @@ if_nbr_ipv6ll_to_ipv4ll_neigh_update (struct interface *ifp,
   inet_pton (AF_INET, buf, &ipv4_ll);
 
   ipv6_ll_address_to_mac(address, (u_char *)mac);
+  
+  /*
+   * Remove existed arp record for the interface, 
+   * because netlink protocol does not support message for update. 
+   * supported commands RTM_NEWNEIGH or RTM_DELNEIGH
+   */
+
+   kernel_neigh_update (0, ifp->ifindex, ipv4_ll.s_addr, mac, 6);
+  
+  /*
+   *  Add arp record
+   */
   kernel_neigh_update (add, ifp->ifindex, ipv4_ll.s_addr, mac, 6);
+  
   zvrf->neigh_updates++;
 }