Why is an interface in Down state on a CE series switch

0

If the indicator of a connected interface on a CE series switch is off, the interface does not go Up. You can run the display interface command on the switch to view the interface status.

Common causes:
1. The interface is manually shut down.
2.The cable or optical fiber is faulty.
3. The optical module is faulty.
4. The local and remote interfaces fail to negotiate parameters including the duplex mode and rate.

Recommended solutions:
1. Check whether the interface has been manually shut down using the shutdown command. If so, run the undo shutdown command in the interface view to enable the interface.
2. Connect the interface to another interface, and replace the optical module, optical fiber, or cable on the interface to check whether the interface, optical module, or optical fiber/cable is faulty.

If the fault persists, see section "Interface Troubleshooting" in the Troubleshooting - Hardware.

Other related questions:
The physical state of a serial interface is Up but the protocol state of the interface is Down
For the problem that the physical state of a serial interface is Up but the protocol state of the interface is Down, see the troubleshooting guide. For details, access the URL in the right column.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

What should I do when a CE series switch license file changes to the trial state
If a license in trial state expires, successfully delivered configurations of a licensed feature will be retained and take effect. You are allowed to delete existing service configurations related to the licensed feature, but not to add new configurations. Therefore, apply for a new license and activate it before the current license expires. Otherwise, services will be affected.

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

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top