1-11 ARP ConfigurationWhen configuring ARP, go to these sections for information you are interested in:z Introduction to ARPz Configuring ARPz Configuring Gratuitous ARPz Displaying and Debugging ARPz ARP Configuration Examplesz The ARP attack detection feature is added to this manual. For details, refer to section Introductionto ARP Attack Detection.z The ARP packet rate limit feature is added to the manual. For details, refer to section Introductionto ARP Packet Rate Limit.z The periodical sending of gratuitous ARP packets feature is added. For details, refer to sectionIntroduction to Gratuitous ARP.z The proxy ARP feature is added. For details, refer to Proxy ARP Configuration.Introduction to ARPARP FunctionAddress Resolution Protocol (ARP) is used to resolve an IP address into a data link layer address.An IP address is the address of a host at the network layer. To send a network layer packet to adestination host, the device must know the data link layer address (MAC address, for example) of thedestination host or the next hop. To this end, the IP address must be resolved into the correspondingdata link layer address.Unless otherwise stated, a data link layer address in this chapter refers to a 48-bit Ethernet MACaddress.
