Nippon Telegraph and Telephone Corporation

Kabushiki Kaisha Toshiba

Toshiba Memory Corporation

Kioxia Corporation

Meidensha Corporation

Akihiro Kimura

Katsuma Miyamoto

Akihiro Okada

Hideo Tsuchiya

Hiroki Matsushita

Shinya Kawano

Kazuhito Shimomura

Shunsuke Homma

Hideaki Iwata

Hiroaki Sato

Hiroki Kano

Kazunobu Oi

Masakazu Muneshima

Yusuke Ohinata

Yoshio Horiguchi

A communication device, in which a protocol is workable, the protocol enabling formation of a redundancy configuration including a plurality of communication devices by use of a virtual IP address, includes: a table storage unit configured to store a table in which, for each of a plurality of destination networks connected to the communication device through a path, the virtual IP address and the destination network are associated with each other; and a control unit configured to identify, in response to detection of a failure in the path connected to one of the destination networks, the virtual IP address associated with the destination network by reference to the table and cause the identified virtual IP address to transition to another communication device, the another communication device forming the redundancy configuration with the communication device.

Communication apparatus, switching control method and program

According to one embodiment, the memory system includes a nonvolatile semiconductor memory, a data buffer, a volatile memory for storing a management table uniquely associates the user data with an address of the physical storage region of nonvolatile semiconductor memory, a controller that carries out a force quit process for writing the user data stored in a data buffer, the management table stored in volatile memory into the nonvolatile semiconductor memory, and a storage battery. The controller starts the force quit process prior to the power supply of the internal power supply regulator is switched from an external power supply to the storage battery.

Memory system

A communication apparatus which terminates an L2 tunnel and an L3 tunnel includes a table storage unit which stores an ARP table where a broadcast MAC address is set as a destination MAC address linked to a destination IP address, and a transmission unit which acquires the broadcast MAC address as a destination MAC address corresponding to a destination IP address of an IP packet received via the L3 tunnel by referring to the ARP table and transmits a frame to which the broadcast MAC address is added as a destination MAC address, via the L2 tunnel.

Communication apparatus, communication system, communication method and program

When the load becomes high, an identification unit () of a second packet forwarding device () identifies an application of a new flow. Then, a determination unit () determines whether or not distribution of new flow is necessary, based on the flow characteristic of the application and the type of the high load. Then, when distribution of the new flow is necessary, a decision unit () acquires a list of second packet forwarding devices () having a low load from the load monitoring device (), and decides a second packet forwarding device () as the distribution destination. Then, a control unit () performs a route control for guiding the flow to the second packet forwarding device () which is the distribution destination.

Load distribution system and load distribution method

An application information storage unit configured to store information obtained by associating application information including flow characteristics of an application of a flow constituted by a packet with a flow identifier for identifying the flow of the packet, an acquisition unit configured to acquire, in a case where an input port receives a packet, application information of a flow constituted by the packet from the application information storage unit, and an output unit configured to output the packet received by the input port to a packet transfer apparatus in a load state indicating that a load due to the flow of the flow characteristics is light among a plurality of packet transfer apparatuses according to the flow characteristics included in the application information acquired by the acquisition unit are provided.

A storage unit configured to store information regarding flow characteristics indicating whether a flow constituted by a packet is a flow having a tendency to have a large number of short packets or a flow having a tendency to have a large number of long packets in association with destination information of the packet, a determination unit configured to, in a case where an input port receives a packet, determine flow characteristics of a flow constituted by the packet on the basis of the storage unit, and an output unit configured to output the packet received by the input port to a packet transfer apparatus in a load state indicating that a load due to the flow of the flow characteristics is light among a plurality of packet transfer apparatuses according to the flow characteristics determined by the determination unit are provided.

A function management device that manages, in a communication system including a plurality of pieces of customer premises communication equipment and a server capable of providing a function to the plurality of pieces of customer premises communication equipment, the function provided by the server, and includes a resource management unit configured to collect resource information from the plurality of pieces of customer premises communication equipment, a network management unit configured to collect, from the server, network band information of each of the functions, the network band being between the plurality of pieces of customer premises communication equipment and the server, and a function processing unit configured to activate a virtual machine on one of the plurality of pieces of customer premises communication equipment on the basis of the resource information and the network band information to cause a first function selected on the basis of a band occupancy ratio from among the functions provided by the server to be executed.

Function management apparatus, function management method and communication system

In a communication system including first virtual CPE and second virtual CPE, the first virtual CPE includes a band acquisition unit configured to acquire a first contract band set for a subscriber under control of the first CPE and acquire a value of decrease in the first contract band when at least one subscriber terminal of the subscriber transitions from being under control of the first CPE to being under control of the second CPE, and a band control unit configured to control a communication band for the first CPE, and the second virtual CPE includes a band acquisition unit configured to acquire a second contract band set for a subscriber under control of the second CPE and acquire a value of increase in the second contract band, and a band control unit configured to control a communication band for the second CPE.

Communication system and bandwidth control method

A communication apparatus connected to a virtual apparatus having an address dispensing function via an access network is provided, wherein the communication apparatus includes a communication confirmation unit configured to perform a communication confirmation between the virtual apparatus and the communication apparatus; and an address dispensing unit configured to dispense an address to a user terminal under control of the communication apparatus when communication between the virtual apparatus and the communication apparatus is not able to be confirmed by the communication confirmation unit, and the address dispensing unit causes the user terminal to forcibly release the address when the communication between the virtual apparatus and the communication apparatus is able to be confirmed by the communication confirmation unit.

Communication apparatus, communication method and program

In a communication system including a first virtual CPE to which a terminal belongs, a second virtual CPE, and an authentication server, when the terminal connects to the second virtual CPE, the second virtual CPE confirms whether terminal information of the terminal is registered in the authentication server, and when the terminal information is registered in the authentication server, the authentication server notifies the second virtual CPE of an address of the first virtual CPE, and the second virtual CPE performs a tunnel connection to the first virtual CPE.

Communication system and communication method using virtual customer premise equipment

A load distribution system has: determination means for determining, upon an input port receiving a packet, a flow attribute indicating whether a flow configured by the packet is a flow that tends to include many long packets or a flow that tends to include many short packets; and output means for outputting the packet to a packet transfer device in a load state indicating that a load applied by the flow of the flow attribute is low, of a plurality of packet transfer devices, in accordance with the flow attribute determined by the determination means.

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Tokyo, Japan

Akihiro Kimura