>Yes its that IS-IS question again.
>
>I am at the moment working on a National Management Network. Marconi
>telecomms switches (SDH muxes) only talk to each other using the favourite
>IS-IS protocol. Most of the design features / problems have been done BUT
>there is one question that remains unanswered. HOW many Level 2 only
>routers can you have in one area.
If they are using IS-IS under CMIP, they only talk L1.
>
>The situation is because the SDH is obviously in rings then the areas cannot
>be geographically based. One ring can stretch through around 30 node sites.
>There is more than one ring in each site (diversity). Anyway, the design is
>going to be that all of the Cisco routers will be logically THE ISIS core
>with the marconi ad-muxes the distribution layer (L1-L2) and the elements
>on the ring the access layer (L1 only). This will then cause there to be
>around 100 routers in the core all at LEVEL 2.
>
>Does anyone know out there how many routers you can have in one area. I
>have tried the Advanced IP Design and Routing TCP/IP volumes which were
>advised from past emails (thanks Howard).
In the real world, I know of several provider networks that are
operational with 1000 or more IS-IS routers in a single area. I will
emphasize that these networks are very well designed from a physical
reliability standpoint, and don't thrash often.
There's no hard limit to the number of L2 routers. In Cisco's
implementation, there is a limit of three NSAP prefixes per L2 router
box, and one prefix per interface.
I really have to find some place to post the tutorial I didn't
present at NANOG. If you go to www.nanog.org, and navigate to the
last meeting, there is also a presentation by Dave Katz. Dave works
for Juniper now, but wrote or modified most of the IS-IS code in the
Internet...in fairness, Shantam Biswas wrote the first Bay RS IS-IS
code.
>
>Any help as per usual will be well received.
>
>Cheers
>
>Robert McCallum
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