Patent ID: 8547850

Claim:
A transport control server for a network system including the transport control server, multiple nodes, and a network connecting the transport control server and the multiple nodes, where the transport control server is configured to provide setting information to set: paths for each node to transfer data, aggregated paths concentrating multiple paths between nodes, and predetermined bypass destination routes to switch each aggregated path to when congestion occurs, and the transport control server comprising: a traffic information acquisition unit for acquiring traffic information for the network system; an aggregated path information storage unit for storing identification information on applicable aggregated path bypass destination routes, for each aggregated path of the aggregated paths; an aggregated group decision unit for deciding into which of multiple aggregated paths, to concentrate non-aggregated paths; wherein the aggregated group decision unit: assigns the non-aggregated paths to candidate aggregated paths; calculates an expectation value for an applicable aggregated path traffic bandwidth for each of the candidate aggregated paths, based on the acquired traffic information; calculates an available capacity of the applicable aggregated path bypass destination routes, based on the expectation value; selects one aggregated path where the expectation value will not exceed the available capacity of the aggregated path bypass destination route; and aggregates the non-aggregated paths into the selected aggregated path.