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Troubleshooting Guide

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

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Troubleshooting Procedure (CE12800 series, CE6875EI, and CE6870EI)

Troubleshooting Procedure (CE12800 series, CE6875EI, and CE6870EI)

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 packets enter correct queues on the outbound interface.

    Run the display qos queue statistics interface interface-type interface-number command to view queue statistics on the outbound interface.

  2. Check whether there are configurations affecting priority mapping in the system.

    If the qos phb marking dscp enable command is not used to map PHBs or colors to DSCP priorities globally, the system does not map PHBs to DSCP priorities for outgoing packets. If the qos phb marking 8021p disable command is used to disable mapping from PHBs or colors to 802.1p priorities globally, the system does not map PHBs to 802.1p priorities for outgoing packets.

    Run the display this command in the system view to check whether there are configurations affecting priority mapping.
    • If so, delete or modify the configuration.
    • If not, go to step 3.

  3. Check whether there are configurations affecting priority mapping in the VLAN that packets belong to.

    If the traffic-policy command that defines remark 8021p or remark dscp is used, the system maps the re-marked priorities of packets to the local priorities and sends the packets to queues based on the mapped local priorities.

    Run the display this command in the view of the VLAN that packets belong to and check whether the configurations affecting packet enqueuing are performed in the VLAN.
    • If so, delete or modify the configuration.
    • If not, 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

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Updated: 2020-01-07

Document ID: EDOC1000060766

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