OSPF over NBMA

R1 is the Frame Relay. R2 is the hub. R2 and R3 are point-to-point frame-relay. R2, R4 and R5 are multipoint frame-relay. R2 and R3 belong to 10.10.10.0/30. R2, R4 and R5 are 192.168.100.0/29.

R2 hub router

interface Serial1/0
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
interface Serial1/0.102 point-to-point
 ip address 10.10.10.1 255.255.255.252
 frame-relay interface-dlci 102
end
interface Serial1/0.103 multipoint
 ip address 192.168.100.1 255.255.255.248
 ip ospf priority 10
 frame-relay interface-dlci 103
 frame-relay interface-dlci 104
end
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 passive-interface default
 no passive-interface Serial1/0.102
 no passive-interface Serial1/0.103
 network 10.10.10.1 0.0.0.0 area 0
 network 192.168.100.1 0.0.0.0 area 0
 neighbor 192.168.100.2
 neighbor 192.168.100.3

R3 spoke (point-to-point)

interface Serial1/0
 no ip address
 encapsulation frame-relay
 serial restart-delay 0

interface Serial1/0.201 point-to-point
 ip address 10.10.10.2 255.255.255.252
 frame-relay interface-dlci 201
end

router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
 passive-interface default
 no passive-interface Serial1/0.201
 network 10.10.10.2 0.0.0.0 area 0

R4 spoke (multipoint)

interface Serial1/0
 no ip address
 encapsulation frame-relay
 serial restart-delay 0
 
interface Serial1/0.301 multipoint
 ip address 192.168.100.2 255.255.255.248
 ip ospf priority 0
 frame-relay map ip 192.168.100.3 301 broadcast
 frame-relay interface-dlci 301
end
router ospf 1
 router-id 4.4.4.4
 log-adjacency-changes
 passive-interface default
 no passive-interface Serial1/0.301
 network 192.168.100.2 0.0.0.0 area 0

R5 spoke (multipoint)

interface Serial1/0
 no ip address
 encapsulation frame-relay
 serial restart-delay 0

interface Serial1/0.401 multipoint
 ip address 192.168.100.3 255.255.255.248
 ip ospf priority 0
 frame-relay map ip 192.168.100.2 401 broadcast
 frame-relay interface-dlci 401
end
router ospf 1
 router-id 5.5.5.5
 log-adjacency-changes
 passive-interface default
 no passive-interface Serial1/0.401
 network 192.168.100.3 0.0.0.0 area 0

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