CLI Reference Guide-R01

Chapter 30 | IP Interface Commands
IPv4 Interface
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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 put 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.
◆ Static entries will not be aged out nor deleted when power is reset. A static
entry can only be removed through the configuration interface.
Example
Console(config)#arp 10.1.0.19 01-02-03-04-05-06
Console(config)#
Related Commands
clear arp-cache (818)
show arp (818)
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 timeout.
Syntax
arp timeout seconds
no arp timeout
seconds - The time a dynamic entry remains in the ARP cache.
(Range: 300-86400; 86400 seconds is one day)
Default Setting
1200 seconds (20 minutes)
Command Mode
Global Configuration