Abstract: A network management apparatus and a network management system are provided which are capable of reducing setting workloads required when an initial setting operation of a network communication apparatus is performed, and a network structure is changed. The network management apparatus acquires information as to respective network communication apparatus which belong to the same network when an operation of the network is commenced, or when a structure of the network is changed. Then, the network management apparatus determines a concrete operating content of said network communication apparatus based upon the acquired information and an operation policy so as to set the determined operating content. Also, the network management apparatus is equipped with a GUI (Graphical User Interface) used to set a role of the network communication apparatus by a manner.

Abstract: In a system having physical machine resources and network component resources, a resource management technique is provided that is effective for deploying virtual machines utilizing these resources. A surplus policy regarding surplus resources is prepared as a parameter adjustable by the system administrator. A placement plan generating program at a VM placement plan generating server generates placement plans for virtual machines in response to alteration of the surplus policy. Then, a placement plan verification program at the VM placement plan generating server validates whether each of the created placement plans complies with the altered surplus policy. This validation is performed by simulating the amounts of utilization of both physical machine resources and network component resources. The VM placement plan generating server presents the placement plans that passed this validation, as those causing no problem in performance, to the system administrator through the use of an administrator terminal.

Abstract: A routing control system comprising a system controller and master and slave routing servers, wherein the master routing server includes a plurality of logical controllers, each of which performs routing control for each of the user networks, the system controller monitors a load state of the master routing server and migrates at least one of the plurality of logical controllers from the master routing server to the slave routing server when the load state has satisfied a predetermined condition, so that the slave routing server inherits routing control for a particular user network associated with the migrated logical controller.

Abstract: In a packet forwarding apparatus having a plurality of interfaces for connection to external networks, at least one of the interfaces is designated as an extension interface, and an extension apparatus having an additional function is connected to the packet forwarding apparatus via the extension interface. An ingress packet having been received by another of the network interfaces and for which the additional function is to be used is forwarded to the extension apparatus and the ingress packet processed with the additional function is inputted again to the packet forwarding apparatus via the extension interface and sent out to a corresponding external network from a network interface corresponding to the destination address of the ingress packet.

Abstract: Provided is a network system, comprising: a plurality of network devices; a network constructed from the plurality of network devices; and a management server managing the network. The plurality of network devices include a first network device in which a filter assigned as a target of reconfiguration is set and a second network device coupled at a lower level of the first network device. The management server obtains topology of the network from the plurality of network devices; reconfigures, by referring to the obtained network topology, the filters of the first and second network device such that a range in which a packet can be forwarded through a reconfiguring filter set in the first network device is made equal to a range in which a packet can be forwarded through the filter set in the second network device; and sets the reconfigured filters into the network devices.

Abstract: Provided is a management computer which reduces the workload of an administrator of a network in setting node when the normal network is changed to a network with redundancy. The management computer manages a plurality of nodes that constitute a network accommodating VLANs. The plurality of nodes include a first node and a second node which make a redundancy pair and which divides the network into an active path and a standby path. The management computer stores port management information showing connection relations for respective nodes and identifiers of VLANs allocated to ports of the nodes, and creates the redundancy pair by updating the port management information of the first node such that a VLAN allocated to one of ports of a connected node that is connected to the first node is allocated to one of ports of the first node that is connected to the connected node.

Abstract: A modular type node apparatus for packet communication wherein, when an extension module is added to a switching unit, a control packet to request setting of forwarding control parameters indicating flow definition information of a packet to be processed by the extension module and an internal address is issued from the extension module to a control module of the packet communication node apparatus. The control module automatically sets a table entry indicating the relationship of the flow definition information and the internal address of the extension module in a packet forwarding control table to be referred by each of network interface modules.

Abstract: A packet forwarding apparatus wherein a routing control packet received from a network is forwarded to both active and standby routing modules, the standby routing module executes predetermined routing control information processing and sends identification information of the routing control packet to the active routing module, the active routing module executes predetermined routing control information processing, returns a response packet to a sender of the routing control packet, and determines a state of the standby routing module depending on whether an internal control packet has been received from the standby routing module and its contents.

Abstract: Provided is a computer system capable of cutting the cost of running and managing a company network and improving the security of the network by reducing wrong settings and skipped settings due to human factor. The computer system has switches which constitute a network, a management computer which is connected to the network and manages the network, and clients which are connected to the switches. The management computer sets each switch such that client authentication is executed at port provided in the switch that can be connected to the client. The client authentication is processing of verifying whether the client has the right to connect to the network.

Abstract: The invention reduces the initial setting cost, the management cost, and reconfiguration cost of QoS guarantee for network devices. A management device has a control unit and the storage unit. The control unit obtains the number of terminals contained in the network system and connection relations of the network system at the time of initial setting for QoS guarantee. A control unit stores an operation policy which an administrator inputs. The control unit creates QoS control configuration for each connection path between adjacent two network devices using the number of terminals in the network system, the connection relations, and the operation policy. And QoS control configuration is the information for controlling the QoS guarantee of network devices. And the control unit sets the QoS control configuration in the network devices.

Abstract: A network management apparatus and a network management system are provided which are capable of reducing setting workloads required when an initial setting operation of a network communication apparatus is performed, and a network structure is changed. The network management apparatus acquires information as to respective network communication apparatus which belong to the same network when an operation of the network is commenced, or when a structure of the network is changed. Then, the network management apparatus determines a concrete operating content of said network communication apparatus based upon the acquired information and an operation policy so as to set the determined operating content. Also, the network management apparatus is equipped with a GUI (Graphical User Interface) used to set a role of the network communication apparatus by a manner.

Abstract: The purpose of the invention is to provide a distributed cache system applicable to a large-scale network having multiple cache servers. In a distributed cache system including multiple cache control servers, the content information is divided and managed by each cache control server. When content requested from a client is stored in the distributed cache system, a cache cooperation router forwards the content request to the cache control server which manages the information of the requested content. A cache control server has a function to notify its own address to the distributed cache system when the cache control server is added to the distributed cache system. When a cache control server receives the notification, it sends content information to the new cache control server and synchronizes the content information. Thus, a cache control server can be added to the system with ease.

Abstract: Provided is a packet transmitting apparatus included in a network, for transferring a frame in the network, including: a configuration managing module for setting a frame transfer function and a filtering function based on a configuration; a configuration setting module for providing an interface that accepts an instruction regarding the configuration for an administrator; and a configuration transmitting/receiving module for transmitting/receiving the configuration to/from another packet transmitting apparatus, in which the configuration transmitting/receiving module makes a request for the configuration to the another packet transmitting apparatus, receives the configuration from the another packet transmitting apparatus, and updates the configuration of this apparatus based on the received configuration, and the configuration managing module sets a filtering condition of a transfer frame based on the updated configuration.

Abstract: In a packet forwarding apparatus having a plurality of interfaces for connection to external networks, at least one of the interfaces is designated as an extension interface, and an extension apparatus having an additional function is connected to the packet forwarding apparatus via the extension interface. An ingress packet having been received by another of the network interfaces and for which the additional function is to be used is forwarded to the extension apparatus and the ingress packet processed with the additional function is inputted again to the packet forwarding apparatus via the extension interface and sent out to a corresponding external network from a network interface corresponding to the destination address of the ingress packet.

Abstract: A router with a server incorporated to provide services has a problem in that the server's resource cannot be allocated dynamically according to user requests. Service request packets received at a plurality of network interfaces are controlled such that the total bandwidth of the service request packets does not exceed a preset threshold. This makes it possible to process as many service requests from users as possible while limiting a server resource occupied by one service to a fixed amount. The network interfaces are notified of how much of a server resource is occupied by each service. In the case where one service consumes less than its allocated resource amount, the resultant surplus resource is made available to other services by easing the bandwidth control on other services. The above problem is thus solved.

Abstract: A module type node apparatus for packet communication of this invention includes an extension module for executing predetermined processing and a node apparatus main body for forwarding packet data to the extension module, the extension module including a memory for storing connectivity authentication data, and a module controller for transmitting the connectivity authentication data stored in the memory to the node apparatus main body for packet communication when the connectivity authentication data is requested from the node apparatus main body for packet communication, the node apparatus main body for packet communication being characterized by further including a connectivity authentication unit for authenticating permission of connection of the extension module based on the connectivity authentication data received from the extension module, and a connection controller for receiving the packet data from the extension module when the connectivity authentication unit permits the connection.

Abstract: A modular type node apparatus for packet communication wherein, when an extension module is added to a switching unit, a control packet to request setting of forwarding control parameters indicating flow definition information of a packet to be processed by the extension module and an internal address is issued from the extension module to a control module of the packet communication node apparatus. The control module automatically sets a table entry indicating the relationship of the flow definition information and the internal address of the extension module in a packet forwarding control table to be referred by each of network interface modules.

Abstract: A packet forwarding apparatus wherein a routing control packet received from a network is forwarded to both active and standby routing modules, the standby routing module executes predetermined routing control information processing and sends identification information of the routing control packet to the active routing module, the active routing module executes predetermined routing control information processing, returns a response packet to a sender of the routing control packet, and determines a state of the standby routing module depending on whether an internal control packet has been received from the standby routing module and its contents.

Abstract: The invention provides a prepreg, formed by impregnating carbon fiber with an epoxy resin composition comprising an epoxy resin (A) and a curing agent (B) wherein the matrix resin content Wr (wt %) of the prepreg, the 0° tensile modulus E (GPa) of the carbon fiber, and the in-plane shear strength of S (MPa) of the carbon fiber reinforced composition material obtained by heating and curing the prepreg satisfy the following formulae (i) and (ii): S≧205×LOG(E)+610  (i) 15≦Wr≦40  (ii) The prepreg has a high in-plane shear strength, a high mode I interlayer fracture toughness GIC, an excellent CFRP tube in torsion al strength, a high radial compressive strength and a high impact strength and a light weight.