The Last Member Query Interval is the Max Response Time
inserted into Group-Specific Queries sent in response to
Leave Group messages, and is also the amount of time
Between Group-Specific Query messages. This value may be
tuned to modify the leave latency of the network. A
reduced value results in reduced time to detect the loss of
the last member of a group. The value of this object is
irrelevant if hwMgmdRouterInterfaceVersion is 1. This object
MAY be modified under any rowstatus condition.