=?gb2312?B?u9i4tA==?=:RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions
MachChen 55527 <mach@huawei.com> Mon, 09 March 2009 13:22 UTC
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Date: Mon, 09 Mar 2009 21:22:07 +0800
From: MachChen 55527 <mach@huawei.com>
Subject: 回复:RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions
To: Fabien Verhaeghe <fabien.verhaeghe@marben-products.com>
Cc: 'Adrian Farrel' <adrian@olddog.co.uk>, ccamp@ops.ietf.org
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Hi Faibien, Sorry about the confusion. ----- 原邮件 ----- 发件人: Fabien Verhaeghe <fabien.verhaeghe@marben-products.com> 日期: 星期一, 三月 9日, 2009 下午3:41 主题: RE: OSPF inter-AS extensions for GMPLS (RFC5392) questions 收件人: 'Adrian Farrel' <adrian@olddog.co.uk>, ccamp@ops.ietf.org > 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? No, for A->B direction, the remote AS number sub_TLV is set to Router B's AS, and for B->A direction, it is set to Router A's AS. I think it more accurate to say "in the context of the router or proxied router" or even "in the context of the IGP instance or proxied IGP intance" :-) For me, "in the context of the link" is also OK. > > If yes what I don't get is how other routers in this AS knows which > LSAcorresponds 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. > Correct. > Please let me know if I miss something... > > Thanks > Fabien > > > Best regards, Mach
- =?gb2312?B?u9i4tA==?=:RE: OSPF inter-AS extension… MachChen 55527