[cisco-voip] auto QoS for Ip telephony solution

[Erik Erasmus (E)]

Ed

 

I did not really take time to investigate this in more detail. I have
a new implementation coming up and as one do - I am trying to improve
the way we deploy things, fix previous mistakes etc so hopefully will
have a bit of time in staging to look at what potentially is a good
way of doing it. Will let you know. Waiting for the kit to come in -
probably start early December.

 

 

 

Erik Erasmus 

 

________________________________

From: Ed Leatherman [mailto:ealeatherman at gmail.com] 
Sent: 10 November 2006 11:41 PM
To: Erik Erasmus (E)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] auto QoS for Ip telephony solution

 

Revisiting this thread since it seemed most related to my question.

As below, i've mainly been using "auto qos voip trust" on our
interfaces between cat 3750 switches. I've been going through the qos
documentation, particularly the SRND for enterprise qos - basically
what it seems to be is there are alot of differences between running
"auto qos" and the recommended configuration that they provide in the
srnd. 

One particular thing that just jumped out at me today was, using auto
qos voip trust on an interface doesn't appear to enable the priority
queue (according to the "sh mls qos int queueing" command). If that's
true i've got a ton of switches out there that need their configs
fixed.. All my traffic comes out marked OK, and queueing and so forth
are setup OK on our core routers but 90% of our distribution and
access layer switches are 3550 or 3750 models. 

So is auto-qos flat out not intended for anything but trusted
endpoints such as ccm servers? the further I dig into this the more it
seems like this is the case.



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

Thanks Ed

 

I think it sound like good advice - I was basically planning to try it
like you say.

If one does not have extensive resources it is a lot easier and
possibly good enough in most cases to use auto QoS.

 

thanks for your advice - will let the group know if during my
implementation I see something interseting.

 

________________________________

From: Ed Leatherman [mailto:ealeatherman at gmail.com]
Sent: Mon 2006-09-18 16:29
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 



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This e-mail and its contents are subject to the Telkom SA Limited
e-mail legal notice available at 
http://www.telkom.co.za/TelkomEMailLegalNotice.PDF
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-voip/attachments/20061112/855efd4f/attachment.html