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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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The PIM Neighbor Relationship Remains Down

The PIM Neighbor Relationship Remains Down

Common Causes

This fault is commonly caused by one of the following causes:

  • The interface is physically Down or the link-layer protocol status of the interface is Down.

  • PIM is not enabled on the interface.

  • PIM configurations on the interface are incorrect.

Troubleshooting Flowchart

After PIM network configuration is complete, the PIM neighbor relationship remains Down.

Figure 20-3 shows the troubleshooting flowchart.

Figure 20-3  Troubleshooting flowchart: the PIM neighbor relationship remains Down

Troubleshooting Procedure

Context

NOTE:

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

Procedure

  1. Check that PIM is enabled on the interface.

    Run the display current-configuration interface interface-type interface-number command to check whether PIM is enabled on the interface.

    • If PIM is not enabled, enable PIM on the interface.

      If "Error: Please enable multicast in the system view first." is prompted when you enable PIM, first run the multicast routing-enable command in the system view to enable the multicast function. Then, go on to enable PIM-SM or PIM-DM on the interface.

    • If PIM has been enabled on the interface, go to Step 2.

  2. Check that the PIM status of the interface is Up.

    Run the display pim interface interface-type interface-number command to check whether the PIM status of the interface is Up.

    • If the PIM status is Down, run the display interface interface-type interface-number command to check whether the physical status and link status of the interface are both Up.

      1. If the physical status is not Up, make the physical status go Up.

      2. If the link status is not Up, make the link status go Up.

    • If the PIM status of the interface is Up, go to Step 3.

  3. Check that PIM configurations on the interface are correct.

    This fault may be caused by the following PIM configurations:
    • The IP addresses of directly-connected interfaces are on different network segments.

    • PIM silent is configured on the interface.

    • A PIM neighbor filtering policy is configured on the interface and the address of the PIM neighbor is filtered out by the policy.

    • If the interface is configured to deny Hello messages without Generation IDs, the interface discards all the Hello messages received from PIM neighbors without any Generation IDs. As a result, the PIM neighbor relationship cannot go Up. This case applies to the scenario in which Huawei devices are intercommunicating with non-Huawei devices.

    Run the display current-configuration interface interface-type interface-number command to check whether any of the preceding PIM configurations exist on the interface.

    • If any of the preceding PIM configurations exist, correct it.

    • If the fault persists after the preceding operations are complete, go to Step 4.

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

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

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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 445465

Downloads: 4299

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