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Adjusting the ARP Aging Timer

By default, the ARP aging timer is set at 20 minutes. In most network environments, this default value does not cause a problem. However, in environments with many directly attached hosts, such as metro Ethernet, the number of ARP entries to update can be high. In such environments, you might want to increase the amount of time between ARP updates by configuring the ARP aging timer.

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



[edit system arp]
aging-timer minutes;

The aging timer range is from 20 through 240 minutes. The timer value you configure takes effect as ARP entries expire. In other words, each subsequent 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.

For more information about statements you can configure at the [edit system] hierarchy level, see the JUNOS System Basics Configuration Guide.

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