VRRP is configured for MIP-IP on two VMs. After cluster reboot, VRRP-standby VM becomes a master for fraction of second and triggers many GARP request for MIP-IP to controller. In controller ArpNotificationHandler , when GARP is received , still learntVpnIpToPort is not populated.Hence new adjacency gets added onto secondary VM's VpnInterface without deleting the adj on original master VM's VpnInterface. When controller reboot completes , Arp Responses are received from original master VM. But LearntVpnIpToPort has MIP-IP with secondary VM portname. Now MIP-IP is removed from secondary VM's VpnInterface Adj and FIB is also updated. Route pointing to nexthop as secondary VM is withdrawn from DC-GW. Finally traffic starts dropping.