Lenovo RackSwitch G8264CS Application Manual page 432

432
G8264CS Application Guide for ENOS 8.4
Note: To avoid such a scenario, disable IPMC flooding for all VLANs enabled
on the switches (if this is an acceptable configuration).
Check IGMP Reports on switches B and C for information about IGMP

groups.
RS 8264CS(config)# show ip igmp groups
If non‐member IGMP groups are displayed in the table, close the application
that may be sending the IGMP Reports for these groups.
Identify the traffic source by using a sniffer on the hosts and reading the
source IP address/MAC address. If the source IP address/MAC address is
unknown, check the port statistics to find the ingress port.
RS 8264CS(config)# show interface port <port id> interface-counters
Ensure no static multicast MACs and static Mrouters are configured.

 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 8264CS(config)# 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 the multicast traffic reaches the switch to which the host is connected.

Close the application sending the IGMP Reports. Clear the IGMP groups by
flapping (disabling, then re‐enabling) the port.
Note: To clear all IGMP groups, you can use the following command
RS 8264CS(config)# clear ip igmp groups
However, this will clear all the IGMP groups and will influence other hosts.
Check if the multicast traffic reaches the switch.
RS 8264CS(config)# 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 the multicast server is sending all the multicast traffic.
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Ensure no static multicast MACs or static multicast routes are configured.
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Ensure PIM is not enabled on the switches.
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