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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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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.

Soft forwarding for IPv6 multicast packets must be disabled on the switch to prevent the low forwarding speed and first packet cache mechanism of soft forwarding from causing disorder of the first packet transmitted at a high speed.


  1. Run system-view

    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.

    In the scenario where Fast Channel Change (FCC) is enabled, it is recommended that you use the multicast ipv6 cpu-forward disable command to disable soft forwarding for IPv6 multicast packets.

  3. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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