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arp
This command adds a static entry in the Address Resolution Protocol (ARP)
cache. Use the no form to remove an entry from the cache.
Syntax
arp ip-address hardware-address
no arp ip-address
• ip-address - IP address to map to a specified hardware address.
• hardware-address - Hardware address to map to a specified IP address.
(The format for this address is xx-xx-xx-xx-xx-xx.)
Default Setting
No default entries
Command Mode
Global Configuration
Command Usage
• The ARP cache is used to map 32-bit IP addresses into 48-bit hardware
(i.e., Media Access Control) addresses. This cache includes entries for
hosts and other routers on local network interfaces defined on this
router.
• The maximum number of static entries allowed in the ARP cache is 128.
• 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
Console(config)#arp 10.1.0.19 01-02-03-04-05-06
Console(config)#