I started wondering if it was possible to get a functional OSPF neighborship between two routers without a PVC connecting them in a one-subnet-three-routers-over-frame-relay topolgy (first attachment, GNS3 topology and configurations files using c3745-adventerprisek9-mz.124-25d.image). Even I was able to ping the second router via the third router with static frame relay mapping, no Hello OSPF packet were received by the second router. Apparently, the third router dropped Hello packets and sent back an ICMP type 11 (Time-to-live exceeded).
Pursuing my reasoning, I started an other configuration with a three-routers-two-subnet-over-ethernet topology (second attachment). Again, I tried to get a functional OSPF neighborship through a third router using static IP route and configuring "non-broadcast" network type. But in this case, routers not even sent OSPF Hello packet. I supposed that IOS was dropping these Hello packets.
So my question is why Cisco IOS is dropping packets in each topology and how I can observe these drop on Cisco IOS ?
Ok for the inarp discovery at R2, I'm not familiar with frame relay mumbo jumbo, seems to work fine =)
Then if you configure NBMA on all routers, add neighbors manually, and give highest priority to R2 (hub router), lower to spokes R1 and R3 with "ip ospf priority 0", it should work (assuming that R2 as effective connectivity to R1 and R3)
If each router can see every other one thru a specific DLCI, every router could be used as DR (as the topology is full meshed).
But not seeing any DLCI definition in R1 or R3 to reach R2 confuses me (not familiar, etc...).
On Ethernet, being by nature a broadcast media, dunno if configuring NBMA could cause side effect.
Anyway in a NBMA domain, all your routers should be in the same subnet.
I'm not sure I understand what you're trying to do on Ethernet, as R2 doesn't run OSPF. Kinda trying to set an OSPF adjacency on a multihop model between R1 and R3 thanks to static routes ? For me it doesn't match OSPF design : each router must be advertised as a LSA type 1, and on multiple access networks one router, the DR, advertise the network with its type (NBMA, p2p, ...), and other attributes, in a LSA type 2.
2 neighbors must talk through the same layer 2 direct topology,the only exception I know being virtual links.
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