Hi all, I'm having a problem with BFD, it looks like that it doesn't want to start. The BFD status still at Unknown even if it's configured under interfaces. I make some search on the net but to find any solution. I might miss something in my config... or anybody might get the same thing as me. Could you help to make BFD work? ===================== ! interface enp0s8 ip ospf network point-to-point ip ospf hello-interval 60 ip ospf dead-interval 240 ip ospf bfd 3 300 300 ! interface enp0s9 ip ospf network point-to-point ip ospf hello-interval 60 ip ospf dead-interval 240 ip ospf bfd 3 300 300 ! router01-ospf# show ip ospf nei detail Neighbor 2.2.2.2, interface address 169.254.0.2 In the area 0.0.0.0 via interface enp0s8 Neighbor priority is 1, State is Full, 5 state changes Most recent state change statistics: Progressive change 8m59s ago DR is 0.0.0.0, BDR is 0.0.0.0 Options 2 *|-|-|-|-|-|E|- Dead timer due in 3m00s Database Summary List 0 Link State Request List 0 Link State Retransmission List 0 Thread Inactivity Timer on Thread Database Description Retransmision off Thread Link State Request Retransmission on Thread Link State Update Retransmission on BFD: Type: single hop Detect Mul: 3, Min Rx interval: 300, Min Tx interval: 300 Status: Unknown, Last update: never Neighbor 2.2.2.2, interface address 169.254.1.2 In the area 0.0.0.0 via interface enp0s9 Neighbor priority is 1, State is Full, 5 state changes Most recent state change statistics: Progressive change 8m59s ago DR is 0.0.0.0, BDR is 0.0.0.0 Options 2 *|-|-|-|-|-|E|- Dead timer due in 3m00s Database Summary List 0 Link State Request List 0 Link State Retransmission List 0 Thread Inactivity Timer on Thread Database Description Retransmision off Thread Link State Request Retransmission on Thread Link State Update Retransmission on BFD: Type: single hop Detect Mul: 3, Min Rx interval: 300, Min Tx interval: 300 Status: Unknown, Last update: never router01-ospf# =====================