Data distribution apparatus, data distribution method, and distribution control program

A data distribution method for delivering multicast data to each of terminals belonging to a multicast group at an L2 protocol, comprising:

• generating a correspondence table, which includes a source address of the terminal and a destination address for requesting the multicast data in association with port information of the terminal;
• discriminating a combination of the destination address and the source address contained in the multicast data being received;
• generating forwarding destination information, which designates a forwarding destination of the multicast data by obtaining the port information of the terminal, included in the correspondence table, corresponding to the discriminated combination of the destination address and source address;
• inserting the forwarding destination information in the multicast data for transfer to an L2 switch;
• and
• selecting each port to transfer the multicast data with referring to the forwarding destination information inserted in the multicast data and a routing table in the L2 switch at the L2 protocol,
• wherein the generating the correspondence table step includes extracting the source address of the terminal and the destination address for requesting the multicast data contained in a control message of the multicast group transmitted from the terminal for managing delivery of the multicast data,
• wherein the generating the correspondence table step further includes generating a virtual LAN (VLAN)-ID, which is unique value corresponding to the combination of the destination address and the source address included in the correspondence table, as the forwarding destination information, and wherein the contents of the correspondence table is transferred to the routing table in the L2 switch,
• wherein the routing table and the correspondence table operate in conjunction with one another to transfer the multicast data, and the correspondence table is an L3 table.

A non-transitory computer-readable data-recording medium having a computer program stored thereon, wherein execution of the computer program by a processor causes a method to be performed, wherein the method is for delivering multicast data to a terminal of a multicast group at an L2 protocol, the method comprising:

• generating a correspondence table, which includes a source address of the terminal and a destination address for requesting the multicast data in association with port information of the terminal;
• discriminating a combination of the destination address and the source address contained in the multicast data being received;
• generating forwarding destination information, which designates a forwarding destination of the multicast data by obtaining the port information of the terminal, included in the correspondence table, corresponding to the discriminated combination of the destination address and source address;
• inserting the forwarding destination information in the multicast data for transfer to an L2 switch;
• and
• selecting each port to transfer the multicast data with referring to the forwarding destination information inserted in the multicast data and a routing table in the L2 switch at the L2 protocol,
• wherein the generating the correspondence table step includes extracting the source address of the terminal and the destination address for requesting the multicast data contained in a control message of the multicast group transmitted from the terminal for managing delivery of the multicast data,
• wherein the generating the correspondence table step further includes generating a virtual LAN (VLAN)-ID, which is unique value corresponding to the combination of the destination address and the source address included in the correspondence table, as the forwarding destination information, and wherein the contents of the correspondence table is transferred to the routing table in the L2 switch,
• wherein the routing table and the correspondence table operate in conjunction with one another to transfer the multicast data, and the correspondence table is an L3 table.