I believe ISIS DIS election is based upon priority and then SNPA (MAC or DLCI), and not loopback IPs.
Anyway, I wonder if the problem might be that your hub router is using the main interface as opposed to a point-to-multipoint sub-interface. Eric On Thu, Mar 31, 2011 at 9:50 AM, Vitkovsky, Adam <[email protected]>wrote: > Hi there, > > > > I have hub and spoke topology over main serial interfaces on hub and spokes > and ISIS L1 running through > > Name loopback int-ip > > R1 1.1.1.1 10.0.0.1 > > R2 2.2.2.2 10.0.0.2 > > R3 3.3.3.3 10.0.0.3 > > R4 4.4.4.4 10.0.0.4 > > > > ISIS should behave as on broadcast medium in this setup –hub has the > highest loopback ip 4.4.4.4 so it became a DIS and is indeed sending the > CSNP periodically > > After initial convergence all the routers have the same topology tables > with all the router’s loopback IPs > > > > Problem is only the hub loopback ip makes it into the routing table on > spokes > > > > Hub has all 3 spoke’s loopbacks in its routing table -no issues there and > I’m able to ping hub’s loopback from each spoke > > > > -the only thing I could think of was that maybe on broadcast medium isis > won’t install prefixes from routers with which it doesn’t have an adjacency > > (cause isis forms an adjacency with all the routers on b-cast medium –but > for nbma it’s not –so only prefixes from hub where installed in RIB) > > > > Please let me know your thoughts > > Thank you very much > > > > ---------------- > > Spoke conf: > > interface Serial1/0 > > ip address 10.0.0.1 255.255.255.0 > > ip router isis 1 > > encapsulation frame-relay > > serial restart-delay 0 > > frame-relay map ip 10.0.0.4 104 > > frame-relay map clns 104 broadcast > > no frame-relay inverse-arp > > ! > > router isis 1 > > net 49.0001.0000.0000.0001.00 > > is-type level-1 > > log-adjacency-changes all > > passive-interface Loopback0 > > > > ---------------- > > hub config: > > interface Serial1/0 > > ip address 10.0.0.4 255.255.255.0 > > ip router isis 1 > > encapsulation frame-relay > > serial restart-delay 0 > > frame-relay map clns 403 broadcast > > frame-relay map clns 402 broadcast > > frame-relay map clns 401 broadcast > > frame-relay map ip 10.0.0.3 403 broadcast <-the broadcast keyword doesn’t > need to be there > > frame-relay map ip 10.0.0.2 402 broadcast > > frame-relay map ip 10.0.0.1 401 broadcast > > no frame-relay inverse-arp > > ! > > router isis 1 > > net 49.0001.0000.0000.0004.00 > > is-type level-1 > > log-adjacency-changes all > > passive-interface Loopback0 > > > > > > > > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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