Nec Corporation

Takahide Sugita

Shigekazu Harada

Toshiaki Arikawa

Hidetoshi Shinoda

Ryuuichi Ikematsu

Hiroshi Ueno

Saverio Niccolini

Felipe Huici

Jan Seedorf

Hajime Ishikawa

Hajima Ishikawa

A network system includes a server which accommodates a plurality of tenants, at least one network appliance which has a resource shared by the plurality of tenants, a plurality of switches arranged between the at least one network appliance and a network; and a controller which controls the switches. Each switch has a flow table indicating an association of an input source with a transfer destination of packets for each flow, and transfers packets received from the input source to the transfer destination by referring to the flow table. The controller includes an assignment control block which dynamically assigns each of a plurality of tenants to any of the at least one network appliance; a route design block which designs a flow route for each of the tenants; and a switch setting block which sets the flow table for each of switches along the designed route.

Network system, control method thereof and controller

When an appliance, which has a packet discard function, discards a packet, transmits packet discard information as information related to the discarded packet to a controller. A controller performs a switch control process in response to the packet discard information. In the switch control process, the controller selects a target switch from the network, creates entry setting information for instructing the target switch to create an entry such that a packet belonging to the same flow as the discarded packet is discarded, and transmits the created entry setting information to the target switch. The target switch sets an entry in its own flow table in response to the entry setting information transmitted from the controller.

Network system, controller, and network control method

A network distribution monitoring method is executed by a computer which configures each of a plurality of nodes, in a network which comprises the plurality of nodes which are connected with a management network. The network distribution monitoring method includes: generating a first detection message by detecting a first traffic on an object network of a corresponding one of a plurality of first predetermined applications, in each of first probe nodes of the plurality of nodes; transmitting the first detection message to a node determined from a first hash value to only a first function identifier showing a kind of the corresponding one or the first function identifier and address data of the first traffic; generating a first mediation processing result by performing first mediation processing on the first detection message to the plurality of first applications, in a first mediation node of the plurality of nodes; and storing a result of the first mediation processing in a first collector node of the plurality of nodes. In this way, the distribution monitoring system is provided in which it is possible to monitor the advanced function.

Distribution monitoring system, distribution monitoring method, and program

Disclosed are the multiplex communication system and the method therefore. A fault detection part of a duplex switching device detects it as generation of fault when recognizable signals are not detected from a connected line within a prescribed time. When the fault detection part detects the generation of fault in the present system line, the line switching part switches the lines from the present line to the standby line to perform communication between a terminal device and another terminal device therethrough. Also, the fault detection part notifies the generation of fault to the other duplex switching device after a prescribed switching protection time has passed from the time of the fault detected by the fault detection part, so the selection of the lines becomes consistent.

Optical transmission switching device

Multiplex communication system and method

Growing community of inventors

Tokyo, Japan

Takahide Sugita