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.
