Chapter 26
| IP Interface Commands
IPv4 Interface
– 653 –
ARP Configuration This section describes commands used to configure the Address Resolution
Protocol (ARP) on the switch.
arp timeout This command sets the aging time for dynamic entries in the Address Resolution
Protocol (ARP) cache. Use the no form to restore the default timeout.
Syntax
arp timeout seconds
no arp timeout
seconds - The time a dynamic entry remains in the ARP cache. (Range: 300-
86400; 86400 seconds is one day)
Default Setting
1200 seconds (20 minutes)
Command Mode
Global Configuration
Command Usage
â—† When a ARP entry expires, it is deleted from the cache and an ARP request
packet is sent to re-establish the MAC address.
â—† 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)#
Table 139: Address Resolution Protocol Commands
Command Function Mode
arp timeout Sets the time a dynamic entry remains in the ARP cache GC
clear arp-cache Deletes all dynamic entries from the ARP cache PE
show arp Displays entries in the ARP cache NE, PE
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