HP ProCurve 6108, Management And Configuration Manual

Page: 417 / 547

IP Routing Features
Configuring IP Parameters for Routing Switches
routers, including HP routing switches, can be configured to reply to ARP
requests from one network on behalf of devices on another network. See
“Enabling Proxy ARP” below.
N o t e
If the routing switch receives an ARP request packet that it is unable to deliver
to the final destination because of the ARP timeout and no ARP response is
received (the routing switch knows of no route to the destination address),
the routing switch sends an ICMP Host Unreachable message to the source.
Changing the ARP Aging Period
When the routing switch places an entry in the ARP cache, it also starts an
aging timer for the entry. the aging timer ensures that the ARP cache does not
retain learned entries that are no longer valid. An entry can become invalid
when the device with the MAC address of the entry is no longer on the network.
The default ARP age is twenty minutes. You can change the ARP age to a value
of 1 - 240 minutes.
To change the ARP age value to 30 minutes, you would use the following CLI
command from the global configuration level:
HPswitch(config)# ip arp-age 30
syntax
:
ip arp-age < 1-240 >
To display the configured ARP age value, use the command show config from
any CLI context level. The ARP age value is displayed unless you have not
configured a value for ARP age and the default configuration is still being used.
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