From the navigation tree, double-click IP.
In the IP tree, click IGMP.
In the work area, click the Globals tab.
Select the DynamicLearning check-box to enable dynamic learning for the IGMP interface.
OR
Clear the DynamicLearning check-box to disable dynamic learning for the IGMP interface.
Select an AdminAction: radio button.
In the RangeGroup box, type an IP address.
In the RangeMask box, type a subnet mask.