Cisco CATALYST 2960 - Discovery Through Non-CDP-Capable and Noncluster-Capable Devices; If a cluster command switch is connected to a non-CDP-capable third-party hub (such as a non-Cisco hub), it can discover cluster-enabled devices connected to that third-party hub. However, if the cluster command switch is connected to a noncluster-capable Cisco device, it cannot discover a cluster-enabled device connected beyond the noncluster-capable Cisco device.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
ip igmp profile
Related Commands Command Description
ip igmp filter Applies the IGMP profile to the specified interface.
show ip dhcp snooping
statistics
Displays the characteristics of all IGMP profiles or the specified
IGMP profile number.