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Adjusting the ARP Aging Timer

By default, the ARP aging timer is set at 20 minutes. In environments with many directly attached hosts, such as metro Ethernet environments, increasing the amount of time between ARP updates by configuring the ARP aging timer can improve performance. However, in some scenarios, it might be desirable to lower the ARP aging timer value to prevent the flooding of traffic and improve performance.

In JUNOS Release 9.4 and later, the range of the ARP aging timer is from 1 through 240 minutes.

To configure a system-wide ARP aging timer, include the aging-timer statement at the [edit system arp] hierarchy level:



[edit system arp]
aging-timer minutes;

You can also configure the ARP aging timer for each logical interface of family type inet. To configure the ARP aging timer at the logical interface level, specify the timer value in minutes at the [edit system arp aging-timer interface interface-name] hierarchy level:



[edit system arp aging-timer interface interface-name]

aging-timer-minutes;

Note: If the aging timer value is configured both at the system and the logical interface levels, the value configured at the logical interface level takes precedence for the specific logical interface.

The timer value you configure takes effect as ARP entries expire. Each refreshed ARP entry receives the new timer value. The new timer value does not apply to ARP entries that exist at the time you commit the configuration.

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