Cisco Cisco IOS Software Release 12.0(19)S

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      Explicit Tracking of Hosts, Group, and Channels for IGMP Version 3
show ip igmp membership
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Cisco IOS Release 12.0(19)S
Related Commands
I - v3lite
Indicates that an IGMP v3lite report was received for this entry.
D - Urd
Indicates that a URL Rendezvous Directory (URD) report was 
received for this entry.
M - SSM (S, G) channel
Indicates that the multicast group address is in the Source Specific 
Multicast (SSM) range.
1,2,3 - The version of IGMP... The version of IGMP that the multicast group is running.
/
Interface
Interface type and number.
Table 1
show ip igmp membership Field Descriptions (continued)
Field
Description
Command
Description
ip igmp version
Configures the version of IGMP that the router uses.
Enables explicit tracking of hosts, groups, and channels for IGMP 
Version 3.
show ip igmp groups
Displays the multicast groups with receivers that are directly connected to 
the router and that were learned through IGMP.