Re: Multi-AS needs : draft-zhang-mpls-interas-te-req-02.txt

[Olivier Bonaventure <Bonaventure@info.ucl.ac.be>]

David,
> >
> > I think the latter is correct.
> > We need to extend a existing protocol(e.g. RSVP-TE) because a current
> > RSVP-TE can't cover an inter-AS TE.
> 
> What makes you say that?
> 
> I don't think current implementations can support this.  But RFC 3209
> includes inter-AS provisions.
> 
> See section 7.4.

The support of AS hops in the ERO is one part of the answer, but if
you want to support fast restoration of the interdomain links while preserving
the privacy requirement of ASes (i.e. not reveal detailed path inside an AS),
then RSVP-TE extensions are required.

You can find one proposal to extend RSVP-TE in

http://www.infonet.fundp.ac.be/doc/tr/Infonet-TR-2002-09.html
also available as an internet draft but without nice figures

another draft focussed on interdomain protection is
http://www.ietf.org/internet-drafts/draft-decnodder-mpls-interas-protection-00.txt

Olivier

-- 
CSE Dept. UCL, Belgium - http://www.info.ucl.ac.be/people/OBO/