Lenovo RackSwitch G8264CS Application Manual page 424

424
G8264CS Application Guide for ENOS 8.4
 IGMP Reports/Leaves sent by the hosts do not reach the Mrouter
Ensure IGMP Queries sent by the Mrouter reach the hosts.
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Ensure the Mrouter is learned on both switches. Note that the Mrouter may
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not be learned on switch B immediately after a LAG failover/failback.
RS 8264CS# show ip igmp mrouter
Ensure the host's multicast application is started and is sending correct IGMP
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Reports/Leaves.
RS 8264CS# show ip igmp groups
RS 8264CS# show ip igmp counters
 A host receives multicast traffic from the incorrect VLAN
Check port VLAN membership.
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Check IGMP Reports sent by the host.
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Check multicast data sent by the server.
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 The Mrouter is learned on the incorrect LAG
Check link state. LAG 1 might be down or in STP discarding state.
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Check STP convergence.
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Check port VLAN membership.
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 Hosts receive multicast traffic at a lower rate than normal
Note: This behavior is expected if IPMC flood is disabled and CPU is enabled.
As soon as the IGMP/IPMC entries are installed on ASIC, the IPMC
traffic recovers and is forwarded at line rate. This applies to unregistered
IPMC traffic.
Ensure a storm control 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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