| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication system which is capable of distributing multicast data to a reception device which needs to receive the multicast data whose transmission has been stopped. <P>SOLUTION: A communication system comprises a multicast transmission device 2, a reception device, an RP, and a multicast router 1 which is directly connected with the transmission device 2 and relays multicast data. The multicast router 1 comprises a transmission device control unit 13 for transmitting a transmission stop request of multicast data if there is no reception device requesting reception of multicast data, and for transmitting a transmission start request for requesting transmission of multicast data when a transmission request of multicast data is received from the reception device, and a transmission device keeping frame transmission control unit 15 for transmitting an MRP frame notifying transmission information of the multicast transmission device 2 toward the RP when the transmission stop request is transmitted. <P>COPYRIGHT: (C)2012,JPO&INPIT |
