[cisco-voip] auto QoS for Ip telephony solution

[Linsemier, Matthew]

This is a good topic for discussion.  I posted to this list a while back
about which Cisco software packages, specifically their VoIP software
line, does and does not mark traffic before sending it on to the switch.
Because I have never received a firm answer, I always thought it to be a
best practice to mark / re-mark this traffic to be sure.  If there was a
definitive with version numbers list I may default to trusting DSCP on
the switches using Auto-QoS.  Until then, as long as re-marking the
traffic doesn't have significant overhead, I don't see the harm unless
your QoS remarking was misconfigured.

 

Any of you Cisco guys want to shed some light on this?

 

-Matt

 

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ed Leatherman
Sent: Monday, September 18, 2006 10:30 AM
To: Erik Erasmus (E)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] auto QoS for Ip telephony solution

 

Hi Erik,

I'm no qos expert by any stretch, this is just what we do and it seems
to work out for us.. traffic markings come out end-to-end how we want
them to at least. If someone else sees something wrong with it i'd love
to hear it. 

I've been using "auto qos voip trust" on both those instances, i've been
adding to that "mls qos trust dscp" to the callmanager ports and layer 3
links, because the auto trust statement seems to put mls qos trust cos
instead. To my understanding the callmanager servers mark their traffic
with the dscp bits. 

Ed

On 9/18/06, Erik Erasmus (E) <ErasmuE4 at telkom.co.za> wrote:

 

Currently at branches we use auto-QoS VoIP cisco-phone on all the 3560
series switchports connection to cisco phones and the same at HQ on the
4500 series switches. 

 

1.	I want to know what is recommended for the trunk interface on
the switch between the branch gateway and the lan switch on the 802.1Q
trunk and also on the router main / subinterfaces. 
2.	Also what is recommended on switch ports connecting to the Cisco
Call Manager at HQ. Is it auto QoS VoIP trust ???

 




-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University 
Telecommunications and Network Operations 


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