Patent ID: 8279758

Claim:
A communication node system in a network, the network having: a first transmission equipment which communicates user data with a second transmission equipment and a third transmission equipment, using a path, a first controller which communicates messages for maintaining a state of the path, with a second controller and a third controller connected to the node of the first controller, and which manages the transmission equipment of its own node, a data plane in which a plurality of transmission equipments including the first transmission equipment, the second transmission equipment, and the third transmission equipment are connected, and which communicates user data, and a control plane in which a plurality of controllers including the first controller, the second controller, and the third controller are connected, and which communicates the messages, wherein the data plane and the control plane are configured of different media, where the communication node system is configured such that: the first controller exchanges the messages with the second controller to detect existence or nonexistence of a fault of the second controller; when the first controller detects the existence of the fault of the second controller, the first controller checks existence or nonexistence of fault alert detection of the first transmission equipment, where the first controller and the first transmission equipment belong to a same node; in a case where the fault alert detection of the first transmission equipment does not exist, the first controller maintains a path state of the path, and when a third controller is in a normal state, the first controller sends a message to the third controller to maintain the path state with the third controller; and in a converse case, where the fault alert detection of the first transmission equipment exists, the first controller removes the path state of the path from the first controller, the second controller and the third controller, and cleans up resources.