Ring network system, failure recovery method, fault detection method, node, and the node for the program

摘要

In the multi-ring network connecting a plurality of RPR ring is applied, so that it can failure recovery at high speed in the event of a failure of the inter-ring. Contact node connected to the (505) working interlink (700-1,700-3) to transmit and receive signals KeepAlive regularly with each other. When the KeepAlive signal is not the predetermined time is reached, it is determined that a failure has occurred in the (505) interlink, each node broadcasts a interlink fault notification RPR-MAC frame indicating a failure in the interlink to. Each node that receives a interlink fault notification RPR-MAC frame and the contact node of the source of the interlink fault notification RPR-MAC frame, to flush the contents of the learning-learning database itself has immediately. In addition, contact nodes that are connected to the pre-interlink (506) switches to the forwarding state preliminary interlink the (506).