ARP rate limitation / ARP unicast request

[parisdooz12]

Hi,

I would like to apply an ARP rate limiter on my C6500.

The average ARP traffic is low, however, every 60 seconds, there is a peak, some times close from 1Mbps.

This peak is due to unicast ARP request; I have readen in other discussions that these ARP unicast request are generated by Cisco to refresh the ARP table.

So I could police ARP traffic to 1Mbps to avoid drops during these peaks, but this limit seems really high, and I ask myself if it is finally really necessary.

What's your experience about that?

Thanks

[Richard Michael]

Hi,

Use ARP policing,

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_553261.html

Allowing 1Mbps is not advisable. however you can tweak the values according to your environment.

Thanks,

Richard.