Re: What is real ABR?
"Manral, Vishwas" <VishwasM@NETPLANE.COM> Tue, 04 March 2003 10:40 UTC
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Date: Tue, 04 Mar 2003 05:42:58 -0500
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From: "Manral, Vishwas" <VishwasM@NETPLANE.COM>
Subject: Re: What is real ABR?
To: OSPF@DISCUSS.MICROSOFT.COM
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Hi Igor, To answer your questions: - 1. Yes they are. The leaking of summary LSA's is given in section 12.4.3 RFC2328. " Note that only intra-area routes are advertised into the backbone, while both intra-area and inter-area routes are advertised into the other areas. " 2. Yes in case a router has active attachments to multiple areas, only the backbone summary LSA's are to be processed for routing table calculations. In this case no summary LSA's will be processed. Going through the document http://www.ietf.org/internet-drafts/draft-ietf-ospf-abr-alt-05.txt would be helpful to clear any doubts you have. Thanks, Vishwas -----Original Message----- From: Igor Miroshnik [mailto:IgorM@RADLAN.COM] Sent: Tuesday, March 04, 2003 3:55 PM To: OSPF@DISCUSS.MICROSOFT.COM Subject: What is real ABR? Ladies and Gentlemen, I have failed to find the answer in the archives. The question is what the behavior of ABR should be when it is neither physically connected to the backbone, nor having any configured virtual link. RFC2328 says such a router (having active interfaces to multiple areas) marks its router LSA with the bit B. Furthermore, as an ABR, the router originates summary LSAs and injects them into the attached non-stub areas. 1. Are the routes built by internal routers on the basis of those summary LSAs valid? Such inter-area routes pass between areas without the backbone mediation. 2. ABR should only process the backbone summary LSAs. The database of the router described has no backbone summary LSAs. Does it mean that this router cannot build inter-area routes? Thank you, Igor
- What is real ABR? Igor Miroshnik
- Re: What is real ABR? Manral, Vishwas