Patent application number | Description | Published |
20090196202 | TRANSMITTING APPARATUS AND PATH SETTING METHOD - A transmitting apparatus in a network constituted of a plurality of rings connected via a plurality of routes includes a node type determining unit and a backup path setting message transmitting unit. The node type determining unit determines, on receipt of a working path setting message requesting to set a working path, whether the transmitting apparatus is any one of a branch node at which a backup path is branched off from the working path or a merge node at which the backup path merges into the working path. The backup path setting message transmitting unit transmits, when the transmitting apparatus is determined to be a branch node or a merge node, a backup path setting message specifying a route from a ring including the transmitting apparatus to a connection node connecting the ring and a neighboring ring. | 08-06-2009 |
20100205289 | COMMUNICATION DEVICE FOR PATH CONTROL, AND PATH CONTROL METHOD - Information for performing path control is added to a signaling message used in a network including a higher-level path which accommodates a lower-level path. When a state change occurs in the higher-level path, a communication device extracts using the information a lower-level path to be controlled for the same control item as the control item indicating the state change in the higher-level path. A path to be controlled is selected from among the lower-level paths accommodated in the higher-level path. By controlling the extracted path, a plurality of paths can be easily controlled when there are accommodation relationships among layers. | 08-12-2010 |
20100208721 | ROUTE CALCULATION APPARATUS AND ROUTE CALCULATION METHOD - A route calculation apparatus calculates an intra-domain route in a target domain assigned with the route calculation apparatus. The intra-domain route is a part of a route for a target path in a network divided into plural domains. Each of the plural domains includes at least one node device. The target path passes through transit domains out of the plural domains from a source node device included in a source domain to a destination node device included in a destination domain. The route calculation apparatus includes a calculator and a route calculation requester. The calculator calculates the intra-domain route in the target domain. The route calculation requester requests a first route calculation apparatus assigned to the destination domain to calculate an intra-domain route in the destination domain when the target domain is one of the plural domains except the destination domain and except domains adjacent to the destination domain. | 08-19-2010 |
20100287422 | TRANSMISSION DEVICE AND METHOD FOR PUTTING TRANSMISSION DEVICE TO SLEEP - A transmission device including at least one transmitter/receiver unit that is coupled to another transmission device via a communication line, a power supply unit that supplies power to the at least one transmitter/receiver unit, and a control unit that notifies the another transmission device about first sleep start information specifying time at which an operating mode of the at least one transmitter/receiver unit is to be changed to a sleep mode and that stops the supply of power from the power supply unit to the at least one transmitter/receiver unit at the time specified by the first sleep start information. | 11-11-2010 |
20120096459 | METHOD OF MIGRATING VIRTUAL MACHINE - A method of migrating a virtual machine from a first computer to a second computer includes: performing an external communication of the virtual machine via a first buffer before starting migration of the virtual machine, performing an external communication of the virtual machine via a second buffer different from the first buffer during the migration, starting the migration upon receiving a request for migrating the virtual machine, storing information destined for the virtual machine in the second buffer upon receiving the information during the migration, and transferring the information stored in the second buffer to the second computer in response to termination of the virtual machine. | 04-19-2012 |
20120188866 | COMMUNICATION CONTROL APPARATUS AND COMMUNICATION CONTROL METHOD - A communication control apparatus includes a storage unit and a processor. The storage unit stores, in association with a port number, first address information regarding apparatuses connected to a port identified by the port number. The processor receives a first affected address list containing second address information regarding apparatuses which may be affected by a trouble, extracts the first address information stored in the storage unit in association with a port number of a port via which the first affected address list has been received, selects third address information which is included in both the first and second address information, updates the first affected address list by replacing the second address information with the third address information to acquire a second affected address list, and transmits the second affected address list via each port other than the port via which the first affected address list has been received. | 07-26-2012 |
20130034095 | COMMUNICATION APPARATUS - A communication apparatus includes a plurality of communication ports, a first memory unit, a second memory unit, and a processor. The second memory unit stores address information. Each entry of the address information includes an address of a node in association with one of the plurality of communication ports. The processor receives a message including an address of an incommunicable node via a receiving port which is one of the plurality of communication ports. The processor stores the received address in the first memory unit. The processor transmits the message via the plurality of communication ports other than the receiving port. The processor erases a target entry of the address information from the second memory unit after the transmission. The target entry includes an address which matches the address stored in the first memory unit. | 02-07-2013 |
20130177020 | COMMUNICATION APPARATUS AND CONTROL METHOD - Each edge switch counts the number of times that a first-arrival packet of the same packets was received for each port, and after a predetermined time elapsed, a main edge switch that is determined based on the transmission source and destination MAC addresses identifies a port based on the number of times, and registers the identified port in a table of the main edge switch with the transmission source MAC address. On the other hand, a sub-edge switch clears the number of times once after the predetermined time elapsed, and counts the number of times again. After that, when the predetermined time elapsed again, similar to the main edge switch, the sub-edge switch identifies a port based on the number of times, and registers the identified port in a table of the sub-edge switch with the transmission source MAC address. | 07-11-2013 |
20130243005 | APPARATUS AND METHOD FOR RELAYING A PACKET TRANSMITTED FROM AND TO AN INFORMATION PROCESSOR - An apparatus relays a packet transmitted from and to an information processor via plurality of ports. The apparatus stores, in a memory, first information identifying the information processor in association with a port from which the packet is to be transmitted. When a first packet is received via a first port, the apparatus determines whether second information contained in the first packet and identifying a transmission destination of the first packet is stored in the memory. When the second information is stored in the memory, the apparatus transmits the first packet from a second port associated with the second information, and otherwise transmits the first packet from third ports that are sequentially selected, from among the plurality of ports other than the first port, in variable order that is dynamically determined based on a current traffic state of the plurality of ports. | 09-19-2013 |