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Address Resolution Protocol Commands

CLI Command Reference

September 2014 Page 503

HP Moonshot Switch Module CLI Command Reference

arp dynamicrenew

This command enables the ARP component to automatically renew dynamic ARP entries when they age out.

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 may be 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

applies only 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.

no arp dynamicrenew

This command prevents dynamic ARP entries from renewing when they age out.

arp purge

This command causes the specified IP address to be removed from the ARP cache. Only entries of type dynamic

or gateway are affected by this command.

Default disabled

Format

arp dynamicrenew

Mode Privileged EXEC

Format

no arp dynamicrenew

Mode Privileged EXEC

Format

arp purge ipaddr

Mode Privileged EXEC

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