Transport control server, network system and aggregated path setting method

A network system to switch each aggregated path to a predetermined bypass destination route when a conflict or congestion occurs, comprising:

• a transport control server;
• and
• a plurality of nodes to transfer data according to setting information for aggregated paths reported from the transport control server and aggregated paths concentrating multiple paths between nodes,
• wherein the transport control server includes:
• a traffic information acquisition unit for acquiring traffic information on the network system;
• and
• an aggregated path information storage unit for storing identification information on applicable aggregated path bypass destination routes, into each aggregated path;
• and
• a aggregated group decision unit for deciding into which of the multiple aggregated paths to concentrate the paths, and
• wherein the aggregated group decision unit calculates an expectation value for the applicable aggregated path traffic bandwidth after assigning paths to aggregated paths based on the acquired traffic information, calculates the available capacity of the applicable aggregated path bypass destination route based on the acquired traffic bandwidth, and selects one aggregated path where the aggregated path traffic bandwidth expectation value will not exceed the available capacity of the aggregated path bypass route, and aggregates the applicable paths into the selected aggregated path.

An aggregated path setting method for a network system containing a transport control server and multiple nodes, and each node transfers data according to setting information for paths reported from the transport control server and aggregated paths concentrating multiple paths between applicable nodes, and switches each aggregated path to a predetermined bypass destination route when a conflict or congestion occurs, the aggregated path setting method comprising:

• acquiring traffic information from the network system;
• calculating the expectation value for the aggregated path traffic bandwidth after assigning paths to aggregated paths, based on the acquired traffic information;
• calculating the available capacity of the applicable aggregated path bypass route based on the acquired traffic information;
• selecting one aggregated path where the aggregated path traffic bandwidth expectation value will not exceed the available capacity of the aggregated path bypass route, and aggregating the applicable paths into the selected aggregated path.