IP Routing Features
Configuring IP Parameters for Routing Switches
routers, including ProCurve 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.
Note 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
The ARP age is the amount of time the switch keeps a MAC address learned
through ARP in the ARP cache. The switch resets the timer to zero each time
the ARP entry is refreshed and removes the entry if the timer reaches the ARP
age.
You can increase the ARP age timeout maximum to 24 hours or more with this
command:
Syntax: [no] ip arp-age <[1...1440] | infinite>
Allows the ARP age to be set from 1 to 1440 minutes (24
hours). If the option “infinite” is configured, the internal ARP
age timeout is set to 99,999,999 seconds (approximately 3.2
years). An arp-age value of 0 (zero) is stored in the
configuration file to indicate that “infinite” has been
configured. This value also displays with the show commands
and in the menu display (Menu > Switch Configuration >
IP Config).
Default: 20 minutes.
ProCurve(config)# ip arp-age 1000
Figure 7-3. Example of Setting the ARP Age Timeout to 1000 Minutes
To view the value of Arp Age timer, enter the show ip command as shown in
Figure 7-4.
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