When no multicast router exists in your network, you can use IGMP Layer 2 Querier to allow the Layer 2 switch to act as a multicast router so that the system can participate in multicast environments where multicast routing is not required.
You must enable IGMP snooping.
When you enable IGMP Layer 2 Querier, Layer 2 switches in your network can snoop IGMP control packets exchanged with downstream hosts and upstream routers. The Layer 2 switches then generate the Layer 2 MAC forwarding table, used for switching sessions and multicast traffic regulation, and provide the recurring queries required to maintain IGMP groups.
By default, IGMP Layer 2 Querier is disabled.
Enable Layer 2 Querier on only one node in the VLAN.
On Shortest Path Bridging (SPB) Customer VLANs (CVLAN), IGMP Querier is enabled automatically when you enable snooping on the VLAN.
You must enable the IGMP Layer 2 Querier address. See EnablingIGMPLayer2QuerierAddress