Method for multicast packet transmission in software defined networks

A method for transmitting multicast packet data, for a software-defined data communication network (SDN) having:

• at least one input port configured to receive at least one data packet from a multicast group of packet data provided by at least one external traffic source;
• at least two output ports configured to transmit the at least one data packet of the multicast group and to receive requests from at least one external traffic consumer;
• and
• at least one network node configured to transmit the at least one data packet of the multicast group according to configured switching rules;
• at least one SDN controller configured to generate switching rules and configure the switching rules on the at least one network node;
• the method comprising:
• receiving, via the at least two output ports, a request from the at least one external traffic consumer to receive the at least one data packet of the multicast group;
• receiving, via the at least one input port, the at least one data packet of the multicast group from the external traffic source;
• and
• generating, by the at least one SDN controller the switching rules and configuring the switching rules on the at least one network node for transmitting the at least one data packet, the generating of the switching rules being executed such that:
• for a given one of the at least one external traffic consumer, the given one of the at least one external traffic consumer being the first to request the at least one packet data of the multicast group, determining a shortest path from (i) a given one of the at least one input port associated with the given one of the at least one external traffic consumer to (ii) a given one of the at least two output ports associated with the given one of the at least one external traffic consumer;
• for a subsequent external traffic consumer, requesting the at least one packet data of the multicast group, determining a shortest path from a network node closest to a given one of the at least two output ports associated with the subsequent external traffic consumer where the switching rules for the at least one multicast group are set;
• and
• causing the at least one packet of the multicast group to be transmitted from the at least one input port to at least one of the at least two output ports according to the switching rules,
• wherein the determining of the shortest path includes applying a search algorithm that calculates path lengths based on a topology of the SDN.