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Troubleshooting Guide

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

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Troubleshooting Procedure (CloudEngine 12800, and 12800E Series, CE6875EI, and CE6870EI)

Troubleshooting Procedure (CloudEngine 12800, and 12800E Series, CE6875EI, and CE6870EI)


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 queue scheduling mode is configured correctly.

    Run the display this command in the interface view to check whether the queue scheduling mode is correct.

    When you configure the queue scheduling mode, pay attention to the following points:

    • The combined scheduling mode of PQ+WFQ is recommended. The delay-sensitive core services are scheduled in PQ mode and other services are scheduled in WFQ mode.
    • If each queue is configured with PQ scheduling, delay-sensitive core services are put in high-priority queues and non-core services are put in low-priority queues.
    • If each queue is configured with WFQ scheduling, key services are assigned higher weights and non-key services are assigned lower weights.
    • If the average length of different types of packets varies slightly, WRR scheduling is used; if such an average length differs a lot, DRR scheduling is used.
    • If the queue scheduling mode is incorrect, run the qos { pq | wfq } command to reconfigure the queue scheduling mode.

    • If the queue scheduling mode is correct, go to step 2.

  2. Check whether packets enter correct queues.

    Use the tester to send different types of packets to the device and run the display qos queue statistics command to view statistics on queues. Check whether packets enter queues corresponding to the scheduling mode in step 1.

  3. 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: 613339

Downloads: 2962

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