Re: Catalyst QoS - Cos.

From: William Chen (kwchen@netvigator.com)
Date: Fri Apr 02 2004 - 15:06:43 GMT-3

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Hi Bob,

Thanks a lot. So I think that the Internal DSCP and COS are really marked to
the packets in
Catalyst 3550.

> Regarding your second question: I have not labbed up a proof, but I would
> bet a cup of coffee that the dscp-cos map would be controlling. I don't
> think there is a way for the switch to "remember" the original CoS.

It is interesting. You configure the ingress port to trust the COS (with
pass-thru DSCP),
but when the packets forward to the egress port, the COS will be changed
and marked
according to DSCP-COS map.

Best Regards,
William Chen

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