SYSTEM AND METHOD FOR ESTABLISHING PROTECTED CONNECTION

PROBLEM TO BE SOLVED: To provide a system and method for establishing protected connection for eliminating and reducing disadvantages and problems in a conventional system and a conventional method. SOLUTION: There is a step of determining a main path to a first node passing through a first layer in a multilayer network. The main path has a plurality of first layer links. At least one link of the plurality of first layer links has at least one second layer link of second layers. Further, there is a step of determining a subpath to the first node passing through the first layer. When it is detected that the first link of the plurality of first layer links is protected to a link trouble by at least one second layer link, the subpath has the first link of the first layer. When it is detected that the second link of the plurality of first layer links is not protected to the at least one link trouble by the second layer link, the subpath has a third link of the first layer. COPYRIGHT: (C)2008,JPO&INPIT