| 摘要 |
It is possible to reduce the time required for a path recalculation and a path switching upon occurrence of a failure. A path generation unit of a transport control server (TCS) S-1 generates normal path information in accordance with information relating to topology of a network to be established and resource information. Moreover, the path generation unit generates in advance backup path information to be used upon occurrence of a failure in accordance with the prediction topology information and the prediction resource information which have been modified in accordance with a predicted failure position. The path generation unit stores the generated prediction path information in a data storage unit. The TCS (S-1) has a path information report unit which reports the generated normal path information to a node N. The TCS (S-1) also has a failure information acquisition unit which detects occurrence of a failure. When the failure information acquisition unit detects an occurrence of a failure, the path information report unit reports the backup path information stored in the data storage unit to the node N.
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