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Configuring Restricted and Unrestricted Proxy ARP

To configure restricted or unrestricted proxy ARP, include the proxy-arp statement:

You can include this statement at the following hierarchy levels:

  • [edit interfaces interface-name unit logical-unit-number ]

  • [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]

To return to the default—that is, to disable restricted or unrestricted proxy ARP—delete the proxy-arp statement from the configuration:

You can track the number of restricted or unrestricted proxy ARP requests processed by the router or switch by issuing the show system statistics arp operational mode command.


When proxy ARP is enabled as default or unrestricted, the router or switch responds to any ARP request as long as the device has an active route to the target address of the ARP request. This gratuitous ARP behavior can result in an error when the receiving interface and target response interface are the same and the end device (for example, a client) performs a duplicate address check. To prevent this error, configure the router or switch interface with the no-gratuitous-arp-request statement. See Configuring Gratuitous ARP for information about how to disable responses to gratuitous ARP requests.