Lenovo RackSwitch G8264CS Application Manual page 433

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 IGMP Reports/Leaves sent by the hosts do not reach the Mrouter
Ensure that the primary or secondary Mrouter is reachable. If not, the IGMP
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Reports/Leaves are not forwarded. Note that the Mrouter may not be
reachable immediately after a LAG failover/failback.
RS 8264CS(config)# show ip igmp groups
Ensure the host's multicast application is started and is sending correct IGMP

Reports/Leaves.
RS 8264CS(config)# show ip igmp groups
RS 8264CS(config)# show ip igmp counters
 The Mrouter is reachable on the incorrect LAG
Check link state. LAG 1 may be down or in STP discarding state.
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Check STP convergence and port VLAN membership.
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Check IP connectivity between the switch and the configured Mrouter
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(primary or secondary).
 Hosts receive multicast traffic at a lower rate than normal
Ensure a multicast threshold is not configured on the LAGs.
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RS 8264CS(config)# interface port <port id>
RS 8264CS(config-if)# no storm-control multicast
Check link speeds and network congestion.
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Chapter 26: Internet Group Management Protocol
433