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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 Multicast Packets

Disabling Software Forwarding for Multicast Packets

Pre-configuration Tasks

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

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

Context

In most cases, a switch performs software forwarding before hardware forwarding entries are generated. After hardware forwarding entries are generated, the switch performs hardware forwarding. Software forwarding for 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.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    multicast cpu-forward disable

    Soft forwarding is disabled for multicast packets.

    By default, software forwarding for multicast packets is enabled.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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