Administrator Guide

Figure 40. Membership Queries: Leaving and Staying
Configure IGMP
Configuring IGMP is a two-step process.
1. Enable multicast routing using the ip multicast-routing command.
2. Enable a multicast routing protocol.
Related Configuration Tasks
• Viewing IGMP Enabled Interfaces
• Selecting an IGMP Version
• Viewing IGMP Groups
• Adjusting Timers
• Preventing a Host from Joining a Group
• Enabling IGMP Immediate-Leave
• IGMP Snooping
• Fast Convergence after MSTP Topology Changes
• Designating a Multicast Router Interface
Viewing IGMP Enabled Interfaces
Interfaces that are enabled with PIM-SM are automatically enabled with IGMP.
To view IGMP-enabled interfaces, use the following command.
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Internet Group Management Protocol (IGMP)