IP multicast flows can be designated by these notations:
-
(S,G)—
A unique shortest path tree structure between the source and the multicast destinations, pronounced “S comma G.” S is an IP unicast source address, and G is the IP multicast destination address or group.
-
(*,G)—
A common shared tree structure, where a multicast rendezvous point (RP) accepts multicast traffic from the source and then forwards it on to the destinations, pronounced “Star comma G.” The star or asterisk (*) represents the RP, because it is a wildcard source that accepts input from any real multicast source. The G represents the IP multicast destination address or group.
IP multicast or Class D addresses begin with 1110 in the most significant address ...
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