[cisco-voip] Easy QoS question - trust boundary

[Leetun, Rob]

Hi Ed,

Here is a test that will let you know if QoS is being passed through.

Capture the traffic of a phone call that goes through that router.

Also check to see if DSCP markings make it through with the following
command.

ip sla monitor 333
 type udpEcho dest-ipaddr 192.168.1.1 dest-port 1967 source-ipaddr
192.168.253.1  tos 184  frequency 10

ip sla monitor schedule 333 life 30 start-time now

The above command will send a few packets to 1.1 and the DSCP will be
set to EF.  

Watch the packets in Wireshark and examine the DSCP.  


Rob

Robert Leetun
Network Engineer
Boulder County Information Technology
2025 14th Street
Boulder, CO 80302
303 441-3866 (W)
303 441-3983 (F)
rleetun at bouldercounty.org


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Ed Leatherman
Sent: Thursday, January 28, 2010 12:44 PM
To: Cisco VOIP
Subject: [cisco-voip] Easy QoS question - trust boundary

I'm sure this is an elementary question for many.

We're reviewing (and correcting) our qos settings and right now i'm
looking at trust boundaries. We're doing our packet marking on the
edges (usually at the IP Phone or access port), so our internal
connections all trust. My question is when I get to our 7206VXR that
handles WAN connections, I don't have an "mls qos trust" command
available on the interfaces. Do these interfaces then implicitly trust
QoS markings on incoming packets, or do I need to setup some maps to
mark them again?
Most of the other devices on our network are catalyst switches so i'm
unfamiliar with this platform.. reading thru the srnd on qos has some
configurations with class-maps but I didnt see anywhere where it
talked about setting up or not setting up trust.

Thanks!

-- 
Ed Leatherman
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