Nec Corporation

Mamoru Takajo

Masanori Takashima

Kazushi Kubota

Yoji Suzuki

Shihomi Sato

A network system comprises: a terminal(s) that is connectable to a sensor(s), converts data collected by the sensor(s) into second data by performing predetermined processing on the collected data, and transmits the second data to the predetermined apparatus(es) arranged in a physical network(s); the physical network(s) that includes the predetermined apparatus(es); and a control apparatus that controls a virtual network(s) established between the terminal(s) and the predetermined apparatus(es) so that the second data transmitted from the terminal(s) reaches the predetermined apparatus(es).

Network system, terminal, sensor data collection method, and program

A network system is connected to a first physical network comprising: a first data transmission node that transmits data used for a first service and a second data transmission node that transmits data used for a second service and to a second physical network including at least one apparatus for receiving data from the first and the second data transmission nodes, and constructs a virtual network for each service between the first and the second physical networks.

Network system, control apparatus, method for constructing a virtual network, and program

A communication apparatus comprises a packet reception notifying unit that, when receiving predetermined packets, transmits to a predetermined control apparatus a packet reception notification, wherein the packet reception notification indicates that the predetermined packets have been received. Regarding a packet specified by the control apparatus among the predetermined packets, the communication apparatus performs predetermined transmission restraint control of the packet reception notification.

Communication apparatus, control apparatus, communication system, received packet processing method, communication apparatus control method, and program

On the OpenFlow network/normal network boundary, the route cannot be appropriately changed under a communication trouble with the controller. In this invention, the controller makes the route formed by internal switches optimal by updating the Flow table of each internal switch. Among internal switches, the internal switch A forms the optimal route with an external switch to become an active internal switch. The internal switch B forms a redundant route with the external switch to become a standby internal switch. When inability of the connection between the controller and the internal switch A is detected, the internal switch A performs a link-down of the port for connecting to the external switch. When the link-down of the port connecting to the internal switch A is detected, the external switch changes the route so that the traffic to the active internal switch A is transferred to the standby switch B.

Communication route control system and communication route control method

A communication node includes an entry memory capable of retaining a control information entry stipulating a processing to be applied to a packet received, a packet processor referencing the entry memory to process the packet received, and a request suppressing unit. Triggered by reception of a packet, the request suppressing unit requests a preset control apparatus to set a control information entry, and subsequently suppresses control information entry setting requests for a preset time for packets having a characteristic in common with the packet for which the control information entry setting request was made to the preset control apparatus.

Communication node, control apparatus, communication system, packet processing method, communication node controlling method and program

A communication apparatus is provided with: a processing rule storage unit capable of storing a first processing rule for unknown packets set in advance, and a second processing rule set by a control apparatus; a packet processor that processes received packets based on processing rules stored in the processing rule storage unit; and a state notification unit that transmits a predetermined control message to the control apparatus when a packet is processed using the first processing rule. On receiving the predetermined control message, the control apparatus creates the second processing rule to be set in the communication apparatus and sets the second processing rule in the communication apparatus, and also discards packets included in the control message. The communication apparatus continues packet processing using the first processing rule until the second processing rule is set by the control apparatus.

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Tokyo, Japan

Mamoru Takajo