摘要:
[Issues] To provide a node (transfer device) which can process an OAM frame within an output line card.[Solution Method]A node according to the present invention is used in an MPLS (Multi Protocol Label Switching) network, and the node includes an input unit which receives an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live) from outside of the node and an output unit which transmits an OAM frame to outside of the node, wherein the input unit sets the TTL to a specific value and transmits the received OAM frame to the output unit in case a termination destination which an OAM frame received from outside indicates is the node and the received OAM frame is to be transmitted to the output unit and the output unit terminates an OAM frame transmitted from the input unit.
摘要:
A node according to the present invention is used in an MPLS (Multi Protocol Label Switching) network, and the node includes an input unit which receives an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live) from outside of the node and an output unit which transmits an OAM frame to outside of the node, wherein the input unit sets the TTL to a specific value and transmits the received OAM frame to the output unit in case a termination destination which an OAM frame received from outside indicates is the node and the received OAM frame is to be transmitted to the output unit and the output unit terminates an OAM frame transmitted from the input unit.
摘要:
A communication apparatus comprises: a memory unit which correlates a label assigned to a packet and an address of a source of the packet, and memorizes them as an entry; a receiving unit which receives a packet from a network; a learning unit which judges whether or not there exists an entry corresponding to the received packet in the memory unit, and in case there exists no entry corresponding to the received packet in the memory unit, stores a label assigned to the received packet and an address of a source of the received packet in the memory unit; and a processing unit which, in case there exists an entry corresponding to the received packet in the memory unit, assigns an address corresponding to the received packet to the received packet.
摘要:
Between a first pair of termination nodes, a first current-use packet transmission path and at least one first spare packet transmission path are defined. Between a second pair of termination nodes, a second current-use packet transmission path and at least one second spare packet transmission path are defined. When no network fault occurs, packets are transmitted between the pairs of nodes in a 1:1 transfer mode in which the pairs transfer packets via both current-use packet transmission paths only. When a network fault occurs in the first current-use packet transmission path, both transmissions are switched from a 1:1 transfer mode to a 1+1 transfer mode, in which the first pair of nodes transfer packets by using the first current-use packet transmission path and the first spare packet transmission path, and the second pair transfer packets by using the second current-use packet transmission path and the second spare packet transmission path.
摘要:
A communication apparatus comprises: a memory unit which correlates a label assigned to a packet and an address of a source of the packet, and memorizes them as an entry; a receiving unit which receives a packet from a network; a learning unit which judges whether or not there exists an entry corresponding to the received packet in the memory unit, and in case there exists no entry corresponding to the received packet in the memory unit, stores a label assigned to the received packet and an address of a source of the received packet in the memory unit; and a processing unit which, in case there exists an entry corresponding to the received packet in the memory unit, assigns an address corresponding to the received packet to the received packet.
摘要:
A packet transmission system includes a plurality of nodes connected by a packet transmission path. A current-use packet transmission path is used as the packet transmission path when a fault does not occur, and a spare packet transmission path is used as the packet transmission path when the fault has occurred. Each of the plurality of nodes includes: a transfer mode switching section configured to switch a transfer mode when transferring a received packet to a destination node to a 1:1 transfer mode or a 1+1 transfer mode, wherein the packet is transferred by the current-use packet transmission path in the 1:1 transfer mode, but the spare packet transmission path is not used, and the packet is transferred by the current-use packet transmission path and the spare packet transmission path in the 1+1 transfer mode; a path controller configured to instruct the transfer mode switching section to switch the transfer mode; a packet transferring section configured to transfer the received packet in the 1:1 transfer mode when the fault does not occur in the packet transmission network; and a reception path selecting section configured to select one of the packets received from the current-use packet transmission path and the spare packet transmission path in the 1+1 transfer mode.
摘要:
A transmission source node transmits diagnostic frames where a TTL value is set to the number of hops that is counted until an intermediate node. A relay node decrements the TTL value of the received diagnostic frames, counts the number of diagnostic frames where the decremented TTL value is 0, and recognizes continuity between the transmission source node and the relay node based on the number of transmitted diagnostic frames transmitted from the transmission source node and the number of diagnostic frames where the decremented TTL value is 0.
摘要:
A transmission source node transmits diagnostic frames where a TTL value is set to the number of hops that is counted until an intermediate node. A relay node decrements the TTL value of the received diagnostic frames, counts the number of diagnostic frames where the decremented TTL value is 0, and recognizes continuity between the transmission source node and the relay node based on the number of transmitted diagnostic frames transmitted from the transmission source node and the number of diagnostic frames where the decremented TTL value is 0.
摘要:
In a transmission system capable of measuring packet loss ratio between arbitrary devices upon a transmission path without increasing bandwidth of an OAM frame band, a plurality of transmission devices which have been disposed upon a transmission path are provided with a frame analysis unit which receives data frames so as to analyze the type of the data frames, a count processing unit which stores the number of received frames included in the data frames into storage module provided beforehand, an output line end portion which outputs the data frames, and an OAM processing unit which calculates the packet loss ratio in the transmission path using the number of received frames. The frame analysis unit has a function which, if the data frames are OAM frames, copies the data frames and the OAM processing unit has a function which calculates the packet loss ratio using the copied OAM frames.
摘要:
In a hybrid integrated circuit device of the present invention, leads are fixedly attached on the upper surface of a circuit board. The lead includes an island portion, a slope portion, and a lead portion. A transistor and a diode are mounted on the upper surface of the island portion. Electrodes provided on the upper surfaces of the transistor and the diode are connected to a bonding portion through a fine metal wire. The bonding portion of the lead is disposed at a higher position than the island portion. Thus, the fine metal wires connected to the bonding portion are separated from each other.