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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
When a CE5850 Switch Is Running IGMP Snooping, a User Connected to the Switch Experiences Video Interruption After Playing the Video for a Period of Time

When a CE5850 Switch Is Running IGMP Snooping, a User Connected to the Switch Experiences Video Interruption After Playing the Video for a Period of Time

Keywords

Layer 2 multicast, video interruption, CE5850, switch

Abstract

A PC requests for a video, but the video is interrupted after a period of time. The problem persists after the network cable connected to the PC is removed and reinstalled.

Problem Description

Figure 15-3 shows the network where the problem occurs. The multicast source, non-Huawei switch, CE5850, and PC are located on the same Layer 2 network. IGMP snooping is configured on the non-Huawei switch and CE5850, and the non-Huawei switch acts as the querier. The PC requests for a video.

Figure 15-3 Network diagram

Procedure

  1. Check the Layer 2 multicast forwarding on the CE5850. The command output does not display any outbound interface toward the PC. (10GE1/0/1 is connected to the non-Huawei switch.)
    <HUAWEI> display multicast layer-2 ip fib 
    --------------------------------------------------------------------- 
    Forwarding Mode: IP 
    VLAN  Total                      (Source,Group)  Interface 
    --------------------------------------------------------------------- 
    10     1 
                                    (*, 226.0.1.205)   
    ---------------------------------------------------------------------
  2. Check the router port on the CE5850. The command output shows that the router port is 10GE1/0/1 that is connected to the non-Huawei switch.

    <HUAWEI> display igmp snooping router-port vlan 10 
     Port Name                         UpTime      Expires       Flags 
     -------------------------------------------------------------------- 
     VLAN 10, 1 router-port(s) 
                             00h10m09s    --            DYNAMIC
  3. Packet information obtained on the CE5850 shows that the CE5850 received Query messages of IGMPv3. Therefore, the non-Huawei switch is running IGMP snooping of version 3. (This can also be confirmed on the command line interface of the non-Huawei switch.)

  4. Run the display igmp snooping command on the CE5850. The command output shows that the CE5850 is running IGMP snooping of version 2 (default version of IGMP and IGMP snooping on the CE5850).

    <HUAWEI> display igmp snooping vlan 10 
      IGMP Snooping Information for VLAN 10
         IGMP Snooping is Enabled
         
         IGMP Query Interval is Set to default 60
  5. After the IGMP snooping version on the CE5850 is changed to version 3, the fault is rectified.
Therefore, it can be concluded that the video interruption is caused by inconsistent versions of IGMP snooping on the CE5850 and non-Huawei switch. The problem occurs in the following process:
  • The PC sends an IGMPv2 Report message upstream. Both the CE5850 and non-Huawei switch (running IGMP snooping version 3 and can process messages of version 2) create the matching forwarding entry after receiving the Report message. Multicast traffic is then forwarded to the PC normally.
  • The non-Huawei switch periodically sends IGMPv3 Query messages, and the PC responds with IGMPv3 Report message. The CE5850 cannot process IGMPv3 messages. Therefore, multicast traffic cannot be forwarded to the PC after the outbound interface is aged out on the CE5850.
  • The preceding process repeats after the network cable on the PC is removed and reinstalled.

Root Cause

The non-Huawei switch and CE5850 run IGMP snooping of different versions. The device running a later IGMP snooping version can process IGMP messages of an earlier version, but the device running an earlier version cannot process IGMP messages of a later version.

Solution

Configure the same IGMP snooping version on the Huawei and non-Huawei switches.

Suggestion

When a multicast source and receiver hosts are connected to different switches, it is recommended that you configure Layer 3 multicast on the switch connected to the multicast source. If Layer 2 multicast is configured, you must enable the querier function.

When multicast is enabled on multiple devices, these devices must run the same IGMP or IGMP snooping version.

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Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 612185

Downloads: 2956

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