Nippon Telegraph and Telephone Corporation

Ntt Corporation

Toru Mano

Junki Ichikawa

Tomoya Hibi

Hideki Nishizawa

Takeru Inoue

Yukio Tsukishima

Kiwami Inoue

Kazuya Anazawa

Atsushi Taniguchi

Kohei Mizuno

Hitoshi Masutani

Kenji Shimizu

Takahiro Yamaguchi

Yasuhiro Mochida

Masaaki Nishino

Daisuke Shirai

Hirokazu Takahashi

Norihito Yasuda

Kengo Nakamura

Masakazu Ishihata

A connection optimization device that optimizes connections between a plurality of FXC switches for switching connections of optical fibers includes a optimization unit for receiving, as inputs, a number k of FXC switches, a number n of sending/receiving ports, and a connection probability matrix C of the sending/receiving ports and swapping rows and columns of the connection probability matrix C so as to maximize an expected value D in which a connection probability using a short path connecting between the sending/receiving ports connected in the same FXC switch becomes the largest, and a swapping port information output unit for outputting difference information between the connection probability matrix C and the optimization matrix C* in which the rows and the columns are swapped by the optimization unit.

Connection optimization device, connection optimization method, and program

An intermediate deviceA includes a transfer unitthat transfers a request including data to be transmitted from a localto a remote, and a generation unitthat generates a pseudo-response to the request and returns the pseudo-response to the local. The intermediate deviceB includes a discard unitthat discards a response to the request from the remote. An intermediate deviceB includes a generation unitthat generates a pseudo-request based on an initial request for requesting data transmission from the localto the remoteand transmits the pseudo-request to the remote, and a transfer unitthat transfers a response including data to be transmitted from the remoteto the local. The intermediate deviceA includes the discard unitthat discards a subsequent request from the local

Intermediate apparatus, communication method, and program

A communication system includes a plurality of computing machinesandconnected to an optical network, in which the optical network includes a main signal communication pathand a control communication path. Each of the computing machinesandincludes a control unitthat sets a remote direct memory access (RDMA) communication path, and a communication unitthat transmits a setting request including setting information of the RDMA communication path set by the control unitand setting information for setting the main signal communication pathto a computing machine of an access destination via the control communication path; and a main signal transmitting/receiving unitthat establishes the main signal communication pathbased on the setting information of the main signal communication path

Communication system, computing machine, communication method and program

This communication system comprises a plurality of computersthat each comprise: an optical transport path control unitthat adjusts the number of optical transport paths between the computer itself and a connection target computer and that sets the adjusted number of optical transport paths; a remote direct memory access (RDMA) communication unitthat, in accordance with the number of optical transport pathsannounced from the optical transport path control unit, chunks data that is to be transferred to the connection target computer; and an RDMA control unitthat sets RDMA communication paths the number of which is the same as the number of the optical transport pathspursuant to an instruction from the RDMA communication unit

The communication apparatus includes: a processing device that processes communication data to be transmitted to and received from a partner apparatus; a transmission unit that transmits the communication data to the partner apparatus; an internal state measurement unit that measures a state related to transmission of the communication data between the processing device and the transmission unit and a determination unit that determines a communication mode in communication with the partner apparatus from the state. The transmission unit transmits the communication data to the partner apparatus in the determined communication mode.

Communication apparatus, relay apparatus, communication system, communication method, and program

An object of the present disclosure is to propose a technique to enumerate intermediate configurations at high speeds. A configuration enumeration deviceaccording to the present disclosure enumerates a network configuration in an input layer, an intermediate layer, and an output layerthat minimizes the number of mechanical patch panels provided in mechanical patch panels, by using α-quasi-nonblocking configurations, where α being 0 indicates a rearrangeably nonblocking configuration and α being 1 indicates a strictly nonblocking configuration, for 0≤α≤1, when a minimum value C of wiring capacity of mechanical patch panels having the input layer, the intermediate layer, and the output layeris obtained.

Network configuration enumeration device, network configuration enumeration method and network configuration enumeration program

It is an objective of the present disclosure to reduce computational complexity for obtaining a network topology configuration capable of efficiently accommodating a plurality of traffic demands assumed between nodes present in a network. A device of the present disclosure includes: a computation traffic generation unit that creates a traffic demand matrix whose elements are values individually obtained by demands between nodes present in a target network area from a plurality of traffic demand matrices created based on predicted traffic demands between the nodes; and a network topology generation unit that generates a network topology based on the traffic demand matrix generated by the computation traffic generation unit and port information of the nodes in the network area.

Techniques for generating network topologies that accommodate different traffic demands

An object of the present disclosure is to provide a data communication system, a computing apparatus, a data communication method, and a program, which are capable of highly reliable data transfer with low latency between computing apparatuses. The present disclosure achieves a highly reliable communication path by directly connecting computing apparatuses via an optical path and transmitting data through the optical path. Further, the present disclosure uses the optical path to achieve RDAM over wavelength transmission in which existing RDMA-enabled protocol stacks such as InfiniBand and TCP/IP/Ether are eliminated. The present disclosure eliminates the protocol stacks, enabling transfer with lower latency than in a case of 'simply performing RDMA transmission over the wavelength path'.

Data communication system, computer, data communication method, and program

An object of the present disclosure is to make it possible to measure an IP flow corresponding to time-varying, high-speed traffic. The present disclosure is a device that monitors traffic in a network, the device comprising a memory that records, for each flow in the network, metadata and flow information to be used in measurement, wherein a traffic state is forecasted using a packet flowing in the network; and a recording area for the metadata and the flow information in the memory is set based on the forecasted traffic state.

Traffic monitoring device, method and program

An object of the present disclosure is to perform automatic restoration from network failures even when complicated operations for executing a plurality of commands are required. The present disclosure relates to a network setting device that is communicatively connected to a plurality of network devices and performs a setting of the plurality of network devices. The network setting device performs a first step for determining whether a network including the plurality of network devices satisfies a predetermined operational policy. When the predetermined operational policy is not satisfied, the network setting device executes processing for: performing a second step for determining whether a reachable range of a packet expands with addition of one of one or more new candidate commands to a temporary update command sequence; deleting a command at an end of the temporary update command sequence on condition that the reachable range does not expand with addition of any one of the new commands; and then returning to the first step, until the predetermined operational policy is satisfied.

Network setting device, method and program

An object is to provide a traffic monitoring method, a traffic monitoring apparatus, and a program capable of efficiently merging data structures of each of the cores in a multi-core environment without reconstructing a data structure, retrieving a data structure, and adjusting the RSS function. In the traffic monitoring method according to an embodiment of the present invention, the elements of the data structures formed in the cores are compared for each item, and statistic values in the elements are brought together into any one of the elements, and the statistic values of the other elements are set to zero. Redundant elements between the data structures can be removed by ignoring elements having a statistic value of zero at the time of merging data structures.

Traffic monitoring method, traffic monitoring device, and program

An object of the present disclosure is to provide a network device and a method for setting the network device that can, in developing functional modules, perform abnormality detection based on statistical information and setting verification in consideration of a dependency relationship between the functional modules and statistical information and can address a change in a policy in the setting verification and a change in a condition in the abnormality detection. In the network device according to the present disclosure, an existing setting of each module, external information, a dependency relationship, and a policy are collected at one location (setting verification unit) by using a common language. When a new setting is made to the modules, a new dependency relationship is set, or new external information is acquired, the new setting is sent to the setting verification unit and checked against the existing setting, the external information, and the dependency relationship. Then, when the new setting is in a normal range of the policy, the new setting is made to the modules.

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Musashino, Japan

Toru Mano