Dell PowerConnect 8024 CLI Reference Guide - Page 553

no arp dynamicrenew Default Configuration The default state is enabled. Command Mode Global Configuration mode User Guidelines When an ARP entry reaches its maximum age, the system must decide whether to retain or delete the entry. If the entry has recently been used to forward data packets, the system will renew the entry by sending an ARP request to the neighbor. If the neighbor responds, the age of the ARP cache entry is reset to 0 without removing the entry from the hardware. Traffic to the host continues to be forwarded in hardware without interruption. If the entry is not being used to forward data packets, then the entry is deleted from the ARP cache, unless the dynamic renew option is enabled. If the dynamic renew option is enabled, the system sends an ARP request to renew the entry. When an entry is not renewed, it is removed from the hardware and subsequent data packets to the host trigger an ARP request. Traffic to the host is lost until the router receives an ARP reply from the host. Gateway entries, entries for a neighbor router, are always renewed. The dynamic renew option only applies to host entries. The disadvantage of enabling dynamic renew is that once an ARP cache entry is created, that cache entry continues to take space in the ARP cache as long as the neighbor continues to respond to ARP requests, even if no traffic is being forwarded to the neighbor. In a network where the number of potential neighbors is greater than the ARP cache capacity, enabling dynamic renew could prevent some neighbors from communicating because the ARP cache is full. Example console#configure console(config)#arp dynamicrenew console(config)#no arp dynamicrenew arp purge Use the arp purge command in Privileged EXEC mode to cause the specified IP address to be removed from the ARP cache. Only entries of type dynamic or gateway are affected by this command. Syntax arp purge ip-address ARP Commands 553