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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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A Tunnel Interface Is Unstable

A Tunnel Interface Is Unstable

Common Causes

This fault is commonly caused by one of the following:
  • The tunnel interface flaps between Up and Down states: The outbound interface toward the tunnel destination IP address is also a tunnel interface.

  • The tunnel interface speed is low: The outbound interface toward the tunnel destination IP address is a VLANIF interface.

Troubleshooting Flowchart

After a GRE tunnel is set up, the tunnel interface goes Up, and the local and remote ends can ping each other. However, the tunnel interface flaps or transmits data at a low speed. In this case, rectify the fault according to Figure 25-3.

Figure 25-3 GRE tunnel interface troubleshooting flowchart

Troubleshooting Procedure

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 technical support personnel.

Procedure

  • The tunnel interface flaps.
    1. Check the route to the tunnel destination IP address of the tunnel. Ensure that the outbound interface of the route is not a GRE tunnel interface.

      Run the display ip routing-table command in any view to check whether the outbound interface toward the tunnel destination IP address is a GRE tunnel interface.

      • If so, change the network topology to ensure that the outbound interface is not a GRE tunnel interface.
      • If not, go to step 2.

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

      • Results of the preceding troubleshooting procedure
      • Configuration file, logs, and alarms of the device

  • The data transmission speed on the tunnel interface is low.
    1. Check the route to the tunnel destination IP address. Ensure that the outbound interface of the route is not a VLANIF interface.

      Run the display ip routing-table command in any view to check whether the outbound interface toward the tunnel destination IP address is a VLANIF interface.

      • If so, change the network topology to ensure that the outbound interface is not a VLANIF interface.
      • If not, go to step 2.

    2. 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: 2019-08-09

Document ID: EDOC1000079719

Views: 492472

Downloads: 4523

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