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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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Traffic Forwarding in IP Routing of Bridge Groups Fails

Traffic Forwarding in IP Routing of Bridge Groups Fails

This section describes the troubleshooting flowchart and provides a step-by-step troubleshooting procedure for a traffic forwarding failure in a network configured with IP routing of bridge groups.

Common Causes

Figure 16-7 Networking diagram for IP routing of bridge groups
As shown in Figure 16-7, Enterprise A and Enterprise C are on different network segments. To allow the two enterprises to communicate with each other, IP routing has been configured for bridge groups. The enterprises, however, 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.
  • Routes between the two enterprises are unreachable.

Troubleshooting Flowchart

Figure 16-8 shows the troubleshooting flowchart.

Figure 16-8 Troubleshooting flowchart for a traffic forwarding failure in a network configured with IP routing of bridge groups

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 on Router A has member interfaces.

    <RouterA> display bridge information
    Bridge 1 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : IP
        MAC learning : Enable
      interface :total 2 interface(s) in the bridge
        Ethernet1/0/0 : Up
        Ethernet2/0/0 : Up
    Bridge 2 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : IP
        MAC learning : Enable
      interface :total 1 interface(s) in the bridge
        Ethernet2/0/1 : Up

    • If the bridge group does not have any member interfaces, add physical interfaces to the bridge group as shown in Figure 16-7.

      For details on how to add physical interface to a bridge group, see "Transparent Bridge Configuration" in the AR Configuration Guide - LAN.

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

  2. Check that every Bridge-if interface is Up.

    Use Router A as an example. Run the display interface bridge-if command on Router A to check the Bridge-if interface status.

    <RouterA> display interface bridge-if
    Bridge-if1 current state : UP
    Line protocol current state : UP
    Last line protocol up time : 2011-01-07 15:13:49 UTC-08:00
    Description:HUAWEI, AR Series, Bridge-if1 Interface
    Route Port,The Maximum Transmit Unit is 1500
    Internet Address is 1.1.1.3/24
    IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-057a-a000
    Physical is BRIDGE-IF
    Current system time: 2011-01-07 15:27:12-08:00
        Last 300 seconds input rate 0 bits/sec, 0 packets/sec
        Last 300 seconds output rate 0 bits/sec, 0 packets/sec
        Realtime 24 seconds input rate 0 bits/sec, 0 packets/sec
        Realtime 24 seconds output rate 0 bits/sec, 0 packets/sec
        Input: 11 packets,0 bytes,
               10 unicast,1 broadcast,0 multicast
               0 errors,0 drops,0 unknownprotocol
        Output:13 packets,0 bytes,
               11 unicast,2 broadcast,0 multicast
               0 errors,0 drops
        Input bandwidth utilization  : 0.00%
        Output bandwidth utilization : 0.00%
    Bridge-if2 current state : UP
    Line protocol current state : UP
    Last line protocol up time : 2011-01-07 15:25:34 UTC-08:00
    Description:HUAWEI, AR Series, Bridge-if2 Interface
    Route Port,The Maximum Transmit Unit is 1500
    Internet Address is 2.2.2.3/24
    IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-057a-a000
    Physical is BRIDGE-IF
    Current system time: 2011-01-07 15:27:12-08:00
        Last 300 seconds input rate 0 bits/sec, 0 packets/sec
        Last 300 seconds output rate 0 bits/sec, 0 packets/sec
        Realtime 0 seconds input rate 0 bits/sec, 0 packets/sec
        Realtime 0 seconds output rate 0 bits/sec, 0 packets/sec
        Input: 139 packets,0 bytes,
               0 unicast,0 broadcast,0 multicast
               0 errors,0 drops,0 unknownprotocol
        Output:140 packets,0 bytes,
               0 unicast,0 broadcast,0 multicast
               0 errors,0 drops
        Input bandwidth utilization  : 0.00%
        Output bandwidth utilization : 0.00%

    • If the Bridge-if 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 the Bridge-if interface is Up, go to Step 3.

  3. Check that the routes between different bridge groups are reachable.

    Run the Ping command on Router A to check whether different bridge groups can ping each other successfully.

    • If the ping fails, go to Step 4.

    • If the ping succeeds, go to Step 5.

  4. Check that IP routing is enabled for the bridge group.

    Run the display bridge information command on Router A to check information about the configured bridge group.

    <RouterA> display bridge information
    Bridge 1 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : IP
        MAC learning : Enable
      interface :total 2 interface(s) in the bridge
        Ethernet1/0/0 : Up
        Ethernet2/0/0 : Up
    Bridge 2 :
        Status       : Undo Shutdown
        Bridging     : IP, Others
        Routing      : IP
        MAC learning : Enable
      interface :total 1 interface(s) in the bridge
        Ethernet2/0/1 : Up

    • If IP routing is not enabled for the bridge group, run the routing ip command in the bridge group view to enable IP routing.

    • If IP routing has been enabled for the bridge group, check whether the IP address is correctly configured for the Bridge-if interface. For details, see the chapter "The Ping Operation Fails" in the AR Troubleshooting - IP Forwarding and Routing.

    If different bridge groups still cannot ping each other successfully after the preceding steps are complete, go to Step 5.

  5. Check that the network-side interfaces on Router A and Router B are added to the same bridge group.

    Run the display this command on Router A and Router B to check the configuration on network-side interfaces.

    # Check the network-side interface configuration on Router A.

    <RouterA> system-view
    [RouterA] interface ethernet2/0/1
    [RouterA-Ethernet2/0/1] display this
    #
    interface Ethernet2/0/1
     bridge 2
     undo shutdown
    #
    return

    # Check the network-side interface configuration on Router B.

    <RouterB> system-view
    [RouterB] interface ethernet2/0/1
    [RouterB-Ethernet2/0/1] display this
    #
    interface Ethernet2/0/1
     bridge 2
     undo shutdown
    #
    return

    • If the network-side interfaces on Router A and Router B are added to the same bridge group, go to Step 6.

    • If the network-side interfaces on Router A and Router B are not added to the same bridge group, see "Transparent Bridge Configuration" in the AR Configuration Guide - LAN to add the network-side interfaces to the same bridge group.

  6. 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: 2019-08-09

Document ID: EDOC1000079719

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