NETWORK SYSTEM, CONTROLLER, AND LOAD DISTRIBUTION METHOD

摘要

A network system is provided which can avoid a packet transfer delay due to increase of switch load. The network system has a switch which transfers a packet and a controller which sets a flow entry to the switch. The controller has a heavy load switch detecting section which detects a heavy load switch with the heavy load of new flow entry setting processing; a storage section which stores a switch list; an alternate route searching section which searches an alternate route; and a flow entry setting section which assigns a flow of packets to be transferred by using a new flow entry of the heavy load switch to the switch on the alternate route, without changing the flow entry which is already set to the heavy load switch.