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Configuration Guide - IP Multicast

CloudEngine 8800, 7800, 6800, and 5800 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 IPv4 Multicast Packets

Disabling Software Forwarding for IPv4 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 forwards packets performs software forwarding before hardware forwarding entries are generated. After hardware forwarding entries are generated, the switch performs hardware forwarding.

Soft forwarding for 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.

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.

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

  3. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100075361

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