ARP age timer
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. For more information on ARP, see “IP tables and caches”
(page 36).
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
Example 17 Setting the ARP age timeout to 1000 minutes
HP Switch(config)# ip arp-age 1000
To view the value of ARP age timer, enter the show ip command. The Arp Age time value is
shown in bold in Example 18.
Example 18 The show ip command displaying ARP age
HP Switch(config)# show ip
Internet (IP) Service
IP Routing : Disabled
Default Gateway : 15.255.120.1
Default TTL : 64
Arp Age : 1000
Domain Suffix :
DNS server :
VLAN | IP Config IP Address Subnet Mask Proxy ARP
-------------------- + ---------- --------------- --------------- ---------
DEFAULT_VLAN | Manual 15.255.111.13 255.255.248.0 No
You can also view the value of the ARP age timer in the configuration file. The ip arp-age 1000
value is shown in bold in Example 19.
40 IP Routing Features
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