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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 Packets After Traffic Mirroring Is Configured

Monitoring Device Does Not Receive Any Mirrored Packets After Traffic Mirroring Is Configured

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

Common Causes

This fault is commonly caused by one of the following:

  • The link between the mirrored port and the monitored network is Down.
  • No traffic policy is applied or no packets match the traffic policy.
  • The observing port index specified in the traffic behavior is different from the index of the configured observing port.

Troubleshooting Flowchart

After traffic mirroring is configured on the AR, the monitoring device does not receive any mirrored packets.

Figure 14-2 shows the troubleshooting flowchart.

Figure 14-2 Troubleshooting flowchart for the traffic mirroring fault

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 Huawei technical support personnel.

Procedure

  1. Check whether the mirrored port receives packets.

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

    • If the number of packets received by the mirrored port is 0 or keeps unchanged, the link between the router and the monitored network is faulty, for example, the mirrored port is Down. Rectify the link fault.

    • If the number of packets received by the mirrored port is not 0 and keeps increasing, go to step 2.

  2. Check whether the traffic policy is correctly applied.

    1. Check whether the traffic policy is applied.

      A traffic policy can be applied to an interface, a VLAN, or the system. Run the display traffic-policy policy-name applied-record command to check whether the traffic policy is applied.

      • If the traffic policy is not applied, apply it in the interface view, VLAN view, or system view based on the network requirements.

      • If the traffic policy is applied, check the traffic policy configuration.

    2. Check whether the traffic policy is configured correctly. Verify the traffic policy configuration by checking the traffic statistics.

      Run the statistic enable command in the traffic behavior view to enable the traffic statistics function. Run the display traffic policy statistics command to check the statistics about packets matching the traffic policy.

      • If the number of packets matching the traffic policy is 0, rectify the fault of the traffic policy first. Rectify the traffic policy fault according to Troubleshooting Procedure.

      • If the number of packets matching the traffic policy is not 0, go to step 3.

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

    Run the display interface 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 packets sent by the observing port is 0 or keeps unchanged, follow these steps:

      1. Run the display interface command to check the status of the observing port. If the observing port is in Down state, rectify the link fault. If the observing port is in Up state. Go to step b.

      2. If the observing port is in Up state, check whether the observing port index specified in the traffic behavior is the same as the index of the configured observing port. If not, run the mirror (traffic behavior view) command to specify the correct observing port index. Otherwise, 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 router

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Updated: 2019-08-09

Document ID: EDOC1000079719

Views: 490415

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