Nippon Telegraph and Telephone Corporation

Taiheiyo Engineering Corporation

Ricoh Company, Ltd.

Kyowa Hakko Kirin Co., Limited

Taiiheiyo Engineering Incorporated

Kyowa Kirin Co., Ltd.

Ken Takahashi

Satoshi Nakatsukasa

Hajime Endo

Tsunetoshi Ito

Shigemasa Kumagawa

Masatoshi Saito

Shigeo Nakajima

Hideo Inoue

Shigeo Nakagima

Kazuto Toyozumi

Hiroki Mori

Masao Hujimori

Toshio Shimada

Ryuma Senoo

Nobuo Kiyama

Masao Tanaka

Hisaya Tanaka

Yoshinobu Konno

Jun Ishibashi

Tsunetoshi Itoh

Takao Kanno

Toshihiro Yokoi

Kairo Wakamatsu

Yasufumi Imamoto

A network monitoring apparatus sets monitoring targets that are physical interfaces included in leaf nodes and spine nodes, links connecting the leaf nodes and the spine nodes, transfer function units included in the spine nodes, and an overlay tunnel set between the originating-side leaf node on the terminating-side leaf node, aggregates monitoring results at the respective monitoring targets, and determines the failure type of a failure and the degree of influence of the failure on the basis of the type of the monitoring target in which the failure has occurred and the occurring event.

Network monitoring device, network monitoring method, and network monitoring program

A delay measurement device measures a delay time of an end-to-end route path of a virtual private network related to a predetermined user. The delay measurement device includes a measurement route generation unit configured to generate a first route that transfers to a start point node of a route path, transfers back on the route path, and then returns to itself, and to generate a second route of a route that transfers to the start point node of the route path and returns to itself; a packet transmission/reception unit configured to transmit and receive packets circulating on the first route; a delay measurement unit configured to measure a time from transmission of the packet to reception of the packet to set the measured time as a delay time of the route; and a one-way delay calculation unit configured to calculate a one-way delay time of the route path.

Delay measurement device, delay measurement method, and delay measurement program

There is provided route control with excellent flexibility even in a large-scale multicast transfer system. A multicast transfer system transfers a multicast packet arriving at a plurality of destinations between multicast communication devices, and a packet transfer processing unitof the multicast communication devicetransfers, when an interface of a multicast communication deviceadjacent to itself is specified as a transfer destination of a received multicast packet, the multicast packet to the specified interface, and transfers, when the interface of the multicast communication deviceadjacent to itself is not specified as the transfer destination of the received multicast packet, the multicast packet to an interface to a multicast communication devicespecified as the destination.

Communication device, multicast transfer system, and multicast transfer method

A software update management apparatus includes a storage unit adapted to divide a network into one or more blocks and store block management information indicating whether each of network devices belonging to each of the resulting blocks is an active device or a standby device; an update instruction receiving unit adapted to receive software update instructions; a software update information generating unit adapted to generate software update information; a software updating unit adapted to perform software update processes after transferring traffic to standby devices in same blocks as respective active devices when it is determined that the network devices are active devices according to the software update information and thereby perform the software update processes for active devices or standby devices in different blocks in parallel.

Software update management device and software update management method

An edge switching device of an edge switching system includes: a remaining lease time information obtainment unit configured to obtain remaining lease time information for each of user terminals from a DHCP server; a submission order determination unit configured to determine a submission order for user configuration information in order from a shortest remaining lease time; a user configuration information submission unit configured to submit, to a backup system edge router, user configuration information of each of the user terminals, according to the determined submission order; and a reconnection inducement instruction unit configured to send, to the DHCP server, an instruction to send reconnection inducement information to the user terminals for which the user configuration information has been submitted.

Edge switching system, edge switching device, edge switching method, and program

A networkis hierarchically divided into network devicesto, areas, and the like to be monitoring targets, and a monitoring devicemonitors a divided monitoring target. A monitoring device of an N-th layer (here, N&#x2265;2) that is an upper layer with respect to a first layer monitors information of reachability between user connection points received from a monitoring device of an (N&#x2212;1)-th layer that is a lower layer and network devices connecting monitoring targets of the (N&#x2212;1)-th layer making up monitoring targets of the N-th layer and connection statuses between the network devices and areas that are monitoring targets. The monitoring device determines the presence/absence of reachability between user connection points belonging to different monitoring targets of the (N&#x2212;1)-th layer on the basis of this reachability and the connection statuses.

Monitoring device, network fault monitoring system, and monitoring method

Disclosed herein are log information collection methods for collecting log information of a network device operating in accordance with instructions from an operation apparatus. In some cases, the log information collection method can comprise: determining whether another piece of the log information including a second character string occurs in a predetermined duration, wherein the niece of log, information includes a first character string; generating a new piece of log information including a third character string; and accepting specifications of the first, second, and third character strings, the predetermined duration, and occurrence or non-occurrence of the piece of the log information and the other piece of the log information.

Log information collecting device and log information collecting method

Implementations are directed to performing path switching quickly and efficiently when path switching is required in a multicast transfer system. In a multicast transfer system, a multicast group for transmitting the same packet from a sender (transmitting apparatus) to a plurality of receivers (receiving apparatuses) is formed. A transfer apparatus holds transfer destination data in which a group identifier for identifying a multicast group is associated with copy transfer destination information (multicast segment) for specifying another transfer apparatus to be used as a packet transfer destination when the packet is received. In copy transfer destination information, a plurality of other transfer apparatuses can be registered by adding a priority, and a plurality of group identifiers can be associated with a single piece of copy transfer destination information.

Multicast transfer system and multicast transfer method

A transfer apparatus configured to control transfer of a packet from a transmission source node to a destination node through segment routing includes: a storage unit storing node management information Tindicating, for each node that functions as a transmission source node or a destination node, an SID list acquisition method of the nodes; a packet reception unit for receiving a reception packet from the destination node; an information setting unit for, if a destination-side SID list acquisition method of the destination node and a transmission source-side SID list acquisition method of the transmission source node do not match each other based on the node management information Tsetting the information that is needed to execute the transmission source-side SID list acquisition method in the reception packet; and a packet transmission unit configured to transmit the reception packet that was subjected to the setting to the transmission source node.

Transfer device and transfer method

[Problem] To allocate IFs to be used in accordance with buffers such that no packet loss occurs in a case in which the transfer apparatus that performs packet transfer includes as many buffers with grouped interfaces (IFs) mounted in units of groups thereon as the number of groups. [Solving Means] A packet transfer apparatusC has a plurality of buffersa ton mounting IFs in units of groups and performs, when the traffic amount at the time of packet transfer of the IFs of each of the buffers exceeds maximum transfer capacity of the IFs, buffering packets corresponding to the exceeding traffic amount in the buffers. An IF allocation unitincluded in the transfer apparatusC selects, in a case in which IF groups with no occurrence of any loss indicating packet discarding are present at the time of the packet transfer in the IFs for a unit time from among all the IF groups, an IF group with a longest non-occurrence time of the buffering from among the IF groups with no occurrence of any loss and performs IF allocation of allocating traffic of packets to the IFs in the selected IF groups.

Transmission device and resource allocation method

[Problem] A route information transfer device that transfers packets advertising route information between routers of different service types is provided. [Solution] The route reflector (route information transfer device)includes: a packet reception unitthat receives packets from a PE (router); an information update unitthat updates a parameter related to the service type included in the received packet according to the PEand the virtual private network, and stores the updated parameter in the service-type information storage unit; an information conversion unitthat refers to the service-type information storage unitand converts the parameter related to the service type of the source PEof the packet into a parameter related to a service-type of the destination PEin an identical virtual private network; and a packet transmission unitthat transmits a packet including the converted parameter to the destination PE

Path information transmission device, path information transmission method and path information transmission program

[Problem] To realize highly flexible network management in accordance with a parameter on which a user places importance. [Solution] A controllerhas: a request input/output unitconfigured to store an input request configuration in a configuration management unit; a measurement information processing unitconfigured to acquire measurement information of a devicedesignated as a request parameter or measurement information of a serverthat accommodates one or more devicesand store the acquired measurement information in a measurement management database; a measurement control unitconfigured to determine whether or not the measurement information in the measurement management databasesatisfies a request conditional expression and activate a corresponding requested action when the request conditional expression is determined to be satisfied; and an apparatus setting unitconfigured to set setting information that follows the activated requested action in the deviceor the server

Network management device and network management method

An ASIC includes: a communication circuit that communicates with a control circuit; a multi-level, fixed-length compression circuit that performs fixed-length compression on scanner-generated image data to output multi-level, fixed-length compressed image data; a tone processing circuit that performs tone processing on the scanner-generated image data to output reduced-level image data; a first selection circuit that selects one of the multi-level, fixed-length compressed image data and the reduced-level image data, as first selected image data to be transmitted by the communication circuit to the control circuit; a multi-level, fixed-length decompression circuit that performs fixed-length decompression on image data received by the communication circuit from the control circuit, to output fixed-length decompressed image data; and a second selection circuit that selects one of the fixed-length decompressed image data and the image data received by the communication circuit, as second selected image data to be output to the plotter.

ASIC and image forming apparatus incorporating same including variable image processing

Provided are a method for preparing a highly versatile aqueous solution having remarkably improved membrane filterability, which can be stably membrane-filtered in a short time, an aqueous solution prepared by the preparation method, a method for culturing cells using the aqueous solution which is prepared by the preparation method, a method for producing a physiologically active substance using the culturing method, a physiologically active substance produced by the method for producing a physiologically active substance, a method for performing membrane filtration of the aqueous solution which is prepared by the preparation method of the aqueous solution, a method for improving membrane filterability of the aqueous solution, and a method for producing the physiologically active substance by preparing the aqueous solution, performing membrane filtration of the aqueous solution, and then culturing cells using the resulting aqueous solution. The present invention relates to a method for preparing an aqueous solution, characterized by addition of a chelating agent.

Method for preparing aqueous solution containing culture medium and chelating agent

The present invention is directed to a method for regulating position of a mining apparatus comprising the steps of transmission of a plurality of signals from a position detection device, interception of said signals at an edge of a mine at a distance away from the position detection device, and adjustment of the position of the mining apparatus to form an intersection between at least two signals at the edge of the mine.

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Tokyo, Japan

Ken Takahashi