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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring IGMP Snooping

Configuring IGMP Snooping

IGMP snooping enables a Layer 2 device to analyze IGMP messages exchanged between a connected Layer 3 device and downstream user hosts and use these IGMP messages to set up mappings between interfaces and multicast MAC addresses. Based on the mappings, the Layer 2 device can then implement on-demand multicast data forwarding at the data link layer.

Usage Scenario

If IGMP snooping is not configured on any Layer 2 device, multicast data will be broadcast, wasting bandwidth resources. After IGMP snooping is configured on relevant Layer 2 devices, multicast data will be forwarded only to these Layer 2 devices.

Figure 18-1 Multicast packet transmission before and after IGMP snooping is configured on a Layer 2 device


The CEs in this figure need to be deployed with IGMP Snooping.

On the network shown in Figure 18-1, after IGMP snooping is configured on the CE, multicast data will be sent only to user hosts that request it, instead of being broadcast.

Pre-configuration Tasks

  • Configure basic VPLS or VLAN functions.

Data Preparation

To configure IGMP snooping, you need the following data.




VLAN ID or VSI name (used for configuring IGMP snooping)


(Optional) Aging time of a router port


(Optional) Dynamic aging time of a group member and range of groups or sources that user hosts can be promptly join or leave


(Optional) Aging time of entries triggered by multicast traffic


(Optional) Range and number of multicast groups to be limited


(Optional) Configuring Rapid Multicast Data Forwarding on a Backup Device

Configuration Procedures

You can choose to perform the following configuration tasks (except Checking the Configuration) according to the usage scenario.

Updated: 2019-01-03

Document ID: EDOC1100055017

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