[c-nsp] 7200 DSCP-to-EXP Mapping

[ar]

I believe as the packet travels the MPLS domain, same EXP bits are applied as they swap top labels..this means I can always match on the same exp bit as it was mapped at the ingress PE. Do I still need the qos-groups in this case?



--- On Mon, 9/19/11, Vitkovsky, Adam <avitkovsky at emea.att.com> wrote:

From: Vitkovsky, Adam <avitkovsky at emea.att.com>
Subject: Re: [c-nsp] 7200 DSCP-to-EXP Mapping
To: "Oliver Boehmer (oboehmer)" <oboehmer at cisco.com>, "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
Date: Monday, September 19, 2011, 8:13 PM

Speaking of pipe modes :)

I also failed to use the pipe mode with 12.2.33 SR codes
As I was not able to use the qos-groups to keep track of the EXP value on the egress PE
So on 7200s I pretty much got stuck with a short pipe mode and "set mpls-exp imposition" at the ingress PE 

adam
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Oliver Boehmer (oboehmer)
Sent: Monday, September 19, 2011 1:43 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 7200 DSCP-to-EXP Mapping

 
> >
> > > I don't think there is in alternative to "set dscp
> > > default" on ingress policy-maps to effectively remark
> > > ingress traffic on an edge-LSR device.
> >
> > Not sure what you mean - as in you don't think we can mark
> > anything other than 'default' on ingress?
> 
> 'course not, sorry.. I meant to replace "default" by "<value>" before
> sending, but forgot :-|

and before someone argues: the above is obviously not relevant when
using pipe/short-pipe mode, then you do NOT want to touch the ingress
DSCP at all...

    oli


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