To enable proxy ARP on an interface, use the ip proxy-arp interface configuration command.
The following example enables proxy ARP on Ethernet interface 2/0/0.
Switch(config)# interface ethernet 2/0/0
Switch(config-if)# ip proxy-arp
Use the ip rarp-server interface configuration command to allow the switch to act as a Reverse Address Resolution Protocol (RARP) server. Use the no form of this command to restore the interface to the default of no RARP server support.
ip rarp-server ip-address
no ip rarp-server ip-address