Abstract: Provided is a quality-deteriorated part analyzing system capable of analyzing a quality-deteriorated part in a network while increasing the degree of freedom of precision (coverage ratio, sectioning divisions, etc.) independently of the number and installation locations of devices transmitting and receiving flows. Path calculation means 71 determines paths, each passing through one or more directed links between nodes in the network and being regarded as a target of communication quality measurement, and generates a path table which indicates directed links included in each communication quality measurement target section. Quality measurement means 74 measures communication quality based on the flows corresponding to the paths determined by the path calculation means. Analysis means 75 analyzes a communication quality-deteriorated part in the directed links in the network based on the path table and the communication quality.

Abstract: A control apparatus, comprises: a traffic information collection unit that collects per-flow traffic information from a control target node for performing packet processing per flow; a traffic analysis unit that performs totalization per flow based the traffic information to determine a flow whose traffic is expected to increase and a corresponding time period; and a presetting unit that presets control information for processing the determined flow in a node on a path that corresponds to the flow whose traffic is expected to increase during the determined time period.

Abstract: A communication node comprises: a first table for matching against first information in a header of a packet received and deciding an attribute or a right of a source of the packet; a second table for matching against second information in the header of the packet received and finding content of processing for the packet from the source of the packet having the attribute or the right as decided using the first table; and a packet processing unit that, on receipt of the packet, decides the attribute or the right of the source of the packet, using the first table, and that thereafter finds, using the second table, the content of processing for the packet from the source of the packet having the attribute or the right as decided using the first table.

Abstract: A control device reduces its load responding to a transmission request for control information, and includes a control information management unit managing control information including a match field and causes a packet matching the match field to be processed; a transmission request storage unit storing uncontrolled transmission requests in transmission requests for control information for packets received by a switch under the control from the switch; and a request processing unit selecting a piece of control information having a looser match field from among pieces of control information managed by the control information management unit, then selects an unprocessed transmission requests for control information matching the selected piece of control information having a looser match field in unprocessed transmission requests for control information stored in the transmission request storage unit, and replies control information with the looser match field to the switch transmitting the unprocessed transmis

Abstract: To control transmission of a control information transmission request from a switch to a control device. The switch includes: a packet processing unit that processes a received packet by using control information received from a preset control device control device; a communication unit that transmits and receives the control information to and from the control device; and a control unit that controls order of control information to be transmitted and received by the communication unit.

Abstract: The present invention reduces load on a control device responding to a request to send control information that is issued from a switch. A control device includes: a control information management unit that manages control information including a match field and used for causing a packet which matches the match field to be processed; and a request processing unit that, when receiving, from a switch under control, a transmission request for control information for processing a packet which the switch receives, compares a match field of control information managed by the control information management unit with a field, which is to be compared with the match field, of a packet received by the switch, selects, from pieces of control information having match fields which match the field of the packet, a piece of control information having a looser match field, and replies to the switch with the selected piece of control information.

Abstract: A communication system includes: a control apparatus setting control information in a forwarding node(s); a forwarding node(s); and an access control apparatus. The forwarding node(s) forwards packets by using first control information set by the control apparatus and second control information for forwarding packets that do not match a matching condition(s) in the first control information set by the control apparatus from a predetermined port of the forwarding node(s). The access control apparatus includes a determination unit determining whether to generate control information for the packets forwarded from the predetermined port of the forwarding node(s) and requesting the control apparatus to generate control information.

Abstract: A communication terminal comprises: first means that communicates with a network system that includes a forwarding apparatus forwarding a packet and a control apparatus informing the forwarding apparatus of a processing rule prescribing a packet processing method; second means that determines a processing operation to be executed by the network system from among packet processing operations to be executed by the communication terminal; and third means that informs the forwarding apparatus of a processing rule corresponding to the determined packet processing operation.

Abstract: A visualization device is communicable with one or a plurality of host servers for hosting a virtual system, and includes an information acquisition unit for collecting configuration information on the virtual system and the host server, a storage unit for storing the configuration information therein, and a drawing unit for expressing a virtual machine and a virtual network configuring the virtual system with different axes based on the configuration information stored in the storage unit, expressing a connection relationship between a virtual machine and a virtual network by linking the lines extending from the respective axes, and grouping virtual machines in units of server on which the virtual machines operate thereby to generate drawing information for expressing the configuration of the virtual system and the host server.

Abstract: A communication system, includes: a node that requests a processing rule for processing a packet; and a control apparatus that notifies the node of the processing rule in response to the request. The control apparatus, upon being notified of change of a connection relationship between a communication apparatus to which a packet is addressed and the node, determines a forwarding path for a packet addressed to the communication apparatus and notifies the node of a processing rule for realizing the forwarding path.

Abstract: A route request mediation apparatus comprises a resource management unit that manages a resource of a network to be managed; a request receiving unit that receives a route request with an added service level condition from a user or another route request mediation apparatus; a negotiation status management unit that forwards the route request to a destination specified by the route request, and manages a negotiation status based on a response from the destination; an acceptance assessment unit that assesses whether or not to accept the route request by referring to the negotiation status managed by the negotiation status management unit and to the resource management unit; and a response sending unit that responds with an assessment result that indicates whether or not the route request is accepted to the request source of the route request.

Abstract: A communication terminal comprises: first unit that communicates with a network system that includes a forwarding apparatus forwarding a packet and a control apparatus informing the forwarding apparatus of a processing rule prescribing a packet processing method; second unit that determines a processing operation to be executed by the network system from among packet processing operations to be executed by the communication terminal; and third unit that requests the control apparatus to inform the forwarding apparatus of a processing rule corresponding to the determined packet processing operation.

Abstract: A communication system includes: a forwarding node(s) in which a first packet handling operation(s) for processing incoming packets is set and which processes packets in accordance with the packet handling operation(s); a first control apparatus setting the first packet handling operation(s) in the forwarding node(s); a flow control node(s) arranged upstream of the forwarding node(s); and a second control apparatus setting a second packet handling operation(s) in the flow control node(s). The flow control node(s) intercepts forwarding of packets that do not satisfy a predetermined condition(s) to the forwarding node(s) in accordance with the second packet handling operation(s).

Abstract: A network management service system includes a policy management apparatus that receives updating of a communication policy from an user and manages the communication policy for each user; a control apparatus that generates a of a packet associated with the communication policy of the user, in response to a request from the user, and sets the generated in a forwarding node(s); and the forwarding node(s) that processes the packet using the generated by the control apparatus.

Abstract: A communication system includes: a plurality of nodes; a first node transmitting a request for a processing rule for processing a first packet; and a control apparatus including a first unit determining a first processing rule corresponding to the first packet in response to the request and preliminarily determining a second processing rule corresponding to a second packet that relates to the first packet and a second unit notifying the first node of the first processing rule and notifying at least one of the plurality of nodes of the second processing rule.

Abstract: Authentication apparatus authenticates user using host connected to forwarding node. Policy management apparatus holds access control policy for identifying host under access control using identifier of forwarding node or identifier of user, and links identifier of host under access control and identifier of forwarding node to which host is connected, or identifier of host under access control and identifier of user using host. Forwarding node transmits to policy management apparatus identifier of host connected to own forwarding node and identifier of own forwarding node. Authentication apparatus transmits to policy management apparatus identifier of host connected to forwarding node and identifier of user. Policy management apparatus refers to access control policy and, if host connected to forwarding node is under access control, notifies content of access control to control apparatus as access control list.

Abstract: Authentication apparatus authenticates user using host connected to forwarding node. Policy management apparatus holds access control policy for identifying host under access control using identifier of forwarding node or identifier of user, and links identifier of host under access control and identifier of forwarding node to which host is connected, or identifier of host under access control and identifier of user using host. Forwarding node transmits to policy management apparatus identifier of host connected to own forwarding node and identifier of own forwarding node. Authentication apparatus transmits to policy management apparatus identifier of host connected to forwarding node and identifier of user. Policy management apparatus refers to access control policy and, if host connected to forwarding node is under access control, notifies content of access control to control apparatus as access control list.

Abstract: Provided is a quality-deteriorated part analyzing system capable of analyzing a quality-deteriorated part in a network while increasing the degree of freedom of precision (coverage ratio, sectioning divisions, etc.) independently of the number and installation locations of devices transmitting and receiving flows. Path calculation means 71 determines paths, each passing through one or more directed links between nodes in the network and being regarded as a target of communication quality measurement, and generates a path table which indicates directed links included in each communication quality measurement target section. Quality measurement means 74 measures communication quality based on the flows corresponding to the paths determined by the path calculation means. Analysis means 75 analyzes a communication quality-deteriorated part in the directed links in the network based on the path table and the communication quality.

Abstract: Disclosed here is a rotation angle detector capable of detecting unusual value as a rotation angle so as not to output incorrect data. According to the rotation angle detector of the present invention, the first detector, the second detector, and the auxiliary detector rotate at a different speed. Receiving each detecting signal from i) the first and second rotation-detecting sections; ii) the second rotation-detecting section and the auxiliary rotation-detecting section; and iii) the first rotation-detecting section and the auxiliary rotation-detecting section, the controller calculates at least two tentative values for determining the rotation angle of the rotator. When the calculation values are within a predetermined range, the controller determines the detecting signal from the first and second rotation-detecting sections to be the rotation angle of the rotator.

Abstract: Disclosed here is a rotation angle detector capable of detecting unusual value as a rotation angle so as not to output incorrect data. According to the rotation angle detector of the present invention, the first detector, the second detector, and the auxiliary detector rotate at a different speed. Receiving each detecting signal from i) the first and second rotation-detecting sections; ii) the second rotation-detecting section and the auxiliary rotation-detecting section; and iii) the first rotation-detecting section and the auxiliary rotation-detecting section, the controller calculates at least two tentative values for determining the rotation angle of the rotator. When the calculation values are within a predetermined range, the controller determines the detecting signal from the first and second rotation-detecting sections to be the rotation angle of the rotator.