Re: IS-IS Flat Network Size
Mark Tinka via NANOG <[email protected]> Mon, 27 Jul 2026 20:40:30 +0200
| Newsgroups | gmane.org.operators.nanog |
|---|---|
| Message-ID | <[email protected]> |
On 27/07/2026 19:08, Tom via NANOG wrote: > Hello, > > I'm wondering what some practical/real experiences have been with building out a large flat IS-IS network. I've read a lot of threads on conjecture and older docs on what the vendors recommend but haven't found anything yet or real world examples. Two questions, > > 1) Is anyone running a flat IS-IS L2 network with approx 300 routers? If not, what is the higher end you've seen? > 2) On aggregation routers, what is the upper end of IS-IS adj to downstream routers? Would agg routers with approx 100 connections be an issue moving to IS-IS with the addition of keeping track of that many adj? With today's control planes, 300 nodes is not even a corn flake :-). We did that number back in 2009, on Cisco CRS-1's, ME3600X's and Juniper M320's, T320's and MX480's. The state-of-the-art has moved on a great deal, since then. Mark. _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/[email protected]/message/SCR7AOTLQUZCHITR2O4PFXDSB4QJ7MOD/