Lenovo RackSwitch G8264 Application Manual page 510

510
G8264 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.

Ensure the Mrouter is learned on both switches. Note that the Mrouter may

not be learned on switch B immediately after a LAG failover/failback.
RS G8264# show ip igmp mrouter
Ensure the host's multicast application is started and is sending correct IGMP

Reports/Leaves.
RS G8264# show ip igmp groups
RS G8264# show ip igmp counters
 A host receives multicast traffic from the incorrect VLAN
Check port VLAN membership.

Check IGMP Reports sent by the host.

Check multicast data sent by the server.

 The Mrouter is learned on the incorrect LAG
Check link state. LAG 1 might be down or in STP discarding state.

Check STP convergence.

Check port VLAN membership.

 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.

RS G8264(config)# interface port <port id>
RS G8264(config­if)# no storm­control multicast
Check link speeds and network congestion.
