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Troubleshooting Guide

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

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Troubleshooting Procedure

Troubleshooting Procedure


After commands are configured to troubleshoot faults, pay attention to the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to the two-phase validation mode.

  • In immediate validation mode, the configuration takes effect immediately after you run a command and press Enter.
  • In two-phase validation mode, you must run the commit command after commands are configured to commit the configuration.

Save the results of each troubleshooting step, so you can provide related information to Huawei technical support if your troubleshooting fails.


  1. Check whether the STP status of the Eth-Trunk is blocking.

    The interface must work properly so that it can forward traffic. Run the display stp brief command in any view to check the STP State field of the Eth-Trunk to determine whether the Eth-Trunk is in blocking state.

    <HUAWEI> display stp brief
     MSTID  Port                        Role       Protection  Cost       Edged
         0  10GE1/0/1                   ROOT  forwarding    none        2000       disable
         0  Eth-Trunk10                 ALTE  discarding    none        2000       disable
         0  10GE1/0/3                   DESI  forwarding    none        2000       disable

    • If the value of the STP State field is discarding, the Eth-Trunk is in blocking state and cannot forward traffic. Check whether there are loops on the network.

    • If the Eth-Trunk is not in blocking state, go to Step 2.

  2. Check whether the physical status of the Eth-Trunk member interfaces is Up.

    Only the member interface in Up state can be selected as the active interface. Run the display interface interface-type interface-number command in any view to check the physical status of the Eth-Trunk member interface. The current state field refers to the physical status of the interface.

    <HUAWEI> display interface 10ge 1/0/1
    10GE1/0/1  : UP (ifindex: 4)
    Line protocol current state : UP

    • If the value of the current state field is UP, the interface works properly. Go to Step 3.

    • If the value of the current state field is not UP, check the physical link and optical module of the Eth-Trunk member interface.

  3. Check whether the configuration of the Eth-Trunk is correct.

    Run the display eth-trunk trunk-id command in any view to check whether the Eth-Trunk at both ends uses the manual mode and whether the lower threshold for the number of active interfaces is proper. Working Mode indicates the working mode of the Eth-Trunk, and Least Active-linknumber indicates the lower threshold for the number of active interfaces.
    <HUAWEI> display eth-trunk 10
    Eth-Trunk10's state information is:
    : Normal        Hash Arithmetic: profile default
    : 2  Max Bandwidth-affected-linknumber: 16
    Operating Status: up        Number of Up Ports in Trunk: 1

    • If the Eth-Trunk at one end does not use the manual mode, configure the Eth-Trunk to work in manual mode. If the number of Eth-Trunk member interfaces in Up state is less than the lower threshold for the number of active interfaces, run the least active-linknumber command in the Eth-Trunk interface view to change the lower threshold.

    • If the configuration of the Eth-Trunk is correct, go to Step 4.

  4. Collect the following information and contact technical support personnel.

    • Results of the preceding troubleshooting procedure

    • Configuration file, logs, and alarms of the device

Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 607134

Downloads: 2948

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