Enabling Proxy ARP on an Interface

Enabling proxy ARP at the interface level overrides the global proxy ARP.

An ARP request from one subnet can reach another subnet when both subnets are on the same physical segment (Ethernet cable), because MAC-layer broadcasts reach all the devices on the segment.

  1. Enter global configuration mode. 
    device# configure terminal
  2. Specify the interface to be configured in interface configuration mode. 
    device(config)# interface ethernet 1/1/1
  3. Enable proxy ARP on the specified interface. 
    device(config-if-e10000-1/1/1)# ip proxy-arp enable
    By default, gratuitous ARP is disabled for local proxy ARP.

The following example enables proxy ARP on Ethernet interface 1/1/1. 

device# configure terminal
device(config)# interface ethernet 1/1/1
device(config-if-e10000-1/1/1)# ip proxy-arp enable
Parent topic: ARP Parameter Configuration