Abstract:
Trees employing the following two elements are used to determine communicable ranges: paths within a transmission network that are set for data transfer between adjacent communicating devices; and the adjacent communicating devices located at both ends of the paths. The adjacent communicating devices corresponding to the roots of the trees are called adjacent communicating devices located at both ends of a path that has become incommunicable due to a fault within the transmission network.
Abstract:
A transfer apparatus is configured to: calculate a total cost of a first route in a first network that starts from a source transfer apparatus and ends at a destination transfer apparatus; obtain a particular cost being a cost between the source transfer apparatus and a first line, which couples the source transfer apparatus and its own transfer apparatus, in a second route, which starts from the source transfer apparatus and reaches the destination transfer apparatus via its own transfer apparatus; calculate a differential between the total cost and the particular cost; set, based on the differential, a cost between its own transfer apparatus and a second line, which couples its own transfer apparatus and the destination transfer apparatus, to a value that causes the source transfer apparatus to select the second route rather than the first route; and notify the cost value to the source transfer apparatus.