Whether this interface is a 'stub interface'. If this
object is set to TRUE, then no PIM packets are sent out this
interface, and any received PIM packets are ignored.
Setting this object to TRUE is a security measure for
interfaces towards untrusted hosts. This allows an
interface to be configured for use with IGMP (Internet Group
Management Protocol) or MLD (Multicast Listener Discovery)
only, which protects the PIM router from forged PIM messages
on the interface.
To communicate with other PIM routers using this interface,
this object must remain set to FALSE.
Changing the value of this object while the interface is
operational causes the interface to be deactivated and
then reactivated.