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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Interface Forwarding Is Interrupted After a BFD Session Detects a Fault and Goes Down

Interface Forwarding Is Interrupted After a BFD Session Detects a Fault and Goes Down

Common Causes

This fault is commonly caused by the following:
  • The BFD session status is associated with the interface status.

Troubleshooting Flowchart

Figure 23-4  Troubleshooting flowchart for the fault that the interface forwarding is interrupted after a BFD session detects a fault and goes Down

Troubleshooting Procedure



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


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

    • If the Line protocol current state field displays DOWN(BFD status down), the interface status is set to BFD status down after the BFD session detects a link fault. Then, go to Step 2.

    • If the Line protocol current state field displays UP but the interface cannot forward packets, the forwarding module is faulty. See the section The Ping Operation Fails to rectify the forwarding fault.

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

    • If the BFD session is Down, go to Step 3.

    • If the BFD session is Up, go to Step 4.

  3. Run the display current-configuration configuration bfd-session command to check that the process-interface-status command is configured.

    • If the process-interface-status command is configured, the interface is set to DOWN(BFD status down) because the BFD session detected a fault and went Down.

    • If the process-interface-status command is not configured, go to Step 4.

  4. If the fault persists, collect the following information and contact technical support personnel.

    • Results of the preceding troubleshooting procedure.
    • Configuration files, log files, and alarm files of the devices.

Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 444015

Downloads: 4295

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