[c-nsp] IS-IS Multiarea on 12.2 SR

[Mikael Abrahamsson]

On Sun, 8 Nov 2009, Mark Tinka wrote:

> Well, a route is a route. The difference between
> philosophies is just the volume.
>
> I get your point, but who's to say I won't have 10,000
> routers in production?

In order to detect loopbacks going away and using this to 
invalidate/remove next-hops quickly, you can't aggregate anyway.

Sorry, I have yet to hear someone describe an ISP network (designed as per 
ISP essentials, carry loopbacks in IGP and everything else in BGP), where 
IGP aggregation makes sense. If you have 10k routers in your IGP, well, 
you most likely did something wrong earlier in the process.

Also, with modern processorns and techniques such as partial tree 
recalculation in modern router OSes, I'm sure even 10k routers would be 
manageable in a single area.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se