Fujitsu Corporation

Akiko Yamada

Satoshi Imai

Hitoshi Yamada

Toshio Soumiya

Keiichi Nakatsugawa

Shinji Yamashita

Koji Nakamichi

Sho Shimizu

Hitoshi Ueno

Akira Chugo

Hiroki Ichiki

Nobuhiro Kawamura

Akira Nagata

Mitsunori Fukazawa

Li Lei

Kenji Hikichi

Masaya Oda

Katsuichi Nakamura

Seiji Nomiyama

Sugiko Itagaki

Akira Imahase

Takanori Matsunaga

Takashi Iawasaki

Iwao Toda

Ryuuichi Takechi

A wavelength allocation device includes a decision unit, a determination unit, and an evaluation unit. The decision unit decides whether a wavelength bandwidth of an optimum route for a demand has a free bandwidth to which the demand can be allocated. The determination unit allocates the demand to a bypass route, in the case that the wavelength bandwidth of the optimum route does not have the free bandwidth in the decision unit. The evaluation unit integrates the degree of influence of a section on the optimum route, which becomes a bypass factor, based on a difference in a route cost between the optimum route and the bypass route for the demand.

Method of allocating wavelength and wavelength allocation device

A network control apparatus is configured to detect connection relationships among a plurality of network switches in a communication network. The network control apparatus transmits a control signal to a first network switch, where the control signal commands the first network switch to transmit a first topology detection signal from a first plurality of ports provided for the first network switch. The network control apparatus receives, from a second network switch that has received the first topology detection signal, a response signal including topology information that has been detected by the second network switch from the first topology detection signal, and, based on the topology information included in the response signal, controls selection of a target port, via which to transmit a second topology detection signal, from among a second plurality of ports provided for the second network switch.

Apparatus and method for detecting connection relationships among switches in a communication network

A control apparatus includes a generation unit to generate a plurality of entries to be supplied with the switch, the plurality of entries being stored in a storage, a transmission unit to transmit to the switch an integration entry that the plurality of entries is integrated in an integration rule, the switch storing the plurality of entries in a table used for processing input packets, an acquisition unit to acquire the plurality of entries from the storage, and a control unit to perform re-integration processing including generating a re-integration entry integrated the plurality of entries and an additional entry in a re-integration rule created based on content of the plurality of entries and the additional entry, the re-integration entry being transmitted to the switch.

Control apparatus and method for supplying switch with entry

An OpenFlow switch used in an OpenFlow network including a plurality of OpenFlow switches and an OpenFlow controller configured to control the plurality of OpenFlow switches includes: a failure detector configured to detect a failure of a link connected to the OpenFlow controller; and a channel management unit configured to establish an OpenFlow channel to transmit control information to the OpenFlow controller through another OpenFlow switch among the plurality of OpenFlow switches when a failure is detected by the failure detector.

Openflow switch and failure recovery method in openflow network

The processor obtains a process time, which is a time taken for processing a control message when the control device requests that a target processing device, selected from among the plurality of processing devices, process a control message. When the process time has become longer than a first threshold, the processor determines which of a first and a second congestion has occurred based on whether the process time has become longer than a second threshold, which is greater than the first threshold. The first congestion occurs in the transfer devices used for a communication between the control device and the target processing device. The second congestion occurs in the target processing device. The network connection device transmits a request message requesting that a transfer route for which it has been determined that the control message is not processed in a device in which the congestion has occurred be set.

Route determination apparatus and transfer route determination method

In an information processing apparatus, a transmitter forwards received data. A significance determination unit determines significance of the received data. Based on the significance of the received data, an operation mode selection unit selects which operation mode to apply. Power management information stored in a memory describes what power management is to be performed in each different operation mode. A control unit performs power management of the transmitter, with reference to the stored power management information corresponding to the selected operation mode.

Information processing apparatus and control method for selecting operation mode based on a processing load and significance level of received data to operate a transmitter with a proper performance margin

A route control system includes a status measuring unit, a cost management unit, a route determining unit, and a route setting unit. The status measuring unit checks a status of each node included in a network. The status is a wake state or a sleep state. The cost management unit updates a link cost for a link connected to a node in the wake state to a value smaller than any link cost for a link connected to a node in the sleep state. The route determining unit determines an optimum route connecting a first terminal to a second terminal. A sum of the link costs for the optimum route is lowest among the link costs for other available routes connecting the first terminal to the second terminal. The route setting unit sets a requested data flow in the optimum route.

Route control method and route control system

An information processing device, comprising: a traffic control unit configured to regularly check whether packets are transmitted to an adjacent node and received from the adjacent node; and a sleep determination process unit configured to determine whether there is a possibility that packets are transmitted to the adjacent node when no packet is transmitted to the adjacent node and received from to the adjacent node, and to transmit a sleep OK notice to the adjacent node indicating that the adjacent node shift to a sleep mode when the sleep determination process unit determines that there is a low probability that packets are transmitted to the adjacent node.

Sleep-mode control information processing device, storage medium and sleep-mode control method

A control system and method thereof is provided. The control system includes switch devices that operate on supplied power, each switch device includes multiple switch-side ports and a communication processing unit for relaying data, input to any of the switch-side ports on a basis of destination information set for the data, a relay device that includes first ports coupled to corresponding switch-side ports of the switch devices and second ports selectively coupled to the first ports and that relays the data, input to any of the second ports, to any of the first ports, and a control device that controls the switch devices and the relay device, where the control device includes a port monitoring unit, a port-assignment control unit, and a power control unit.

Control system, control device, composite switch device, and control method

An attraction acquisition unit of a first router acquires attraction values of third and fourth routers. When many packets the destination of which is a second router (identifier 'A') are then inputted to the first router, a traffic control unit distributes the many packets among communication interfaces so that a higher volume of traffic is sent to a communication interface with which a larger attraction value is associated. The traffic control unit then sends the many packets via the communication interfaces. As a result, a good part of the many packets are limited to a transmission route via the third router.

Data transmission apparatus for distributing packets

In a routing apparatus, a state data reception unit identifies target paths involving a specified link and finds candidate paths which share their beginning and ending routing apparatuses with any one of the target paths and do not involve the specified link. The state data reception unit obtains state data of each candidate path from a management apparatus managing state data indicating states of routing apparatuses that forward traffic on the candidate paths. Based on the state data of each candidate path, a distribution path selection unit selects a distribution path that minimizes the increase in power consumption due to an expected change in the states of routing apparatuses. A distribution requesting unit transmits a distribution request to the beginning routing apparatus of a target path so as to distribute at least a part of the traffic on the target path to the selected distribution path.

Router, management apparatus, and routing control program

Disclosed is a method of accepting a QoS request for utilizing resources of a network in a predetermined quality. The method receives from a terminal connected to the network a resource unnecessity notification indicating that resource allocated to the terminal has become unnecessary, and holds, as a free resource information, information on a free resource which is a resource notified by the resource unnecessity notification as unnecessary resource. Then, the method receives the QoS request from the terminal, and determines whether the free resource meets the received QoS request or not on the basis of the free resource information. The method allocates the free resource to the terminal when the free resource meets the received QoS request, and transmits information on the allocated free resource to the terminal.

Method for accepting QoS request, and apparatus and computer readable recording medium providing the same

A method for guaranteeing a service quality of a network service is disclosed that includes the steps of storing a historical record of a network service quality, inputting an acceptable maximal service delay of the network service, inputting a desired control level between the service quality of the network service and the number of users of the network service, determining the content of service quality guarantee, which can be provided to each service node, with respect to each pair of service nodes in accordance with the historical record, the maximal service delay, and the control level between the service quality and the number of users, monitoring the service quality between a corresponding pair of service nodes in accordance with the content of service quality guarantee, and regulating the network service between a pair of service nodes in a case where degradation of service quality occurs between the pair of service nodes.

Method, system, program, and readable storage medium for providing service quality guarantee to network service

A QoS information notification method for transmitting QoS information over a multi-domain network includes steps of: (a) a first inter-domain signaling apparatusA transmitting QoS information to a first communication apparatusA; (b) the first communication apparatusA transmitting the received QoS information to a second communication apparatusB; (c) the second communication apparatusB transmitting to a second inter-domain signaling apparatusB the received QoS information and a route through which the received QoS information has passed; and (d) the second inter-domain signaling apparatusB associating the received QoS information with the received route.

QoS information notification method, communication apparatus and inter-domain signaling apparatus for transmitting QoS information over a multi-domain network

A connection-oriented network node capable of becoming an originating node of a protection path serving as a bypath of a protection segment included in a working path in a network system in which data is transferred via a path previously set up between nodes, comprises a usage bandwidth determining unit determining, when setting up the protection path, a usage bandwidth of the setup target protection path on the basis of a working path including the protection segment to be protected by the setup target protection path, and a generation unit generating, if a value obtained by adding the determined usage bandwidth to a current protection path usage bandwidth of an interface transmitting data that is forwarded on the setup target protection path, does not exceed a usable bandwidth for the protection path that is preset with respect to the interface, a signaling message for setting up the setup target protection path to send this message.

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Kawasaki, Japan

Akiko Yamada