NETWORK RELAY SYSTEM AND NETWORK RELAY DEVICE

PROBLEM TO BE SOLVED: To provide a device for implementing simplification of control and prevention of deterioration in setting performance, by making data planes on the local side and the remote side look like the same when seeing the planes from a control plane.SOLUTION: A network relay system is composed of a plurality of communication devices 1000. Each communication device includes a data plane 20 for transferring an input packet according to routing information; and a control plane 1100 having a CPU 1110 for learning the routing information and a control system repeater 1120. The network relay system is configured so that non-blocking communication can be implemented between data planes in the respective communication devices. A control system repeater of an operation system in a communication device receives routing information from a CPU, sets the routing information to the data plane in the communication device, and transmits the routing information to a control system repeater in another communication device. A control system repeater of a standby system in a communication device receives the routing information and sets the routing information to the data plane in the communication device.