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

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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

Other related questions:
Which statuses does an MSTP interface have, and how does the interface process packets
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Which status may a protected group of the OceanStor ReplicationDirector be in?
A protected group of the OceanStor ReplicationDirector (mainstream version: V100R003C10) may be in one of the following statuses: 1. Normal: indicates that the protected objects in the protected group are under protection. 2. Disabled: indicates that the protected group is disabled. 3. Invalid: indicates that the protected group is not under protection because its protected objects have been modified, for example, storage devices are changed or the synchronization between two ends fails. In addition, after a protected group switchover, the protected group changes to the invalid state. 4. Locked: indicates that a migration is being implemented for the protected group as specified in the recovery plan and no operation can be performed on the protected group. 5. Executing: indicates that the protected group execution has been automatically or manually triggered and data is being synchronized.

Why is an OSPF-enabled interface on an S series switch in different states
Question: Why is an OSPF-enabled interface in different states? Answer: If a tunnel interface is created using the IP address of an OSPF-enabled loopback interface and the tunnel interface is Down, the interface is in different states. You can run the display ospf interface all command to check details about an OSPF interface. [HUAWEI]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

What are the rules for selecting routes belonging to different OSPF processes
OSPF supports multi-processes. Multiple OSPF processes can run on the same router independently. Assume that a router is configured with two OSPF processes: process 1 and process 2. They are independent of each other. Therefore, both of the routes belonging to process 1 and process 2 are advertised to the routing management (RM) module. Route selection between the two processes complies with the following rules: 1. The RM module checks the protocol preference of process 1 and process 2. The route belonging to the process with higher protocol preference is selected as the optimal route. NOTE: To set the preference of an OSPF route in the specified process, run the preference [ ase ] { preference | route-policy route-policy-name } * command. The default preference of an OSPF route is 10. When an ASE is specified, the default value is 150. 2. When the protocol preferences of the two processes are the same, the RM module compare the cost of the two routes. The route with smaller cost value is selected as the optimal route. NOTE: When selecting the optimal route, the RM module first compares the protocol preference. The RM module compares the cost of routes only when the protocol preferences are the same.

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