Lenovo RackSwitch G8264 Application Manual page 509

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 Not all multicast traffic reaches the appropriate receivers.
Ensure hosts are sending IGMP Reports for all the groups. Check the VLAN

on which the groups are learned.
RS G8264# show ip igmp groups
If some of the groups are not displayed, ensure the multicast application is
running on the host device and the generated IGMP Reports are correct.
Ensure multicast traffic reaches the switch to which the host is connected.

Close the application sending the IGMP Reports. Clear the IGMP groups by
disabling, then re‐enabling the port.
Note: To clear all IGMP groups, use the following command:
RS G8264(config)#
However, this will clear all the IGMP groups and will influence other
hosts.
Check if the multicast traffic reaches the switch.
RS G8264# show ip igmp ipmcgrp
If the multicast traffic group is not displayed in the table, check the link state,
VLAN membership, and STP convergence.
Ensure multicast server is sending all the multicast traffic.

Ensure no static multicast MACs, static multicast groups, or static multicast

routes are configured.
IGMP queries sent by the Mrouter do not reach the host.

Ensure the Mrouter is learned on switches B and C.

RS G8264# show ip igmp mrouter
If it is not learned on switch B but is learned on switch C, check the link state
of the LAG, VLAN membership, and STP convergence.
If it is not learned on any switch, ensure the multicast application is running
and is sending correct IGMP Query packets.
If it is learned on both switches, check the link state, VLAN membership, and
STP port states for the ports connected to the hosts.
clear ip igmp groups
Chapter 32: Internet Group Management Protocol
509