>Multi-area ISIS is really a CLNS topic. It is indeed not recommend >that one run multi-area for IP only routing. Some use in transition >networks may take place, but your better to simply interconnect with >a proper L2 backbone than merge areas.
First, let me be sure we are talking about the same thing. I think of multi-area as implying a backbone. Are you using it in the sense of multiple area identifiers in a level 1 area? > >The command clns routing is only required if you intend to route >clns. For IP only environments, it is not needed. In IP only, you >configure one NET per ISIS instance, and one ISIS instance per L1 >area you intend to form adjacencies within. The configs your >looking at on CCO likely include the command clns router isis on >each interface. I doubt there are many IP only multi-area configs >on CCO given it is not a recommended practise. The main application I've seen, for which there are some CCO documents, are telco applications when you are merging the CMIP infrastructure for several central offices or SONET control points, in order to reduce the requirement for L2 routers. Of course, CCIE lab usage and best current practices often are orthogonal at best, and in different space-time continuua at worst. :-) > >Pete > > >At 09:32 AM 1/4/2002 -0600, Michael C. Popovich wrote: >>I have double checked on Documentation CD regarding IS-IS and the need >>for CLNS. Peter is definitely right in the fact that CLNS is not >>required to route IP using IS-IS. This question is for Peter and anyone >>else with a good understanding of IS-IS. >> >>Reading through the Documentation CD on Integrated IS-IS I have a >>question regarding multi-area. The way I read it I am assuming that if >>you implement a multi-area IS-IS solution then you in fact do need to >>enable CLNS routing. Is this true? The examples given in the >>Documentation CD show that a single area IS-IS network doesn't need CLNS >>routing but in the multi-area scenario they have CLNS routing enabled. >>This isn't specifically addressed but I assume with the need for >>different areas using different NET addresses requires the CLNS >>protocol. >> >>Please correct me if I have misinterpreted this. >> >>Thanks, >> >>Michael Popovich Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=30957&t=30957 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
