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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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Monitoring Device Does Not Receive Any Mirrored Packet After Port Mirroring Is Configured

Monitoring Device Does Not Receive Any Mirrored Packet After Port Mirroring Is Configured

This section describes the troubleshooting flowchart and provides a step-by-step troubleshooting procedure for the failure to mirror packets to the monitoring device by port mirroring.

Common Causes

This fault is commonly caused by one of the following:

  • The mirrored port does not receive any packets.
  • The mirrored port or observing port is configured incorrectly, for example, the interface index is incorrect.

Troubleshooting Flowchart

After port mirroring is configured on the AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600, the monitoring device does not receive any mirrored packets.

Figure 14-1 shows the troubleshooting flowchart.

Figure 14-1  Troubleshooting flowchart for the port mirroring fault

Troubleshooting Procedure

NOTE:

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

Procedure

  1. Check whether the mirrored port receives packets.

    Run the display interface command multiple times to view information about the mirrored port. The Input field in the command output specifies the number of received packets. The Output field in the command output specifies the number of sent packets.

    • If the number of sent and received packets is 0 or remains unchanged, check the status of the interface connected to the monitored network.

      • If the interface status is Down, bring the interface Up.
      • If the interface status is Up, no traffic is sent to the switch from the monitored network. No action is necessary.
    • If the number of packets received by the mirrored port is not 0 and keeps increasing, go to step 2.

  2. Check that the mirrored port is configured correctly.

    When configuring the mirrored port, ensure that the observing port index specified in the command is the same as the index of the configured observing port. Run the display mirror-port command to check the mapping between the observing port and mirrored port and the direction of packets to which port mirroring is applied.

    • If the mirrored port configuration is incorrect, run the mirror (interface view) command in the view of the mirrored port to specify the observing port index correctly.

    • If the mirrored port configuration is correct, go to step 3.

  3. Check whether the observing port sends packets to the monitoring device.

    Run the display interface command multiple times to view information about the observing port. The Output field in the command output specifies the number of packets sent by the observing port.

    • If the number of sent packets is 0 or remains unchanged, check the status of the observing port.

      • If the observing port is Down, bring it to Up.

      • If the observing port is Up, go to step 4.

    • If the number of packets sent by the observing port is not 0 and keeps increasing, go to step 4.

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

    • Results of the preceding troubleshooting procedure
    • Configuration file, log file, and alarm file of the AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600

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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 445497

Downloads: 4299

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