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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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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).
Common Configuration Errors

Common Configuration Errors

This section describes common configuration errors of BFD.

BFD Session Cannot Become Up

Common Causes

This fault is commonly caused by one of the following:

  • The link carrying the BFD session is faulty. As a result, BFD packets cannot be exchanged.

  • The BFD session flaps frequently.

Procedure

  1. Run the display current-configuration configuration bfd-session command to check whether the local and remote discriminators at both ends match.

    • If the local and remote discriminators at both ends match, go to step 2.

    • If the local and remote discriminators at both ends do not match, run the discriminator command to correctly configure local and remote discriminators, and then run the display bfd session all command to check whether the BFD session is Up.
      • If the value of the State field is Up, the BFD session has been established.

      • If the value of the State field is not Up, go to step 2.

  2. Run the display current-configuration configuration bfd-session command to check whether the BFD detection time is longer than the delay before the BFD session becomes Up.

    Detection time = Received Detect Multi of the remote system x Max (Local RMRI/Received DMTI) Detect Multi is the local detection multiplier, which is set by using the detect-multiplier command. The Required Min Rx Interval (RMRI) is the minimum interval for receiving BFD packets, which is set by using the min-rx-interval command. The Desired Min Tx Interval (DMTI) is the minimum interval for sending BFD packets, which is set by using the min-tx-interval command.

    The link delay can be obtained using the ping or tracert mechanism.

    If the BFD detection time is shorter than the delay before the BFD session becomes Up, run the detect-multiplier, min-rx-interval, and min-tx-interval commands to increase the BFD detection time to be longer than the delay.

BFD Detection Result Affects Forwarding on an Interface

Common Causes

The BFD session is associated with the interface status.

Procedure

  1. Run the display interface interface-type interface-number command to check the physical status of the interface bound to the BFD session.

    • If the value of Line protocol current state is UP (BFD status down), the interface status is affected by the BFD session status. When the BFD session detects a link fault, the interface enters the BFD status down state. Go to step 2.

    • If the value of Line protocol current state is UP but the interface cannot forward packets, the forwarding module is working properly.

  2. Run the display bfd session all command to check the BFD session status.

    If the BFD session status is Down, go to step 3.

  3. Run the display current-configuration configuration bfd-session command to check the BFD session configuration and check whether the process-interface-status [ sub-if ] [ reboot-no-impact ] command is used.

    If the process-interface-status [ sub-if ] [ reboot-no-impact ] command is used, the interface enters the DOWN (BFD status down) state when the BFD session detects a link fault and enters the Down state. As a result, the interface cannot forward packets.

Modified BFD Parameters Do Not Take Effect

Common Causes

After BFD session parameters are modified, the configuration is not committed.

NOTE:

Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.

Procedure

  1. Run the display current-configuration configuration bfd-session command to check the BFD session configuration and check whether the commit command is used.

    • If the commit command is used, the modified BFD parameters are committed.

    • If the commit command is not used, the modified BFD parameters are not committed. Run the commit command to commit the configuration.

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Updated: 2019-01-11

Document ID: EDOC1000176006

Views: 115600

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