RFC 2370 Update and a Proposed Change to Stub Area Behavior
Acee Lindem <acee@CISCO.COM> Tue, 03 May 2005 14:43 UTC
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Date: Tue, 03 May 2005 10:43:08 -0400
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From: Acee Lindem <acee@CISCO.COM>
Subject: RFC 2370 Update and a Proposed Change to Stub Area Behavior
To: OSPF@PEACH.EASE.LSOFT.COM
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In the evolution of the OSPFv2 protocol specification (RFC 1247->RFC 1583 -> RFC 2178 -> RFC 2328) numerous bugs were fixed and some protocol behaviors were altered. Examples include the metric cost for area ranges and the selection of the ASBR for AS external route computation. In the context of documenting the OSPFv3 NSSA differences I've looked again at section 2.10 and I really think the idea of not flooding unknown LSA types with the U-bit set to 1 is broken. I think it breaks the whole idea of being able to introduce new LSA types in a backward compatible fashion. Furthermore, it won't stop the leakage of these unknown LSAs when some routers understand them and others do not - it all depends on whether you have a spanning tree of routers that understand them. Since the LSAs in question are area scoped or link scoped, it implies that at least one router (the originator) understands the new type and you will have a mixture. IMHO, this is broken. I've had some discussions with others who agree. At this juncture, we have 3 alternatives: 1) Remove the restriction for that unknown LSAs with the U-bit set to 0 for stub areas. 2) Extend the broken restriction to NSSAs in the update. 3) Limit the damage to stub areas and only restrict AS scoped LSAs from NSSAs. Of course, I'd vote for #1 or I wouldn't be sending this E-mail. Thanks, Acee
- RFC 2370 Update and a Proposed Change to Stub Are… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Erblichs
- Re: RFC 2370 Update and a Proposed Change to Stub… Dave Katz
- Re: RFC 2370 Update and a Proposed Change to Stub… Mike Fox
- Re: RFC 2370 Update and a Proposed Change to Stub… Andrew Smith
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Erblichs
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem
- Re: RFC 2370 Update and a Proposed Change to Stub… Sina Mirtorabi
- Re: RFC 2370 Update and a Proposed Change to Stub… Russ White
- Re: RFC 2370 Update and a Proposed Change to Stub… Acee Lindem