Cisco Cisco IOS Software Release 12.2(14)S

No new or modified standards are supported by this feature.

No new or modified MIBs are supported by this feature.

To obtain lists of supported MIBs by platform and Cisco IOS release, and to download MIB modules, 
go to the Cisco MIB website on Cisco.com at the following URL:

http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml

No new or modified RFCs are supported by this feature.

See the following sections for configuration tasks for this feature. Each task in the list is identified as 
either required or optional.

 (required)

 (optional)

To enable explicit tracking on an interface, use the following commands in interface configuration mode:

To verify configuration of explicit tracking, use the following show commands in EXEC mode:

To verify that explicit tracking is enabled on an interface, use the show ip igmp interface command.

To display IGMP membership information for multicast groups and (S, G) channels, use the show 
ip igmp membership command.

The display output of the show ip igmp groups command is not affected by the explicit tracking 
feature. When explicit tracking is enabled, this output will still display the aggregate membership 
information of an interface.

Router (config-if)# ip igmp version 3

Enables IGMP Version 3 on the interface. 
Version 2 is the default.

Router (config-if)# ip igmp explicit-tracking

Enables explicit tracking on the interface.