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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

NOTE:

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.

No.

Data

1

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

2

(Optional) Aging time of a router port

3

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

4

(Optional) Aging time of entries triggered by multicast traffic

5

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

6

(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.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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