Class / Patent application number | Description | Number of patent applications / Date published |
370223000 | Using a secondary ring or loop | 44 |
20080285440 | Mesh with protection channel access (MPCA) - A method for a communications network with a protect channel transmitting protect channel data and working channel transmitting working channel data includes transmitting the working channel data via the protect channel upon a disruption in the working channel, and restoring the transmitting of protect channel data, wherein the restoring includes applying a mesh restoration protocol to the communications network to restore the transmittal of the protect channel data. The restoring includes finding one or more alternate channels to transmit the protect channel data, the one or more alternate channels including connected working and protect channels. An apparatus disposed in a communication network having a protect channel and a working channel includes a node controller, a route processor coupled to the node controller, the route processor implementing a mesh restoration protocol, and a circuit coupled to the node controller and the route processor, the circuit including a logic gate for receiving signals identifying disruptions in transmissions in the protect channel and the working channel and a switch responsive to the signals identifying disruptions in transmissions in the protect channel and the working channel, the switch communicating with the route processor to implement mesh restoration of protect channel data. In one embodiment, the circuit is coupled to at least one line card, the line card transmitting the signals identifying disruptions in transmissions in the protect channel and the working channel. The circuit further includes an input/output circuit for receiving instructions identifying criteria for applying mesh restoration to protect channel data. | 11-20-2008 |
20080298231 | Ring node and redundancy method - To provide a technology capable of improving fault-tolerance by redundancy-structuring each of ring nodes building up a ring network with an active termination block and a non-active termination block and, if a fault occurs in the active termination block, continuing an operation by switchover to the non-active termination block. A ring node is configured such that data from a terminal side is forwarded to an active termination block and to a non-active termination block, source information of the data is determined and registered in a database, the data is transmitted to the ring from a ring-side interface, the data received from the ring is forwarded to the active termination block and to the non-active termination block, destination information of the data is determined by referring to the database and forwarded to a terminal-side interface, and the terminal-side interface selects the data from the active termination block and forwards the selected data to the terminal side. | 12-04-2008 |
20080316918 | PACKET RING NETWORK SYSTEM AND PACKET TRANSPORT METHOD - The present invention can reestablish a communication path between two packet ring networks through another packet ring network even if a fault occurs therebetween and can prevent occurrence of broadcast storm or the like. Therefore, a packet ring network system of the present invention includes a plurality of packet ring networks to which nodes are brought into ring form connection so that a packet inside a ring obtained by encapsulating a client packet, which a terminal outside the packet ring network transmits, is transmitted and received in a packet ring network, wherein, a first packet ring network is included; a plurality of subpacket ring networks connected to the first packet ring network through an interlink used for client packet transport therebetween is included; the interlink is provided to each of the subpacket ring networks connected to the first packet ring network; the first packet ring network and each of the subpacket ring networks include an interlink node connected to an interlink; each of the subpacket ring networks is connected to another subpacket ring network through a bypass pathway used for client packet transport when a fault occurs in an interlink; each of the subpacket ring networks includes a bypass pathway node connected to a bypass pathway to another subpacket ring network, and the bypass pathway node starts transport of a client packet with a bypass pathway in the case where a fault occurs in an interlink between a subpacket ring network to which a self-node belongs and a first packet ring network or in an interlink between a subpacket ring network to which a bypass pathway node connected to the self-node through a bypass pathway belongs and the first packet ring network. | 12-25-2008 |
20080316919 | TRUNK INTERFACE IN RESILIENT PACKET RING, METHOD AND APPARATUS FOR REALIZING THE TRUNK INTERFACE - A trunk interface in Resilient Packet Ring (RPR) is provided and a method and an apparatus for implementing interface trunking in RPR with a plurality of stations, where at least one of the stations includes a plurality of RPR interfaces. A plurality of physical link ports in an RPR interface are combined into a logical link port, so as to implement logical combination of a plurality of first physical link. A trunk interface is formed with the combined logical link ports, and a logical address is assigned to the trunk interface. Furthermore, the communication traffic of the stations may be apportioned among the physical link ports, so as to provide link balance. The physical links are provided on different rings. When any fault occurs, a new ring may be formed so as to make the communication link unblocked. With the present invention, the interface bandwidth is increased, the address (MAC address/IP address) resources are saved and the interface (link) reliability is increased. | 12-25-2008 |
20090003199 | Packet network system - A system enabling inter-ring network connection when a plurality of ring networks are connected via a redundancy network, that is, a packet network system configured by a plurality of ring networks and redundancy networks linking the plurality of ring networks. This system virtually defines a plurality of virtual resilient packet ring networks among all of these packet networks and transfers packets on a designated virtual resilient packet ring network. Here, each virtual resilient packet ring network is identified by a virtual resilient packet ring network identifier allocated to each. | 01-01-2009 |
20090022052 | COUNTER MULTI-FAILURE SYSTEM AND COMMON LINK TERMINAL DEVICE USED THEREIN - In a communication network including a monitor device, a relay device, and a common link terminal device, in response to detection of a link failure in a ring, each device sends a failure detection frame to the ring and causes link failure information to reach the common link terminal device. The common link terminal device generates a link failure information management database, performs a multi-failure detection process, and stops transmission of an auxiliary monitor frame upon detection of multiple failures. | 01-22-2009 |
20090052317 | Ring Network System, Failure Recovery Method, Failure Detection Method, Node and Program for Node - In a multi-ring network with a plurality of rings to which RPR is applied connected, high-speed failure recovery is enabled when a failure occurs between the rings. The contact nodes | 02-26-2009 |
20090122695 | METHOD, APPARATUS AND COMPUTER PROGRAM PRODUCT FOR REDUNDANT RING COMMUNICATION - Sets of communication modules each have a pair of ring-channel ports for a ring-configured channel in a network, a peripheral device port for peripheral device data, and dual-ring ports for an inter-ring channel for the pair of modules. First and second ones of a set of communication modules send duplicate data packets on their respective first and second rings. Responsive to duplicate data packets arriving via the rings at first and second modules in a next set within a predetermined time interval of one another, each of the next modules transmits its ring-channel received data packet out a downstream ring-channel port. Responsive to one of the duplicate packets arriving at the DRP of a module a predetermined time interval before arriving at a ring-channel port of the module, the module sends the corresponding packet received at the DRP out its other ring-channel port and its peripheral device port. | 05-14-2009 |
20090141621 | BANDWIDTH RESERVATION REUSE IN DYNAMICALLY ALLOCATED RING PROTECTION AND RESTORATION TECHNIQUE - The disclosed network includes two rings, wherein a first ring transmits data in a clockwise direction, and the other ring transmits data in a counterclockwise direction. The traffic is removed from the ring by the destination node. During normal operations (i.e., all spans operational), data between nodes can flow on either ring. Thus, both rings are fully utilized during normal operations. The nodes periodically test the bit error rate of the links (or the error rate is constantly calculated) to detect a fault in one of the links. The detection of such a fault sends a broadcast signal to all nodes to reconfigure a routing table within the node so as to identify the optimum routing of source traffic to the destination node after the fault. | 06-04-2009 |
20090196171 | SHORTENING OF COMMUNICATION CUTOFF TIME - A topological information management frame is classified based on the contents stored in the topological information management frame, and information stored in a database is updated based on the contents stored in the topological information management frame depending on the classification of the topological information management frame. | 08-06-2009 |
20090219808 | LAYER-2 RING NETWORK SYSTEM AND MANAGEMENT METHOD THEREFOR - Disclosed is a ring network in which ring domains are managed in ring forms, layer | 09-03-2009 |
20090310481 | METHOD AND DEVICE OF NETWORK PROTECTION - A method and a device of network protection are disclosed to protect transmission of the PBT service when a link or node fails in the PBT network. The method comprises: switching a Provider Backbone Transport (PBT) service impacted by a fault to a protection Provider Backbone Bridge (PBB) service according to a preconfigured corresponding relationship between the PBT service and the protection PBB service when a working link or a working node fails in a ring network; and forwarding a service frame of the protection PBB service in a PBB service forwarding mode. A network device for implementing such a method is also disclosed. The technical solution under the present disclosure enables simultaneous transmission of both the PBT service and the PBB service in the same network, requires use of only one protection technology, and draws upon the traditional Ethernet protection technology to protect the PBT service. | 12-17-2009 |
20090323518 | Ring rapid spanning tree protocol - In a method for enabling facilitation of re-convergence, designation information for a first port of each one of a plurality of bridges in a multi-bridge ring is received and designation information for a second port of each one of a plurality of bridges in a multi-bridge ring is received. The first port of each one of a plurality of bridges is a first direction Ring Rapid Spanning Tree Protocol (RRSTP) port and the second port of each one of a plurality of bridges is a second direction RRSTP port. The first direction around the ring (e.g., a forward direction) is opposite the second direction around said ring (e.g., a backward direction). A first reserved RRSTP MAC address is associated with the first direction port of each one of the bridges and a second reserved MAC address is associated with the second direction port of each one of the bridges. | 12-31-2009 |
20100014417 | METHOD AND APPARATUS OF RING NETWORK PROTECTION - A method of ring network protection is provided. A node in a ring network determines a section that suffers a fault and determines a timeslot of a service impacted by the fault on the node according to section ring formation information and service route information preconfigured on the node when trigger conditions of protection switching are fulfilled, and switches the service onto a protection channel that bypasses the section that suffers the fault, where: the section ring formation information lists the information about the sections included in a ring consecutively in a preset direction; and the information about the sections includes preassigned IDs of sections between adjacent nodes in the ring network; and the service route information lists the information about the trails that use the node as a source node and a sink node of the service in each specific timeslot. A network element device is also provided. The provided method and network element may shorten the service switching time, and improves the signal quality after switching. | 01-21-2010 |
20100135154 | METHOD AND SYSTEM FOR PROTECTION SWITCHING IN ETHERNET RING - A method and system for protection switching in Ethernet rings are disclosed. The method for protection switching in Ethernet rings includes: receiving a server signal fail (SSF), an Ethernet lower layer fault signal, a remote defect indication (RDI) for informing a different port about a fault state when a uni-directional fault is generated, and ring-automatic protection switching (R-APS) information for requesting Ethernet ring protection switching; comparing the SSF, the RDI, and the R-APS information, and setting states of the first and second Ethernet rings; determining a protection switching priority level of each of the first and second Ethernet rings according to the states of the first and second Ethernet rings; and performing protection switching on the first and second Ethernet rings according to their protection switching priority levels. | 06-03-2010 |
20100260040 | ETHERNET RING SYSTEM AND A MASTER NODE AND AN INITIALIZATION METHOD THEREOF - The present invention provides an Ethernet ring system and the master node and the initialization method thereof, comprising the following steps: Step | 10-14-2010 |
20110019536 | METHOD FOR MANAGING ETHERNET RING NETWORK OF VLAN-BASED BRIDGE - There is provided a method for managing an Ethernet ring network of a VLAN-based bridge that includes: registering a major-ring VID (VLAN ID) in a ring port filtering database of a ring protection link owner node in accordance with a request for registering the major ring VID (VLAN ID) from an ERP (Ethernet Ring Protection) controller mounted on the ring protection link owner node of a major ring; delivering, by the ring protection link owner node, a VID registration message to other nodes which belong to the major ring through a ring port; receiving the VID registration message through the ring port and registering the major ring VID in a ring port filtering database of each node itself, by each node which belongs to the major ring; and delivering, by each node which belongs to the major ring, the VID registration message to other nodes which belong to the major ring through the ring port. | 01-27-2011 |
20110044166 | METHOD FOR OPERATING NODE IN ETHERNET RING NETWORK - A ring protection link (RPL) owner node in a ring network transmits a ring-automatic protection switching (R-APS) frame in a burst mode until blocked ports of all nodes except the RPL owner node have been unblocked, and, if it is determined that all the nodes have been unblocked, transmits the R-APS frame in a continuous mode. In this manner, the time required to unblock all the nodes can be reduced. | 02-24-2011 |
20110116365 | METHOD AND A SYSTEM FOR PREVENTING A NETWORK STORM FROM PRESENTING IN A MULTI-RING ETHERNET - A method and a system for preventing a network storm from presenting in a multi-ring Ethernet, the method comprises: when a link in the multi-ring Ethernet is failed, at most one ring protecting link is unblocked, the ring protecting link and the failed link being in a same logic area. Wherein each link in the multi-ring Ethernet belongs uniquely to one logic area, when a link in the multi-ring Ethernet is failed, a master node of a logic area to which the failed link belongs unblocks a ring protecting link; or each link in the multi-ring Ethernet respectively belongs to one or more logic areas, each logic area is set with a priority, when a link in the multi-ring Ethernet is failed, the ring protecting link of one logic area which contains the failed link and has a highest priority is unblocked by the master node of the logic area. | 05-19-2011 |
20110122764 | Cross-layer reconfiguration method for surviving multiple-link network failures - A second link in a network is reconfigured after failure of a first link, so that multiple-link failures may be survived. After receipt of an OSPF link state advertisement (LSA) indicating use of a backup path b | 05-26-2011 |
20110261681 | METHOD AND DEVICE FOR PROTECTING MULTI-RING ETHERNET - The invention discloses a method and a device for protecting a multi-ring Ethernet, wherein the method comprises: the multi-ring Ethernet is divided into multiple subsets without public links thereamong; each subset controls its own protection switch; when a public link in the multi-ring Ethernet is failed, only the subset to which the public link belongs executes the protection switch and other subsets do not execute the protection switch. Therefore, during the protection switch, a new ring which causes a network storm is not generated. The advantages of the invention comprises: realizing the protection of the multi-ring Ethernet, the protection of the multi-ring Ethernet is simple to operate, and the efficiency of the protection switch of the multi-ring Ethernet is high. | 10-27-2011 |
20120314565 | METHOD FOR PROTECTION AGAINST SUPERLOOPS IN AN ETHERNET RING - The present invention relates to a method in an interface node for protecting an Ethernet ring from a superloop going through the Ethernet ring, wherein the Ethernet ring comprises a pair of interface nodes between the Ethernet ring and a VPLS-domain, the method comprising the steps of: receiving in the interface node a priority message indicating a priority level for each Ethernet ring connected to the VPLS-domain; receiving in the interface node a withdrawal message intended to indicate that the other interface node is malfunctioning; and transmitting from the interface node a signal failure message to the Ethernet ring in a case any other Ethernet rings has a lower priority level than said Ethernet ring. | 12-13-2012 |
20130044588 | INTERCONNECT TOPOLOGY WITH REDUCED IMPLEMENTATION REQUIREMENTS - A topology for routing message traffic between interconnecting nodes of a network is provided that includes a plurality of rings having a plurality of interconnecting nodes. A number of trees include at least one leaf at a same relative position of the rings. The trees and the rings form a unique combination that provides superior network performance for moderate numbers of the interconnecting nodes, wherein each interconnecting node has only a limited ability to handle a plurality of links. | 02-21-2013 |
20130064070 | APPARATUS AND METHOD FOR IDENTIFYING OPTIMAL NODE PLACEMENT TO FORM REDUNDANT PATHS AROUND CRITICAL NODES AND CRITICAL LINKS IN A MULTI-HOP NETWORK - A method includes obtaining information identifying one or more critical nodes and/or one or more critical links in a multi-hop network. Each critical node or critical link represents a node or link whose failure isolates at least part of the network. The method also includes generating a list identifying one or more orphaned nodes that lose connectivity to a gateway when a specified critical node or critical link fails. The list is generated using an Eigenvector of a matrix defining a topology of the network without the specified critical node or critical link. The method further includes identifying, using the list, at least one location where an additional node can be inserted into the network in order to reduce a number of is critical nodes and critical links in the network. The gateway and the orphaned node(s) can be associated with different values in the Eigenvector. | 03-14-2013 |
20130064071 | RING NODE, AN ETHERNET RING AND METHODS FOR LOOP PROTECTION IN AN ETHERNET RING - According to embodiments of the invention, a first ring node is arranged to protect against loops in an Ethernet ring by performing Ethernet ring protection (ERP) according to an Ethernet ring protection protocol (ERP) standard. The first ring node is located directly adjacent to at least one second ring node in the Ethernet ring which is not configured to perform ERP according to the same ERP protocol standard. The first ring node is configured to, upon detection of a link failure or recovery event in the Ethernet ring resulting in a flush operation of the filtering database (FDB) in the first ring node in accordance with the ERP protocol standard, send a message to the at least one second ring node which is operable to cause said at least one second ring node to perform a flush operation of its filtering database (FDB). Embodiments of the invention also include an Ethernet ring, a broadband communications network and methods for use in the first ring node and in the Ethernet ring. | 03-14-2013 |
20130170337 | Verifying Communication Redundancy in a Network - Apparatuses, methods, and computer-readable media support diagnosing a communications network using a network protocol that ensures a loop-free topology to prevent bridge loops. One of the network devices is identified as a selected device in a network ring, where the selected device interacts with the network ring through first and second ports. The values of some of the parameters of the selected device are modified to be distinguishable from that of any network device in the ring, and diagnostics about the functioning of the network protocol are then performed to obtain state information about the first and second ports. When one of the ports is determined to be in the blocking state, network redundancy for the network ring is verified. However, when neither of the ports is not in the blocking state, a redundancy problem may be detected. | 07-04-2013 |
20130194913 | METHOD, APPARATUS AND SYSTEM FOR INTERCONNECTED RING PROTECTION - A method, an apparatus and a system for interconnected ring protection, relates to the communication field, realizes the protection of the interconnected ring network using a narrow bandwidth, and improves the bandwidth utilization rate. The method comprises: a first intersection node in an intersection node group receiving an cross-ring service, the first intersection node determining an off-ring node of the cross-ring service on a second ring according to service information of the cross-ring service; and if the first intersection node does not communicate with the off-ring node of the cross-ring service on the second ring, and the first intersection node is not the last intersection node, the first intersection node forwarding the cross-ring service to a second intersection node. | 08-01-2013 |
20130279322 | Hardware Based Convergence for a Ring Network - In accordance with an example embodiment, there is disclosed herein, an apparatus having first and second interfaces for communicating on a ring network. Upon receipt of a first signal on the first interface indicating a break in the ring, the apparatus stops forwarding packets onto the ring. Upon receipt of a second signal on the second port indicating a break in the ring, the apparatus forwards all packets destined for the ring network onto the ring network via both the first and second interfaces. | 10-24-2013 |
20140064061 | MAC FLUSH OPTIMIZATIONS FOR ETHERNET RINGS - Techniques are identified for optimizing the MAC flush in Ethernet rings for faster traffic restoration. In one embodiment, flushing of MAC addresses is performed only once on receiving a first control message. For example, when a first control message is received, a network device may switch from a first state to a second state, which may indicate that the MAC addresses are not to be flushed if additional control messages are received. In another embodiment, flushing of MAC addresses is performed on one ring port rather than on both ring ports. For example, a flag field of a control message header may be used to determine on which port to flush. In another embodiment, flushing of MAC addresses is performed on only one ring port of an interconnection node. For example, the ring port can be determined using a flag field and possibly labels associated with the ring ports. | 03-06-2014 |
20140071812 | BACKUP SYSTEM OF RING NETWORK AND BACKUP METHOD OF RING NETWORK - A backup system of a ring network and a backup method of a ring network are provided. The backup system of a ring network includes a plurality of switches. Each switch includes two main connection ports and two redundant connection ports. One of the two main connection ports of each switch is connected to one of the two main connection ports of an adjacent switch via a main link, and one of the two redundant connection ports of each switch is connected to one of the redundant connection ports of an adjacent switch via a redundant link. The main links are preset to be in a work state, and the redundant links are preset to be in a backup state. When one of the main links is faulty, the redundant link corresponding to the faulty main link is converted to be in the work state. | 03-13-2014 |
20140169155 | Packet Processing Method and System - Embodiments of the present invention disclose a packet processing method and system. In the method in the embodiment of the present invention, because a root node configures different control VLANs for any two rings that have an adjacent edge in an area, different control VLANs are used to transmit a protocol packet in a ring that has its own control VLAN configured. The method and system may be applied to a ring network of a metro Ethernet to provide multi-path protection and implement rapid convergence of service switchover. In addition, a network topology structure is not limited to a network topology with a single ring or only two intersecting points, and may be applied to all network topology situations. | 06-19-2014 |
20140185427 | DUAL-RING SWITCH FOR RSTP NETWORKS - A dual-ring computer network architecture for industrial automation systems includes a dual-ring switch for interconnecting two networks, such as Rapid Spanning Tree Protocol (RSTP) networks. The dual-ring switch may provide separate control planes between the two networks but a common data plane between the networks. The system topology may include a main ring and a sub-ring, which creates separate fault regions for isolation. Using this configuration, the standard RSTP practical limit of 32 devices is no longer a limit, as the use of the dual-ring switch provides a mechanism to expand the total number of devices up to 256 while maintaining the network recovery time to within a target of 50 milliseconds. This allows for the use of dual rings using the RSTP protocol on a single switch. In another embodiment, two dual-ring switches are configured in the same sub-ring for redundancy. | 07-03-2014 |
20140362683 | PARALLEL OPERATION OF RSTP AND MRP AND SEGMENTATION COUPLING - At least two different redundancy protocols are operated in parallel by network devices in an Ethernet network. Control is determined and assigned to one of two protocols to have total control over which ports in the network devices are active and which are blocked for transmission of user data and network data network traffic while allowing all control and monitor traffic to traverse the ring of network devices. Control and monitoring packets are transmitted by RSTP packets through all of the network devices in the ring while restricting the data ports of the network devices to transmit user data and data network traffic to the network devices connected in the line of the network devices. Parameters received in RSTP packets are collected from all of the network devices in the ring in order to determine which network device of the network devices is a virtual root bridge. | 12-11-2014 |
20150036483 | APPARATUS AND METHODS FOR INTELLIGENT DEPLOYMENT OF NETWORK INFRASTRUCTURE BASED ON TUNNELING OF ETHERNET RING PROTECTION - Apparatus and methods for intelligent deployment and transition from a first network infrastructure to a second network infrastructure. Various embodiments of the present disclosure are directed to, among other things, methods and apparatus that leverage tunneling of Ethernet ring network technologies. In one exemplary embodiment, a modified implementation of the ITU-T G.8032 data link protocol is combined with Multiprotocol Label Switching (MPLS) transport networks to provide Carrier Ethernet and Retail Ethernet services. Unlike existing network infrastructure, the exemplary MPLS network aggregates traffic between the base station (BS) and mobile switching center (MSC) within a logical ring network topology. | 02-05-2015 |
20150085641 | NETWORK STATUS VISUALIZATION SYSTEMS AND METHODS - Systems and methods are disclosed for visualizing a point to multi-point network, such as a network including Ethernet Ring Protection (ERP) using a visualization techniques used for point-to-point networks. For example, for a selected start and end node, intervening nodes may be identified and any protection rings also identified. A blocking port for each ring is identified and based thereon a path through the ring is identified. A trail between the start and end node is then generated using the current path through the protection rings. The trail may then be represented graphically. Unblocking of a blocked port of a ring may be detected and a new path through the ring may be determined and represented graphically. Status indicators may be included in the updated representation of the ring to indicate the presence of a failure condition. | 03-26-2015 |
20150138950 | Redundant Network Implementation Method - Disclosed is a method of implementing a redundant network. Ring network nodes in an initial state are set as master stations, ring ports are set in a half-blocked state, a master station election notification message is broadcast to the ring ports within a preset time interval, the nodes receive the master station election notification message, a node quality comparison vector is compared with node quality comparison vectors of the nodes to elect a master and standby stations, one of the ring ports is in the half-blocked state, the other ring ports are in a forwarding state, the master station broadcasts the master station election notification message to the ring ports, the standby master station stops sending the master station election notification message, the ring ports are in the forwarding state, and the message sent by the master station is received. | 05-21-2015 |
20150296394 | METHOD AND APPARATUS FOR A MODIFIED OUTER LOOP AFTER A RECEIVER OUTAGE EVENT - A method, system and non transitory, tangible computer readable storage medium provides for controlling the BLER (block error rate) in a digital communication system. The outer loop control of the system discounts responses sent by a receiver to data transmission from a transmitter that were sent during a receiver outage event. Either the NACKs or both the ACKs and NACKs sent by the receiver during receiver outage are discounted by the outer loop control which adapts subsequent transmissions by either directly adjusting transmission parameters or by adjusting the selection of transmission parameters. The adapting may be based on individual NACKs and ACKs or after establishing a BLER. | 10-15-2015 |
20160142225 | COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, AND PROTECTION METHOD - A communication system includes two or more ring networks in which nodes are connected in a ring shape, carries out ERP for each of the ring networks, sets one of the ring networks as a major ring that detects a failure in a shared link, and sets the other ring networks as sub rings. A shared node, which terminates the shared link, includes: a failure monitoring unit that respectively detects, concerning two or more of the ring networks that share the shared link, failures in the ring networks; a switching processing unit that determines, on the basis of a detection result of the failures, the ring network set as the major ring; and ERP processing units that store, when the switching is performed by the switching processing unit, identification information after the switching in an R-APS frame and transfer or transmit the frame. | 05-19-2016 |
20160197741 | ETHERNET RING PROTECTION NODE WITH NODE-LEVEL REDUNDANCY | 07-07-2016 |
370224000 | Loopback of signals on the secondary ring or loop | 5 |
20090040922 | EFFICIENT PROTECTION MECHANISMS IN A RING TOPOLOGY NETWORK UTILIZING LABEL SWITCHING PROTOCOLS - Efficient protection mechanisms for ring based label-switching networks are designed to protect point-to-point label switching paths (LSPs) while preventing misconnection and mismerge situations. The protection switching is performed by nodes adjacent to the point of failure. The switching decision is based on a locally detected signal fail condition. The operation of the protection mechanisms does not require the use of any protection switching protocol. In one embodiment of the present invention, the protection is achieved by assigning an exclusive label to each LSP. In another embodiment, the protection is achieved by providing a closed-loop protection tunnel and assigning a tunnel label for each such protection tunnel. In yet another embodiment, the protection is achieved by establishing a mirror path for each protected LSP. | 02-12-2009 |
20110007628 | COMMUNICATION PATH PROVIDING METHOD AND COMMUNICATION APPARATUS - A method provides a communication path in a ring network having a plurality of communication nodes. The method includes: setting transfer information of data in each of the plurality of communication nodes by making the transfer information correspond to connection information for identifying a connection within the ring network to provide a first communication path; determining whether to update the transfer information in each of the communication nodes according to the position where the fault occurs; and updating the transfer information according to the position where the fault occurs in one or more of communication nodes to provide a second communication path. Each of the plurality of communication nodes transfers input data by using the first or second communication path according to transfer information corresponding to connection information attached to the input data. | 01-13-2011 |
20110063971 | Data relay apparatus, and ring-type communication system - A data relay apparatus for data relay in a ring-type network for data including a path identifier which is transferred according to the path identifier, receives the data; stores the path identifier that is used to determine a data path in which the data is transferred in the ring-type communication network in association with a reception direction and a transmission direction of the data; compares the path identifier included in the received data and the path identifier stored by an information storing part to determine a path for receiving and transmitting the data and switches the transmission direction of the data based on a reception direction of a failure notification message notified when a communication failure occurs and whether a switching inhibition message transmitted concerning the communication failure is received; and transmits the data in the switched transmission direction. | 03-17-2011 |
20130114400 | ETHERNET LOOP LOCATING METHOD, SWITCHING DEVICE AND SYSTEM - The embodiments of the present disclosure relate to the field of communications and provide an Ethernet loop locating method, a switching device, and a system to locate loop fault ports precisely. The switching device receives an Ethernet frame, learns a MAC address according to a source MAC address of the Ethernet frame, and determines a learned associated port of the MAC address as a first port of the MAC address; uses a port after hopping as a second port of the MAC address when the learned associated port of the MAC address undergoes hopping for a first time after the MAC address is learned; and determines the second port as a loop fault port if the total number of hops of the learned associated port of the MAC address in a specified time is greater than or equal to a preset threshold. | 05-09-2013 |
20160173296 | NETWORK MONITORING METHOD, RELAY DEVICE, AND NETWORK MONITORING SYSTEM | 06-16-2016 |