Information processing system, control device and control method

A control device configured to control a switch device including a plurality of ports, the control device comprising:

• a memory;
• and
• a processor coupled to the memory and configured to:
• specify a flow in which a transmission port is to be changed among the plurality of flows and a transmission port after the change, by referring, for every plurality of flows respectively including a series of packets having a common attribute, to load distribution information that associates flow information for identifying the flows and port information indicating a transmission port from which packets belonging to the flows are to be transmitted with each other and statistics information indicating a use rate of each of the plurality of ports, and
• transmit a changing instruction packet, which includes information of the specified flow and information of the port after the change, for instructing the switch device to change the transmission port to the switch device so that the switch device updates information in header information of each of a series of packets included in the specified flow to information with which the port after the change is selected.

A control method executed by an information processing system that includes a switch device including a plurality of ports and a control device configured to control the switch device, the control method comprising:

• specifying a flow in which a transmission port is to be changed among the plurality of flows and a transmission port after the change, by referring, for every plurality of flows respectively including a series of packets having a common attribute, to load distribution information that associates flow information for identifying the flows and port information indicating a transmission port from which packets belonging to the flows are to be transmitted with each other and statistics information indicating a use rate of each of the plurality of ports;
• transmitting a changing instruction packet that includes information of the specified flow and information of the port after the change to the switch device;
• and
• updating information in header information, which each of the series of packets included in the specified flow includes, so as to become information with which the port after the change is selected, when the changing instruction packet is received from the control device.