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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

Troubleshooting Procedure

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 interfaces connected to the user terminals are in Up state.

    Run the display interface interface-type interface-number command in any view to check the status of the interfaces.

  2. Check whether the IP addresses of user terminals are in the same network segment.

    • If they are in different network segments, change the IP addresses of the user terminals.
    • If they are in the same network segment, go to Step 3.

  3. Check that the MAC address entries on the device are correct.

    Run the display mac-address command on the device to check whether the MAC addresses, interfaces, and VLANs in the learned MAC address entries are correct. If the learned MAC address entries are incorrect, run the undo mac-address mac-address vlan vlan-id command on the interface to delete the current entries so that the device can learn MAC address entries again.

    After the MAC address table is updated, check the MAC address entries again.
    • If the MAC address entries are incorrect, go to Step 4.
    • If the MAC address entries are correct, go to Step 5.

  4. Check that the VLAN is properly configured.

    • Check the VLAN configuration according to the following table.

      Check Item

      Method

      Whether the VLAN has been created

      Run the display vlan vlan-id command in any view to check whether the VLAN has been created. If not, run the vlan command to create the VLAN.

      Whether the interfaces are added to the VLAN

      Run the display vlan vlan-id command in any view to check whether the VLAN contains the interfaces. If not, add the interfaces to the VLAN.
      NOTE:

      If the interfaces are located on different devices, add the interfaces connecting the devices to the VLAN.

      • Add an access interface to the VLAN by using either of the following methods:

        NOTE:

        The default type of a device interface is access. To change the interface type to access, run the port link-type access command in the interface view.

        1. Run the port default vlan command in the interface view.
        2. Run the port command in the VLAN view.
      • Add a trunk interface to the VLAN.

        NOTE:

        The default type of a device interface is access. To change the interface type to trunk, run the port link-type trunk command in the interface view.

        Run the port trunk allow-pass vlan command in the interface view.

      • Add a hybrid interface to the VLAN by using either of the following methods:

        NOTE:

        The default type of a device interface is access. To change the interface type to hybrid, run the port link-type hybrid command in the interface view.

        1. Run the port hybrid tagged vlan command in the interface view to add the hybrid interface to the VLAN in tagged mode.
        2. Run the port hybrid untagged vlan command in the interface view to add the hybrid interface to the VLAN in untagged mode.

      Whether connections between interfaces and user terminals are correct

      Check the connections between interfaces and user terminals according to the network plan. If any user terminal is connected to an incorrect interface, connect it to the correct interface.

      After the preceding operations:
      • If the MAC address entries are correct, go to Step 5.
      • If the MAC address entries are incorrect, go to Step 7.

  5. Check whether Layer 2 port isolation is configured.

    Run the interface interface-type interface-number command in the system view to enter the interface view, and then run the display this command to check whether Layer 2 port isolation is configured on the interface.
    • If Layer 2 port isolation is not configured, go to Step 6.
    • If Layer 2 port isolation is configured, run the undo port-isolate enable command on the interface to disable Layer 2 port isolation. If the fault persists, go to Step 6.

  6. Check whether correct static Address Resolution Protocol (ARP) entries are configured on the user terminals.

    • If the static ARP entries are incorrect, modify them.
    • If the static ARP entries are correct, go to Step 7.

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

    • Results of the preceding troubleshooting procedure

    • Configuration file, log file, and alarm file of the device

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Updated: 2020-01-07

Document ID: EDOC1000060766

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