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

[Oliver Boehmer (oboehmer)]

upon label imposition, all imposed labels will carry the exp-value selected via "set mpls-exp imposition" (or the precendence bits, by default), not only the topmost.

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. If the OP just remarks the topmost exp-value on the egress/labelled interface, the underlying DSCP value (or underlying inner label's exp field) could be exposed further downstream and could actually used for classification.

	oli

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Vitkovsky, Adam
> Sent: 19 September 2011 12:52
> To: ar; cisco-nsp at puck.nether.net; mtinka at globaltransit.net
> Subject: Re: [c-nsp] 7200 DSCP-to-EXP Mapping
> 
> What I'm not sure though it whether it reflects the TOS into top-most label
> or all the labels in the stack by default -equivalence of the set mpls
> imposition cmd
> 
> If it does the top-most only by default -than you'd need to carry the top-
> most label markings form inbound do outbound interface on the PHP node
> And I found out that is not possible on 7200 running the 12.2.33 SR codes
> -as you can't do: exp to qos-group - qos-group to exp
> 
> adam
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of ar
> Sent: Monday, September 19, 2011 11:35 AM
> To: cisco-nsp at puck.nether.net; mtinka at globaltransit.net
> Subject: Re: [c-nsp] 7200 DSCP-to-EXP Mapping
> 
> Thanks. I dont want to apply policy on all ingress interface of the PE to
> remark traffic. That's why I want to be sure on this TOS reflection..
> 
> If this is the case, is it safe enough to just do a policy-map on the  PE-
> to-P interface matching for the reflected EXP bits?
> 
> 
> 
> --- On Mon, 9/19/11, Mark Tinka <mtinka at globaltransit.net> wrote:
> 
> From: Mark Tinka <mtinka at globaltransit.net>
> Subject: Re: [c-nsp] 7200 DSCP-to-EXP Mapping
> To: cisco-nsp at puck.nether.net
> Cc: "Tony" <td_miles at yahoo.com>, "ar" <ar_djp at yahoo.com>
> Date: Monday, September 19, 2011, 12:26 AM
> 
> On Friday, September 16, 2011 12:29:53 PM Tony wrote:
> 
> > My understanding is that the 3 bits of the IP precedence
> > field are copied to the EXP as part of the MPLS
> > encapsulation. This is not platform (or even vendor)
> > specific.
> 
> I can confirm that.
> 
> Always best to mark your ingress packets with the right EXP
> value if you don't want surprises when queuing and
> scheduling happens upstream.
> 
> Mark.
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