[c-nsp] QoS on Catalyst 3550

[Tony]

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:
http://blog.ine.com/2008/02/23/catalyst-qos-3550-explained/

There is also similar for 3560:
http://blog.ine.com/2008/03/03/bridging-the-gap-between-3550-and-3560-qos-part-i/
http://blog.ine.com/2008/03/26/bridging-the-gap-between-3550-and-3560-qos-part-ii/

> 
> 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. 


regards,
Tony.