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For vcenter only mode, the agent replies arp with the physical intf mac address for the VN's gateway ip. When vm migrates to a different esxi host as part of vmotion,vcenter plugin binds it to the new contrail-compute-vm,whose physical intf mac is different. But the vm still hold the old mac address for the gateway ip in the arp table. Until the old mac address gets flushed and the new mac is learnt for the gateway ip, the traffic is lost from the vm for a different subnet. Solution: Whenever VM migrates to new esxi host. and upon creation of VM interface Arp module will listen on route update. after getting the route update send the gratious arp for the Gateway IP. closes-bug:#1650219 Change-Id: I6bf4bab98c956bead866d22b7c8e8960419315b4 (cherry picked from commit 5912a8b)
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