Optical node device, network control device, maintenance-staff device, optical network, and 3R relay implementation node decision method

Or with the required minimum number of required minimum capability 3R repeaters efficient use of network resources constituting the optical network economy. Holding the 3R section information corresponding to topology information of the optical network they belong, with reference to 3R section information held in the setting via their optical paths autonomously determine whether it is to implement 3R relay optical node device. Or other optical node devices, in that it is the source node, the other optical node devices via the optical path from itself to the destination node to a specific other embodiments 3R relayed optical node device, a request for the particular set themselves in It is a 3R relay implementation node of the source light path.