The GW being configured over RAs on the workloads is featuring the link-local address of the LRP; when the VM live-migrates to another node, it'll learn a new GW route (since the link-local IP addr of the LRP in the destination node is different. 

We need to inform the workload of two things:

• learn the GW information (link-local addr of the LRP for the network on the DST node)
• forget the old GW information (link-local addr of the LRP for the network on the SRC node)

This can be achieved by sending unsolicited RAs from a RAW socket (by ovnkube-node). Making the workload "forget" the old GW can be achieved by issuing a RA with a lifetime of 0.

NOTE:

• this requires an e2e test asserting connectivity to a different network to be added to the kubevirt suite (upstream)
• this solution assumes the link-local addresses are generated from the MAC addresses of the ports - privacy extensions are not supported