Question

A data center engineer is deploying a VXLAN overlay across two leaf switches to extend Layer 2 connectivity without a BGP EVPN control plane. The design uses multicast for BUM (broadcast, unknown unicast, multicast) traffic replication. When a host behind Leaf-1 first sends an ARP request for a host behind Leaf-2, how do the VTEPs learn the remote host's MAC-to-VTEP mapping in this deployment?

Accepted Answer

Each VTEP learns remote MAC addresses via data-plane flood-and-learn, mapping the source MAC to the source VTEP IP as encapsulated frames are received

Answer

The remote MAC-to-VTEP binding is advertised proactively by an MP-BGP EVPN route type 2 update before any traffic flows

Answer

A centralized LISP map-server resolves the MAC-to-VTEP mapping when the VTEP registers each locally connected endpoint

Answer

The VTEPs exchange MAC tables directly using a dedicated OMP session established over the underlay