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RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions
Hi Adrian,
See in-line
> Hi Fabien,
>
> > Sorry to come a little late on this but I have a question on inter-AS
> > extensions RFC5392 (also applicable on ISIS extensions).
> > In section 4:
> > " Only some essential TE information for the link needs to be
> > advertised; i.e., the Link Type, the Remote AS number, and the Remote
> > ASBR ID."
> >
> > First what does "remote" mean here? is it remote in the context of the
> > proxied link or in the context of the Router?
> > i.e.
> >
> > RouterA in AS1 ------TE Link------ RouterB in AS2
> >
> > I guess it is in the context of the link. That is in LSA generated by
> > router
> > A for B->A link (proxied) we put AS1 and routerA ASBR Id. Is that
> correct?
>
> Yeah, you could say "in the context of the router." Or even "in the
> context
> of the IGP instance". Since the IGP will only be running in one AS, the
> advertising router is talking about the IDs of the "other" AS and ASBR.
>
Sorry but I am still a little bit confused.
Router A generates 2 LSAs for a TE link between A and B.
One for A->B direction and one for B->A direction (because B is in a
separate IGP).
Are you saying that in both LSAs the remote AS number sub TLV is set to
Router A's AS?
If yes what I don't get is how other routers in this AS knows which LSA
corresponds to A->B direction and which one corresponds to B->A direction.
That is why I thought "remote" in the text mentioned in my first email
refers to the "link context". Then both LSAs would contain different remote
AS/ASBRId so that we can tell which one corresponds to each direction.
Please let me know if I miss something...
Thanks
Fabien