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Troubleshooting Guide

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

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

Troubleshooting Procedure (CloudEngine 12800E, 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 that the priority mapping configured in the DiffServ domain of the inbound interface is correct.

    Run the display this command in the interface view in the inbound direction and check the configuration of the trust upstream command. If the trust upstream command is not used, the system trusts the DiffServ domain default by default. Then, run the display diffserv domain ds-domain-name command to check whether the priority mapping configured in the DiffServ domain is correct.

    • If not, run the ip-dscp-inbound or 8021p-inbound command to correctly configure priority mapping.
    • If so, go to step 2.

  2. Check whether there are configurations affecting the queues that packets enter on the inbound interface.

    The following configurations affect the queues that packets enter on the inbound interface:

    • If the traffic-policy command that defines remark local-precedence is used, the system sends packets to queues based on the re-marked local priorities.
    • If the trust upstream none command is used, priorities of incoming packets are not mapped and all the packets enter queues based on the default priority of the interface.
    • If the port link-type dot1q-tunnel command is used but the trust 8021p inner command is not used on the interface, all the incoming packets enter queues based on the default priority of the interface.

    Run the display this command in the inbound interface view to check whether there are configurations affecting packet enqueuing on the inbound interface.

    • If so, delete or modify the configuration.
    • If not, go to step b.

  3. Check whether there are configurations affecting the queues that packets enter in the VLAN that packets belong to.

    The following configurations affect the queues that packets enter:

    • If the traffic-policy command that defines remark local-precedence is used, the system sends packets to queues based on the re-marked local priorities.
    • If the traffic-policy command that defines remark 8021p is used, the system maps the re-marked priorities of packets to PHBs and sends the packets to queues based on the PHBs.
    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. Check whether there are configurations affecting the queues that packets enter in the system.

    The following configurations affect the queues that packets enter:

    • If the qos local-precedence-queue-map command is used, the system sends packets to queues based on the mapping between PHBs and queues specified by this command.
    • If the traffic-policy global command that defines remark local-precedence is used, the system sends packets to queues based on the re-marked local priorities.
    • If the traffic-policy global command that defines remark 8021p is used, the system maps the re-marked priorities of packets to PHBs and sends the packets to queues based on the PHBs.
    Run the display current-configuration command to check whether the configurations affecting the packets enqueuing are performed in the system.
    • If so, delete or modify the configuration.
    • If not, go to step 5.

  5. 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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