Administering the ARP Cache 71
Removing an ARP
Cache Entry
To remove an entry from the ARP cache:
1 Enter the following at the top-level menu:
ip arp remove
The following prompt is displayed:
Select IP address:
2 Enter the IP address of the entry you want to remove.
The Layer 3 Module removes the address from the ARP cache
immediately. If necessary the Layer 3 Module subsequently uses ARP to
find the new MAC address corresponding to that IP address.
Flushing the ARP
Cache
You may want to delete all entries from the ARP cache if the MAC
address has changed.
To remove all entries from the ARP cache:
1 Enter the following at the top-level menu:
ip arp flush
The Layer 3 Module removes the entries from the ARP cache immediately.
Setting the Age Time The age time for dynamic ARP cache entries determines how long the
dynamic entries remain in the ARP cache. When the time expires, the
Layer 3 Module automatically flushes the entry from the cache. A value of
0 indicates no age time, and entries remain in the table indefinitely.
The default age time is 15 minutes.
To set the age time:
1 Enter the following at the top-level menu:
ip arp age
The following prompt is displayed:
Enter ARP age time in minutes 0 for no ageing (0-1440) [15]:
2 Enter the age time in minutes, or enter 0 for no ARP ageing.
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