Provider standard ARP Timeout?

Saxon Jones saxon.jones at
Fri Aug 10 14:52:03 UTC 2012

I regularly used to lower the ARP timeout to 5 minutes (to match the
mac-address-table aging limit) on devices running on ATM LAN-E segments and
saw no ill effects.


On 10 August 2012 08:23, Jay Nakamura <zeusdadog at> wrote:

> Cisco default ARP timeout is 4 hours.  Do anyone change that to
> something shorter in a provider environment for customer with Ethernet
> connectivity?  What is a good value to set it to?
> Are there any impacts for lowering the timeout?  Other than higher CPU
> util for doing ARP a lot more on the router?

More information about the NANOG mailing list