Hi all, I try to configure 3 routers trying to talk to each on ospf NBMA. As you can see, i have put the serial interface on Master on point-to-multipoint and the other 2 router serial interface on point-to-point. After changing the hello-interval on Master, I still can't get the master to form a neighbor relationship with the 2 other router. It keep stuck on exchange state. Appreciate if anyone can advise on this. Master ===== interface Serial0/0.1 multipoint ip address 10.12.3.1 255.255.255.0 ip ospf network point-to-multipoint ip ospf hello-interval 10 frame-relay map ip 10.35.6.5 102 broadcast frame-relay map ip 10.35.6.6 103 broadcast Master#sh ip ospf int Serial0/0.1 is up, line protocol is up   Internet Address 10.12.3.1/24, Area 0   Process ID 1, Router ID 1.1.1.1, Network Type POINT_TO_MULTIPOINT, Cost: 64   Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 R2 === interface Serial0/0.1 point-to-point ip address 10.12.3.2 255.255.255.0 frame-relay interface-dlci 201 R2#sh ip ospf int Serial0/0.1 is up, line protocol is up   Internet Address 10.12.3.2/24, Area 0   Process ID 1, Router ID 2.2.2.2, Network Type POINT_TO_POINT, Cost: 64   Transmit Delay is 1 sec, State POINT_TO_POINT,   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 R3 === interface Serial0/0.1 point-to-point ip address 10.12.3.3 255.255.255.0 frame-relay interface-dlci 301 R3#sh ip ospf int Serial0/0.1 is up, line protocol is up   Internet Address 10.12.3.3/24, Area 0   Process ID 1, Router ID 3.3.3.3, Network Type POINT_TO_POINT, Cost: 64   Transmit Delay is 1 sec, State POINT_TO_POINT,   Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Master#sh ip ospf neighbor Neighbor ID     Pri   State           Dead Time   Address         Interface 3.3.3.3           1   EXCHANGE/  -    00:00:37    10.12.3.3       Serial0/0.1 2.2.2.2           1   EXCHANGE/  -    00:00:37    10.12.3.2       Serial0/0.1 ... View more