ECS4660-28F_Management Guide-R03

C HAPTER 49 | IP Interface Commands
IPv4 Interface
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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.
◆ 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 (1658)
show arp (1658)
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
COMMAND USAGE
◆ When a ARP entry expires, it is deleted from the cache and an ARP
request packet is sent to re-establish the MAC address.