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NE40E V800R010C10SPC500 Configuration Guide - User Access 01

This is NE40E V800R010C10SPC500 Configuration Guide - User Access
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(Optional) Configuring IGMP Packet Duplication

(Optional) Configuring IGMP Packet Duplication

IGMP packet duplication can be configured to allow the master and backup routers to back up information for each other. If a terminal is dual-homed to the master and backup routers, IGMP message duplication can be disabled to reduce resource consumption.


In the multicast two-node hot backup scenario, a DHCP STB connects to the master and backup routers through Smart-link, E-Trunk, or VLL networking. If a fault occurs on the network side, the standby link takes over traffic from the active link. However, the access network does not detect the fault and continues to send IGMP packets to the master router along the faulty link. In this case, IGMP packet duplication needs to be enabled by running the dhcp-stb igmp-copy command, ensuring that the backup router receive the IGMP packets.

If a DHCP STB is dual-homed to the master and backup routers, both routers can receive the IGMP messages. In this case, the undo dhcp-stb igmp-copy command is used to disable IGMP packet duplication, thereby reducing resource consumption.

The IGMP messages sent by a PPPoE terminal can arrive only at a single router. In this case, the master and backup routers have to duplicate IGMP packets and send them to each other. Neither the dhcp-stb igmp-copy nor undo dhcp-stb igmp-copy command needs to be executed.


  1. Run system-view

    The system view is displayed.

  2. Run remote-backup-profile profile-name

    The RBP view is displayed.

  3. Run undo dhcp-stb igmp-copy

    IGMP message duplication is disabled.


    After the undo dhcp-stb igmp-copy command is executed, the system stops backing up the IGMP packets from a DHCP STB, which does not affect the IGMP packets that have been backed up.

  4. Run commit

    The configuration is committed.

Updated: 2019-01-03

Document ID: EDOC1100055031

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