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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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Multicast Traffic Is Interrupted

Multicast Traffic Is Interrupted

Common Causes

This fault is commonly caused by one of the following:

  • Route configurations are incorrect.
  • Interface status is incorrect.
  • PIM routing entries are not created.
  • Multicast forwarding entries are not created.

Troubleshooting Flowchart

After the Layer 3 multicast is configured, multicast traffic cannot be transmitted to users.

The troubleshooting roadmap is as follows:
  • Check that a route destined for the multicast source is available.
  • Check that the VLANs on the inbound and outbound interfaces of the multicast route function properly.
  • Check that the PIM routing entries are created.
  • Check that the multicast forwarding entries are created.
Figure 20-2  Troubleshooting flowchart

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 that a route destined for the multicast source is available.

    Run the display ip routing-table ip-address command to check whether the local routing table contains a route destined for the multicast source.

    NOTE:

    ip-address specifies the multicast source address.

    • If not, configure a route destined for the multicast source.

    • If yes, go to step 2.

  2. Check that the inbound and outbound interfaces of the multicast forwarding entry function properly.

    Run the display interface command to view interface status.

    • If the interfaces are abnormal, the multicast forwarding entry cannot be created. Rectify the fault.

      In the following information, the status of GigabitEthernet 2/0/0 is Up.

      <Huawei>display interface gigabitethernet 2/0/0                                             
      GigabitEthernet2/0/0 current state : UP
      Line protocol current state : UP
      Description:HUAWEI, AR Series, GigabitEthernet2/0/0 Interface
      Switch Port,PVID :  200,The Maximum Frame Length is 1628
      IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 00e0-fc01-0005
      Last physical up time   : 2008-01-31 19:19:06
      Last physical down time : 2008-01-31 19:12:01
      Current system time: 2008-02-04 16:18:20
      Port Mode: COMMON COPPER
      Speed :  100,  Loopback: NONE
      Duplex: FULL,  Negotiation: ENABLE
      Mdi   : AUTO
      Last 300 seconds input rate 128 bits/sec, 0 packets/sec
      Last 300 seconds output rate 648 bits/sec, 0 packets/sec
      Input peak rate 736 bits/sec,Record time: 2008-01-31 19:05:00
      Output peak rate 1624 bits/sec,Record time: 2008-01-31 19:19:26
      
      Input:  11177 packets, 4996374 bytes
        Unicast:                  0,  Multicast:               11177
        Broadcast:                0,  Jumbo:                       0
        Discard:                  0,  Total Error:                 0
      
        CRC:                      0,  Giants:                      0
        Jabbers:                  0,  Throttles:                   0
        Runts:                    0,  DropEvents:                  0
        Alignments:               0,  Symbols:                     0
        Ignoreds:                 0,  Frames:                      0
      
      Output:  194443 packets, 26925040 bytes
        Unicast:                  0,  Multicast:              183273
        Broadcast:            11170,  Jumbo:                       0
        Discard:                  0,  Total Error:                 0
      
        Collisions:               0,  ExcessiveCollisions:         0
        Late Collisions:          0,  Deferreds:                   0
        Buffers Purged:           0
      
          Input bandwidth utilization threshold : 100.00%
          Output bandwidth utilization threshold: 100.00%
          Input bandwidth utilization  : 0.01%
          Output bandwidth utilization : 0.01% 
    • If the interface status is normal, go to step 3.

  3. Check that the PIM routing entries are created.

    Run the display pim routing-table command to check whether PIM routing entries are created.

    • If not, contact technical support personnel.

    • If yes, go to step 4.

  4. Check whether the multicast forwarding entries are created.

    Run the display multicast forwarding-table command to check that the multicast forwarding entries are created.

    • If the fault persists, record the command output and contact technical support personnel.

  5. Collect the following information and contact technical support personnel.
    • Results of the preceding troubleshooting procedure

    • Configuration files, log files, and alarm files of the devices

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Updated: 2019-05-10

Document ID: EDOC1000079719

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