IS-IS questions

Sun Nov 24 00:56:04 UTC 1996

Hi.

I asked on comp.dcom.sys.cisco a few days ago about the advantages of
IS-IS over OSPF. Dave Katz replied that IS-IS has proven to be very
extensible while still allowing for backward compatibility. IS-IS was also
overhauled around the same time that a lot of ISPs were building their
networks.

My questions are these. When is a good time to use IS-IS? Should an ISP
that wants to build a scalable network go with IS-IS right now? Or is
there a certain point where IS-IS becomes desirable over OSPF? Is there
ever such a point? I would think it is better to pick an IGP and stick
with it.

Thanks for any comments.

-BD