Right there have to be some compromises Not that I would want to mess with it but.. Would it be possible with use of multi-topology isis -create one topology/point of view per node in ring?
adam -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Saku Ytti Sent: Wednesday, November 28, 2012 6:45 PM To: [email protected] Subject: Re: [c-nsp] IP LFA in ring topology On (2012-11-28 18:24 +0100), Adam Vitkovsky wrote: > Is it possible to tune metric on links in ring to get the most nodes > on the ring protected by the LFA? It's pretty easy to see how many boxes will be protected by just pen and paper. Just cross out link, and see if you'd return traffic back. Imagine following topology with identical metric everywhere. P1 | R1-R2-R3 | | R5----R4 Ir R5 <-> R4 gets outage, R5 does not have LFA to P1, as R4 would send towards R5. So no matter what metrics you choose in this topology, you have to compromise something as not everyone can have own best path to P1. Otoh If you have P1-----P2 | | PE2---PE3 PE boxes can get 100% coverage, as long as the connection between PE boxes is strictly backup or at most used to reach each end PE, not for transiting in non-fault scenario. -- ++ytti _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
