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neutron vxlan and discovery

Hello Team

One tenant, 10 compute nodes with multiple VMs on each, all of those VMs using one network_type = vxlan.

a. If i do understand correctly between each pair of nodes we need to build vxlan tunnel ? (45 tunnels in total)

b. how does the node1 knows to which node sent the packet ? (via which vxlan tunnel) ? Is it trying to ask all other nodes for mac addresses of all VMs and then sending unicast in data plane to specific vtep ? Or maybe use multicast for that ?