ECS3510-26P_Management Guide R02

C HAPTER 40 | IP Interface Commands
IPv4 Interface
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COMMAND USAGE
◆ When a ARP entry expires, it is deleted from the cache and an ARP
request packet is sent to re-establish the MAC address.
◆ The aging time determines how long dynamic entries remain in the
cache. If the timeout is too short, the switch may tie up resources by
repeating ARP requests for addresses recently flushed from the table.
EXAMPLE
This example sets the ARP cache timeout for 15 minutes (i.e., 900
seconds).
Console(config)#arp timeout 900
Console(config)#
clear arp-cache This command deletes all dynamic entries from the Address Resolution
Protocol (ARP) cache.
COMMAND MODE
Privileged Exec
EXAMPLE
This example clears all dynamic entries in the ARP cache.
Console#clear arp-cache
This operation will delete all the dynamic entries in ARP Cache.
Are you sure to continue this operation (y/n)?y
Console#
show arp This command displays entries in the Address Resolution Protocol (ARP)
cache.
COMMAND MODE
Normal Exec, Privileged Exec
COMMAND USAGE
This command displays information about the ARP cache. The first line
shows the cache timeout. It also shows each cache entry, including the IP
address, MAC address, type (dynamic, other), and VLAN interface. Note
that entry type “other” indicates local addresses for this router.