Proxy MAC address in an ARP or NDP request

Provider edge (PE) devices in an EVPN network that support ARP proxy can use a proxy MAC address in the ARP replies message to a host. When a PE device receives an ARP request or NDP request, it searches its MAC-IP address binding database for the requested IP address. If the device finds the MAC-IP address entry in its database, it responds to the request with the proxy MAC address. The proxy MAC address is derived from the IRB interface in an EVPN network with edge-routed bridging overlay and from the manually configured MAC address in a centrally-routed bridging overlay. If the device does not find an entry, the PE device replaces the MAC and IP address from the CE device in the ARP request with the proxy MAC and IP address of the IRB interface.