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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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User Hosts in the User VLAN Fail to Receive Multicast Data

User Hosts in the User VLAN Fail to Receive Multicast Data

Fault Description

After VLAN-based multicast VLAN replication is configured, user hosts in the user VLAN cannot receive multicast data.

Procedure

  • Check whether multicast VLAN replication is correctly configured.

    Run the display multicast-vlan vlan vlan-id command to check whether the user VLAN is bound to a correct multicast VLAN.

    • If the user VLAN is not bound to a correct multicast VLAN, run the multicast-vlan user-vlan command to bind VLANs correctly.
    • If the user VLAN is bound to a correct multicast VLAN, check whether other Layer 2 multicast configurations conflict.
      The following information shows that user VLANs 100 and 200 are bound to multicast VLAN 10 correctly.
      [HUAWEI] display multicast-vlan vlan 10
       Multicast-vlan         : 10
       User-vlan Number       : 2
       IGMP snooping state    : Enable
       MLD  snooping state    : Disable
       Prune-source-port state: Disable 
       User-vlan              Snooping-state
       -----------------------------------------------
       100                     IGMP Enable /MLD Disable
       200                     IGMP Enable /MLD Disable

  • Check whether Layer 3 multicast forwarding is normal.

    Run the ping multicast host command to check whether Layer 3 multicast forwarding is normal. If Layer 3 multicast forwarding is abnormal, run the capture-packet { interface interface-type interface-number | acl acl-number } * command to obtain packet header information from the incoming multicast data flow on the inbound interface. Check the TTL value in the packet header.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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