Dell PowerConnect 8100 CLI Reference Guide - Page 942

ARP Aging Dynamic entries in the ARP cache are aged. When an entry for a neighbor router reaches its maximum age, the system sends an ARP request to the neighbor router to renew the entry. Entries for neighbor routers should remain in the ARP cache as long as the neighbor continues to respond to ARP requests. ARP cache entries for neighbor hosts are renewed more selectively. When an ARP cache entry for a neighbor host reaches its maximum age, the system checks if the cache entry has been used recently to forward data traffic. If so, the system sends an ARP request to the entry's target IP address. If a response is received, the cache entry is retained and its age is reset to 0. By enabling the dynamic renew option, the system administrator can configure ARP to attempt to renew aged ARP entries regardless of their use for forwarding. If the system learns a new ARP entry but the hardware does not have space to add the new ARP entry, the system attempts to remove entries that have not been used for forwarding recently. This action may create space for new entries in the hardware's ARP table. Commands in this Chapter This chapter explains the following commands: arp arp cachesize arp purge arp resptime arp retries arp timeout clear arp-cache clear arp-cache management ip local-proxy-arp ip proxy-arp show arp - arp Use the arp command in Global Configuration mode to create an Address Resolution Protocol (ARP) entry. Use the no form of the command to remove the entry. 942 ARP Commands