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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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Layer 2 Traffic Forwarding in a Bridge Group Fails

Layer 2 Traffic Forwarding in a Bridge Group Fails

This section describes the troubleshooting flowchart and provides a step-by-step troubleshooting procedure for a Layer 2 traffic forwarding failure within a bridge group.

Common Causes

Figure 16-5  Networking diagram for local bridging

As shown in Figure 16-5, Users 1, 2, 3, 4, and 5 belong to the same network segment but different VLANs. Local bridging is configured to allow users in VLAN 11 to communicate with User 3 but to be isolated from users in VLAN 12. That is, users that need to communicate with each other are added to the same bridge group, whereas users that do not need to communicate with each other are added to different bridge groups. The problem is that users in different bridge groups can be isolated from each other, but those in the same bridge group cannot communicate with each other. This fault is commonly caused by one of the following:
  • Physical interfaces fail to be added to bridge groups.
  • Member interfaces in bridge groups become faulty.

Troubleshooting Flowchart

Figure 16-6 shows the troubleshooting flowchart.

Figure 16-6  Troubleshooting flowchart for a Layer 2 traffic forwarding failure within a bridge group

Troubleshooting Procedure

Context

NOTE:

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.

Procedure

  1. Check that every bridge group has member interfaces.

    Use Router A as an example. Run the display bridge information command on Router A to check whether the bridge group has member interfaces.

    <RouterA> display bridge information
    Bridge 1 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : -
        MAC learning : Enable
      interface :total 2 interface(s) in the bridge
        GigabitEthernet0/0/0 : Up
        Vlanif11 : Up
    Bridge 2 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : -
        MAC learning : Enable
      interface :total 1 interface(s) in the bridge
        Vlanif12 : Up

    • If the bridge group does not have any member interfaces, add physical interfaces to the bridge group.

      For details on how to add physical interface to a bridge group, see "Transparent Bridge Configuration" in the AR100&AR120&AR150&AR160&AR200&AR1200&AR2200&AR3200&AR3600 Configuration Guide - LAN.

    • If the bridge group has member interfaces, go to Step 2.

  2. Check that member interfaces in each bridge group are Up.

    Use Router A as an example. Run the display bridge information command on Router A to check the member interface status in the bridge group on Router A.

    <RouterA> display bridge information
    Bridge 1 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : -
        MAC learning : Enable
      interface :total 2 interface(s) in the bridge
        GigabitEthernet0/0/0 : Up
        Vlanif11 : Up
    Bridge 2 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : -
        MAC learning : Enable
      interface :total 1 interface(s) in the bridge
        Vlanif12 : Up

    • If any member interface is Down, troubleshoot the member interfaces in the bridge group. For example, check whether the interface is up and the protocol configuration is correct.

    • If all member interfaces are Up, go to Step 3.

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

    • Results of the preceding troubleshooting procedure

    • Configuration, log, and alarm files

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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 450218

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