SDN Multicasting method and apparatus using multicast group sharing tree in software definition network

摘要

The present invention relates to a multicasting method and apparatus using a multicast group sharing tree of a software-defined network (SDN). The present invention provides the multicasting method using a multicast group sharing tree of the SDN, which includes multiple switches, comprising the following steps: obtaining a distance of each receiver within a multicast group by each rendezvous point (RP) candidate switch and obtaining the sum of the distances of all the receivers by each RP candidate switch; comparing the distance of each obtained RP candidate to select a switch with the shortest distance as an RP; setting a path to make the distance between the selected RP and a sender shortest; and generating a tree structure for the path between the RP and the receiver, wherein the selection of the RP, the setting of the path between the sender and the RP and the generation of the tree structure between the receiver and the RP occur when the sender or the receiver participates in or leaves the multicast group. The present invention, when the multicast is applied in an environment of the internet of things where the senders and the receivers become more, can reduce resources of network equipment, can reduce the number of flow objects applied to the switch and can reduce the overload of the RP.