GENERATION METHOD OF RING CONFIGURATION INFORMATION FOR BLSR(BIDIRECTIONAL LINE SWITCHED RING) NETWORK

PROBLEM TO BE SOLVED: To provide a generating method of ring configuration information (ring topology map), by which each node can automatically update the ring topology map at a high-speed. SOLUTION: When generating the ring topology map, by using node ID values of nodes configuring a ring network as MAP information values and sequentially loading the ID values from the top node to the last node to MAP information in one direction of the ring, each node 1 transmits the MAP information, including its own ID value at a top of the MAP information, to a next stage (node); loads the ID value included in the top information value of the information received from a preceding stage (node) to the last transmission sequence of the information; sequentially loads the ID value, received successively to a prescribed transmission sequence of the information, receives the ID value from the preceding stage node until the ring topology map loading the ID values stored in the transmission sequence of the information is continuously the same; and sequentially transmits the ID value loaded to the transmission sequence of the information to the next stage load. An overhead byte is desirably used for the ID values transmitted/received.