On 15 Apr 2004, at 06:13, Chris Hellberg wrote:
Large networks all over the world run IS-IS. You won't find an abundance of information on the protocol as you would with OSPF (especially such as John Moy's OSPF book), however it's still a very popular IGP.
There's an interesting draft on the differences between OSPF and ISIS which probably wouldn't have been written if IS-IS wasn't used a whole heap:
http://ftp.apnic.net/ietf/internet-drafts/draft-bhatia-manral-diff- isis-ospf-00.txt
As for what networks are running what protocol, you're unlikely to get too much on that sort of info.
AOL's transport network runs IS-IS (there was a presentation about their transition from OSPF at a semi-recent NANOG). MFN/AboveNet did a similar transition while I was there. We run IS-IS as our IGP in our home network (AS 3557), although we still use OSPF in local-scope anycast clusters since it's more straightforward to find ways of supporting it on FreeBSD. Joe