[cisco-voip] QoS on Catalyst Switches

[Bell, Joe]

The 2q2t and 1p2q2t structures speak to the queues on particular
interfaces and are defined by the hardware.  In an nut shell, you are
stuck with the queue structure.  But, you can re-map particular cos
values to particular queues.  I think were your going with this question
is "how do I re-assign which cos values end up in which queue".

 

First, by default on the 6500, cos 3 is in the wrong queue on interfaces
with 2q2t and 1p2q2t queue structures.  By default on 35xx, cos 5 is in
the wrong queue, so here is how we deal with it.

 

Cat 6500 - When you issue one of these mapping commands on a 6500, it
applies to all ports with that queue structure.

 

set qos map 2q2t tx 2 1 cos 3  <-- This command puts the cos value of 3
in the second queue, first threshold;  which is the priority queue for
ports with 2q2t and 1p2q2t structures.  You can check this by issuing
this command:

 

sh qos info conf 2q2t tx

 

Queue Threshold CoS

----- --------- ---------------

1     1         0 1

1     2         2

2     1         3 4 5   <-- Priority queue

2     2         6 7

 

You would do the same thing for ports with 1p2q2t.  Command looks like
this:

 

set qos map 1p2q2t tx 2 1 cos 3

 

 

35xx - has interface oriented commands rather than global:

 

On the 35xx series switches, the priority queue is queue 4.  The
following command puts cos 5 in queue 4.

 

 

Priority-queue out  <-- enable priority queuing on that port

Wrr-queue cos-map 4 5  <-- 4th queue, assign cos 5

 

You can verify this with this command:

 

Show mls qos interface queuing

 

Cos-queue map:

cos-qid

 0 - 1

 1 - 1

 2 - 2

 3 - 2

 4 - 3

 5 - 4   <-- Cos 5 is in queue 4; used to be in queue 3

 6 - 4

 7 - 4

 

 

The QoS SRND is a great resource for all of this info.

 

Joe

 

 

 

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Zevier Thoran
Sent: Thursday, March 30, 2006 8:28 AM
To: Cisco Voip
Subject: [cisco-voip] QoS on Catalyst Switches

 

Hi,
How can I setup 1p2q2t and 2q2t interfaces on each of the following?
Catalyst 6509, 33550 and 3825 Etherswitch Router?
Thanks
-Zevier.

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