[cisco-voip] QoS on Catalyst 3550

[John.VanLaecke at ghd.com]

Normally i put on the port and trunks

"mls qos trust dscp"

Then do the policy map on the router as the switch is layer 2 and will not 
understand IP info.





Regards,

John Van Laecke 
Senior Voice Engineer




From:
Nick Matthews <matthnick at gmail.com>
To:
Michael Crilly <michael.crilly at comtek.co.uk>
Cc:
cisco-voip at puck.nether.net, cisco-nsp at puck.nether.net
Date:
03/02/2011 02:25 PM
Subject:
Re: [cisco-voip] QoS on Catalyst 3550
Sent by:
cisco-voip-bounces at puck.nether.net



If I remember correctly the DSCP value will be determined inbound.  I'm 
not sure if trusting DSCP outbound is the correct way to do this.  I would 
think it would be switched - trust dscp inbound, set dscp outbound.  Then 
again, not a 6500 guru.

-nick

On Wed, Feb 2, 2011 at 12:14 PM, Michael Crilly <
michael.crilly at comtek.co.uk> wrote:
Greetings,

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.

Using auto qos would be nice, but we can't count on the handset marking 
its traffic as DSCP 46 (or CoS 5) as we're using a mash-up of Cisco IP 
phones, Nortel phones, etc. Therefore, we want to match traffic on our 
VoIP IP network, which is currently configured to run on 10.200.0.0/16.

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.

I have attached my switch's configuration (with passwords censored). Could 
someone take a quick peak and let me know if they can see anything that is 
missing? It could be something obvious that my now stale eyes are missing, 
so a fresh pair might help.

Thanks in advance for all assistance/responses.

Kind regards,

-- 

Michael Crilly
ICT Systems Administrator
Comtek Network Systems

E: michael.crilly at comtek.co.uk


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