| 主权项 |
1. A relaying apparatus in a communication network including a plurality of relaying apparatuses that are defined to include the relaying apparatus and a plurality of different relaying apparatuses, each of the plurality of relaying apparatuses including at least two redundant-route ports providing a plurality of communication routes between the plurality of relaying apparatuses, a first one of the plurality of relaying apparatuses transmitting a frame via each of the redundant-route ports of the first one, the frame whose transmission destination is a connected apparatus that is connected with a second one of the plurality of relaying apparatuses via a usual port of the second one, the usual port being different from the redundant-route ports, the frame transmitted from the first one entering the plurality of relaying apparatuses other than the first one via the redundant-route ports of the plurality of relaying apparatuses other than the first one,
the relaying apparatus comprising: a first importance determination section that determines whether a first frame has a high importance based on a first rule, the first frame being received via the usual port of the relaying apparatus, the first frame having a transmission destination corresponding to a connected apparatus with which one of the plurality of different relaying apparatuses is connected via the usual port of the one of the plurality of different relaying apparatuses; a number-of-ports switchover section that transmits the first frame via each of the redundant-route ports of the relaying apparatus when the first importance determination section determines that the first frame has the high importance, and transmits the first frame via one of the redundant-route ports of the relaying apparatus when the first importance determination section does not determine that the first frame has the high importance; a second importance determination section that determines whether a second frame has a high importance based on a second rule identical to the first route of the first importance determination section, the second frame being received via one of the redundant-route ports of the relaying apparatus, the second frame having a transmission destination corresponding to a connected apparatus with which the relaying apparatus is connected via the usual port of the relaying apparatus; a first transfer section that transfers the second frame when the second importance determination section does not determine that the second frame has the high importance, the second frame being transferred using the usual port via which the relaying apparatus is connected with the connected apparatus corresponding to the transmission destination of the second frame; an accordance determination section that determines whether all frames received via the redundant-route ports of the relaying apparatus accord with each other when the second importance determination section determines that the second frame has the high importance, all the frames including the second frame received via the one of the redundant-route ports; and a second transfer section that transfers one of all the frames received via the redundant-route ports when the accordance determination section determines that all of the frames accord with each other, the one of all the frames being transferred using the usual port via which the relaying apparatus is connected with the connected apparatus corresponding to the transmission destination of the second frame, and cancels all the frames received via the redundant-route ports when the accordance determination section does not determine that all the frames accord with each other. |
