Why does the interface of an OSPF process have different statuses simultaneously

If a tunnel interface and a loopback interface run OSPF and the tunnel interface borrows the address of the loopback interface, when the tunnel interface becomes Down but the loopback interface works normally, the problem occurs. You can run the display ospf interface all command to view the details.

display ospf interface all
OSPF Process 1 with Router ID 1.1.1.1
Interfaces
Area: 0.0.0.0 (MPLS TE not enabled)
Interface: 1.1.1.1 (LoopBack0)
Cost: 1 State: DR Type: Broadcast MTU: 1500
Priority: 1
Designated Router: 1.1.1.1
Backup Designated Router: 0.0.0.0
Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1
Interface: 1.1.1.1 (Tunnel0/0/1)
Cost: 1562 State: Down Type: P2P MTU: 1500
Unnumbered
Timers: Hello 10 , Dead 40 , Poll 120 , Retransmit 5 , Transmit Delay 1

Scroll to top