Re: ds2exp; a possible mapping [was Re: [mpls-linux-general] Re: MPLS-Diffserv Instructions + Counters]

[Stefano A. <avi...@li...>]

Hi all

> > ds2exp:0x38:0xa:1:0x12:2:0x1a:3:0x22:4:0x2e:5
> >
> > This maps:
> > AF1x -> 1
> > AF2x -> 2
> > AF3x -> 3
> > AF4x -> 4
> > EF -> 5

based on my understanding of draft-ietf-mpls-diff-ext-09.txt, I have some doubts about the utility of the above mapping, unless we want to disregard the drop probability (the above 'x').
According to me, if we want to set up an E-LSP we must encode the full DSCP into the EXP bits (otherwise we lose the drop probability); if we want to set up an L-LSP (which carries packets of a given PSC, e.g. AF1 or AF2) in the EXP bits we should encode just the drop probability.

Please correct me if I'm wrong

Regards,
Stefano