Question

Two routers, R1 and R2, are connected over a Frame Relay WAN link. OSPF is enabled on the multipoint interfaces of both routers, and Layer 3 connectivity has been verified with successful pings across the link. However, the OSPF adjacency never forms and no neighbor is listed with 'show ip ospf neighbor'. The interfaces default to the non-broadcast network type. What is the most likely reason the adjacency fails to establish?

Accepted Answer

The non-broadcast network type does not send multicast Hello packets, so neighbors must be defined manually with the 'neighbor' command

Answer

Non-broadcast interfaces elect a DR/BDR, which prevents multipoint adjacencies from forming

Answer

OSPF cannot operate over Frame Relay unless the interfaces are changed to point-to-point network type

Answer

The routers have mismatched process IDs, which stops the Hello exchange