[cisco-voip] CallManager LAN QOS Question

[steve.siltman at assurant.com]

Ahh good catch.  I'm seeing different results between sniffer products. An 
older version of Ethereal is showing me the DiffServ field and the bits 
are correct and in both directions.  I'm guessing that my distributed 
sniffer either needs an option enabled or a module paid for. 

I have one more question so that I better understand.

<auto qos voip trust> adds <mls qos trust cos> to the interface.  Should I 
change this to <mls qos trust dscp> on all Call Manager interfaces, router 
interfaces and trunks? 
Would I ever configure dscp on a cisco or avaya ip phone interface? 
 
Thanks for the help.  I've been sniffing this almost all afternoon.

Steve Siltman
Assurant Corporate Technology
Work: 651-361-4752
Cell: 651-336-5563
steve.siltman at assurant.com



"Linsemier, Matthew" <MLinsemier at apcapital.com> 
12/10/2007 01:55 PM

To
<steve.siltman at assurant.com>, <cisco-voip at puck.nether.net>
cc

Subject
RE: [cisco-voip] CallManager LAN QOS Question






Are you just sniffing COS?  Are the DSCP values correct that CallManager 
is sending out?  RTP should be marked as DSCP EF and all SCCP,H.323, and 
SIP should be marked as DSCP C3.  What are your DSCP -> COS mappings on 
your switch?
 
From: cisco-voip-bounces at puck.nether.net 
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of 
steve.siltman at assurant.com
Sent: Monday, December 10, 2007 2:20 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] CallManager LAN QOS Question
 

Hi All. 

I implemented QOS on the LAN this weekend in our shop.  I configured 6 
closets running a slew of 3750's and four 6500 CAT switches (with a few 
6x48 blades).   I have one issue so far.  I'm sniffing one of the Call 
Manager interfaces on the switch and all packets coming into the 
CallManager seem to have the correct COS assigned.  All of the packets 
sourced by CallManager are COS = 0.  This makes it look like CallManager 
is changing these packets to 0.  Did I miss something on CallManager that 
I need to enable?   The clusterwide parameters (System - QOS) under 
Service Parameters is set to Normal Priority, EF, AF41 and CS3.     

Running CallManager 4.1.3sr5d 

Thanks, 

Steve Siltman
Assurant Corporate Technology
Work: 651-361-4752
Cell: 651-336-5563
steve.siltman at assurant.com 


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