zebra: set remoteseq to 0 when remote mac is deleted by bgpd

When the remote mac is deleted by bgpd we can end up with an auto mac
entry in zebra if there are neighs referring to the mac. The remote sequence
number in the auto mac entry needs to be reset to 0 as the mac entry may
have been removed on all VTEPs (including the originating one).

Now if the MAC comes back on a remote VTEP it may be added with MM=0 which
 will NOT be accepted if the remote seq was not reset in the previous step.

Ticket: CM-22707

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>

diff --git a/zebra/zebra_vxlan.c b/zebra/zebra_vxlan.c
index b98b7381f4358e16dd87d704ac0a5efa309c388e..ab7ccc381cee2f1a55294bb325f9ea5a5d92aeff 100644 (file)
--- a/zebra/zebra_vxlan.c
+++ b/zebra/zebra_vxlan.c
@@ -4433,6 +4433,13 @@ static void process_remote_macip_del(vni_t vni,
        } else {
                if (CHECK_FLAG(mac->flags, ZEBRA_MAC_REMOTE)) {
                        zvni_process_neigh_on_remote_mac_del(zvni, mac);
+                       /*
+                        * the remote sequence number in the auto mac entry
+                        * needs to be reset to 0 as the mac entry may have
+                        * been removed on all VTEPs (including
+                        * the originating one)
+                        */
+                       mac->rem_seq = 0;
 
                        /* If all remote neighbors referencing a remote MAC
                         * go away, we need to uninstall the MAC.