Network system, controller, and load distribution method

摘要

A 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.

主权项

1. A network system comprising:
a switch configured to transfer a packet; and an external controller configured to set a flow entry for the packet to said switch, wherein said external controller comprises: a heavy load switch detecting section configured to detect said switch as a heavy load switch when said switch is in a heavy load state of new flow entry setting processing; a storage section configured to store a switch list; an alternate route searching section configured to search an alternate route which does not use said heavy load switch, from the switch list; and a flow entry setting section configured to set a new flow entry for a new packet to a new switch on the alternate route searched by said alternate route searching section, and wherein said alternative route includes said external controller.