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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Why Is an Interface in Down State?

Why Is an Interface in Down State?

If the indicator of a connected interface on CE series switches is off, the interface does not go Up. Run the display interface command on the device to view the interface status.

<HUAWEI> display interface 10ge 1/0/1
10GE1/0/1 current state : DOWN (ifindex: 3303)                                  
Line protocol current state : DOWN                                              
  ---- More ----  

In the preceding command output, the current state field displays Down, indicating that the interface cannot work properly.

Common Causes

The possible causes are as follows:

  • The interface is manually shut down.
  • The cable or optical fiber is faulty.
  • The optical module is faulty.
  • The local and remote interfaces fail to negotiate parameters including the duplex mode and rate.

Troubleshooting Procedure

  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. If the interface is still Down, replace the optical module and optical fiber or cable on the interface to check whether the interface, optical module, or optical fiber/cable has failed.

  3. Check whether the negotiate parameters including the duplex mode and rate.of local and remote interfaces are same. If not, change them to same.

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

Updated: 2020-01-07

Document ID: EDOC1000060766

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