[c-nsp] QoS on Catalyst 3550

Tony td_miles at yahoo.com
Wed Feb 2 19:57:55 EST 2011

Hi Michael,

--- On Thu, 3/2/11, Michael Crilly <michael.crilly at comtek.co.uk> wrote:
> I am attempting to configure QoS on a series of 3550s, a
> 3560 and our core switch, a 4500. Currently, I am testing
> QoS configurations on the 3550, but with limited success.

If you haven't found it already, this is a very good guide to configuring QoS on 3550:

There is also similar for 3560:

> The issue I am having is nothing is being matched when I
> look at the output of 'show policy-map interface fa0/3'
> (fa0/3, for example), but I can see packets being classified
> as DSCP 46 when I look at the 'mls qos interface fa0/3
> stats' command.

It's been so long that I can't remember if this is a bug or just "normal" behaviour. You won't see any information from "show policy-map", you never do on a 3550. You'll have to rely on the counters from "mls qos stats" to see whether your QoS is working as expected. 



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