[c-nsp] MPLS EXP label imposition

[Aly, Yasser]

Hi Oliver,

 I wonder how traffic locally generated by a router is treated in terms
of setting MPLS EXP value according to the type of traffic (For example:
Telnet from within a router, routing updates, and so forth).

How to set MPLS EXP value for locally generated traffic inside a router.

Regards,
Yasser

-----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: Thursday, September 08, 2005 6:38 PM
To: Merlin Gillespie; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] MPLS EXP label imposition 

Merlin Gillespie <> wrote on Thursday, September 08, 2005 4:09 PM:

> Following reading:
> http://www.cisco.com/warp/public/cc/pd/iosw/tech/mpotc_qp.htm
> 
> The following passage was brought to my attention:
> 
> By default, Cisco IOS(r) Software copies the three most significant
bits
> of the DiffServ code point (DSCP) or the IP precedence of the IP
> packet to the EXP field in the MPLS shim header.
> 
> There is not much reference to this feature outside of the prior
> mentioned document.
> Can someone confirm that this is the default behaviour.

Yes, it is (I figure it is in most MPLS devices).

> If it is the default behaviour whether there is a global configuration
> to prevent this from happening.
> Or, if the only way to prevent this from happening is to manually
> rewrite all precedence bits to 0.

You can use the "MPLS DiffServ Tunneling Modes" feature
(http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newf
t/122t/122t13/ftdtmode.htm) and overwrite this with an appropriate
policy-map with "set mpls experimental 0" applied on the ingress
interface..

	oli

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