Igmp Snooping Overview; Chapter 2 Igmp Snooping Configuration; Principle Of Igmp Snooping - H3C S7500E Series Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches

Chapter 2 IGMP Snooping Configuration

When configuring IGMP Snooping, go to the following sections for information you are
interested in:

IGMP Snooping Overview

Configuring Basic Functions of IGMP Snooping
Configuring IGMP Snooping Port Functions
Configuring IGMP Snooping Querier
Configuring an IGMP Snooping Policy
Displaying and Maintaining IGMP Snooping
IGMP Snooping Configuration Examples
Troubleshooting IGMP Snooping Configuration
2.1 IGMP Snooping Overview
Internet Group Management Protocol Snooping (IGMP Snooping) is a multicast
constraining mechanism that runs on Layer 2 devices to manage and control multicast
groups.

2.1.1 Principle of IGMP Snooping

By analyzing received IGMP messages, a Layer 2 device running IGMP Snooping
establishes mappings between ports and multicast IP addresses and forwards
multicast data based on these mappings.
As shown in
packets are broadcast to all devices at Layer 2. When IGMP Snooping is running on the
switch, multicast packets for known multicast groups are multicast to the receivers,
rather than broadcast to all hosts, at Layer 2.
Figure 2-1, when IGMP Snooping is not running on the switch, multicast
Chapter 2 IGMP Snooping Configuration
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