Specifies whether the selected interface is active or passive. You can change the state of a PIM interface after you create the interface but only if you disable PIM on the interface. Use this feature when a high number of PIM interfaces exist and connect to end users, not to other switches.
An active interface accepts PIM control transmitted and received traffic.
A passive interface prevents PIM control traffic from transmitting or receiving, thereby reducing the load on a system.
default ip pim interface-type
ip pim interface-type active
ip pim interface-type passive
The default is active.
GigabitEthernet Interface Configuration