Address Resolution Protocol (ARP)
41-33
41
• You may need to enter a static entry in the cache if there is no response to an
ARP broadcast message. For example, some applications may not respond
to ARP requests or the response arrives too late, causing network operations
to time out.
Example
Related Commands
clear arp-cache
show arp
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.
Syntax
arp-timeout seconds
no arp-timeout
seconds - The time a dynamic entry remains in the ARP cache.
(Range: 300-86400; 86400 is one day)
Default Setting
1200 seconds (20 minutes)
Command Mode
Global Configuration
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 router may tie up resources by repeating ARP
requests for addresses recently flushed from the table.
•Use the show arp command (page 41-34) to display the current cache
timeout value.
Example
This example sets the ARP cache timeout for 15 minutes (i.e., 900 seconds).
Console(config)#arp 10.1.0.19 01-02-03-04-05-06
Console(config)#
Console(config)#arp timeout 900
Console(config)#
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