The MPLS WG Archive

[Francois Le Faucheur <flefauch@cisco.com>]

Francis,
The targetted scenario is 2) [ two sub-clouds of a single Diff-Serv domain
interconnected through an MPLS cloud ]. But I think you could make it work
for 1) assuming, as you said, that you do the right DSCP translation.
Francois

At 10:30 25/11/2000 +0100, Francis Arts wrote:
>
>Hello,
>
>I have a question concerning the draft-ietf-mpls-diff-ext-07.txt draft.
>
>Section 2.6.2, p.13 of this draft states the following:
>
>"The Pipe Model is particularly appropriate to environments in which
>the incoming interface of the LSP Ingress and the outgoing interface
>of the LSP Egress are in Diff-Serv domains which use a common set of
>Diff-Serv service provisioning policies and PHB definitions, while
>the LSP spans one (or more) Diff-Serv domain(s) which use(s) a
>different set of Diff-Serv service provisioning policies and PHB
>definitions."
>
>
>This statement could be interpreted in 2 ways. Which one is correct:
>
>1) The 2 diff serv domains connected by the LSP use the same PHBs but
>may use a different DSCP encoding of the PHB. If a different DSCP
>encoding is used, a translation needs to be done at either end.
>
>2) The 2 diff serv domains connected by the LSP use the same PHBs and
>the same
>DSCP encoding of the PHB.
>
>
>
>Thanks for your answer.
>
>Kind regards,
>
>    Francis.
>