Proxy ARP

Support for proxy MAC addresses in an ARP request (ACX7100-32C, ACX7100-48L, ACX7332, ACX7348, ACX7509, ACX7024, and ACX7024X)—Provider edge (PE) devices in an EVPN network that support Address Resolution Protocol (ARP) proxy can use a proxy MAC address in the ARP replies to a host. When a PE device receives an ARP or Neighbor Discovery Protocol (NDP) request, it searches for the requested IP address in the MAC-IP address binding database. 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 integrated routing and bridging (IRB) interface or virtual gateway address (VGA) interface in an EVPN network with edge-routed bridging overlay. The address is derived from the manually configured MAC address in a centrally routed bridging overlay. If the PE device does not have an entry for the target IP address, the device resolves the ARP or NDP for that IP address and provides a proxy response for the following ARP or NS.

To enable this feature, configure the proxy-mac statement at the [edit routing-instances routing-instance-name protocols evpn] or [edit routing-instances routing-instance-name bridge-domains domain_name] hierarchy level.

[See ARP and NDP Request with a proxy MAC address.]