Hosts use the Internet Group Management Protocol (IGMP) to report their IP multicast group memberships to neighboring multicast routers. Configure IGMP on an individual interface basis.
Important
The spbm-config-mode boot flag must be disabled before you can configure PIM or IGMP. To verify the setting, enter show boot config flags in Privileged EXEC mode.
Complete one of the following tasks:
Configure IGMP on a Layer 2 interface by enabling IGMP snoop.
Configure IGMP on a Layer 3 interface by enabling multicast routing, for example, Protocol Independent Multicast-Sparse Mode (PIM-SM) or Protocol Independent Multicast-Source Specific Multicast (PIM-SSM).
Important
To configure and use IGMP on a VRF instance you must first select and launch the VRF context.
To select and launch the VRF context, see Configuring IGMP on a VRF.