Fujitsu Corporation

The University of Tokyo

Shinji Yamashita

Tsuyoshi Yamamoto

Tamotsu Akashi

Kohei Shibata

Hirofumi Aota

Toshio Soumiya

Akiko Yamada

Hiroyuki Furukawa

Nobuhiro Fukushima

Kazuyuki Mori

Yoshinobu Kubota

Sho Shimizu

Yuji Ishii

Toshiya Kishida

Shinichi Takeuchi

Osamu Tsuboi

Hiroyuki Fujita

Keiichi Nakatsugawa

Naoki Hashimoto

Toshihiko Kurita

Masaaki Kawai

Kenji Hikichi

Kenji Rikimaru

An anomaly detection method executed by a computer, the anomaly detection method includes identifying, for each of target periods, a prediction value to be a reference for determining whether an anomaly occurs in the target period; identifying a corrected prediction value acquired by correcting the prediction value of a first target period based on the prediction value and a measured values of a second target period before the first target period; setting one of the prediction value and the corrected prediction value corresponding to the first target period as an upper limit value and the other as a lower limit value; and determining whether the anomaly occurs in the first target period by using a reference defined by the upper limit value and the lower limit value.

Anomaly detection method and storage medium

Provided is an anomaly detection method implemented by a computer, the anomaly detection method including identifying a time period during which time-series data of a parameter relating to a network have a periodicity, when a first time is within the time period, determining whether the network has an anomaly using a first method based on the time-series data, and when the first time is not within the time period, determining whether the network has an anomaly using a second method different from the first method.

Anomaly detection method and non-transitory computer-readable recording medium

An information processing method for a computer to execute a process includes, acquiring a plurality of pieces of time-series data; calculating an index value that relates to periodicity at a certain time interval for each piece of aggregated time-series data obtained by dividing and aggregating the plurality of pieces of the time-series data in accordance with a certain unit of aggregation; determining the each piece of the aggregated time-series data as an analysis target when the index value satisfies a certain condition; and performing certain analysis processing on the analysis target.

Information processing method, storage medium, and information processing device

A network analyzer includes a storage and a processor to provide an answer to inquiry including an inquiry statement and device log. The storage stores first information indicating relation between a previously received inquiry statement and an answer for the inquiry statement and second information indicating relation between previously received device log and an answer for the device log. The processor selects a first answer candidate for a new inquiry statement and calculates a first degree of certainty of the first answer candidate based on the first information. The processor selects a second answer candidate for new device log corresponding to the new inquiry statement and calculates a second degree of certainty of the second answer candidate based on the second information. The processor determines an answer based on the first answer candidate, the first degree of certainty, the second answer candidate, and the second degree of certainty.

Network analyzer that provides answer to inquiry about network failure and network analyzing method

An information processing apparatus is configured to acquire first communication amount information indicating a first communication amount per unit period of time of each of a plurality of flows at a first timing, specify a predictive communication amount per the unit period of time of each of the plurality of flows at a second timing later than the first timing, acquire second communication amount information indicating a second communication amount per the unit period of time of each of the plurality of flows at the second timing, specify a difference between the predictive communication amount and the second communication amount, specify a priority degree of each of the plurality of flows based on the difference and a topology value determined for each of the plurality of flows, and analyze the data traffic of a specific flow selected from the plurality of flows based on the priority degree.

Information processing apparatus, method and non-transitory computer-readable storage medium

There is provided a traffic management apparatus including a memory, and a processor coupled to the memory and the processor configured to select a base model based on history information stored in the memory so as to generate a traffic model, obtain a predicted value of the traffic according to the traffic model, and detect traffic abnormality based on the predicted value and an actual measurement value of the traffic.

Traffic management apparatus and traffic management method

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

A packet processing apparatus receiving a packet includes a memory storing a flow information, and a processor coupled to the memory and configured to, when a processing method for the received packet is defined in the flow information, store the packet into a buffer in the packet processing apparatus and process the packet stored in the buffer using the processing method, when the processing method is not defined in the flow information and a utilization rate of the buffer exceeds a threshold value, transmit the packet to another packet processing apparatus, and when the processing method is not defined in the flow information and the utilization rate of the buffer does not exceed the threshold value, store the packet into the buffer and issue an inquiry about the processing method.

Packet processing apparatus, packet processing method, and non-transitory computer-readable storage medium

An information processing system includes a plurality of computers, a plurality of relay devices having a memory which stores a first parameter combination for selecting a first transfer path from a plurality of paths for coupling to each of the plurality of computers, and a management computer which stores, in the memory, a second parameter combination for selecting a second transfer path from the plurality of paths when a traffic of any one of couplings for coupling each of the plurality of relay devices exceeds a given amount, wherein the plurality of relay devices set a transfer destination of received data by selecting information corresponding to computer combination information included in the received data from any one of the first parameter combination and the second parameter combination.

Information processing system, relay device, information processing device, and information processing method

An information processing method includes dispersively assigning a virtual machine and a storage device that stores data to be processed by the virtual machine, to a combination of data centers coupled to each other through a relay device, reducing a response time from a time when a request for a process is transmitted to the virtual machine to a time when a result of the process is returned from the virtual machine after accessing to the storage device through the relay device by the virtual machine.

Information processing method, recording medium, and information processing device

An optical communication system includes a plurality of wavelength selective switches arranged on an optical network; and an optical network management apparatus configured to manage and control the optical network. In response to a path establishing request, the optical network management apparatus determines power consumption of each path that satisfies the path establishing request in the optical network based upon a wavelength being used at a connection port of each of the wavelength selective switches, selects a route based upon the determined power consumption of each of the path, and sets the selected route in the optical network.

Optical communication system, optical network management apparatus and optical network management method

An optical network includes: an optical switch; a plurality of optical interface devices provided respectively for a plurality of servers and connected to the optical switch; and a manager to manage communication traffic of the plurality of servers. Each of the optical interface devices includes a fixed-wavelength optical transmitter and a wavelength tunable optical transmitter. A first optical path is set up via the optical switch by using the fixed-wavelength optical transmitters of the plurality of optical interface devices. The manager identifies first and second optical interface devices from among the plurality of optical interface devices in accordance with the communication traffic of the plurality of servers. A second optical path is set up between the first and second optical interface devices via the optical switch by using the wavelength tunable optical transmitters of the first and second optical interface devices.

Optical network and optical path setup method

A gateway apparatus relays communication between first and second servers provided in a data center and an external communication apparatus located outside the data center. A control apparatus obtains an observation result obtained by observing a communication amount being an amount of data transmitted/received per unit time for each of virtual machines operating in the first and second servers in association with a transmission source and a destination of the data. When the first number of hops is smaller than the second number of hops, the control apparatus controls an arrangement of the virtual machines so that the virtual machine whose communication amount with the external communication apparatus is larger is more likely to be placated in the first server.

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Kawasaki, Japan

Shinji Yamashita