Re: what is the fundamental difference between OSPF and IS-IS?
Erblichs <erblichs@EARTHLINK.NET> Fri, 23 August 2002 16:35 UTC
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Date: Fri, 23 Aug 2002 09:49:12 -0700
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From: Erblichs <erblichs@EARTHLINK.NET>
Subject: Re: what is the fundamental difference between OSPF and IS-IS?
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Bin Liu, I will assume that The two biggest differences in my opinion are: 1) IS-IS is a pure SPF computation based LS protocol. IS-IS : Routes computed between L2 to L2 routes in IS-IS are link-state / SPF computations. L1 routers have no direct outside area connection. L2 routers have that direct connection. Yes, a router can be a L1/L2 router. OSPF : Like routes (non-local) within OSPF are distance vector computation. 2) Neighbor to adjacency formation process. OSPF : Uses a heavy weight process to initially synchronize its link state databases for adjacencies. Then it uses flooding to keep them synchronized. IS-IS : Uses complete and partial link-state protocol data units which describe every LSP in the database and are periodicly multicasted. Mitchell Erblich Ex-Extreme Networks IS-IS Software Developer. ============================================= "Liu B." wrote: > > Hello everyone, > > Thanks for answering my previous questions. I am reading RFC 1142 (OSI IS-IS > Intra-domain Routing Protocol), in order to compare OSPF with IS-IS. There > are so many common things between two of them, such as area routing, virtual > link, designated router ... what is the fundamental difference (or > improvement?) between OSPF and IS-IS? > > Thanks again for all your helps. > > Bin Liu
- what is the fundamental difference between OSPF a… Liu B.
- Re: what is the fundamental difference between OS… Arthur Dimitrelis
- Re: what is the fundamental difference between OS… Arthur Dimitrelis
- Re: what is the fundamental difference between OS… Felix Lin
- Re: what is the fundamental difference between OS… Barry Friedman
- Re: what is the fundamental difference between OS… Arthur Dimitrelis
- Re: what is the fundamental difference between OS… Erblichs
- Re: what is the fundamental difference between OS… Radia Perlman - Boston Center for Networking