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* In order to join a multicast group, G, a host conveys its membership information through the Internet Group Management Protocol ([[IGMP]]).
* The ''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text'''''''''Bold text''''''Bold text'''''''''''''''''''''''''''''' then forwards data packets addressed to a multicast group G to only those interfaces on which explicit joins have been received.'''
* A Designated Router (DR) sends periodic Join/Prune messages toward a group-specific Rendezvous Point (RP) for each group for which it has active members.
** Note that one router will be automatically or statically designated as the rendezvous point (RP), and all routers must explicitly join through the RP.
* Each router along the path toward the RP builds a wild card (any-source) state for the group and sends Join/Prune messages on toward the RP.
** The term route entry is used to refer to the state maintained in a router to represent the distribution tree.'''''''Italic text'''''''Italic text''''''Bold text'''''''
** A route entry may include such fields as:
*** source address
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