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Multicast Router Query Interval: Specifies the length in seconds between MLD queries. The default value is 125 seconds.

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Multicast Last Listener Query Interval: The maximum time that the router waits before deleting a nonresponsive port from the multicast group. Reducing this value will reduce the time required for the firewall to detect the departure of the last listener for a multicast address or source. The default value is 1000 milliseconds (1 second).

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Multicast Router Query Response Interval: The Maximum Response Delay that is inserted into the periodic MLD queries. By varying the Multicast Router Query Response Interval, an administrator may tune the burstiness of MLD messages on the link; larger values make the traffic less bursty, as host responses are spread out over a larger interval. The Multicast Router Query Response Interval must be less than the Query Interval.The default value is 10000 milliseconds (10 seconds).

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Multicast Router Robustness Variable: Specifies the number of queries that will be sent with no response before the target is deleted. This variable allows tuning the protocol according to the expected packet loss on a link. For lossy links (wireless connections, for example), the value of the Robustness Variable may be increased. The default value is 2. The Robustness Variable should not be configured for less than 2.