[c-nsp] How to effect a totally stubby area in IS-IS

[David Barak]

--- On Fri, 6/24/11, Jared Gillis <jared.a.gillis at gmail.com> wrote:
> Yes, I've been wondering if our needs are even possible
> with this topology in IS-IS, hence my hail-mary here.
> Our goal (and current config) is to only announce loops and
> interfaces between BB and POPs with IS-IS, everything else
> is in BGP. This does reduce the amount of prefixes learned,
> but we're trying to get it as low as possible since the POP
> routers are 3750MEs, which have limited TCAM, and our
> network is pretty large (90+ nodes and growing), plus we
> want to leave TCAM available for v6 in the future.

How about "advertise passive-only" and only put the loopbacks into ISIS at all?  Another possibility would be making L2 area boundaries between BB routers at some obvious regional divides - this would depend on how your BB-BB topology was built, but if it's some sort of partial mesh, then you should be able to figure out some good boundaries.

David Barak
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