RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions
"Fabien Verhaeghe" <fabien.verhaeghe@marben-products.com> Mon, 09 March 2009 07:39 UTC
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From: Fabien Verhaeghe <fabien.verhaeghe@marben-products.com>
To: 'Adrian Farrel' <adrian@olddog.co.uk>, ccamp@ops.ietf.org
Subject: RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions
Date: Mon, 09 Mar 2009 08:39:20 +0100
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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
- RE: OSPF inter-AS extensions for GMPLS (RFC5392) … Fabien Verhaeghe
- Re: OSPF inter-AS extensions for GMPLS (RFC5392) … Adrian Farrel
- OSPF inter-AS extensions for GMPLS (RFC5392) ques… Fabien Verhaeghe