OSPF config On None Broadcast Mode over Frame-Relay

All 3 routers are using the default none broadcast mode on their frame-relay interfaces, so neighboring routers must be manually configured on DR, in this case is R1. We manually changed the OSPF priority on the interface level with the command ip ospf priority 0 on R2 and R3 so router 1 can become a DR

As you see here all 3 routers formed adjacency and R1 was chosen as DR