Abstract: A packet routing apparatus includes a plurality of interface units each includes, a first memory in which a plurality of routing information used in a routing of a packet are stored, a second memory in which the plurality of routing information are stored, the number of the routing information stored in the second memory being smaller than the number of the routing information stored in the first memory, and a retrieval unit configured to detect a packet length of the packet received at any of the plurality of ports, perform the routing based on the plurality of routing information stored in the second memory when the detected packet length is less than a predetermined value, and perform the routing based on the plurality of routing information stored in the first memory when the detected packet length is greater than or equal to the predetermined value.

Abstract: There is provided a communication apparatus including a hardware processor configured to: count numbers of transmissions and receptions of a measurement frame assigned between frames when a communication of an active system is performed, by an active system counter, count numbers of transmissions and receptions of the measurement frame when a communication of a standby system is performed, assign switchover indication information for indicating an occurrence of the switchover from the active system to the standby system, to the measurement frame to be transmitted to other communication apparatus, and measure a data loss based on a count value of the active system counter or the standby system counter, by excluding frames transferred during a period of time from a transmission of the switchover indication information to a reception of the reception indication information transmitted from the other communication apparatus which has received the switchover indication information, from a measurement target.

Abstract: There is provided a transmission device including an associative memory in which, when data is specified, contents of the memory are searched for the data and an address of a location in which the data has been found is read out; a detector configured to detect an access rate to the associative memory; an estimation unit configured to estimate a temperature of the associative memory, based on the access rate to the associative memory; a prediction unit configured to predict a time period until the temperature of the associative memory reaches a specified temperature, based on the temperature estimated by the estimation unit; and an access controller configured to control an access to the associative memory, based on the time period predicted by the prediction unit.

Abstract: A packet routing apparatus includes a plurality of interface units each includes, a first memory in which a plurality of routing information used in a routing of a packet are stored, a second memory in which the plurality of routing information are stored, the number of the routing information stored in the second memory being smaller than the number of the routing information stored in the first memory, and a retrieval unit configured to detect a packet length of the packet received at any of the plurality of ports, perform the routing based on the plurality of routing information stored in the second memory when the detected packet length is less than a predetermined value, and perform the routing based on the plurality of routing information stored in the first memory when the detected packet length is greater than or equal to the predetermined value.

Abstract: There is provided a transmission device including an associative memory in which, when data is specified, contents of the memory are searched for the data and an address of a location in which the data has been found is read out; a detector configured to detect an access rate to the associative memory; an estimation unit configured to estimate a temperature of the associative memory, based on the access rate to the associative memory; a prediction unit configured to predict a time period until the temperature of the associative memory reaches a specified temperature, based on the temperature estimated by the estimation unit; and an access controller configured to control an access to the associative memory, based on the time period predicted by the prediction unit.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: When a data word is designated through a network search engine, a FIFO unit, and the like, a relay apparatus according to the invention searches for an associative memory address corresponding to the data word. Even when the associative memory address is internally converted to a contents memory address, the relay apparatus stores the contents memory address by causing it to correspond to a search result corresponding to the contents memory address as well as outputs the associative memory address together with the search result.

Abstract: 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.

Abstract: 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.

Abstract: When a data word is designated through a network search engine, a FIFO unit, and the like, a relay apparatus according to the invention searches for an associative memory address corresponding to the data word. Even when the associative memory address is internally converted to a contents memory address, the relay apparatus stores the contents memory address by causing it to correspond to a search result corresponding to the contents memory address as well as outputs the associative memory address together with the search result.

Abstract: 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.