Provider standard ARP Timeout?

Shahab Vahabzadeh sh.vahabzadeh at
Fri Aug 10 15:45:59 UTC 2012

I am using arp-timeout 900 (means 15min), because of having problems with
my upstream ethernet connection and everything is ok, and I have not seen
any relation between MAC Address aging time and that, aging time is default
300sec for me ;)

On Fri, Aug 10, 2012 at 6:53 PM, 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?

Shahab Vahabzadeh, Network Engineer and System Administrator

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