209 results about "Network redundancy" patented technology

Some embodiments provide a method for providing redundancy and fast convergence for modules operating in a network. The method configures modules to use a same anycast inner IP address, anycast MAC address, and to associate with a same anycast VTEP IP address. In some embodiments, the modules are operating in an active-active mode and all nodes running modules advertise the anycast VTEP IP addresses with equal local preference. In some embodiments, modules are operating in active-standby mode and the node running the active module advertises the anycast VTEP IP address with higher local preference.

The present invention is a system and method to improve the reliability and performance of existing enterprise IP networks which have dual-homed (or multi-homed) network architectures. In one aspect of the invention packets related to a selected category of transmission (e.g., VoIP) are duplicated at an edge router and sent over both (multiple) service providers. After traversing the service provider networks, only the first-to-arrive packets are kept and the later-arriving copies are discarded. In so doing, the result is better protection against node failures, link failures, and packet errors, and also better QoS performance under normal (fault-free) operation.

Each of an upper switch apparatus and lower switch apparatuses is connected to ports of a same port number of a pair of middle switch apparatuses by setting link aggregation, the pair of the middle switches are connected to each other via redundancy ports. When failure occurs at a port, connected to the lower switch apparatus, of one middles switch apparatus of the pair, the one middle switch apparatus adds input port information to a frame addressed to the failed port to transfer the frame to another middle switch apparatus of the pair from the redundancy port, and the another middle switch apparatus receives the frame from the redundancy port and transfers the frame in accordance with the input port information added to the frame.

A design and proof of concept of a new type of WLAN, complete with simulation and results from the simulation has been described. Each AP Node is implemented as a self-contained embedded OS unit, with all algorithms resident in its Operating system. The normal day-to-day functioning of the AP node is based entirely on resident control algorithms. Upgrades are possible through a simple secure communications interface supported by the OS kernel for each AP node. Benefits provided by a wireless network, as proposed in this invention, are that: it installs out of the box; the network is self-configuring; the network is redundant in that mesh network formalism is supported, ensuring multiple paths; load balancing is supported; there is no single point of failure; allows for decentralized execution; there is a central control; it is network application aware; there is application awareness; there is automatic channel allocation to manage and curtail RF interference, maximize non interference bandwidth and enable seamless roaming between adjoining wireless sub networks (BSS) and it supports the wireless equivalent for switching—for seamless roaming requirements.

Interconnection devices and interconnect a network running a redundancy protocol and another network running a redundancy protocol. The interconnection devices controls the redundancy protocol of a lower level network via virtual ports and by a virtual link, to redundancy-connect the lower level network to a higher level network. When a communication route of the lower level network is changed, MAC address learning results of the higher level network are cleared to perform switching of communication routes at high speed.

The invention discloses an industrial control network redundancy fault-tolerant system, belonging to the industrial control field. The system of the invention comprises four parts, namely a main controller redundancy system, a slave redundancy system, a fault log system and a host computer monitoring interface, wherein the main controller redundancy system is composed of two main controllers which provide redundancy; each main controller carries a control network to form network redundancy or the two main controllers share one control network; the slave redundancy system is composed of a main controller and a pair of slaves; the main controller monitors the communication condition of the current line and selects the best communication path in real time; the fault log system records the fault message of the device; and the host computer monitoring interface provides communication response for a monitoring computer and processes input operation to control the operation of the redundancy system. The system of the invention can ensure that the resources of the control network of the two redundancies synchronize automatically; the fault can be judged automatically; and when the network has a failure, the network can be switched to a backup control network within 300 milliseconds to operate continuously.

The invention belongs to the technical field of Ethernet communication, in particular relating to a method for realizing redundant ring and network recovery in Ethernet. An Ethernet ring network is formed by a plurality of switches which are connected into a ring physically and are in a chain structure logically. The invention is characterized in that only one of the switches is set to be a master station in charge of controlling the logic structure of network, the other switches are set to be slave stations; the master station and each slave station are provided with two ring ports; the state switching of the ring ports of each switch can realize backup of redundant ring chain, thus realizing network redundancy and recovery. The invention has the beneficial effects of being capable of rapidly detecting chain fault in the ring, building new network topology to recover network in occurrence of fault, realizing backup of redundant ring chain through state switching of ring port of each switchboard; and the invention has simple and effective method and can realize high applicability of industrial control network.

The invention relates to the industrial automation control technology field and relates to a mixed redundancy programmable control system based on equipment redundancy and network redundancy. The mixed redundancy programmable control system comprises a main controller mixed redundancy system and a secondary controller mixed redundancy system, and four levels of redundancy, such as double-Ethernet-equipment redundancy, Ethernet equipment redundancy, double-serial-port serial network redundancy and serial equipment redundancy are included. A main controller is a controller of a double-Ethernet port, four-line mechanism realizes mixed redundancy of the main controller, two switching modes of a normal mode and a rapid mode are provided through matching of an Ethernet mode and an I/O mode, and resource synchronization realizes smooothness of role switching. A secondary controller is a double-serial-port controller, according to a mapping relation between main and secondary equipment, one block of redundancy equipment is added to the secondary equipment, so dual redundancy of a serial communication network and equipment is realized. The mixed redundancy programmable control system is advantaged in that cost is low, four-line mechanism and four levels of redundancy are employed to realize mixed redundancy, reliability is high, and different switching modes satisfy different production technology requirements.

A redundancy method in a network including an upper switch apparatus, middle switch apparatuses connected to the upper switch apparatuses via transmission lines and lower switch apparatuses each being connected to the middle switch apparatuses via transmission lines is provided. In the redundancy method, the upper switch apparatus has link aggregation setting for the transmission lines connected to the middle switch apparatuses, and each lower switch apparatus has link aggregation setting for the transmission lines connected to the middle switch apparatuses, and the upper switch apparatus and one of the lower switch apparatuses switches a traffic route from a transmission line that is failed and that is connected to one of the middle switches to another transmission line for which link aggregation is set with respect to the failed transmission line.

In a network system in which a switch forwarding packets and a control server determining route information are separated, it is desired to achieve a redundancy of the control channel by an out-of-band control channel and an in-band control channel, when the switch receives a control message regarding the flow entry registration and the like based on the route information from the control server. Specifically, the separated switch and control server are connected by a control channel for sending and receiving the control message. The switch is not only connected to a control server via an out-of-band control channel by a route dedicated to the control message, but also connected to another control server via an in-band control channel by a route which is common with a normal data communication for determining the route information, to achieve a redundancy of the control channel.

The invention relates to the field of communication technology and discloses a method and a system achieving network redundancy and data flow seamless switching. The method includes the following steps of using a virtual router redundancy protocol (VTRP) to trigger switching of a first transmitting device to a second switching device according to the changes of links, and using an open shortest path first (OSPF) interior gateway protocol to update route information and to switch the flow direction of the data flow. Main and standby switching is achieved through the use of the VRRP, and when the main and standby states of a VRRP group switch, and the OSPF interior gateway protocol is used for updating the route information and switching the flow direction of the data flow, so that after a linkage mechanism of the VRRP and the OSPF interior gateway protocol is used for achieving the switch, the route information is timely updated, the problem that the data flow direction is wrong and therefore the use of a user is affected is avoided, and the data flow seamless switching is ensured.

The invention discloses a redundancy control method for a locomotive communication network. A locomotive control and monitoring system receives locomotive real-time information sent by electrical equipment of a locomotive; communication tasks between the electrical equipment mainly comprise a main task and an auxiliary task; a vehicle level network communication mode includes MVB communication and Ethernet communication, and a train level network communication mode is WTB communication; and communication network redundancy comprises double-network redundancy and WTB network redundancy. The redundancy control method has the advantages that first-choice communication networks and communication periods of different sets of electrical equipment are set according to tasks executed by the electrical equipment; meanwhile, a loop is formed by an Ethernet switchboard; different sets of equipment respectively communicate with different Ethernet switchboards to realize redundancy of the Ethernet, provide a definition of the double-network redundancy and a definition of the WTB network redundancy; the redundancy efficiency of the locomotive is improved; and furthermore, the demand of the locomotive for two communication periods is met.

The invention relates to a method for realizing dual-network redundancy of a protection device on the basis of PRP parallel redundancy, and belongs to the technical field of relay protection automation in electric power engineering. According to the method, redundancy is realized through a data link layer instead of an application layer, messages are received on two networks and are all transmitted to the data link layer, the data link layer extracts the frame of message received first, drops the repeated frame of the message and then only sends the frame of the message which is obtained after redundancy processing; the application layer only sends one frame of the message in the sending process, and the frame of the message is issued level by level; when reaching the data link layer, the frame of the message is copied, the frame of the message and the copy are sent to the two networks at the same time, and therefore dual redundancy is realized at the data link layer. The method realizes redundancy of network communication of the protection device on the basis of PRP parallel redundancy, is high in processing efficiency, can realize seamless switching and can greatly improve communication quality of the networks of the protection device in a transformer substation.

The invention discloses a network delay measurement method and device and a network node. The method comprises the steps that a source node generates a delay measurement OAM message and records the sending timestamp of the source node in the OAM message when the source node sends the OAM message; when forwarding nodes receive and forward the OAM message, the forwarding nodes record the receiving timestamp and the sending timestamp of the forwarding nodes in the OAM message; and when a destination node receives the OAM message, the destination node records the receiving timestamp of the destination node in the OAM message and obtains the delay of each link, the delay of each forwarding node and the overall path delay through calculation according to the timestamp information, recorded in the OAM message, of all the nodes. According to the method and device, peer-to-peer delay measurement and end-to-end delay measurement are completed at a time, end-to-end delay measurement abnormities brought by network redundancy protection are avoided, and the error accumulation effect brought by multi-time and multi-segment measurement is avoided, so that the delay measurement precision is improved.

The invention belongs to the technical field of computed tomography image processing. According to the specific technical scheme, the CT image super-resolution reconstruction method based on the generative adversarial network comprises the following specific steps: 1, establishing a dense connection relationship among different residual blocks based on a multi-stage dense residual block generatornetwork; 2, adding a bottleneck layer to the front end of each dense residual block; 3, optimizing the global network by adopting the Wasserstein distance loss and the VGG feature matching loss; 4, arranging a multi-path generator based on the sequence from thick to thin; 5, generating an image based on conditional expression generative adversarial learning; 6, reconstructing a CT image super-resolution reconstruction framework of the generative adversarial network based on multiple paths of conditions from coarse to fine; 7, reconstructing a loss function. According to the method, network redundancy is reduced, feature multiplexing among different residual blocks is realized, the maximum information transmission of the network is realized, the feature utilization rate is improved, and thereconstructed image quality is greatly improved.

A receiving network node (210) configured to select from received packets differing by time of initial transmission from a sending network node (230), and accepting for transmission, based on initial transmission time, the selected packets to an application layer (740). An internet-worked processor node configured to: (a) read a sequence number and an originator identifier of a received packet message (810); (b) compare a stored highest sequence number associated with the originator identifier with the received packet sequence number (820); (c) if the received packet sequence number is less than or equal to the stored highest sequence number associated with the originator identifier, then discard (840) the received packet; and (d) if the received packet sequence number is greater than the stored highest sequence number associated with the originator identifier, then deliver (860) the message of the received packet to an application based on an upper layer protocol.

A system and method are disclosed for providing redundancy for telecommunication switches. A primary telecom switch has an active processing board and a passive I/O board for communicating with external sources, such as a control network and bearer traffic network. A redundant secondary telecom switch has an active processing board and a passive I/O board for communicating with a control network, and is connected to the I/O board of the primary switch through a redundancy connection for communicating with the bearer traffic network. According to the invention, the secondary telecom switch assumes the role of the primary telecom switch in the event that the primary processing board becomes unavailable. The secondary telecom switch then communicates with the bearer traffic network as the master switch through the redundancy connection and the I/O board of the primary switch, thus avoiding the necessity for reconnections and reconfiguration.

The invention discloses a marine petroleum drilling machine integrated network redundancy monitoring system which comprises a 'three-network four-layer' network structure. Three control consoles are connected with a fault-tolerant server and respectively connected with PLC corresponding to three control consoles. A fault-tolerant database server, a central control room IPC, a captain room IPC, a manager room IPC and an engineer IPC are connected with networks NET1 and NET2, the captain room IPC, the manager room IPC, the engineer IPC, a fault-tolerant data server and a fault-tolerant server are connected with networks NET3 and NET4, the fault-tolerant server and the PLC corresponding to three control consoles are connected with networks NET5 and NET6, and the fault-tolerant data server, the PLC corresponding to three control consoles and multiple locally controlled PLC substations are connected with networks NET7 and NET8. The marine petroleum drilling machine integrated network redundancy monitoring system achieves control system networking, is good in real-timeliness and high in reliability and usability, improves the well drilling operation efficiency, convenient to operate, control, expand, remove and maintain and reduces economic loss caused by accidental shutdown.

The invention discloses an ARM and FPGA (Field Programmable Gate Array) based ship power positioning control system which comprises a main control computer, a collecting module, a console controller and a propeller, wherein the main control computer, the collecting module and the console controller are connected with each other through a first network; the console controller is also connected with a second network; the console controller and the propeller are connected with each other through the second network; the collecting module is used for transmitting sensor data and propeller data to the main control computer; the main control computer is used for calculating a ship position according to the sensor data and calculating a propellant volume according to the propeller data; the console controller is used for reading practical operation information on a console and the propellant volume of the propeller, reading the state of the propeller and feeding back to the main control computer. The system disclosed by the invention is rich in hardware interfaces and industrial bus protocols, can meet the requirements of node redundancy and network redundancy, is high in communication efficiency and is high in system response speed.

The invention discloses a protocol-independent network redundant flow eliminating method. According to the method, a certain number of data packets are grabbed from a network in advance, the data packets are grouped according to the magnitudes of loads, statistics of the data size cumulative probability of grouping is conducted, a corresponding load threshold value is determined, and a sending end conducts redundant flow elimination on the data packet the load of which is larger than the load threshold value; the loads are partitioned according to the weak Hash values, the strong Hash value of each data block is taken as a fingerprint to be matched with a fingerprint in a fingerprint base, the fingerprint which is not matched with the fingerprint in the fingerprint base and the corresponding data block are updated to the fingerprint base and a data block base, the sending end takes the initial positions of all the data blocks in the data packets and the positions of all the data blocks in the data block base as loads to regenerate data packets and sends the data packets to a receiving end, and the receiving end conducts recovery on the data packets after receiving the data block information in the data packets. The method is used for processing redundant data among the data packets without being affected by the application layer communication protocol and has a good redundant flow elimination effect and a good processing time effect.