Patent application number | Description | Published |
20080232375 | PACKET TRANSMISSION DEVICE - There is provided a packet transmission device which comprises a packet transfer processing part and a control part. The packet transfer processing part includes a table memory comprising a path selection table, a link status table, and a node status table. In these tables, information of each of paths, links, and nodes are stored and linked each other. A link/node status monitoring part in the control part monitors a packet outputted from the packet transfer processing part transmission and detects a fault occurred in a transmission of the packet. The fault is reflected on the information of paths in the tables only by updating the information of links and nodes and the path for packets outputted from the device is assigned in a short time. | 09-25-2008 |
20100046533 | ROUTER AND PACKET DISCARDING METHOD - A router controlling a route of packets. The router includes a counter counting an amount of received control packets on a user-identifier-by-user-identifier basis, the control packets being used for managing a network, a discard determining unit comparing a counter value of the counter with a threshold value, and a control packet discarding unit discarding a control packet including a user identifier for which the discard determining unit determines that the counter value exceeds the threshold value. | 02-25-2010 |
20100054132 | COMMUNICATION APPARATUS AND METHOD FOR TERMINATING A MAINTENANCE MESSAGE - A communication apparatus is disclosed for receiving one or more frames from a network. The communication apparatus includes a first determining part configured to search a first table by using a VLAN identifier included in one of the frames, a second determining part configured to search a second table by referring to a search result of the first determining part and using an OAM identifier included in the one of the frames, a selecting part configured to determine whether the one of the frames is an OAM frame according to the search result of the second determining part, and a terminating part configured to terminate the one of the frames determined as the OAM frame by the selecting part. | 03-04-2010 |
20100061267 | PACKET TRANSMISSION APPARATUS AND PACKET TRANSMISSION METHOD - An aspect of the embodiments related to a packet transmission apparatus includes a user identification unit for identifying the user of an input user flow upon input of the user flow containing communication packets and maintenance packets, a maintenance packet extraction unit for extracting the maintenance packets from the user flow of the user identified by the user identification unit, a maintenance packet output control unit for controlling the transparent output of the maintenance packets extracted by the maintenance packet extraction unit based on the monitor rate setting, and a control unit for monitoring and controlling the user flow of the particular user based on the maintenance packets of the user transparently output by the maintenance packet output control unit. | 03-11-2010 |
20100158030 | Routing Apparatus - A routing apparatus couples to another routing apparatus using a trunk formed by a plurality of channels, and has a plurality of input and output cards to input and output frames. Each input and output card includes a management table registering a transmitting source address, destination information, and a trunk attribute indicating whether a channel used for a transmission has a trunk structure, a learning request part searching the management table using a transmitting source address within a frame that is transmitted via the channel, and generating and supplying learning request information having information that is obtained by searching the management table to another input and output card, if the channel used for the transmission has the trunk structure, and a registering part registering learning request information supplied thereto in the management table. | 06-24-2010 |
20100246425 | PACKET PROCESSING APPARATUS, INTERFACE UNIT AND METHOD THEREOF - A packet processing apparatus includes a plurality of communication connecting unit each connected with a communication partner apparatus using one of a work path and a protection path, connecting unit for connecting, using a data bus, the plurality of communication connecting unit with one another; determination unit for, when a packet sent from the communication partner apparatus is received by one of the communication connecting unit, determining whether the packet is a maintenance packet that is used for monitoring a connection state with the communication partner apparatus; and transmitting unit for, when it is determined that the packet is a maintenance packet by the determination unit, transmitting the maintenance packet to the plurality of communication connecting unit using the data bus via the connecting unit. | 09-30-2010 |
20110044190 | COMMUNICATION APPARATUS AND METHOD FOR CONTROLLING THE COMMUNICATION APPARATUS - A communication apparatus comprising a table configured to include a correspondence between at least one of a first identifier that identifies a port from which frames are received, a second identifier that identifies a port from which frames are transmitted, a third identifier that identifies a flow related to a frame received, and a fourth identifier that identifies a flow related to a frame to be transmitted, and a fifth identifier that is different from the first to fourth identifiers, a counter equipped for each fifth identifier, and a controller configured to search the table, each time a frame is received or transmitted, for a fifth identifier by using any one of the first to fourth identifiers related to the frame as a key, and increment a counter corresponding to the fifth identifier by an amount. | 02-24-2011 |
20110051748 | COMMUNICATION APPARATUS AND METHOD IN A COMMUNICATION NETWORK SYSTEM - A communication apparatus including: a reception unit configured to, receive a first frame having a first format and a second frame having a second format in which information is reduced with respect to the first format and extract a first identifier existing in both the first frame and the second frame; a first frame processing unit configured to process the first frame; a second frame processing unit configured to process the second frame; a table including a correspondence between the first identifier and a second identifier indicating whether the first frame and the second frame having the first identifier is in the first format or the second format; and a control unit configured to transfer the first frame or the second frame to one of the first frame processing unit and the second frame processing unit based on the table when the frame is received. | 03-03-2011 |
20110075552 | Apparatus and method for controlling data communication - In a communication apparatus, a receive data processor receives data and retrieves a group data record corresponding to the received data out of a group data memory. A forwarding processor forwards the received data according to the group data record retrieved by the receive data processor. The group data memory stores group data records which associate protection group identifiers with path selection data. The protection group identifiers each identify a protection group that provides logical paths constituting a redundant logical path for transporting a group of data, and their corresponding path selection data specifies which logical path to use to forward data in that protection group. | 03-31-2011 |
20110075559 | COMMUNICATION APPARATUS AND FRAME TRANSMISSION METHOD - A communication apparatus is connected to a network and identifies a flow of a frame input thereto and outputs the frame to a port. The communication apparatus includes: a flow identifying unit that obtains a flow identifier of the flow to which the frame belongs, and that obtains, based on the flow identifier, a hash rule corresponding to the flow identifier; a transfer destination controller that obtains by calculation a hash value of the frame by making use of the hash rule obtained by the flow identifying unit and that decides on an output port for the frame based on combination of the flow identifier and the hash value; and a frame output unit that outputs the frame to the output port decided by the transfer destination controller. | 03-31-2011 |
20110078181 | COMMUNICATION DEVICE - A communication device includes: an entry search information storage unit to store entry flag information indicating a type of an entered frame and entry search information having entry control information as control information of the entered frame, a flag generating unit to generate frame flag information indicating a type of a frame received by the communication device based on frame control information of the received frame, a search key generating unit to generate search key information having all or part of the frame flag information and of the frame control information of the received frame, and a search control unit to control the entry search information storage unit, compare the frame flag information of the search key information to the entry flag information of the entry search information, and search the entry search information having a corresponding comparison result by the frame control information of the search key information. | 03-31-2011 |
20110317551 | COMMUNICATION DEVICE AND METHOD - A communication device includes a processor that is operative to perform actions, including, determining whether a failure occurs in a regular communication channel to transmit a packet to another communication device, selecting, upon determining that the failure occurs in the regular communication channel, a backup communication channel for transmitting the packet, determining, upon selecting the backup communication channel, whether the backup communication channel is shared by the regular communication channel and another regular communication channel, changing, upon determining that the backup communication channel is shared, a priority assigned to the packet transmitted from the regular communication channel to the backup communication channel, and controlling the transmission of the packet in accordance with the changed priority. | 12-29-2011 |
20120008633 | BRIDGE APPARATUS AND COMMUNICATION METHOD - A bridge apparatus including a first line card and a second line card is provided. The first line card includes a first memory storing an association between a line card and a destination address, a first receiver receiving a frame from the second line card including a flag indicating whether a memory of the second line card stores the destination address of the frame, a determination circuit determining whether the first memory stores the destination address of the received frame, when the first flag added to the received frame indicates that the second memory does not store the destination address of the frame, and a first transmitter transmitting, when the determination circuit determines the first memory stores the destination address of the frame, address information associated with at least the destination address of the frame to the second line card, the destination address being stored by the first memory. | 01-12-2012 |
20120099456 | RECEPTION APPARATUS, COMMUNICATION APPARATUS, TRANSMISSION APPARATUS, RECEIVING METHOD, AND TRANSMITTING METHOD - A reception apparatus includes a receiver configured to receive a packet including a label and quality information indicating communication quality for the packet. The reception apparatus also includes a processor configured to allocate a priority to the received packet based on a combination of the label and the quality information included in the received packet and a transmitter configured to supply the packet to which the priority is allocated to a switch that performs transfer control to a packet based on its priority. | 04-26-2012 |
20120287943 | COMMUNICATION APPARATUS AND HEAT GENERATION SUPPRESSING METHOD - A communication apparatus includes a temperature sensor, a memory, and a processor. The temperature sensor measures temperature. The memory stores association groups of packet transmission rates associated with at least one of individual ports and individual transmission flows. The processor selects, based on the measured temperature, one of the association groups for suppressing heat generation, and controls reception rates using the packet transmission rates of the selected association group. | 11-15-2012 |
20130046929 | INTERFACE MODULE, COMMUNICATION APPARATUS, AND COMMUNICATION METHOD - An interface module includes ports; a first memory that stores identifiers indicating processing operations for data blocks associating with the ports; a content-addressable memory that stores keys, each including at least one port and one identifier; a second memory that stores processing information associated with the keys and indicating processing operations for data blocks; an action code circuit that, when a data block has been received, obtains, from the first memory, an identifier set for a port that has received the data block; a generation circuit that generates a key from the port that has received the data block and the identifier obtained by the action code circuit; and a judgment circuit that judges how to process the received data block in accordance with a piece of the processing information associated with the generated key obtained by searching the content-addressable memory using the key generated by the generation circuit. | 02-21-2013 |
20130156031 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus includes a plurality of interface circuits, each interface circuit including a first processor, a plurality of ports, and a first memory configured to store, in each group composed of port of one or more, identification information for the group and identification information for the port belonging to the group, and a switch circuit including, a second processor, a second memory configured to store, in the each group, the identification information for the group and identification information for the interface circuit having port belonging to the group, and a bridge circuit configured to transmit data to the interface circuit. | 06-20-2013 |
20130215890 | COMMUNICATION APPARATUS AND BAND CONTROL METHOD - A communication apparatus includes: an attaching unit configured to attach, to an input frame to be processed in the communication apparatus, a frame identifier of the input frame and a band control correction value corresponding to the frame identifier and the output port; a correction unit configured to correct an amount of data of the frame to be output to a network via the output port, based on the band control correction value; a band control unit configured to control a band of each of the output ports, based on the amount of data of the frame corrected by the correction unit; and an editing unit configured to edit, according to the frame identifier, a frame that the attached frame identifier and correction value thereof has been removed from and that has been band controlled, the edited frame being output to the network via the output port. | 08-22-2013 |
20130301440 | APPARATUS FOR PERFORMING LOOP-FREE TRANSMISSION IN A COMMUNICATION NETWORK - There is provided an apparatus for performing loop-free transmission in a communication network. The apparatus includes a plurality of ports, a controller, a memory, and an interface unit. The controller generates monitoring frames that are transmitted to another apparatus, so as to monitor a connection state of the communication network. The memory includes port-state information that stores a port state in association with each of the plurality of ports. The interface unit processes a frame based on the port-state information and sets, in the port-state information, a stopped state to a first port included in the plurality of ports, in accordance with a time period during which the monitoring frames are not generated. The interface unit discards a frame received via the first port for which the stopped state is set in the port-state information. | 11-14-2013 |
20130329744 | COMMUNICATION CONTROL DEVICE AND METHOD - A communication control device includes a storage unit configured to store source addresses and destination addresses of one or more frames, a determination unit configured to determine respective access proportions for types of accesses to the storage unit, in accordance with an empty state of the storage unit, the empty state being a proportion of the number of empty entries in the storage unit to the total number of entries, and a control unit configured to control whether to access the storage unit, based on the access proportions determined by the determination unit and proportions for accesses having been made to the storage unit. | 12-12-2013 |
20140086250 | COMMUNICATION DEVICE AND ADDRESS LEARNING METHOD - A communication device includes a first memory configured to store transfer information for controlling frame transfer; a processor configured to register a transmission source address of a received frame and corresponding transfer information in the first memory; and a second memory configured to store an upper limit number of registrable addresses for each of designated groups, wherein the processor is configured to determine whether or not the transmission source address of the received frame is registrable in the first memory, based on a result of comparison between a number of registered addresses in a group corresponding to the received frame and an upper limit number assigned to the group corresponding to the received frame. | 03-27-2014 |
20140105020 | FRAME TRANSFER APPARATUS AND FRAME TRANSFER METHOD - There is provided a frame transfer apparatus, which includes: a storage unit configured to store an address and a port in association with the address; a receiving unit configured to receive a frame; a switch unit configured to determine an output port based on a destination address of a received frame; and a transmitting unit configured to transmit the received frame, from the output port determined by the switch unit, wherein the switch unit includes a copying unit configured to copy the received frame when the destination address of the received frame has not been stored in the storage unit, and a rate control unit configured to control an output rate of a frame to be copied. | 04-17-2014 |
20140204778 | COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION METHOD - A communication system includes a first communication device configured to transmit input data to a transmission path, detects a first accumulated amount of the input data, and transmit notifying data to the transmission path when the detected first accumulated amount has reached a threshold value, and a second communication device configured to receive data transmitted to the transmission path by the first communication device, detect a second accumulated amount of the received data, and output measurement information based on the detected second accumulated amount and the threshold value when having received the notifying data. | 07-24-2014 |
20140307733 | SYSTEM AND METHOD FOR CONTROLLING TRANSFER OF A FRAME - An apparatus is connected to a Layer 3 network through a gateway and communicates with lower-level devices. The apparatus includes a storage unit that stores information on a port connected to each lower-level device, in association with a group identifier identifying a terminal group including a plurality of terminals under control of each lower-level device. Upon receiving a frame whose destination information includes information specific to the gateway, the apparatus identifies, based on a terminal identifier identifying a terminal that is a destination of a packet within the frame, a group identifier identifying a terminal group to which the terminal belongs, and transfers the frame from a port associated with the group identifier to a lower-level device controlling the terminal group identified by the group identifier so that the lower-level device updates the destination information of the frame by using information specific to the terminal. | 10-16-2014 |
20150063817 | TRANSMISSION DEVICE AND TRANSMISSION SYSTEM - A transmission device includes: a signal receiving part configured to receive a time division multiplexing signal in which a plurality of packets are stored; a separating part configured to separate the plurality of packets from the time division multiplexing signal; an assigning part configured to assign an identifier corresponding to a stored position in the time division multiplexing signal to each of the plurality of packets; and a packet transmitting part configured to transmit at least two packets having different identifiers out of the plurality of packets through a common transmission path. | 03-05-2015 |