Configuring Multicast Forwarding
IGMP Snooping
Cisco Small Business SFE/SGE Managed Switches Administration Guide 235
9
Configuring Multicast Forwarding
The Multicast section contains the following topics:
• IGMP Snooping
• Defining Multicast Group
• Configuring IGMP Snooping Mapping
• Defining Multicast TV Membership
• Defining Multicast Forwarding
• Defining Unregistered Multicast Settings
IGMP Snooping
When IGMP Snooping is enabled globally, all IGMP packets are forwarded to the
CPU. The CPU analyzes the incoming packets and determines:
• Which ports want to join which Multicast groups.
• Which ports have Multicast routers generating IGMP queries.
• Which routing protocols are forwarding packets and Multicast traffic.
Ports requesting to join a specific Multicast group issue an IGMP report,
specifying that Multicast group is accepting members. This results in the creation
of the Multicast filtering database.
To enable IGMP Snooping:
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