| 摘要 |
A node apparatus for a ring network arranged in a multi-ring formation includes a routing table that defines relationships between a receiving physical line identifier with port number and a sending physical line identifier with port number for virtual ring bypass routes, the relationships being individually provided for respective transmission lines connected to the node apparatus. A detection unit detects, at a time of detection of a failure, each of the relationships from the routing table to determine a transmission line to which a switching request is sent. The detection unit detects, at a time of relaying, each of the relationships from the routing table to determine a transmission line to which one of a switching request and a switching response is sent. The detection unit detects, at a time of receiving of a switching request, each of the relationships from the routing table to determine a transmission line to which a switching response is sent.
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