A wide area network using the internet as a backbone utilizing specially selected ISX/ISP providers whose routers route packets of said wide area network along private tunnels through the internet comprised of high bandwidth, low hop-count data paths. Firewalls are provided at each end of each private tunnel which recognize IP packets addressed to devices at the other end of the tunnel and encapsulate these packets in other IP packets which have a header which includes as the destination address, the IP address of the untrusted side of the firewall at the other end of the tunnel. The payload sections of these packets are the original IP packets and are encrypted and decrypted at both ends of the private tunnel using the same encryption algorithm using the same key or keys.

Wide area network using internet with high quality of service

A communication system includes a node that processes a received packet; and a control device that sets a processing rule, which defines a matching rule and processing for a packet that conforms to the matching rule, in the node. The node holds an identifier in association with a processing rule and determines whether or not to perform processing for a received packet depending upon whether or not an identifier of the received packet corresponds to an identifier associated with a processing rule corresponding to a matching rule that conforms to the received packet, wherein the processing is performed according to the processing rule corresponding to the matching rule that conforms to the received packet.

Communication system, node, control server, communication method and program

Link identifiers such as VIDs, selected from a defined range of values, are locally assigned by each node on a link state protocol controlled Ethernet network to each of its links or adjacencies. The link identifiers are assigned by the nodes such that each link or adjacency at the node is uniquely identified by a different link identifier. A link state protocol adjacency notification mechanism or other flooding mechanism is used to disseminate the locally assigned link identifiers to other nodes on the link state protocol controlled Ethernet network. The link identifiers are added by the nodes to their topology databases to enable detour routes to be locally calculated by the nodes on the network in a distributed manner. Upon occurrence of a failure, the link identifiers are used to source route traffic around the failure so that traffic may continue to traverse the link state protocol controlled Ethernet network.

Distributed failure recovery in a routed ethernet network

The present disclosure provides virtual router/switch systems and methods with a domain of optical switches operating as a single, virtualized router using a control plane design combining centralized control of higher layer packet switching functions with distributed control over transport switching functions. The virtual router systems and methods simplify and reduce cost of Internet Protocol (IP) networks by removing the core routers, replacing them with lower cost, high capacity optical switches which are Packet Optical Transport Systems (POTS). The virtual router systems and methods avoids full mesh connectivity of the edge routers and the associated need to maintain routing adjacencies to each of the other edge routers. The virtual router systems and methods include a centralized IP layer management. Further, the virtual router systems and methods include distributed control of the optical layers.

Virtual core router and switch systems and methods with a hybrid control architecture

A multi-protocol label switching network or domain (1), and method of operating the same. Label switching control paths are established for forwarding control packets between routers (E1-E4, C1-C6) according to control labels assigned to the control packets by a label assignment server (2). Control labels are assigned by assigning a respective unique control label to respective directional pairs of edge routers, each directional pair comprising a combination of an edge router pair and a direction between the edge routers of the pair. Traffic data paths are also established for forwarding traffic data packets between the routers according to traffic data labels assigned to the traffic data packets. The traffic data labels are distinct from the control labels, and the traffic data paths are different from the control paths.

Multi-protocol label switching

An optical network (1001) includes: a plurality of optical edge routers (1003) having optical path establishing means (1316) and connecting an external IP network (1002) to the optical network (1001); and a plurality of optical cross connect devices having switching means on optical path basis for connecting the edge routers (1003) to one another by an optical path. The optical edge routers (1003) include both of (1) an optical network control instance INSp having topology information in the optical network (1001) and performing optical path routing and signaling and (2) an IP network instance INSi having an external IP network routing table and operating a routing protocol between the edge routers and the external IP network. With this configuration, it is possible to realize a multi-layer linkage function and provide an optical network having a high stability.

Optical network, optical edge router, program thereof, cut through method, and edge router

There are provided a data transmission device and a data transmission system capable of reducing the cost required for arranging a communication device corresponding to each of different communication protocols in one station and a the cost required for building a network. The data transmission device includes: data reception means (110) for receiving a packet based on different communication protocols from upstream data transmission devices (51, 52, 53); contained information extraction means (120) for extracting contained information contained in a packet; line selection information storage means (130) for storing line selection information used for selecting a communication line based on different communication protocols; line selection means (140) for selecting a communication line corresponding to the contained information according to the line selection information, and data transmission means (150) for transmitting data to the downstream data transmission devices (61, 62, 63) connected to the communication line selected by the line selection means.

Data transmission device and data transmission system

PROBLEM TO BE SOLVED: To solve the problem that setting is so complicated that unexpected switching can occur due to the setting in a method for ensuring reliability in a one station concentrated Ethernet network in which many P-P connections are gathered, which becomes a reliability technology for multipoint connection. SOLUTION: To solve the problem, a P-P path is defined between an Ethernet device (3-2) and an Ethernet device (3-3) to perform communication between LANs #A in the Ethernet network (3-1). A P-P logic path between the Ethernet device (3-2) and the Ethernet device (3-3) is automatically set by exchanging a VLAN (virtual LAN) ID in the Ethernet network (3-1) between adjacent devices. An Ethernet device (3-4) constructs tables for VLAN IDs of the Ethernet device (3-2) side and VLAN IDs of the Ethernet device (3-3) side and switches logic paths on the basis of the table. The reliability of a logic path is ensured by setting the logic path with two routes which are primary and backup. COPYRIGHT: (C)2003,JPO

Ethernet controlling method, network, device, and method for controlling the same

PROBLEM TO BE SOLVED: To provide a data transfer unit which is capable of efficiently transferring data while realizing protocol processing similar to an expensive and multi-functional IP packet transfer device by utilizing an inexpensive layer-2 switch or layer-3 switch without using said IP packet transfer device. SOLUTION: The data transfer unit comprising a function of the layer-2 switch or the layer-3 switch includes a means for determining a transfer destination based on a VLAN Tag imparted to data inputted from the outside and transferring the data inputted from the outside to a next data transfer unit or a next packet transfer device. Furthermore, the data transfer unit includes a VLAN tag transfer table and the means compares the VLAN tag imparted to the data inputted from the outside with the VLAN Tag transfer table and determines the transfer destination of the data inputted from the outside. COPYRIGHT: (C)2005,JPO&NCIPI

Data transfer unit and control apparatus

PROBLEM TO BE SOLVED: To transmit accurate data through an optical data transmission network which performs data transmission between terminals through an optical path comprising an optical fiber, an optical amplifier, an optical switch, etc., even if a transmission processing means and a reception processing means of the terminal are dynamically changed. SOLUTION: The optical data transmission network is equipped with: a transmission processing means of converting data of the terminal into communication data for network transmission; a means of converting the communication data from an electric signal to an optical signal; the optical path which transmits the communication data; a means of converting the communication data passed through the optical path from an optical signal to an electric signal; and a reception processing means of receiving the converted communication data and transferring it to the terminal, wherein the transmission processing means is equipped with a transmission speed control means for the communication data and the reception processing means is equipped with a reception speed control means. Then the optical data transmission network sends and receives speed control data for changing a transmission speed and a reception speed between the transmission speed control means and reception speed control means to determine the transmission speed of the communication data. COPYRIGHT: (C)2005,JPO&NCIPI

Keisuke Kabashima

Papers

Optical network, optical edge router, program thereof, cut through method, and edge router

Data transmission device and data transmission system

Ethernet controlling method, network, device, and method for controlling the same

Data transfer unit and control apparatus

Optical data transmission network and transmission speed control method for optical data transmission network