CONTROLLER AND CHANNEL RESETTING METHOD

PROBLEM TO BE SOLVED: To provide a controller capable of effectively utilizing resources usable for channel resetting processing while reducing the load accompanying the channel resetting imposed on the controller and reducing the time required for channel resetting.SOLUTION: When a failure is detected on a channel which is formed a plurality of network switches, the controller can change a channel resetting method for resetting the channel for data flow which is to flow through the channel on which the failure has been detected on the basis of the number of data flows (N) which is to flow through the channel on which the failure has been detected and the load (X, Y) imposed to the controller.SELECTED DRAWING: Figure 10 【課題】コントローラの経路再設定処理に利用可能なリソースの有効利用を図って、経路再設定に伴うコントローラの負荷の低減と経路再設定の時間短縮と、を図る。【解決手段】コントローラは、複数のネットワークスイッチによって形成される経路の障害検出に応じて、障害が検出された経路を通るデータフローの経路を再設定するための経路再設定方法を、障害が検出された経路を通るデータフロー数（Ｎ）とコントローラの負荷（Ｘ，Ｙ）とに基づいて変化させてよい。【選択図】図１０