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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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Disabling Software Forwarding for IPv6 Multicast Packets

Disabling Software Forwarding for IPv6 Multicast Packets

Pre-configuration Tasks

Before disabling soft forwarding for IPv6 multicast packets, complete the following tasks:

  • Configure an IPv6 unicast routing protocol to ensure normal unicast routing on the IPv6 network.
  • Run the multicast ipv6 routing-enable command in the system view to enable Layer 3 IPv6 multicast routing globally.


In most cases, the switch performs software forwarding before the hardware forwarding entries are generated. After hardware forwarding entries are generated, the switch performs hardware forwarding. Software forwarding for IPv6 multicast packets must be disabled on the switch to prevent packet loss and mis-sequencing caused by the low forwarding speed and first packet cache mechanism of software forwarding.


  1. Run:


    The system view is displayed.

  2. Run:

    multicast ipv6 cpu-forward disable

    Software forwarding is disabled for IPv6 multicast packets.

    By default, software forwarding for IPv6 multicast packets is enabled.

Updated: 2019-08-21

Document ID: EDOC1000141903

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