1. Run the display this command in the interface view to check whether the local or remote interface is shut down. In the case of a sub-interface, you need to check whether a VLAN ID has been configured on the sub-interface and its peer sub-interface.
   • If either interface is shut down, run the undo shutdown command to enable the interface.
   • If no interface is shut down, go to Step 2.

2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the local or remote interface is Down.
   • If either interface is Down, run the undo shutdown command in the interface view, and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If the interface status is Up, go to Step 2.

2. Run the display interface eth-trunk command in the system view to check whether the number of local and remote interfaces that are added to an Eth-Trunk is greater than the upper threshold for the number of member links.
   • If the number of local and remote interfaces that are added to the Eth-Trunk is greater than the upper threshold for the number of member links, run the max active-linknumber command in the Eth-Trunk interface view to configure a proper upper threshold for the number of member links, and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 4.
   • If the number of local and remote interfaces that are added to the Eth-Trunk is smaller than the upper threshold for the number of member links, go to Step 3.

3. Run the display interface eth-trunk command in the system view to check whether the number of local and remote interfaces that are added to an Eth-Trunk is smaller than the lower threshold for the number of member links.
   • If the number of local and remote interfaces that are added to the Eth-Trunk is smaller than the lower threshold for the number of member links, run the least active-linknumber command in the Eth-Trunk interface view to configure a proper lower threshold for the number of member links, and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 4.
   • If the number of local and remote interfaces that are added to the Eth-Trunk is smaller than the lower threshold for the number of member links is greater than the lower threshold of member links on the Eth-Trunk interface, go to Step 4.

4. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display this command in the interface view to check whether the local end is a server end (authenticating end) or a client end (authenticated end).
   • If the local end is the server end, check whether the user and password configured on the remote end are correct. If they are incorrect, run the local-user password command in the AAA view to re-configure them. Then, check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If the local end is the client end, run the display this command to check whether the user and password configured on the local end are correct. If they are incorrect, run the local-user password command in the AAA view to re-configure them. Then, check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display this command in the interface view to check whether the local end is a server end (authenticating end) or a client end (authenticated end).
   • If the local end is the server end, check whether the user and password configured on the remote end are correct. If they are incorrect, run the local-user password command in the AAA view to re-configure them. Then, check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If the local end is the client end, run the display this command to check whether the user and password configured on the local end are correct. If they are incorrect, run the local-user password command in the AAA view to re-configure them. Then, check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the PPP protocol of the remote device is works properly.
   • If the PPP protocol of the remote device works properly, run the display interface command to check the physical link statuses of the devices (including the intermediate device), such as the number of lost packets and error packets. If the physical link statuses are normal but the alarm is not cleared, go to Step 2.
   • If the PPP protocol of the remote device works improperly, contact the engineer responsible for the remote device to rectify the fault. If the fault is rectified but the alarm is not cleared, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display efm session command in the system view to check whether the EFM state field is displayed as Detect.
   • If the EFM state field is displayed as Detect, go to Step 3.
   • If the EFM state field is not displayed as Detect, go to Step 2.

2. Run the display efm command in the system view to check whether the EFM enable flag field is displayed as enabled.
   • If the EFM enable flag field is displayed as enabled, recheck the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the EFM enable flag field is not displayed as enabled, run the efm enable command in the interface view and system view. Then, check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the physical link status of the tunnel interface is Down.
   • If the physical link status of the tunnel interface is Down, run the undo shutdown command in the interface view to enable the interface, and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If the physical link status of the tunnel interface is Up, go to Step 3.

2. Check whether the physical link of the tunnel interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link of the tunnel interface works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link of the tunnel interface works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display this command in the interface view to check whether the local or remote interface is shut down. In the case of a sub-interface, you need to check whether a VLAN ID has been configured on the sub-interface and its peer sub-interface.
   • If either interface is shut down, run the undo shutdown command to enable the interface.
   • If no interface is shut down, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display this command in the interface view to check whether the local or remote interface is shut down. In the case of a sub-interface, you need to check whether a VLAN ID has been configured on the sub-interface and its peer sub-interface.
   • If either interface is shut down, run the undo shutdown command to enable the interface.
   • If no interface is shut down, go to Step 2.

2. Check the cause of the Down status of the link layer protocol.

   • If the link layer protocol can go Up, the fault is rectified.

   • If the link layer protocol still cannot go Up. go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display this command in the interface view to check whether the interface on each end is shut down.
   • If the interface is shut down, run the undo shutdown command to enable the interface. After that, check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If the interface is not shut down, go to Step 2.

2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface command in the system view to check whether the physical statuses of the local and remote interfaces are Up.
   • If physical statuses of the local and remote interfaces are Down, run the undo shutdown command in the interface view to enable the interface, and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 2.
   • If physical statuses of the local and remote interfaces are Up, go to Step 2.

2. Run the display eth-trunk command in the system view to check whether the number of trunk member interfaces on the local and remote ends is larger than the max active-linkup number.
   • If the number is larger than the max active-linkup number, it indicates a normal situation in the LACP protocol negotiation process, and no action is required.
   • If the number is smaller than the max active-linkup number, go to Step 3.

3. Run the display eth-trunk command in the system view to check whether the number of trunk member interfaces on the local and remote ends is smaller than the least active-linkup number.
   • If the number is smaller than the least active-linkup number, run the least active-linknumber command to re-configure the least active-linup number, making it equal to or less than the number of trunk member interfaces.
   • If the number is greater than the least active-linkup number, go to Step 4.

4. Please Collect alarm information and configuration information, and then contact technical support personnel.

Usually, it was because a user had deleted a logical interface. This alarm message is informational only, and no action is required.

1. Run the display bfd session command in the system view to check BFD session information.

   • If the interface is bound to a BFD session and the BFD session is in the Down state, refer to the BFD troubleshooting guide and rectify the fault.

   • If the interface is bound to a BFD session and the BFD session is in the Up state, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Check the logs to determine the fault cause.
2. The possible causes are as follows:

   • The single channel is faulty.

   • The complect channel is faulty.

   • A loopback operation fails.

3. Check the physical connection.
4. Properly install physical cables, and run the dldp reset command to reset the DLDP status.

   • The single channel is faulty.

   • The complect channel is faulty.

   • A loopback operation fails.

5. Wait three times the DLDP period, and run the display dldp command to check the DLDP status.

   • If the DLDP status is Up, go to Step 7.

   • If the DLDP status is Down, go to Step 6.

6. Please Collect alarm information and configuration information, and then contact technical support personnel.
7. End.

1. Run the display vrrp command in the system view to check VRRP information.

   • If the mVRRP group is Down, refer to the VRRP troubleshooting guide and rectify the fault.

   • If the mVRRP group is Up, go to Step 2.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface [ interface-type [ interface-number ] | slot slot-number ] command to check the status of the link layer protocol on the interface.

   • If the status of the link layer protocol on the interfaces is Up (Bit-error-detection down), BER exceeds the BER alarm threshold, go to Step 2.

   • If the status of the link layer protocol on the interfaces is Down (Bit-error-detection down), go to Step 3.

2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Delete the speed configuration on the port and check whether the alarm is cleared. If the alarm persists, go to Step 2.
2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Replace the current transceiver with a transceiver that the port supports and check whether the alarm is cleared. If the alarm persists, go to Step 2.
2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Delete the negotiation configuration on the port and check whether the alarm is cleared. If the alarm persists, go to Step 2.
2. Check whether the physical link of the interface works improperly. That is, check whether the hardware such as the network cable or optical module is disconnected or loosely connected.
   • If the physical link works improperly, you need to correctly connect the physical link and then check whether the alarm is cleared. If the alarm is not cleared, go to Step 3.
   • If the physical link works properly, go to Step 3.

3. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Run the display interface [ interface-type [ interface-number ] | slot slot-number ] command and check whether the specified interface status is TRIGGER DOWN.

   • If the interface status is TRIGGER DOWN, go to Step 2.

   • If the interface status is not TRIGGER DOWN, go to Step 4.

2. Check the cause following the TRIGGER DOWN field and view the associated service, for example, TRIGGER DOWN (MONITOR GROUP).

   • If a cause is displayed, go to Step 3.

   • If no cause is displayed, go to Step 4.

3. Check and restore the associated service. Check whether the log is cleared. If the log persists, go to Step 4.
4. Please Collect alarm information and configuration information, and then contact technical support personnel.

1. Check the CFM status information.

   • If the CFM status is normal, go to Step 2.

   • If the CFM status is abnormal, see CFM-related troubleshooting.

2. Please Collect alarm information and configuration information, and then contact technical support personnel.