Which of the following enables a WLC to identify whether an AP has active multicast recipients for a particular group address?
IGMP snooping lets the WLC process client IGMP membership reports and maintain multicast-group information associated with clients and their APs. The controller can therefore determine which APs have active listeners for a given multicast group and ensure that only those APs transmit the multicast traffic on the WLAN. A CAPWAP group address only transports multicast traffic to APs; it does not identify APs that have subscribed clients. IGMP membership reports are generated by multicast listeners, while routers normally issue IGMP queries.
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