1. You cannot, even with the Multiarea feature , configure 250 Areas per router.
2. Other options would be something like this.
Have your 3662 be in one area
Have routers that terminate your Atm pvc (Assume this is the case) be in
one of your 250 management areas (L2 only to the 3662 and L1 to your
3. 1 is not a viable solution since that many (250) areas cannot be defined on one router. Devices in one area do not cache things within another outside of it's own area. L1 devices within an area only know about devices within and the router, that will allow it outside of it's area by using the Attach bit in the LSP.
Three areas can be supported normally without multiarea feature enabled on a router. Multiarea will allow up to 20 something areas but only one L2 instance and all the rest are L1 only.
Bridging in your solution would make me very nervous, in your solution. I would say that you could terminate all 250 ISO devices (assuming they could all play in 1 (or up to 3 areas) area with L1's to each. 250 ESs are alot but should be able to work.
My intial proposal with having your 3660 in one area L2 to the rest of your routers and L1 from your routers to your end devices is the way I would do it. This would enable Multiarea support and conform to ISO design.
We currently have an OSI network based on the "Cisco" model, but run ISO-IGRP within its core to allow for filtered re-distribution between ISIS and ISO-IGRP and works well.
However with the introduction of these new network elements, they have introduced difficulties when trying to integrate them into our current network, hence the options of exploring other alternatives.
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