[c-nsp] is-is question

victor vitya at list.ru
Wed May 13 15:32:23 EDT 2009

Because of a recent change of the organizational structure of the company  
I'm employed by I was given an order to migrate all the current routing  
infrastructure (a couple of c7604, c7201 and a dozen of c4924) from OSPF  
to is-is. I've never worked with is-is before and after a bit of studying  
I feel comfortable enough with the concept and a possible migration  
strategy. The only question I have so far is what is-is level should I  
prefer? With OSPF all devices reside in Area 0. Naturally the closest  
match from is-is world would be to configure only one level-1 area. But  
during my search the web for the best practices I saw somewhere that with  
the same result I could put each device into  separate areas configuring  
only level-2 interarea routing and completely abandon idea of level-1.
I'd very much like to hear your opinion on this matter.

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