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Troubleshooting Guide
CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches
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Troubleshooting Procedure (CloudEngine 8800, 7800, 6800, and 5800 Series Switches Excluding the CE6870EI and CE6875EI)

Troubleshooting Procedure (CloudEngine 8800, 7800, 6800, and 5800 Series Switches Excluding the CE6870EI and CE6875EI)

Context

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.

Procedure

  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+WRR or PQ+DRR is recommended. The delay-sensitive core services are scheduled in PQ mode and other services are scheduled in WRR or DRR 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 WRR or DRR 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 | wrr | drr } command to reconfigure the queue scheduling mode.

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

  2. Check whether the weight ratio in WRR or DRR queues is overlarge (CE5800 series switches (excluding the CE5880EI)).

    Run the display this command in the interface view to check whether the weight ratio is greater than 62:1 in WRR or DRR scheduling.
    • If the weight ratio is greater than 62:1, run the qos queue queue-index drr weight weight or qos queue queue-index wrr weight weight command to change the queue weights. Ensure that the weight ratio between any two queues is smaller than 62:1.
    • If the weight ratio is not greater than 62:1, go to step 3.

  3. 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.

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

    • Results of the preceding troubleshooting procedure
    • Configuration file, logs, and alarms of the device

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Updated: 2020-01-07

Document ID: EDOC1000060766

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