[c-nsp] N7k CoPP versus rate-limiters

Phil Mayers p.mayers at imperial.ac.uk
Thu Mar 22 07:25:48 EDT 2012


On 21/03/12 21:16, Tóth András wrote:
> Hi Phil,
>
> Sorry, my previous email deserves some clarification as it was a bit
> confusing after I read it again.
>
> OSPF packets sent to 224.0.0/24, will go through L3-control RL and not
> CoPP. However, OSPF packets sent unicast will go through CoPP and not
> L3-control RL.

Thanks, that's very helpful; it gives insight into the "split" between 
the two.

>
> There are only a few packets, such as DHCP and ARP which go through
> both CoPP and rate-limiter.

Presumably the "receive" rate-limiter is a special case o

>
> There are some packets which CoPP cannot catch, and those need to be
> rate-limited, and that is why there are rate-limiters.
>
> As mentioned, you can use the "show hardware internal forwarding
> rate-limiter usage" command to check what is handled by CoPP and what
> is handled by rate-limiter, and what by both.

This is an extremely useful bit of info; thanks very much for your 
excellent reply!

Cheers,
Phil


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