US 12,088,511 B2
Communication system, communication method, transmitting side switching device, receiving side switching device, and program
Nobuhiro Shibata, Musashino (JP); Hideo Kawata, Musashino (JP); Hideaki Kimura, Musashino (JP); and Shinichi Yoshihara, Musashino (JP)
Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (JP)
Appl. No. 17/802,202
Filed by Nippon Telegraph and Telephone Corporation, Tokyo (JP)
PCT Filed Feb. 28, 2020, PCT No. PCT/JP2020/008465
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/171597, PCT Pub. Date Sep. 2, 2021.
Prior Publication US 2023/0336501 A1, Oct. 19, 2023
Int. Cl. H04L 49/25 (2022.01); H04L 49/15 (2022.01); H04L 49/90 (2022.01)
CPC H04L 49/25 (2013.01) [H04L 49/15 (2013.01); H04L 49/90 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A communication system in which a transmission-side switching device and a reception-side switching device are connected to a plurality of layer 2 networks (L2NWs),
the transmission-side switching device including:
transmission-side relay ports to which respective L2NWs are connected;
a transmission-side connection destination-information memory that retains information concerning each of the transmission-side relay ports and the respective L2NWs; and
a frame duplicating unit, implemented with one or more processors, that duplicates, by a number of the transmission-side relay ports, a frame, input from a transmission-side user device, into a plurality of frames, and transmits the duplicated plurality of frames to the respective L2NWs connected to the transmission-side relay ports,
wherein the reception-side switching device includes:
reception-side relay ports that are connected to the respective L2NWs and through which the plurality of frames are received from the respective L2NWs;
an access accommodation port to which a reception-side user device is connected;
a reception-side-connection-destination-information memory that retains information concerning each of the reception-side relay ports and the respective L2NWs;
a transfer-information memory that retains transfer information for each L2NW, comprising (i) transfer information for a first L2NW indicating that a frame from the first L2NW is allowed to be transferred to the access accommodation port and (ii) transfer information for other L2NWs indicating that a frame from any of the other L2NWs is not allowed to be transferred to the access accommodation port;
a frame selecting unit, implemented with one or more processors, that
selects, from the plurality of frames based on the transfer information for the first L2NW retained by the transfer-information memory, a first frame from the first L2NW, and transfer the first frame to the access accommodation port, and
discards other duplicate frames that are included in the plurality of frames and received from the other L2NWs, based on the transfer information for the other L2NWs; and
an information setting unit, implemented with one or more processors, that changes the transfer information retained by the transfer-information memory when the L2NW transmitting a frame currently transferred to the access accommodation port is switched to another one of the L2NWs.