[c-nsp] Filtering Layer 2 Multicasts on 6509

[Max Pierson]

VACL's should do the trick for you here. If you know the value of the
Ethertype frame, you should still be able to filter on it even though it's
proprietary. If you don't, time to break out the shark! I would start off by
trying to filter based on ethertype since that won't be common to any other
traffic on the wire.

Max

On Wed, Jan 19, 2011 at 1:54 PM, Devin Kinch <devinkinch at gmail.com> wrote:

> I have a network running two 6509's with VSS in the core of the network.
>  Several of the attached VLANs are used by an application that transmits
> audio with a non-IP based layer 2 multicast (016b.68xx.xxxx or something
> like that) stream.  It uses many different destination MAC addresses and the
> frames have their own vendor proprietary Ethertype.  We also need layer 3
> routing in the same VLANs to manage these devices.
>
> The issue I have is that all these layer 2 multicasts are causing the CPU
> usage on the Sup to hover at around 70-80%.  It isn't causing any noticeable
> impact to the network today, but it may impact future scalability.  I've
> tried using CoPP (which doesn't support L2 filtering)... is there an
> obvious, elegant way of filtering this traffic from hitting the RP, while
> still forwarding at layer 2?  Perhaps static MAC entries?
>
>
> Devin Kinch
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