Mikael Abrahamsson wrote: > 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.
While I agree with these statements, our issue is not tree recalculation/convergence. Our issue and driving need for IS-IS multiarea is the fact that we have 3750ME's which can only hold ~2k routes in the TCAM in our IS-IS domain, and we'll very rapidly exhaust the TCAM unless we can do route summarization (i.e. upstream L2's send default/ATT only). -Jared _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
