From: Lord, Chris (chris.lord@lorien.co.uk)
Date: Mon Jan 12 2004 - 20:56:57 GMT-3
Hi Group,
I would appreciate if someone could confirm my understanding of ISIS network types. I think there are only two types of ISIS hello pkt: P2P and Broadcast. Also there are no tuning parameters like the OSPF network command. So... if you have three routers on an NBMA frame-relay network all within the same subnet, it is my belief that you need fully meshed PVCs in order for the adjacencies to work properly (assuming you are not allowed to subdivide the subnet and use P2P subinterfaces everywhere).
I'm trying to do the IPExpert Lab 37 and they have a hub and spoke arangement where the hub has a multipoint frame-relay subinterface, the two spokes use the physical interface and are all running ISIS. I can't get this to work on my lab even though I've now copied the IPExpert solution acurately. As soon as I add an additional PVC between the two spokes to make the three routers fully meshed everything is ok which seems to confirm how I would expect ISIS to work.
My question is - have IPExpert produced an unworkable scenario or is ISIS more versitile than I thought?
Thx in advance,
Chris.
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