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MULTICAST CONFIGURATION GUIDE
Configuring IGMP
Snooping
Internet Group Management Protocol Snooping (IGMP Snooping) is a multicast
constraint mechanism that runs on Layer 2 Ethernet switches to manage and
control multicast groups.
By listening to and analyzing IGMP messages, a Layer 2 device running IGMP
Snooping establishes and maintains mappings between ports and multicast
groups and forwards multicast data based on these mappings.
Network Diagram
Figure 36 Network diagram for IGMP Snooping
Networking and
Configuration
Requirements
To prevent multicast packets from being flooded at Layer 2, IGMP Snooping is
required on the switch.
■ As shown in Figure 36, Router A connects to a multicast source (Source)
through Ethernet 1/0/2, and to Switch A through Ethernet 1/0/1.
■ Run PIM DM and IGMP on Router A. Enable IGMP Snooping on Switch A.
Router A is the IGMP querier.
■ The source sends multicast data to multicast group 224.1.1.1. Host A and Host
B join multicast group 224.1.1.1.
Application Product
Matrix
Multicast packets
Source
Router A Switch A
Receiver
Receiver
Host B
Host A
Host C
1.1.1.1/24
Eth1/0/4
Eth1/0/2
Eth1/0/3
IGMP querier
Eth1/0/1
Eth1/0/1
10.1 .1.1/24
Eth1/0/2
1.1.1.2/24
Product series Software version Hardware version
Switch 5500 Release V03.02.04 All versions
Switch 5500G Release V03.02.04 All versions