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Static multicast could be defining static multicast paths and/or defining static multicast members.
Dynamic multicast would use a dynamic multicast protocol, e.g. PIM, and hosts using the dynamic membership protocol IGMP.
If you wondering where you might use static multicast, it's used in somewhat unusual situations. For example, years ago I needed to push a multicast stream to a sat uplink. As the sat uplink was unidirectional, dynamic multicast couldn't be used.
Or, during the same time frame I had a mix of Cisco and Brand X equipment. Brand X supported DVMRP, and Cisco supported PIM and some DVMRP. I had to do some "static" multicast to share between the equipment vendors.
