I just want to make sure I understand this correctly:
I know that, when configuring OSPF, if interface type is "point-to-multipoint" for example, no DR/BDR and no neighbor command is required for proper OSPF operation.
I just want to confirm that it is true even when I am configuring "point-to-multipoint" on Frame-Relay, which is NBMA?
When configuration OSPF, if the OSPF Network Type (not the interface) is point-to-multipoint, you won't have DR/BDR election in the segment and no neighbor command is required.
Frame-Relay does not have a 'point-to-multipoint' interface, it has 'multipoint' or 'point-to-point'
R1(config)#int s0/0.111 ?
multipoint Treat as a multipoint link
point-to-point Treat as a point-to-point link
and enabling OSPF on a multipoint subinterface produces the same result as enable OSPF on the main interface under frame-relay, the OSPF network type will be Non-broadcast.
R1#sh run int s0/0.123
Current configuration : 130 bytes
interface Serial0/0.123 multipoint
ip address 192.168.123.2 255.255.255.0
frame-relay map ip 192.168.123.3 203 broadcast
R1#sh ip os int
Serial0/0.123 is up, line protocol is up
Internet Address 192.168.123.2/24, Area 0
Process ID 1, Router ID 192.168.123.2, Network Type NON_BROADCAST, Cost: 64