Honour dscp markings

johnelliot6 · ‎02-15-2010

Hi,

We have a client with an ATM tail and Eth tail in VRF - They are marking voip traffic egress from ATM service(dscp ef46), but ingress to ethernet service all traffic appears to be re-written as default(0).

With eth tails(L2, no vrf), we simply apply 'mls qos trust dscp' on eth ports to honour the qos markings of client - Just a little unsure what is required when tails are L3 in VRF?

Thanks in advance.

Laurent Aubert · ‎02-15-2010

Yes it will work as well.

http://www.cisco.com/en/US/docs/routers/7600/ios/12.2SR/configuration/guide/mplsqos.html#wp1328031

HTH

Laurent.

johnelliot6 · ‎02-15-2010

Hi,

Thanks for the response, but I am unable to set mls qos trust on router Ints?

(config)#interface ATM1/0.55 point-to-point
(config-subif)#mls ?
rp rp

(config-subif)#pvc KOR_FRM_SA 12/55

(config-if-atm-vc)#ml?
% Unrecognized command

(config)#mls ?
rp rp

This is on 7200.

Laurent Aubert · ‎02-16-2010

I assumed you were using 7600 boxes. This command is not available on 7200 because the hw is different.

On 7200, the DSCP field of the received packets will be preserved by default and will be changed only if you re-mark the packet explicitly.

Thanks,

Laurent.