HP ProCurve J8766A Release Note page 81

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. 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 8.
ProCurve(config)# show ip
Internet (IP) Service
IP Routing : Disabled
Default Gateway : 15.255.120.1
Default TTL
Arp Age
Domain Suffix
DNS server
VLAN
-------------------- + ---------- --------------- --------------- ---------
DEFAULT_VLAN
Figure 8. Example of show IP Command Displaying Arp Age
You can also view the value of the Arp Age timer in the configuration file.
: 64
: 1000
:
:
| IP Config
| Manual
IP Address Subnet Mask
15.255.111.13 255.255.248.0
Enhancements
Release L.11.08 Enhancements
Proxy ARP
No
75