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
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