DSCP in MPLS over GRE

[Francois Lieuze]

Hello Guys,

I'm using MPLS over GRE. The same router (an ISR 4k) is performing label imposition and tunneling.

From my understanding, Cisco IOS-XE default behavior for MPLS over GRE encapsulation is the following:

• Copy IP precedence bits into MPLS EXP bits during label imposition
• Copy MPLS EXP bits into IP precedence bits of the GRE envelope

But what if I want to have the same DSCP in my GRE envelope as in my original IP packet ? Is there a way to do that ?

Thanks a lot for your answers. BR,

François

[Joseph W. Doherty]

Hmm, don't see how as long as you transition through MPLS, as MPLS only provides 3 bits for ToS.