Configuring ARP ARP Configurations
Configuration Guide
431
Step 3 arp timeout
timeout
Configure the ARP aging time of the VLAN interface or routed port .
timeout:
Specify the value of aging time, which ranges from 1 to 3000 in seconds. The default value is
600 seconds.
Step 4 end
Return to privileged EXEC mode.
Step 5 copy running-config startup-config
Save the settings in the configuration file.
This example shows how to configure the aging time of dynamic ARP entries as 1000
seconds for VLAN interface 2 :
Switch#configure
Switch(config)#interface vlan 2
Switch(config-if)#arp timeout 1000
Switch(config-if)#end
Switch#copy running-config startup-config

Clearing dynamic entries
Step 1 end
Return to privileged EXEC mode.
Step 2 clear arp-cache
Clear all the dynamic ARP entries.
Step 3 copy running-config startup-config
Save the settings in the configuration file.

Viewing ARP Entries
On privileged EXEC mode or any other configuration mode, you can use the following
command to view ARP entries:
show arp [
ip
] [
mac
]
or
show ip arp [
ip
] [
mac
]
Verify the active ARP entries.
ip:
Specify the IP address of your desired ARP entry.
mac:
Specify the MAC address of your desired ARP entry.
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