nanog mailing list archives
Re: OSPF multi-level hierarchy: Necessary at all?
From: Alex Zinin <zinin () amt ru>
Date: Fri, 28 May 1999 14:26:27 +0400
At 11:35 27.05.99 -0700, Vadim Antonov wrote:
...but the main question is whether there is a demand for it or not.I guess the answer is pretty much not. The amount of interior routing information in a properly designed backbone is quite small even if there is no two-layer abstraction.
If you do not use route-summarization on the area borders, your're gonna have flat network from the routing info's point of view, even though the topology info is abstracted. Flat networks are very well known to be not scalable.
(Now, the _exterior_ information is aplenty, but OSPF is useless for it anyway).
The new approach could incorporate aggregating externals on level borders in addition to aggregating internal routing info.
If someone proposed simplifying and cleaning up OSPF i'd be quite for it. Building a protocol allowing to get rid of iBGP hack would also help :)
In OSPFv6 an ASE-LSA can point to another LSA, which per D. Ferguson can contain BGP path attributes. The new approach (which could be intergrated in OSPF for IPv6 btw) could use a technique analogous to this one. Rgds ------------------------------------------------------------------ Alex D. Zinin, Consultant CCSI #98966 CCIE #4015 AMT Group / ISL Cisco Systems Gold Certified Partner http://www.amt.ru irc: //EFNET/#cisco, //irc.msn.com/#NetCisco [Ustas]
Current thread:
- Re: OSPF multi-level hierarchy: Necessary at all?, (continued)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 27)
- Re: OSPF multi-level hierarchy: Necessary at all? Vadim Antonov (May 27)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 27)
- RE: OSPF multi-level hierarchy: Necessary at all? Jessica Yu (May 27)
- Re: OSPF multi-level hierarchy: Necessary at all? Vadim Antonov (May 27)
- Re: OSPF multi-level hierarch: side question Steve Meuse (May 28)
- Re: OSPF multi-level hierarch: side question Alex P. Rudnev (May 28)
- Re: OSPF multi-level hierarch: side question Steve Meuse (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Vadim Antonov (May 27)
- Re: OSPF multi-level hierarchy: Necessary at all? Sean Donelan (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex Zinin (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Jessica Yu (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Jessica Yu (May 28)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 31)
- Re: OSPF multi-level hierarchy: Necessary at all? Alex P. Rudnev (May 28)