| Entries |
| Document | Title | Date |
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| 20080219149 | Flushing processing unit and method of switching device in network using spanning tree protocol - A flushing processing unit and method of a switching device in a network using Spanning Tree Protocol (STP). The method includes determining, by a switching device, whether there is a failure link; when there is the failure link, determining, by the switching device, which one of a root port and a designated port connects to the failure link; when it is determined that the root port connects to the failure link, changing, by the switching device, a filtering database and changing port information of a host address registered to the root port into preset alternate port information; and sending, by the switching device, a Transmission Control Protocol (TCP) message through an alternate port. | 09-11-2008 |
| 20080225697 | Computing repair path information - An apparatus and method is described for computing repair path information around a failure component in a data communications network having a components nodes and links therebetween. Where, according to a routing protocol, a node sends to a neighbor node a metric indicative of reachability of a destination node, the protocol requiring differentiated action by the node if the route to the destination node includes the neighbor node, the apparatus is arranged to compute a repair path to the destination node via candidate nodes comprising only neighbor nodes to the apparatus not requiring differentiated action relative to the apparatus. | 09-18-2008 |
| 20080239945 | PERIPHERAL COMPONENT SWITCH HAVING AUTOMATIC LINK FAILOVER - Disclosed are a PCI switch assembly, having automatic link failover, and a computer system including that switch assembly. The switch assembly comprises first and second interconnected, peripheral component switches. Each of the these switches has first and second primary ports and a plurality of secondary ports. The switch assembly has a normal mode and a failover mode. In the normal mode, each switch routes data through the switch to the secondary ports of the switch. In the failover mode, a failover path is defined and data are routed from the first switch to the second switch and then to one of the secondary ports of the second switch. The second switch detects a predefined fail condition, and changes the switch assembly from the normal mode to the failover mode in response to detecting the predefined fail condition. | 10-02-2008 |
| 20080239946 | Communication system, switch - According to an aspect of an embodiment, a communication system comprises: a. a first information processing device; b. a first communication line and a first backup line connected to the first information processing device, respectively; c. a second information processing device; d. a second communication line and second backup line connected to the second information processing device, respectively; e. a first switch comprising: a first port connected to the first communication line; a second port connected to the second backup line; and a controller for performing of: detecting a failure of the first port; switching the second backup line; and sending a notification; and f. a second switch comprising: a third port connected to the first backup line; a fourth port connected to the second communication line; and a controller for performing of: receiving the notification; switching the first backup line and the second communication line. | 10-02-2008 |
| 20080247308 | PROVIDING SESSION REDUNDANCY USING PRIORITY DURING A SYNCING PROCESS - In one embodiment, sessions are synced from an active device to a standby device according to a priority. One or more attributes are determined for a plurality of sessions that need to be synced between an active device and a standby device. The attributes may be used to determine a value of syncing a session. A priority for syncing the sessions based on the attributes is then determined. The sessions are then synced based on the priority. For example, a portion of sessions considered to be of a higher priority may be synced before a portion of sessions considered to be of a lower priority. Because the sessions considered of a higher priority are synced first, if a double failure occurs where the active device fails during the syncing process, at least the higher priority sessions have been synced with the standby device and the standby device can take over these sessions. | 10-09-2008 |
| 20080259785 | Link Adaptation - The present invention discloses an apparatus and method for adapting a transmission parameter in a transmitting node of a data communication system to the current link quality of a data communication channel. The adapted transmission parameter is selected by the transmitting node from a set of transmission parameters in dependence on a number of successful transmissions. The number of successful transmissions is compared in the transmitting node against one of a first threshold value corresponding to a first state of the transmitting node and a second threshold value corresponding to a second state of the transmitting node. The method comprises in the transmitting node the steps of (a) counting the number of successful transmissions; (b) selecting the adapted transmission parameter (b | 10-23-2008 |
| 20080279094 | Switching System And Method For Improving Switching Bandwidth - A switching system compatible with ATCA/ATCA 300 architecture and a method for improving switching bandwidth, including: a backplane, a plurality of node boards and at least two hub boards; the node boards are connected with the hub nodes through the backplane; each node board is connected with the at least two hub boards; different data is transmitted on at least two data links between the node boards and the at least two hub boards, and the at least two hub boards cooperate with each other to implement a data switching between the node boards. | 11-13-2008 |
| 20080285435 | INTELLIGENT FAILBACK IN A LOAD-BALANCED NETWORKING ENVIRONMENT - One embodiment of the present invention sets forth a method for failing back network connections to a network interface card (NIC) within a computing device. The method includes the steps of monitoring a failed or unreliable NIC within the computing device, determining that the failed or unreliable NIC has recovered, determining that a functional NIC within the computing device is overloaded, selecting a first connection set communicating through the overloaded NIC, and transferring the first connection set to the recovered NIC. With this approach, intelligent decisions can be advantageously made regarding whether to fail back a network connection set to a recovered NIC based on the traffic loads on the overloaded NIC and the recovered NIC. Such an approach to balancing network traffic across the functional NICs within a computing device may substantially improve overall performance relative to prior art techniques. | 11-20-2008 |
| 20080285436 | Methods, systems, and computer program products for providing site redundancy in a geo-diverse communications network - Methods, systems, and computer program products for providing an enriched messaging service in a communications network is described. In one embodiment, the system includes a first host operating in an active state at a first site in a communications network and a second host operating in a standby state at a second site in the communications network. The system also includes a first proxy located at the second site, wherein the first proxy is adapted to receive an original message addressed to a virtual Internet protocol (VIP) address associated with the first and second hosts to identify the first host as being in the active state, and, in response, to encapsulate the original message in at least one Internet protocol (IP) packet to form a tunneled message that includes the VIP address. The first proxy is also responsible for forwarding the tunneled message to the first site. | 11-20-2008 |
| 20080310298 | Providing Bypass Switches to Bypass Faulty Nodes - A streamer or cable for use in subterranean surveying includes a communications link, a plurality of network nodes interconnected by the communications link, where each of the plurality of network nodes is configured to perform a self-test to detect a fault condition of the corresponding network node, and bypass switches to bypass faulty one or more network nodes. | 12-18-2008 |
| 20090034409 | Circuit to provide backup telephone service for a multiple service access system using a twisted pair - A subscriber link to a central office which employs data compression, forward error correction, and advanced modulation techniques and to connect subscribers to multiple communications networks to provide an array of services. A device provides normal telephone service in the event of an equipment failure. At the subscriber end, a server called an intelligent services director (ISD) provides multiple independent connections for telephones which ordinarily connect to multiple access virtual circuits generated on the subscriber link over a twisted pair. A device called a facilities management platform (FMP) at the central office end of the link, among other things, provides interfacing of the subscriber link to various networks including a digital subscriber loop (DLC) and packet switched networks. Ordinarily telephones connected to the ISD require power and correctly functioning modems and controllers in the ISD and the FMP to have access to the outside world. A fail-safe mechanism, however allows at least one chosen phone to function in the event of a failure. The chosen phone must be capable of pulse or DTMF dialing. The connection through which it operate can be switched directly to the twisted pair connecting to the FMP. At the FMP, the twisted pair is switched to tie the connection directly to a line card of the DLC. Alternatively, the ISD contains an interface to a specialized phone designed for the ISD environment. The interface provides the appearance to the DLC of a regular POT. | 02-05-2009 |
| 20090040921 | METHOD AND APPARATUS FOR FAST REROUTE IN A CONNECTION-ORIENTED NETWORK - A method and an apparatus for rapidly resuming, at times of failures, network traffic in a connection-oriented network by using an alternative route pre-computed and stored locally in nodes along an initial route without requiring signaling of upstream nodes or a master server. | 02-12-2009 |
| 20090046576 | FORWARDING DATA IN A DATA COMMUNICATIONS NETWORK - An apparatus for forwarding data in a data communications network having as components nodes and links there between, the apparatus being arranged to forward data to a receiving node via a primary path the apparatus further having a repair capability of computing a repair path around a failure component in the primary path to an address having a repair identifier for the receiving node not via the failure component, the apparatus being arranged to forward data to the receiving node via the repair path upon failure of the failure component if a node in the primary path to the receiving node does not have said repair capability. | 02-19-2009 |
| 20090052316 | COMMUNICATION CONTROL METHOD, ADDRESS MANAGEMENT NODE, AND MOBILE NODE - A technique is disclosed whereby, while a MN (mobile node) is separated from a home network, the status available on a home network is obtained, and a communication path is optimized for a packet to be transmitted between the MN and a CN (correspondent node) via a HA (home agent). According to this technique, an HA | 02-26-2009 |
| 20090059784 | DATA AND VOICE MESSAGING SYSTEM - A data messaging system includes a first Internet Protocol (IP) switch that includes a processor. The data messaging system also includes a first gateserver coupled to the first IP switch and coupled to a second IP switch. The data messaging system includes a second gateserver that is coupled to the first IP switch and to the second IP switch. The data messaging system further includes a first gatekeeper coupled to the first IP switch. The first gatekeeper is adapted to detect a failure of the first gateserver and to route data to the second gateserver in response to detecting the failure. | 03-05-2009 |
| 20090067321 | Method, Computer Program Product, and Network Node Element for More Quickly Detecting Faults on Transmission Paths and/or in Nodes - A communication between network node elements (routers), according to which the routes communicate with one another using a link-state protocol, e.g. IS-IS or OSPF and the failure of a network node element can be identified more rapidly than by the evaluation of hello messages disclosed in prior art is provided. A link-state message is received by a first network node element from a neighboring second network node element, the link states that are contained in the link-state message are compared with at least one stored link state of a network node element that lies adjacent to the first network node element and the compared link states are evaluated as a criterion for a failure of a neighboring network node element. The topology is recalculated, taking into consideration the failure of the neighboring network node element, without waiting for a dead interval based on period link (hello) message to elapse. | 03-12-2009 |
| 20090135715 | DUPLICATE INTERNET PROTOCOL ADDRESS RESOLUTION IN A FRAGMENTED SWITCH STACK ENVIRONMENT - Embodiments of the present invention provide a novel and non-obvious method, system and computer program product for an Internet protocol (IP) address resolution process during an original switch stack fragmentation, by employing a secondary communication link. A method for IP address resolution of a fragmented switch stack over a secondary communication link (e.g., an I2C bus) can include detecting a first switch stack fragment by a first stack master, detecting a second switch stack fragment by a second stack master, disabling all switches of the first switch stack fragment and the second switch stack fragment, connecting the first stack master and the second stack master to a stack management module via a secondary communication link, and electing one stack fragment to use the IP address of the original switch stack based on at least one election criteria. The method can further include instructing the stack master of the elected one stack fragment to power up the switches of the elected one stack fragment. | 05-28-2009 |
| 20090154339 | Method for Switching the Serving Services of Virtual Private Lan and a System Thereof - A method and system for switching the serving services of virtual private LAN is provided. When a fault occurs on a normal service transmission path, a PE device on the secondary path transmits a message including an information of the failure device on the normal service transmission path to the other PE devices on the path to indicate the path switching; the other PE devices replace the faulty PE device corresponding to the transmission path item in VPLS transmission table as the PE device on the secondary path according to the received message for indicating the path switching. Using the present invention, when an access device detects a fault, the VPLS service can switch to the secondary path immediately without affecting other services; because the VPLS messages do not need to be broadcasted during path switching, the network bandwidth will not be wasted. | 06-18-2009 |
| 20090201799 | High-Availability Network Systems - One aspect of the invention comprises a method of operating a network for providing services to subscribers, the network including a configuration system comprising: a core system comprising primary and secondary cores, each core being separately capable of controlling operation of the system; at least one cell connected to the core system; and at least one network element connected to the cell, each network element supporting a number of subscribers for provision of the services; the method comprising: operating the configuration system using the primary core; monitoring operation of the primary core for a failure event preventing the primary core from properly controlling operation of the configuration system; on detection of a failure event, transferring control of operation of the configuration system to the secondary core; following correction of the failure event such that the primary core again becomes capable of properly controlling operation of the configuration system, configuring the secondary core such that it is no longer modified and synchronising the configuration of the primary core with the configuration of the secondary core; and transferring operation of the system back to the primary core. | 08-13-2009 |
| 20090201800 | DISASTER RECOVERY FOR ACTIVE-STANDBY DATA CENTER USING ROUTE HEALTH AND BGP - The present invention provides an active/standby data center that avoids the delay associated with a cached DNS entry to switch from the active data center to the standby data center. When the active data center becomes unavailable, the standby data center advertises the same address as the primary data center so the change over occurs quickly. When the IP address of the primary data center is no longer visible to the standby data center, the standby data center begins to advertise. | 08-13-2009 |
| 20090213730 | Backhaul failover method and system for a wireless network - A method and corresponding system for providing for recovering from a failure of a wired link used for communication between the first access point and a wired network. The first access point has at least two radios including a first radio and a second radio each for providing a wireless communications link. The method including selectively configuring the radios in an access mode for enabling a communications path with a corresponding client node to enable each client node to have a communication path via the first access point to the wired network, wherein the first and second radios are enabled to be associated with a first and second client node, respectively. The method and system includes providing communications paths for the client nodes to the wired network in response to detection of loss of the wired link to the first access point by selectively reconfiguring the second radio to a backhaul mode. | 08-27-2009 |
| 20090245097 | SIGNAL TRANSMITTING DEVICE FOR SWITCHING FORWARDING DESTINATION - A device includes: an ingress interface unit determining an output port of an input signal, adding destination information including information on the output port, and outputting the signal; two or more egress interface units; a switch unit receiving the signal including the destination information, determining a forwarding destination of the signal based on the destination information, and forwarding the signal to at least one of the egress interface units as the forwarding destination; a notifying unit notifying of, when a fault related to the output port occurs, alternative destination information including information of an alternative output port; a registration unit registering the alternative destination information in a storage unit in a way that associates the alternative destination information with the destination information; and a translation unit rewriting, when the storage unit is registered with the alternative destination information, the destination information in the signal into the alternative destination information. | 10-01-2009 |
| 20090252032 | Wireless sensor network gateway unit with failed link auto-redirecting capability - A wireless sensor network gateway unit is proposed, which is designed for integration to a wireless sensor network (WSN) for providing a gateway function with a failed link auto-redirecting capability for the wireless sensor network. The proposed WSN gateway unit is characterized by the provision of an failed link auto-redirecting capability, which can respond to the failure of any sensor node in the WSN system by performing a failed link auto-redirecting operation for redirecting the down-linked good sensor nodes for linking to a nearby good sensor node to thereby allow the down-linked good sensor nodes to be nevertheless able to transfer data to the WSN gateway unit of the invention. This feature allows the WSN gateway unit of the invention to maintain good operational reliability for the WSN system. | 10-08-2009 |
| 20090257346 | MOBILE NETWORK CONTROL APPARATUS AND MOBILE NETWORK CONTROL METHOD - A mobile network control apparatus capable of improving transmission efficiency without giving any processing loads to nodes of a mobile network. In mobile routers to which the present apparatus is applied, a tunnel failure detection unit detects a failure of packet tunneling executed using an interface of the mobile routers. A multi-homing detection unit searches for interfaces having a connection route to a global network out of an interface of the mobile routers according to the detected failure of packet tunneling, A bidirectional tunneling unit executes packet tunneling using the searched interfaces instead of the interface of the mobile routers. | 10-15-2009 |
| 20090262643 | METHOD FOR IMPLEMENTING INTERSECTING RING NETWORK WITH ARBITRARY TOPOLOGY, NODE AND INTERSECTING RING NETWORK - The present invention discloses a method for implementing an intersecting ring network with arbitrary topology, node and an intersecting ring network. The method includes: intersecting multiple Ethernet rings to form the intersecting ring network with arbitrary topology, each Ethernet ring in the intersecting ring network comprising a master node and multiple transmission nodes; the master node of each Ethernet ring opening its primary port and blocking its secondary port during initial normal operation; and the master node of each Ethernet ring in the intersecting ring network performing fault detection and fault processing as well as fault recovery detection and fault recovery processing by using one of the two manners containing protocol message interaction and detection on links directly connected to the master node. | 10-22-2009 |
| 20090303872 | METHOD FOR MANAGING UNDER-RUN AND A DEVICE HAVING UNDER-RUN MANAGEMENT CAPABILITIES - A device having under-run management capabilities and to a method for managing under-runs. The method includes providing, to a memory unit, channel information from multiple channels; allocating time slots for communication channel transmissions; the method is characterized by including: sending, during a time slot allocated for a transmission of channel information from an enabled communication channel, to the shift register channel information of an enabled communication channel, serially outputting the received channel information from the shift register towards a communication line while serially replacing the outputted channel information by a predefined content such that the shift register stores a communication channel disable code when an under-run occurs; defining a communication channel as a disabled communication channel once the under-run occurs; and transmitting, during a time slot allocated to a disabled communication channel, idle signals to the communication line. | 12-10-2009 |
| 20090303873 | Data transmitting apparatus - A data transmitting apparatus includes an actually-used-system package that is connected to outside via a plurality of ports and is actually transmitting data, a waiting-system package that is connected to outside via a plurality of ports and is waiting to substitute the actually-used-system package to transmit data when a failure occurs in the actually-used-system package, a switching requesting unit that switches, when a failure occurs in a port of the actually-used-system package, the port of the actually-used-system package to another port and issues to the waiting-system package a switching request indicating that switching is made to a port corresponding to a switching-target port, and a port switching unit that switches the port of the waiting-system package according to the switching request when the waiting-system package receives the switching request issued from the switching requesting unit. | 12-10-2009 |
| 20090310480 | APPARATUS, METHOD AND SYSTEM FOR MANAGING SESSION ENCAPSULATION INFORMATION WITHIN AN INTERNET PROTOCOL CONTENT BYPASS ARCHITECTURE - An apparatus, method and system for delivering Internet Protocol (IP) content within a system that includes a bypass architecture, using a Session Encapsulation Information Database (SEIDB). Within an existing PacketCable Multimedia (PCMM) framework used as a control plane for IP content bypass flow setup, the SEIDB system stores session bypass encapsulation information for IP content bypass flows within the system. Within the SEIDB, each entry of bypass encapsulation information has a flow classifier component that uniquely identifies a bypass flow in a manner that allows both a cable modem termination system (CMTS) and the IP content source to uniquely identify the bypass flow at the SEIDB. Initially, the CMTS gathers bypass encapsulation information and uploads it to the SEIDB. Before the bypass flow begins, the IP content source obtains the necessary bypass encapsulation information from the SEIDB, e.g., using a flow classifier as a search filter item. | 12-17-2009 |
| 20100002576 | SYSTEM AND METHOD IN AN INTER-CARRIER NETWORK INTERFACE - A system that incorporates teachings of the present disclosure may include, for example, a PE-ASBR (Provider Edge-Autonomous System Boundary Routers) having a controller to receive new routing information without an attribute of origin, insert a site of origin of the PE-ASBR into the new routing information if the PE-ASBR is dual-homed to another MPLS-VPN cluster, and broadcast to other network elements the new routing information with the site of origin of the PE-ASBR. Additional embodiments are disclosed. | 01-07-2010 |
| 20100014416 | SYSTEMS AND METHODS FOR ROUTING DATA IN A COMMUNICATIONS NETWORK - A network device includes a group of interfaces. Each interface is associated with at least one other interface of the group of interfaces and a group of network addresses. Each interface is configured to monitor at least one of the group of network addresses with which the each interface is associated or the at least one other interface with which the each interface is associated, and determine whether to logically shut down based on the monitoring. | 01-21-2010 |
| 20100020676 | Method for maintaining connectivity in failed switches of stack - Plural of switches are connected as switch stacking for easier management. Failures of stack member switches disrupts the stack and network availability. This invention discloses a method to maintain stacking connections in failed switches. This invention introduces a small circuit to monitor health of the switch and short circuit the stacking connections in case of switch failures. | 01-28-2010 |
| 20100020677 | METHODS AND SYSTEMS FOR AUTOMATICALLY RENAMING LOGICAL CIRCUIT IDENTIFIERS FOR REROUTED LOGICAL CIRCUITS IN A DATA NETWORK - Methods and systems are provided for automatically renaming logical circuit identifiers for rerouted logical circuits in a data network. A first logical circuit identifier for a first logical circuit in a first network is identified. When a failure is detected in the first logical circuit, a second logical circuit identifier for a second logical circuit in a failover network separate from the first network is identified and the first logical circuit is renamed without manual intervention to identify the first logical circuit using the second logical circuit identifier. The second logical circuit is to reroute data from the first logical circuit. | 01-28-2010 |
| 20100020678 | SWITCHING PROGRAM, SWITCHING METHOD AND FULL DUPLEX SYSTEM - When a switching unit of each of first DB servers receives a transaction-stop instruction request from a second DB server, the switching unit performs a transaction-stop instruction process. When a transaction processing unit of each of the first DB servers receives a transaction stop instruction from the switching unit, the transaction processing unit performs a transaction stop process. In the same manner, a transaction processing unit of the second DB server performs a transaction stop process. Each of the transaction processing units of the first and second DB servers determines whether a transaction is to be stopped depending on a processing attribute and a processing state of an SQL included in the transaction and then performs the transaction stop process depending on a determination result of the processing attribute and the processing state. | 01-28-2010 |
| 20100039932 | Hierarchical Redundancy for a Distributed Control Plane - A method and apparatus for hierarchical redundancy for a distributed control plane. In one embodiment of the invention, control plane processes are distributed among a plurality of processing entities including an active primary control processing entity and multiple secondary processing entities. Each of the secondary processing entities performs a dual role; an active role and a standby role. An application redundancy manager (ARM) instantiated on the active primary control processing entity manages the redundancy services for the secondary processing entities. For each secondary processing entity, the ARM selects one of the secondary processing entities to act as a backup for another one of the secondary processing entities. Upon a failure of one of the secondary processing entities, the ARM causes the secondary processing entity backing up the failed secondary processing entity to transition its standby role to an active role regarding the services provided by the failed secondary processing entity. | 02-18-2010 |
| 20100039933 | METHOD AND SYSTEM FOR NETWORK SETUP AND MAINTENANCE AND MEDIUM ACCESS CONTROL FOR A WIRELESS SENSOR NETWORK - A sensor network having a first command center and a first access node, comprising a wireless transceiver, coupled to the command center. The sensor network may also include a plurality of nodes individually comprising a wireless transceiver and a directional antenna, wherein each of the plurality of nodes is successively located in a downlink direction relative to the first access node, and is configured to wirelessly communicate via the directional antenna with at least one node of a first neighbor group in a first direction and at least one node of a second neighbor group in a second direction. In addition, a sensor device is individually coupled to at least one of the nodes, and is configured to provide sensor data for the first command center. | 02-18-2010 |
| 20100074097 | Method of Communicating In Wireless Network - The present invention relates to a handover method that a current coordinator transfers a coordinating function of controlling a network to a different device configuring the network. The present invention relates to a method of selecting an optimal device as a coordinator in selecting the different device using priority information decided by a prescribed evaluation reference. And, the present invention relates to a method of simplifying a procedure in a manner of transmitting relevant information together with a handover request message. In a wireless network including a coordinator, a secondary coordinator is decided in advance. If the coordinator is suddenly unable to perform a function, the present invention relates to a method of enabling the function of the coordinator to be performed by the decided secondary coordinator. Thus, a process for transferring the coordinating function without the handover process is called a recovery process. The present invention relates to the recovery method and a method of deciding a secondary coordinator to perform a recovery. In the method of deciding the secondary coordinator, a method of deciding a more proper coordinator using information on coordinator priority is provided. | 03-25-2010 |
| 20100074098 | METHOD AND DEVICE FOR PROTECTING ETHERNET TREE SERVICES - A method and device for protecting Ethernet Tree (E-Tree) services are disclosed. An ID is configured for each branch of the E-Tree. The method includes: determining a branch that needs to perform switching; notifying the ID of the branch that needs to perform switching to a work E-Tree through a root UNI of a protect E-Tree; and switching data over the branch that needs to perform switching from the work E-Tree to the protect E-Tree according to the ID of the branch that needs to perform switching. In the embodiments of the present invention, because an ID is configured for each branch of the E-Tree, the branch corresponding to the ID may be triggered to perform protection switching as required, thus implementing branch switching. | 03-25-2010 |
| 20100080117 | Method to Manage Path Failure Threshold Consensus - A system for providing hosts with a capability to determine which threshold rule of a plurality of threshold rules to use based upon threshold consensus. For example, the system would address a configuration case of several hosts sharing an output port of a fabric via zoning and that port being connected to a single port of a storage controller. If one host is executing lower priority jobs and its threshold is much higher than another host with higher priority jobs and a lower threshold, and the storage controller recognizes that several hosts are sharing the same storage controller port, the consensus will be to ignore the threshold of the first host and to use the threshold of the second host to prevent performance degradation in the system. | 04-01-2010 |
| 20100103812 | Transfer Of User Dial Plan To An Access Gateway - A system, method, and Soft Switch for maintaining a current user dial plan in an Access Gateway. When an H.248 control link is established between the Access Gateway and the Soft Switch, the Soft Switch downloads the current dial plan to the Access Gateway. The downloaded information includes termination IDs and Directory Numbers/Subscriber Numbers, DN/SNBs, for all of the users connected to the Access Gateway. Whenever the Soft Switch receives changes to the dial plan, the Soft Switch updates the user dial plan in the Access Gateway. | 04-29-2010 |
| 20100124165 | Silent Failure Identification and Trouble Diagnosis - According to one method for identifying and resolving a silent failure in a telecommunications network, performance data associated with data traffic passing through a network element in the telecommunications network is collected. A determination is made whether the performance data has fallen below a threshold to identify the silent failure at the network element. The silent failure fails to trigger an alarm included on the network element. Responsive to determining that the performance data is below the threshold and thereby identifying the silent failure at the network element, troubleshooting rules may be retrieved. The silent failure is resolved based on the performance data and the troubleshooting rules. | 05-20-2010 |
| 20100128597 | DATA CONTROL DEVICE, STORAGE DEVICE AND METHOD OF CONNECTING DATA CONTROL DEVICE - A data control device includes: a switch portion that has a plurality of first terminals on an upstream side, a plurality of second terminals on a downstream side, and a circuit portion that optionally switches a connection between the first terminals and the second terminals based on an external switching signal; and at least one control portion that has a first input/output portion on the upstream side and a second input/output portion on the downstream side, wherein the second input/output portion is connected to the first terminal of the switch portion and the first input/output portion is connected to the second terminal of the switch portion, and wherein the at least one control portion controls an input/output of data between the first input/output portion and the second input/output portion. | 05-27-2010 |
| 20100128598 | SYSTEMS AND METHODS FOR MAINTAINING PERSISTENCE BY A BACKUP VIRTUAL SERVER - The present disclosure presents systems and methods for maintaining persistence of a backup virtual server on connections currently serviced by the backup virtual server. A virtual server operating on an intermediary network device and identified as a primary virtual server for a first connection may receive a request via the first connection. The intermediary device may forward the first request to a backup virtual server of the virtual server in response to identifying that the virtual server is unavailable. The intermediary device may later identify that the virtual server is available. The virtual server may establish a new connection responsive to receiving a connection request while the intermediary device may forward a second request received via the first connection to the backup virtual server instead of the virtual server responsive to identifying that the virtual server is configured not to preempt the backup virtual server from maintaining connections currently maintained by the backup virtual server. | 05-27-2010 |
| 20100135151 | NETWORK INTERFACE APPARATUS FOR BYPASSING INOPERABLE NETWORK DEVICE - A network interface apparatus is capable of bypassing an inoperable or failed network device. According to an exemplary embodiment, the network interface apparatus includes first and second transformers. A network input and a network output are respectively coupled to a first side of the first transformer and a first side of the second transformer. A terminal input and a terminal output are respectively coupled to a second side of the first transformer and a second side of the second transformer. A switch assembly is coupled to the second sides of the first and second transformers. When the switch assembly is in a first state, the second side of the first transformer is coupled to the terminal output, and when the switch assembly is in a second state, the second side of the first transformer is coupled to the first side of the second transformer bypassing the terminal output. | 06-03-2010 |
| 20100142368 | FAILOVER AND FAILBACK OF COMMUNICATION BETWEEN A ROUTER AND A NETWORK SWITCH - A router is provided. The router includes a primary interface, a backup interface, a processor, and a memory. The primary interface and backup interface may be used to communicate with a network switch. The router may be configured to determine whether the primary interface is stable. The primary interface is stable when the primary interface may be used to exchange information with a network switch over a primary network segment. The router may be configured to activate the primary interface when the primary interface is determined to be stable. The router may also be configured to activate the backup interface when the primary interface is determined to be not stable. The backup interface may be activated for the exchange of information with the network switch. | 06-10-2010 |
| 20100149966 | STATELESS, AFFINITY-PRESERVING LOAD BALANCING - The invention relates to an architecture that facilitates load balancing among a plurality of hosts and preserve session affinity to a given host. An incoming stream of data packets that include packet sessions is input to one or more forwarding mechanisms for forwarding to one or more hosts. The forwarders generate a routing function that takes into consideration host availability, and distributes session packets according to the routing function. A session is distributed to the same host to preserve session affinity. When host availability changes, a new routing function is generated, such that any new session is routed according to the new routing function and existing sessions are routed according to the old routing function. When the old routing function becomes irrelevant, it is phased out. An optimization utilizes a maximally backward compatible hash function to minimize the differences between the old and new routing functions. | 06-17-2010 |
| 20100165831 | Load balancing and fault protection in aggregation networks - A system, device, and method for aggregating traffic in a network, such as for wireless backhaul traffic in a cellular communication system. UE device traffic is sent to and from an access bridge, which is one node in an access network formed into a ring topology, and from the access bridge to a core bridge in communication with a core network of the communication system. According to a preferred embodiment, the access bridge and the core bridge each have a LAG component configured according to IEEE 802.1D and IEEE 802.3-2005, and a ring component configured according to IEEE 802.1Q or 802.1AD. In operation, this LAG component load balances communication traffic coming into the bridge node onto one of two VLANs formed of portions of the access network ring. In the event of a fault condition affecting one of the two VLANs, the fault VLAN is removed from the aggregation scheme until the fault condition is alleviated. | 07-01-2010 |
| 20100165832 | HVPLS Hub Connectivity Failure Recovery With Dynamic Spoke Pseudowires - Techniques for recovering from hierarchical virtual private LAN service (HVPLS) hub connectivity failure with a dynamic spoke pseudowire. According to one embodiment of the invention, a provider edge (PE) network element in the HVPLS hub monitors for a failure of HVPLS hub connectivity failure and reuses an HVPLS spoke connectivity failure recovery mechanism in an MTU by fabricating failure of one or more spoke facing connectivity elements coupling the MTU with the PE network element causing the MTU to transition to a secondary PE network element in the HVPLS hub. In addition, the PE network element establishes a dynamic spoke pseudowire for each virtual instance affected with the MTU to restore HVPLS hub connectivity for that PE network element. | 07-01-2010 |
| 20100165833 | METHOD, SYSTEM, AND NETWORK ELEMENT FOR SERVICE PROCESSING AFTER DATA OF NETWORK ELEMENT IS INVALID OR NETWORK ELEMENT FAILS - A method, a system, and a network element for service processing after data of a network element is invalid or a network element fails are provided. When the service network element ( | 07-01-2010 |
| 20100177630 | SYSTEM, METHOD, AND DEVICE FOR AUTOMATIC PROTECTION SWITCHING - The present invention relates to network management and discloses a system, method, and device for Automatic Protection Switching (APS). The system includes a sending device and a receiving device. The sending device includes a first sending line card and a second sending line card. The receiving device includes a first receiving line card and a second receiving line card. In the embodiments of the present invention, the first receiving line card and the second receiving line card check arrival of continuity check messages, and perform centralized switching control on the line cards automatically according to the check result, thus improving APS efficiency and reliability of a PS-based transport network. | 07-15-2010 |
| 20100182901 | Energy-Efficient Network Protocol and Node Device for Sensor Networks - An “on-demand” approach for a routing protocol for a wireless network that achieves balanced energy consumption among all participating nodes in the network. Synchronization messages transmitted by nodes associated with an upstream node include local node information (LNI) that a node can use to repair or bypass a lost upstream node in a real or virtual (temporary) manner depending upon the local node's battery level. Only if a repair process fails will a global re-organization (Re-Org) be initiated. The LNI also allows for nodes having lower power availability (battery level) not to transmit the LNI so that unaffiliated node(s) can select an upstream node having more power availability thereby extending network life. | 07-22-2010 |
| 20100238794 | N+1 Protection Using a Processor-Based Protection Device - In an N+1 protection scheme for a router in a data or telecommunications network, a processor-based protection unit has a replica device handle, corresponding to each of the N working units, stored in the protection unit's local memory. Each replica device handle is an image of the connections provided by the corresponding working unit. In one implementation, upon detection of a failure of one of the working units, the router's controller unit sends a single command to instruct the protection unit to reconfigure itself using the corresponding locally stored replica device handle to assume the routing functions of the failed working unit. | 09-23-2010 |
| 20100265816 | MONITORING SWITCHING NETWORKS - A system and method are described for detecting failures of switches in a switching network including a plurality of switches. The sensing circuit includes a plurality of detecting networks, the plurality of detecting networks being fewer than the plurality of switches, each detecting network providing signals indicative of a failure of at least one of the switches. | 10-21-2010 |
| 20100265817 | Ring network and network relay device - A ring network with plural network relay devices connected in a ring shape includes first and second control ports to be transitioned into either a forwarding state that permits relaying information, or a blocking state that prohibits relaying information; and a ring protocol control unit for transmitting connection confirmation information indicative of communications being possible between the first and the second control port, from the first to the second control port, and from the second to the first control port at a predetermined time interval, or for, in the event that the first or the second control port does not receive the connection confirmation information from the second or the first control port, transmitting failure information indicative of communications being not possible between the first and the second control port, from the first to the second control port, or from the second to the first control port. The ring protocol control unit transitions the first control port into the blocking state when the first control port receives the failure information, or into the forwarding state when the first control port transmits the failure information. The ring protocol control unit transitions the second control port into the blocking state when the second control port receives the failure information, or into the forwarding state when the second control port transmits the failure information. | 10-21-2010 |
| 20100265818 | MOBILE DEVICE, BASE STATIONS, BACKHAUL NETWORK DEVICE, AND METHOD AND COMPUTER PROGRAM STORAGE PRODUCT FOR THE MOBILE DEVICE - A mobile device, base stations, a backhaul network device for a wireless network system, and a method and a computer program storage product for the mobile device are provided. Each of the base stations is connected to the backhaul network device via a wired connection. The mobile device selects a primary base station and a backup base station from the base stations according to base station information of each base station. The mobile device performs a data transmission procedure with the primary base station during an available interval of a low-duty mode to communicate with the backhaul network device via the primary base station, and performs a connection keeping procedure with the backup base station during an unavailable interval of the low-duty mode. While the data transmission procedure fails, the mobile device performs a data transmission recovery procedure with the backup base station immediately so as to continuously communicate with the backhaul network device via the backup base station. | 10-21-2010 |
| 20100284268 | Node State Recovery for a Communication Network - Recovering state information for a node in a communication network includes receiving a path message after occurrence of a fault condition. A unique path identifier associated with the path message may be compared to at least one stored unique path identifier. In response to a determination that the unique path identifier associated with the path message matches at least one stored unique path identifier, path resource requirements associated with the path message may be compared to previously-committed resources associated with the at least one stored unique path identifier. In response to a determination that the path resource requirements associated with the path message match previously-committed resources associated with the at least one stored unique path identifier, a communications channel may be maintained through the node using the previously-committed resources and based on path information set forth in the path message. | 11-11-2010 |
| 20100290336 | Optimized Bandwidth Allocation for Guaranteed Bandwidth Services - A method for minimizing bandwidth allocation for alternative routes within a network provides a management system for managing routes of services, provides a plurality of guaranteed bandwidth (GWB) services, assigns to each GBW-service a traffic class (TC), and calculates for each GBW-service of a protected TC an active route and an alternative route. The active route is a planned route in case of absence of a respective network failure and the alternative route is the route which guarantees that, in case of a network failure with respect to the active route, the GBW-service is protected. Further, a first optimized protection mode is provided to be assigned to all the GBW-services belonging to a given protected TC. The first optimized protection mode has a first optimization step including reserving bandwidth for each GBW-service only once for each network resource employed by the active and/or the alternative route of each GBW-service. | 11-18-2010 |
| 20100290337 | Network access nodes - A communication system, method and program, the system comprising: one or more wireless access nodes of a first communication service provider and at least one server associated with a second communication service provider, interconnected via a packet-based network; and a wireless user terminal operable to establish a session with one of the wireless access nodes of the first communication service provider, the wireless user terminal is installed with an application of the second communication service provider. The application is configured so as to: in event of failure to establish a session via one of the wireless access nodes of the first communication service provider, store information regarding the failed session at the wireless user terminal; and in event of subsequent access to the packet-based network, transmit the information regarding the failed session to the server associated with the second communication service provider over the packet-based network. | 11-18-2010 |
| 20100290338 | Determining Paths That Satisfy A Reliability Requirement - In certain embodiments, a method includes receiving path information. A reliability requirement is established, and paths that satisfy the reliability requirement are determined. Each path comprises nodes. Configuration of the nodes of the paths according to the reliability requirement is facilitated. | 11-18-2010 |
| 20100290339 | Fault-Tolerant Ethernet Network - Fault-tolerant Ethernet is provided through the use of special interfaces providing duplicate ports that may be alternatively enabled with the same network address. A switching between the ports, corrects for single faults in a two-way redundant system without time-consuming reconfiguration of other end devices or the need for complex middleware in the end devices. | 11-18-2010 |
| 20100296391 | Method for Conducting Redundancy Checks in a Chain Network - The present invention relates to a method for conducting redundancy checks in a chain network, wherein the two ends of the chain network are equipped with a first switch and a second switch respectively, and a port of the first or second switch used for communicating with an external network is set to be blocked, so that when an link failure happens to any switch of the chain network, the two switches close to the link failure port sends control packets to the first and second switches respectively to forward the port that is originally blocking, thus making the network to return to normal state quickly. Besides, as the first and second switches are used to connect other chain networks, external network devices or external redundant network architectures, it allows more network nodes to be included in single network architecture and provides flexibility and compatibility in use by including different redundancy mechanisms. | 11-25-2010 |
| 20100296392 | DETERMINING LINK FAILURE WITHIN A NETWORK - Methods and systems for determining link failure in a network are provided. According to one embodiment, multiple paths are provided between each pair of multi-path load balancing (MPLB) components within a Layer 2 network by establishing overlapping loop-free topologies in which each MPLB component is reachable by any other via each loop-free topology. A first MPLB component sends latency requests to a second MPLB component via a particular path. Responsive thereto, the first MPLB component receives latency responses. Based on timestamp information in the latency responses, an estimated latency between the first and second MPLB components is determined. A link failure timeout period is derived based upon the estimated latency. An additional latency request is sent. If an additional latency response is not received by the first MPLB component prior to expiration of the link failure timeout period, then it is concluded that a link failure has occurred. | 11-25-2010 |
| 20100302933 | Robust Routing of Data in Wireless Networks - A wireless network ( | 12-02-2010 |
| 20100302934 | POWER RAMPING FOR RACH - The present invention relates to a method for requesting access to a resource, said method comprising a secondary station transmitting an access preamble to a primary station, upon failure of correct transmission of the access preamble, the secondary station starting a first power ramping scheme for transmitting the access preamble, upon failure of correct transmission of the access preamble with the first power ramping scheme, the secondary station transmitting a second access preamble with a second power ramping scheme being different from the first power ramping scheme. | 12-02-2010 |
| 20100322068 | DIRECT TUNNEL ERROR HANDLING - An apparatus is disclosed which according to an embodiment is configured to store a direct tunnel context. The direct tunnel context comprises a field or flag indicating whether or not a direct tunnel is established between the apparatus and a radio network, and further comprises at least one of a tunnel endpoint identifier and an address of a user plane of a serving node. The direct tunnel context optionally further comprises at least one of a tunnel endpoint identifier and an address of a user plane of a controller of the radio network. The apparatus may be a gateway or a gateway general packet radio service support node. The invention further provides a method, system, device and program suitable or configured to handle such direct tunnel contexts. | 12-23-2010 |
| 20100329110 | Method for reconvergence after failure in a dual-homing network environment - A manner of providing for re-convergence in a dual homing network following the failure of one of the dual homing links. When such a failure is detected, the port roles are recomputed using an xSTP protocol. Prior to the completion of the computation, the operEdge variable is set to true, typically resulting in a more rapid re-convergence that may achieve sub 50 ms performance. When the computation is complete, the operEdge variable is reset to “false. The xSTP protocol may be, for example, RSTP or MSTP. The invention may be implemented in a CE device attached to a VPLS core or other network, and may be used in a LAG environment. | 12-30-2010 |
| 20110019533 | Network Element Bypass in Computing Computer Architecture - A method and apparatus in accordance with the present invention provides monitoring a self-adjusting multi-tier processing system. At least one computing resource of one of the tiers of the self-adjusting multi-tier processing system is dynamically bypassed based on at least one predetermined criterion, wherein dynamically bypassing energizes or de-energizes a bypass control switch that operates to route data between tiers of the system in a manner that excludes the at least one computing resource. | 01-27-2011 |
| 20110019534 | Systems and Methods of Multicast Reconfiguration Using Cross-Layer Information - Systems and methods of multicast configuration are provided. A particular method includes detecting a failure in the data network at a first node of a data network. The method also includes determining an alternate route from the first node to a data source of the data network. The alternate route includes a second node as an upstream node. The method further includes determining whether the alternate route would create a loop in the data network. The method includes setting a state of the first node to a waiting-to-join the second node state when the alternate route would create a loop. | 01-27-2011 |
| 20110026393 | RF SITE RESILIENCE USING MULTIPLE VISITOR LOCATION REGISTERS SIMULTANEOUSLY - A method and system are presented in which communication redundancy is provided. Multicast packets having the same audio and/or control data are simultaneously transmitted between an RF site and different switches through different communication links. The packets from the RF site have different origination addresses and a unique ID, which permits duplicate packets having different origination addresses but the same unique ID and data to be eliminated and only one set of packets to be transmitted over the air to a receiving end device for which the packets are intended. A switch communication link between the switches permits the primary switch to establish operating characteristics for the alternate switch. | 02-03-2011 |
| 20110026394 | DISTRIBUTED ETHERNET SYSTEM AND METHOD FOR DETECTING FAULT BASED THEREON - A distributed ethernet system including a plurality of switches, which switches are connected in sequence to form a ring, where after being synchronized in clock, each of the switches sequentially performs loop detection and protocol machine detection periodically according to a predetermined configuration, and sends a fault alarming message when a loop fault or a protocol machine fault occurs. A fault detecting method based on the system is further provided | 02-03-2011 |
| 20110026395 | Preserving Stable Calls During Failover - According to one method for preserving stable calls during failover, during a dialog between two user endpoints, a determination is made whether a standby call processor has become operational, such as when a corresponding primary call processor is in fault. Responsive to determining that the standby call processor has become operational, a signaling protocol message is received from a requester. A determination is made whether the message includes an in-dialog signaling protocol request. Responsive to determining that the message includes the in-dialog request, a determination is made whether a call state associated with the dialog is found in memory. Responsive to determining that the call state associated with the dialog is not found in memory, a non-call terminating error response is made responding to the in-dialog request. The non-call terminating error response may cause the requester to terminate the in-dialog request but not terminate the dialog. | 02-03-2011 |
| 20110032814 | Session Resilience Prioritization Queuing Mechanism to Minimize and Eliminate Packet Loss - A method for managing a plurality of subscriber sessions tied to mobile devices in a router, each subscriber session of the plurality of subscriber sessions assigned to a line card in the router, the line card implementing a data plane entity and a control card implementing a control plane entity, the method comprising: redistributing each subscriber session in the plurality of subscriber sessions assigned to a failed line card in the router to minimize packets lost and maximize subscriber session retention, redistributing including classifying each subscriber session in the plurality of subscriber sessions into a plurality of priority queues, in response to detection of the failed line card, transferring each subscriber session in the plurality of subscriber sessions assigned to the failed line card to one of a plurality of operating line cards in priority queue order. | 02-10-2011 |
| 20110038253 | TRANSPORT CONTROL SERVER, TRANSPORT CONTROL SYSTEM, AND BACKUP PATH SETTING METHOD - A transport control server (TCS) identifies a backup path B switched over to from an active path A due to a path change or a fault, based on information in a path change notification or a fault notification. The TCS identifies a backup path C affected by the switchover from the active path to the backup path. The TCS identifies nodes in which a setting change to delete the backup path C is needed and nodes in which a backup path D should be set up as an alternative to the backup path C and transmits a setting change notification to these nodes. | 02-17-2011 |
| 20110038254 | APPARATUS AND METHOD FOR FINDING A PAIR OF DISJOINT PATHS IN A COMMUNICATION NETWORK - There is provided topology information including connection states among nodes in a network, and port information including restriction conditions on connectivity among ports within a restricted node. A path search apparatus finds a first path having the minimum total link-cost among a plurality of paths. The topology information is changed so that the first path is not searched for as a path having the minimum total link-cost among the plurality of paths, and the port information is changed based on a port connectivity change rule. Then, the path search apparatus finds a second path different from the first path, based on the changed port information and the changed topology information, and reconfigures a pair of link-disjoint paths satisfying the restriction conditions imposed on the restricted node, by removing a link shared by both the first and second paths from the original topology information. | 02-17-2011 |
| 20110044163 | COMMUNICATION NETWORK SYSTEM, COMMUNICATION DEVICE, ROUTE DESIGN DEVICE, AND FAILURE RECOVERY METHOD - A communication network system including a plurality of communication devices each including a switching unit which switches traffic routes, and transmission links which connects the plurality of communication devices, wherein a start-point communication device of the plurality of communication devices including: a storage unit which previously stores information of a plurality of detour paths corresponding to but having routes different from a working path that is transferring traffic between the start-point communication device and an endpoint communication device; and a setting unit which receives a failure notification when a failure occurs in the working path, selects a detour path that is switchable and has the highest priority from among the plurality of detour paths stored in the detour path information storage unit, and then sets relevant communication devices among the plurality of communication devices along the route of the detour path to recover from the failure. | 02-24-2011 |
| 20110051595 | TRANSMISSION APPARATUS - A transmission apparatus switches to a line of one standby system upon occurrence of a fault on any one of n lines of a working system. The transmission apparatus includes a switching controller that when switching from a line of the working system to a line of the standby-system upon the occurrence of the fault and executing a given command to put the line causing the fault in a given state of line switching according to the given command, causes the working system to maintain the state of line switching according to the given command even after restoration from the fault. | 03-03-2011 |
| 20110069607 | METHODS AND SYSTEMS FOR CONTINUITY CHECK OF ETHERNET MULTICAST - Methods and systems for continuity check of Ethernet multicast are provided. A root MEP multicasts frames with continuity check function information to all leaf MEPs in a multicast group, using a multicast DA. The leaf MEP in a defect condition transmits a frame with defect indication information to the root MEP. Responsive to receiving the frame with defect indication information, the root MEP, using a unicast address of the leaf MEP in a defect condition, transmits a frame with continuity loss information only to the leaf MEP in a defect condition. | 03-24-2011 |
| 20110075550 | Method of M:1 Protection - An apparatus comprising a first segment endpoint bridge (SEB) configured to couple to a second SEB via a plurality of path segments, wherein the path segments comprise a working segment and a plurality of candidate protection segments, wherein the candidate protection segments comprise a protection segment that is configured to protect the working segment, wherein the candidate protection segments other than the protection segment do not protect the working segment, wherein only one first state variable is used to maintain each of the candidate protection segments other than the protection segment, and wherein a plurality of second state variables are used to maintain each of the working segment and the protection segment. | 03-31-2011 |
| 20110075551 | APPARATUS AND METHOD FOR SETTING NETWORK ADDRESS IN PACKET COMMUNICATION SYSTEM - An apparatus and method for a connection method of a support sub-layer in a packet communication system are provided. In the method, whether a timeout occurs is determined while communication is performed with a destination node. When the timeout occurs, a first connection to the destination node is tried using a first address set having a highest priority in an address management table. When the first connection fails, a second connection to the destination node is tried in a pipeline manner on the basis of address sets inside the address management table. Valid address sets are generated via the second connection. | 03-31-2011 |
| 20110090783 | METHOD AND SYSTEM FOR SMART PROTECTION OF ETHERNET VIRTUAL PRIVATE-ROOTED MULTIPOINT SERVICE - A method and system for smart protection of Ethernet Virtual Private-Rooted Multipoint Service (EVP-RMP) are provided. The method comprises sending data from a head node through a first root node to a plurality of leaf nodes on their respective first paths; switching a leaf node from its first path to a second path connected to a second root node to receive the data from the head node, if the first path of the leaf node is broken; and maintaining the first paths of the other leaf nodes to receive their data from the head node. The method and system provide an effective protection to services of the user with the broken path without interrupting services of other users, so as to obtain enhanced service reliability and flexibility with reduced switch time. | 04-21-2011 |
| 20110110221 | Signaling Gateway for Routing Signaling Messages - A method of operating a signaling gateway for routing signaling messages between a SS7 network and an IP-based network is provided. The signaling gateway has a signaling point code allocated as a network address. Further, a signaling gateway for routing signaling messages between a SS7 network and an IP-based network is provided. The signaling gateway comprises an interface towards the SS7 network and an interface towards the IP-based network. The signaling gateway comprises a processing unit which may implement a SS7 protocol stack and an IP protocol stack. The processing unit may be configured to translate a message delivered to an upper protocol layer of the SS7 protocol stack to a corresponding message conforming to a user adaptation protocol of the IP protocol stack. | 05-12-2011 |
| 20110128844 | METHOD, SYSTEM AND DEVICE FOR RECOVERING SERVICE - A method, system and device for recovering services are provided, which relate to the field of communication. The method includes the following steps. Working resources of a Traffic Engineering (TE) link in a network are set to a shared MESH recovery state, and information of the shared MESH recovery state is flooded into the network, in which the information of the shared MESH recovery state is used to broadcast that the failure recovery mode of the working resources of the TE link is a band-level shared MESH recovery mode; whether the TE link fails is detected; and when detecting that the TE link fails, services on the working resources of the TE link are recovered by switching the N band-level FA LSPs on the TE link to the corresponding N band-level shared MESH recovery paths. The technical solutions reduce service recovery time and satisfy service requirements of customers while increasing bandwidth resource usage rate. | 06-02-2011 |
| 20110134749 | Resource Pooling in a Blade Cluster Switching Center Server - The present invention relates to a switching center server comprising: —a blade cluster with a plurality of blades ( | 06-09-2011 |
| 20110141879 | 1-FOR-N REDUNDANCY IN PRIVATE IP SESSION BORDER CONTROL NETWORKS - One or more devices in a provider network receive a notification that a border controller (SBC) device has failed and, in response to the notification, modify a backup SBC configuration file for the failed SBC device to create a modified backup configuration file, where the modified backup configuration file replaces carrier-side Internet Protocol (IP) addresses of the failed SBC device with carrier-side addresses of a failover SBC device. The devices send the modified backup configuration file to the failover SBC device to configure the failover SBC device and send a backup router configuration file for a local router associated with the failed SBC device to a local router associated with the failover SBC device, where the backup router configuration file is to configure the local router associated with the failover SBC. The devices also provide, to a domain name system (DNS) server, carrier-side IP addresses for the failover SBC device to replace IP addresses associated with fully-qualified domain names (FQDNs) of the failed SBC device. | 06-16-2011 |
| 20110141880 | Hierarchical Protection Switching Framework - A hierarchical protection switching framework uses detectors and protectors. A protector registers with a detector to receive notifications. A detector identifies a condition and the interested protector, and notifies the interested protector. The protector in response to the notification, typically either performs protection switching or notifies another protector of the condition. This protection switching is an extensible operation, and typically may include, but is not limited to switching traffic to a backup facility from a facility corresponding to the condition and switching traffic to a backup component from a component corresponding to the condition. The decision of a protector whether to notify another protector of the condition can be made based on different factors, such as, but not limited to a failure of the protection switching by the protector, a database lookup operation to identify whether notification of another particular condition has been received or not received, etc. | 06-16-2011 |
| 20110164493 | PROTECTION FOR PROVIDER BACKBONE BRIDGE TRAFFIC ENGINEERING - Network protection between endpoints includes both end-to-end and local section protection. A primary path between the endpoints includes a plurality of links, and is protected on an end-to-end basis by a protection path associated with different links. At least one sections of the primary path is also protected on a local basis, where a “section” is a link, ring, trunk or other portion of a network. One or more sections of the protection path may also be protected on a local basis. In response to detection of a fault condition, section protection is utilized to overcome the fault if possible, and otherwise end-to-end protection is utilized. Invoking section protection does not imply a switchover from the primary end-to-end path to the protection end-to-end path. Rather, the primary end-to-end path is rerouted in the affected section. | 07-07-2011 |
| 20110170405 | MULTI-PATH NETWORK - The present invention provides a multi-path network for use in a bridge, switch, router, hub or the like, the multi-path network including a plurality of network ports; a plurality of network elements; and a plurality of network links interconnecting the network elements and the network ports for transporting data packets, each network element including a fault monitor for detecting faults on the network links to which the network element is connected, a plurality of dynamically selectable output ports and output port selection mechanism and each network element being adapted to communicate the existence of a fault back to one or more other network elements via which network elements the faulty network link can be bypassed, and each network element being adapted to update the output port selection mechanism when communication of the existence of a fault is received so that only output ports which ensure the faulty network link is bypassed are dynamically selectable. Also provided is a method of managing faults in a multi-path network. | 07-14-2011 |
| 20110176409 | Method for Implementing Permanent Ring Network Protection in an MESH Network - A method for implementing permanent ring network protection in an MESH network, the method includes the following steps: a node in a ring network protection group informing, when detecting a certain span fails, other nodes in the ring network protection group of the failure information ( | 07-21-2011 |
| 20110176410 | VIRTUAL ROUTER FAILOVER DAMPENING - A virtual router spans a number of physical routing devices. One of the physical routing devices is designated as master, and the other physical routing devices are designated as backups to the master. A failover protocol that includes both a non-dampened state and a dampened state can be implemented. According to the failover protocol, an attempt to designate one of the backups as master in place of the current master is permitted while the virtual router is in the non-dampened state, while such an attempt is suppressed while the virtual router is in the dampened state. | 07-21-2011 |
| 20110194403 | Fault isolation in trill networks - In one embodiment, a method includes generating at an ingress routing bridge in a TRansparent Interconnection of Lots of Links (TRILL) network, a trace message for a specified flow along a path from the ingress routing bridge to a destination reachable through the TRILL network, transmitting a single trace message from the ingress routing bridge to a next-hop routing bridge in the TRILL network, receiving a plurality of reply messages in response to the transmitted trace message, and identifying the routing bridges in the path and a location of any fault in the path. An apparatus for fault isolation in a TRILL network is also disclosed. | 08-11-2011 |
| 20110205885 | Optimized Fast Re-Route In MPLS Ring Topologies - A method performed on a network element employing Multi-protocol Label Switching (MPLS) to optimize bandwidth in a ring topology network including a back-up Label Switch Path (LSP) for a protected LSP by re-routing traffic onto the back-up LSP to avoid shared links between the protected LSP and back-up LSP, including receiving a first labeled packet from another label switch router (LSR) in the back-up LSP, the first labeled packet indicating that a protection switch of data is to be performed from the protected LSP to the back-up LSP, determining whether a shared link in the ring topology network exists between the protected LSP and the back-up LSP, rerouting traffic for the protected LSP onto an optimized back-up LSP to remove the shared link, receiving a second labeled packet indicating that a protection switch of data is to be performed, and restoring routing of the traffic onto the protected LSP in response to receiving the second labeled packet. | 08-25-2011 |
| 20110211440 | METHODS AND SYSTEMS FOR ENABLING END-USER EQUIPMENT AT AN END-USER PREMISE TO EFFECT COMMUNICATIONS HAVING CERTAIN DESTINATIONS WHEN AN ABILITY OF THE END-USER EQUIPMENT TO COMMUNICATE VIA A COMMUNICATION LINK CONNECTING THE END-USER EQUIPMENT TO A COMMUNICATIONS NETWORK IS DISRUPTED - A method for effecting communications, such as telephone calls, accesses to data network sites (e.g., web sites), alarm system communications, and/or other communications, having certain destinations over a communications network. The method comprises: receiving a request for a communication originated by first end-user equipment at a first end-user premise when an ability of the first end-user equipment to communicate via a first communication link connecting the first end-user equipment to the communications network is disrupted; determining, based on a destination of the communication, that the communication is to be effected over the communications network; and causing information pertaining to the communication to be exchanged between the first end-user equipment and the communications network via a wireless communication link established between the first end-user equipment and second end-user equipment at a second end-user premise and a second communication link connecting the second end-user equipment to the communications network. Also provided are apparatus and computer-readable media containing a program element executable by a computing system to perform such a method. | 09-01-2011 |
| 20110211441 | SEQUENTIAL HEARTBEAT PACKET ARRANGEMENT AND METHODS THEREOF - An arrangement in a network tap for monitoring state of a monitoring system is provided. The arrangement includes a set of network ports that includes a set of input network ports for receiving data traffic and a set of output network ports for outputting the data traffic from the network tap. The arrangement also includes a monitoring port that is configured to receive the data traffic from the set of network ports and to forward the data traffic onward to the monitoring system. The arrangement further includes a logic component configured for executing a sequential heartbeat diagnostic test. The sequential heartbeat diagnostic test is configured for providing a first set of sequential heartbeat packets for testing and determining the state of the monitoring system. The arrangement yet also includes a logic component for activating one or more events when a failure condition exists for the state of the monitoring system. | 09-01-2011 |
| 20110211442 | VIRTUAL ROUTER WITH A PRIORITY VALUE PER PORT - A virtual router spans a number of physical routing devices. A set of physical ports on one of the physical routing devices is logically represented as a trunk. A respective port priority value is associated with each of those ports, and a device priority value is associated with the physical routing device. If a port in the trunk is out-of-service, then the device priority value can be adjusted by the port priority value associated with the out-of-service port. A corrective action can be implemented if the device priority value fails to satisfy a condition. For example, the physical routing device may failover to another one of the physical routing devices spanned by the virtual router. | 09-01-2011 |
| 20110222394 | FABRIC EXTRA TRAFFIC - A method of forwarding traffic through a network node including an ingress IO card, an egress IO card, and a pair of parallel switch fabric cards. One of the switch fabric cards is designated as a working switch fabric card, and the other one of the switch fabric cards is designated as a protection switch fabric card. In the ingress IO card, the traffic flow is divided into a committed information rate (CIR) component and an extra information rate (EIR) signal. Under a normal operating condition of the node, the ingress IO card forwards the CIR traffic component through the working switch fabric card, and forwards the EIR traffic component through the protection switch fabric card. Upon detection of a failure impacting the working switch fabric card, the ingress IO card drops the EIR traffic component and forwards the CIR traffic component through the protection switch fabric card. | 09-15-2011 |
| 20110222395 | DUAL PORT ETHERNET COMMUNICATION DEVICE WITH BYPASS FUNCTION - Provided is a dual port Ethernet communication device which allows data received via any one communication port to be bypassed to other communication port. Since the Ethernet communication device performs such bypass operation itself, the communication data can be kept transferred to other terminal unit even though the terminal unit equipped with the Ethernet communication device does not operate normally due to causes such as a break down. In particular, if it is used in each terminal unit forming a closed loop in a closed loop power system, the communication on the closed loop remains such that the adjacent terminal unit can perform backup interrupt function even though a failure happens in a specific terminal unit forming the closed loop. | 09-15-2011 |
| 20110228668 | METHOD AND SYSTEM FOR AUTOMATIC FAILOVER OF DISTRIBUTED QUERY PROCESSING USING DISTRIBUTED SHARED MEMORY - A method and system for implementing automatic recovery from failure of resources in a grid-based distributed database is provided. The method includes determining the category of each node in the subgroup of nodes, where the determination identifies each node as at least one of a worker node and an idle node. The method further includes saving state of each worker node engaged in execution of a task in a shared memory at pre-determined time intervals. Each worker node is monitored by one or more idle nodes in each sub-group. Upon detection of no change in state of worker node for a pre-determined period of time, a failure notification is raised by one or more idle nodes that have detected failure of the worker node. | 09-22-2011 |
| 20110235502 | COMMUNICATION RELAY DEVICE, COMMUNICATION RELAY METHOD, AND STORAGE MEDIUM HAVING COMMUNICATION RELAY PROGRAM STORED THEREIN - A relay device performing wireless communication with a wireless communication device to relay communication between the wireless communication device and another communication device. First and second relay modes of the relay device each include a set of communication parameters for relaying communication via respective first and second communication paths. The relay device includes a communication failure determination section for determining, whether there is a communication failure in the first communication path, and a relay mode controlling section for enabling the first relay mode and disenabling the second relay mode when there is no communication failure in the first communication path, and disenabling the first relay mode and enabling the second relay mode when there is a communication failure in the first communication path. A communication control section controls communication based on either the first relay mode or the second relay mode that is enabled by the relay mode controlling section. | 09-29-2011 |
| 20110261680 | GEOGRAPHIC REDUNDANCY FOR CALL SERVERS IN A CELLULAR SYSTEM BASED ON A BEARER-INDEPENDENT CORE NETWORK - In a bearer-independent core network, the switching and transport of the bearer streams is separated from the processing of call sessions that control the bearer streams. The switching and transport of the bearer streams is executed by media gateways and packet switches in the switching and transport layer of the network. The processing of calls sessions that control the bearer streams is executed by call servers in the call control layer of the network. The switching and transport layer of the network may be implemented using ATM or IP technology. In order to redirect the signaling links to a backup call server, a signaling gateway is used. Each media gateway includes a signaling gateway function. The signaling gateways redirect the signaling links by encapsulating each signaling message in a new packet in one embodiment. | 10-27-2011 |
| 20110280119 | METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR AUTOMATIC, PEER NODE TRANSPARENT REHOMING OF TIME DIVISION MULTIPLEXED (TDM)-BASED SIGNALING CHANNELS IN AN X USER ADAPTATION (XUA) SIGNALING GATEWAY - The subject matter described herein includes methods, systems and computer readable media for automatic, peer node transparent re-homing of time division multiplexed (TDM)-based signaling channels in an X user adaptation (XUA) signaling gateway. One exemplary method includes providing an XUA SG having a plurality of SG cards, a plurality of TDM network interface cards (NICs) and a plurality of packet NICs, and a switching matrix connecting the TDM NICs and the XUA SG cards. The method further includes configuring the switching matrix so that a first XUA SG card terminates a set of TDM-based signaling channels. The method further includes switching the set of TDM-based signaling channels from one of the TDM NICs to the first XUA SG card. The method further includes switching the set of TOM-based signaling channels, detecting failure of the first XUA SG card, and automatically reconfiguring the TDM switching matrix so that the set of TDM-based signaling channels is sent to a second XUA SG card of the plurality of XUA SG cards. | 11-17-2011 |
| 20110286323 | DEVICE AND SYSTEM FOR PROTECTION SWITCHING - A unit and a system for protection switching of line cards in a telecommunication system are described. A protection unit is connectable between communication lines and a line interface unit. The protection unit can be interconnected with other protection units to form a protection switching system. One protection unit in the protection switching system is connectable to a stand-by line card. The protection switching system is configured so that when protection switching is needed, the line signal is re-directed between the communication line for a failed line card and the stand-by line card via electrical connection elements. | 11-24-2011 |
| 20110317548 | METHOD OF AND DEVICE FOR RECOVERING FROM A ROOT BRIDGE FAILURE - An active loop-free topology established by a Rapid Spanning Tree Algorithm and Protocol (RSTP) emanates from an original root bridge. Upon a bridge directly connected to the root bridge suspecting a failure in the root bridge, the bridge directly connected to the root bridge generates a Root Failure Suspicion Notification (RFSN) Bridge Protocol Data Unit (BPDU) comprising a standard Rapid Spanning Tree (RSTP) BPDU portion and a compressed failed root identifier portion uniquely identifying the root bridge which is suspected of failing. The RFSN BPDU is propagated amongst the bridges in the network. The bridges which can identify a flag in the standard RSTP BPDU portion of the RFSN BPDU decompress the compressed failed root identifier and compare it to the stored root identifier at each bridge. If the received failed root identifier in the RFSN BPDU corresponds to the stored root identifier of the bridge, the bridge deletes the stored root identifier. The bridge then commences a time out during which, if further RFSN BPDUs are received, only the BPDU portion is acted on and the failed root identifier portion is ignored. The RSTP BPDU portion is acted on in the standard way pursuant to the RSTP protocol whether or not the bridge can also identify the flag or the compressed failed root identifier in the RFSN BPDU. Conversion to a new active topology is facilitated by deleting the original root bridge identifier which is suspected of failure from the memory of the bridges. | 12-29-2011 |
| 20120002536 | INTERFERENCE MITIGATION AND ADAPTIVE ROUTING IN WIRELESS AD-HOC PACKET-SWITCHED NETWORKS - Described are an apparatus and method for routing packets through a multiple-hop wireless communications network. Interference with packet switched communications carried by radio frequency (RF) over the multiple-hop wireless communications network is detected. In response to information related to the detected interference, a route is adaptively determined for transmitting packets through the multiple-hop wireless communications network that mitigates the effect of the interference on the packets. | 01-05-2012 |
| 20120020204 | PUBLIC LAND MOBILE NETWORK SELECTION PROCEDURES FOR SIMULTANEOUS NETWORK CONNECTIVITY THROUGH MULTIPLE ACCESSES - A system and method for network selection procedures for simultaneous network connectivity through multiple accesses comprises obtaining stored and registered PLMNs, determining whether PLMNs are both stored PLMN for access technology type Ai and registered PLMN, when no PLMNs are both, performing PLMN selection using a standard procedure, when only one PLMN is both, determining whether the PLMN satisfies a condition, and when the PLMN satisfies the condition, attempting to connect to the PLMN, and when more than one PLMN is both, creating a set of PLMNs, selecting one PLMN that satisfies the condition, from the set PLMN, attempting to connect to the selected PLMN, and when attempting to connect fails, removing the selected PLMN from the set, and selecting another PLMN. In one aspect, the PLMN that minimizes changes is selected. In one aspect, the PLMN that provides access to a larger number of access technologies is selected. | 01-26-2012 |
| 20120020205 | PROTECTING CONNECTION TRAFFIC USING FILTERS - A connection between network nodes in a communication network is backed up. A failover switched path such as a label-switched path (LSP) is created starting at a first network node of a connection and ending at the second node of the connection, while bypassing the protected connection. In the event of connection failure, data is transmitted through the failover switched path (e.g., LSP). A network operator can selectively protect different types of data by using filters that bind one or more types of traffic received over one or more interfaces to different failover switched paths (LSPs). | 01-26-2012 |
| 20120020206 | Method for Client Data Transmission Through a Packet Switched Provider Network - In order to provide a redundancy mechanism in a packet switched provider network, which allows faster recovery from a failure, it is proposed that in case of a failure, a redundancy mechanism is initiated to reroute packet transmission through the provider network via an alternate path and an address withdrawal message is sent to network nodes along the failed path using data plane protocol. A network node receiving the address withdrawal message will flush MAC addresses it had learned before. | 01-26-2012 |
| 20120033541 | SYSTEM AND METHOD FOR TRANSPORT CONTROL PROTOCOL IN A MULTI-CHASSIS DOMAIN - Aggregation switches connected to an edge node by a multi-chassis link aggregation group, wherein the aggregation switches are connected by a virtual fiber link that provides a connection for exchange of information between the Aggregation Switches regarding MAC addressing to synchronize MAC address tables. A transport control protocol defines a VLAN and multicast group of ports on the Aggregation Switch to receive management or control packets. | 02-09-2012 |
| 20120033542 | TECHNIQUES FOR DETERMINING LOCAL REPAIR CONNECTIONS - Techniques for configuring a local repair connection for a protected connection including determining a path for the local repair connection. The path traversed by a local repair connection starts at a node in the path associated with the protected connection and ends at a merge point node in the path associated with the protected connection that is downstream from the start node. In one embodiment, the merge point node may even be more than two hops downstream from the start node in the path associated with the protected connection. The local repair path may include zero or more nodes that are not included in the path associated with the protected connection. Techniques are also described for optimizing the path associated with a local repair connection. | 02-09-2012 |
| 20120039163 | COMMUNICATION NETWORK CONTROL SYSTEM AND CONTROL METHOD - In a case where a failure has occurred in one of fabric management mechanisms, nodes resume data I/O communications without degrading performance and without changing the data I/O communication path between the nodes by switching control to the other one of the fabric management mechanisms. The fabric management mechanisms share management information with each other. When a failure occurs in either of the fabric management mechanisms, an E_Node that belongs to the domain, in which a failure has occurred, logs into a normal fabric management mechanism via a newly created management-use communication path. The normal fabric management mechanism allocates an N_Port_ID on the basis of a virtual FC domain number that has been allocated to a switch. | 02-16-2012 |
| 20120039164 | System And Method Of Implementing Lightweight Not-Via IP Fast Reroutes In A Telecommunications Network - A system, method, and node for implementing lightweight Not-via Internet Protocol fast reroutes of a packet in a telecommunications network between a first node and a destination node. The method determines a shortest path between the first node and the destination node and two redundant trees between the first node and the destination node. Each redundant tree provides an alternate path from the first node and the destination node. When a failure in a link between the first node and the destination node is detected, the packet is forwarded to the destination node via a first redundant tree, and if not available, via a second redundant tree. If the second redundant tree is not available, the packet is dropped. If no failure in the link between the first node and the destination node is detected, the packet is sent via the determined shortest path to the destination node. | 02-16-2012 |
| 20120044799 | METHOD AND APPARATUS OF IMPLEMENTING AN INTERNET PROTOCOL SIGNALING CONCENTRATOR - Communication between base station controllers and a mobile switching center may be provided by a consolidating device that operates between the BSCs and the MSCs. One example method of operation may include initiating an active process on an active network device and a standby process on a redundant network device configured as a backup to the active network device. Other operations may include receiving a data message from at least one base station controller on the active network device, and detecting a communication failure by at least one of the active process and the standby process, in response to the received data message. Other operations may include automatically configuring the redundant network device to become the active network device. | 02-23-2012 |
| 20120044800 | PROTECTION OF USER DATA TRANSMISSION THROUGH A TRANSPORT NETWORK - It is disclosed a method for protecting transmission of user data transmitted from a first to a second user network through a transport network. The user data have a maximum transmission rate. The method comprises: in the transport network, in a failure-free status, providing a first and a second path having an overall capacity equal to the maximum transmission rate; transmitting a first portion of user data along the first path, and a second portion of user data along the second path; at a network management server cooperating with the transport network, detecting a failure affecting transmission of the second portion; at the network management server, switching from the failure-free status to a failure status by operating the transport network so as to increase capacity of the first path to the maximum transmission rate; and at the first user network, transmitting the user data along the first path only. | 02-23-2012 |
| 20120044801 | TECHNIQUE FOR DETERMINING WHETHER TO REESTABLISH FAST REROUTED PRIMARY TUNNELS BASED ON BACKUP TUNNEL PATH QUALITY FEEDBACK - In one embodiment, a primary tunnel is established from a head-end node to a destination along a path including one or more protected network elements for which a fast reroute path is available to pass traffic around the one or more network elements in the event of their failure. A first path quality measures path quality prior to failure of the one or more protected network elements. A second path quality measures path quality subsequent to failure of the one or more protected network elements, while the fast reroute path is being used to pass traffic of the primary tunnel. A determination is made whether to reestablish the primary tunnel over a new path that does not include the one or more failed protected network elements, or to continue to utilize the path with the fast reroute path, in response to a difference between the first path quality and the second path quality. | 02-23-2012 |
| 20120069729 | IMPLEMENTING LANE SHUFFLE FOR FAULT-TOLERANT COMMUNICATION LINKS - A method and circuit for implementing lane shuffle for fault-tolerant communication links, and a design structure on which the subject circuit resides are provided. Shuffle hardware logic steers a set of virtual data lanes onto a set of physical optical lanes, steering around all lanes that are detected as bad during link initialization training. A mask status register is loaded with a mask of lane fail information during link training, which flags the bad lanes, if any. The shuffle hardware logic uses a shift template, where each position in the starting template is a value representing the corresponding lane position. The shift template is cascaded through a set of shifters controlled by the fail mask. | 03-22-2012 |
| 20120087232 | LINK STATE RELAY FOR PHYSICAL LAYER EMULATION - One embodiment of the present invention provides a fault-management system. During operation, the system identifies a failure at a remote location associated with a communication service. The system then determines a local port used for the communication service, and suspends the local port, thereby allowing the failure to be detected by a device coupled to the local port. | 04-12-2012 |
| 20120087233 | Address Refresh Method and System - A method and a system for refreshing addresses are disclosed. Said method includes: when state switching between a link fault and a fault recovery occurs in a link, a node where a port related to this link is situated refreshing an address forwarding list, and configuring a flag PF for suspending an operation of refreshing an address forwarding list on other ports of this node, and sending protocol message with address refreshing information to other nodes; and when ports of other nodes receive said protocol message, refreshing the address forwarding list only when identifier information included in this protocol message is inconsistent with identifier information stored in this port and this port is not configured with said PF flag. Said method and system judge whether to refresh the address forwarding list according to said PF flag, and determine whether to refresh the address forwarding list according to the judgment result. | 04-12-2012 |
| 20120092983 | METHOD AND DEVICE FOR CLASSIFYING MEDIA ACCESS CONTROL ADDRESS BASED ON ETHERNET RING NETWORK - The present invention provides a method for classifying media access control (MAC) address based on Ethernet ring network, and the method comprises: the Ethernet ring network carry out initialization; a ring node classifies the MAC address corresponding to a non-ring port in its own forward database (FDB) into a MAC address group, and takes its own MAC address as the index of the MAC address group; a ring node broadcasts a message carrying the MAC address group indexed by its own MAC address in the Ethernet ring network; the ring node receiving the message completes the classification of the MAC address corresponding to the ring port in its own FDB by adding the MAC address group carried by the message into its own FDB. The present invention also provides a device for classifying media access control (MAC) address based on Ethernet ring network. | 04-19-2012 |
| 20120099420 | EFFICIENT CONVERGENCE OF GROUPED VPN PREFIXES - In one embodiment, a list of border node next hop options is maintained in a memory. The list of border node next hop options includes one or more of border nodes that may be utilized to reach one or more prefixes. An index value is associated with each border node of the list of border node next hop options. A list of labels is also maintained in the memory. The index value of each border node is associated with a corresponding label for a path to reach that border node. When a change to the one or more border nodes is detected, the list of border node next hop options is updated to remove a border node. However, a label for the path to reach the border node is maintained in the list of labels for at least a period of time. | 04-26-2012 |
| 20120106320 | ROUTED SPLIT MULTI-LINK TRUNKING RESILIENCY FOR WIRELESS LOCAL AREA NETWORK SPLIT-PLANE ENVIRONMENTS - A method, apparatus and computer program product for performing Routed Split Multi-Link Trunking Resiliency for Wireless Local Area Network split-plane environments is presented. A first network switch learns first data associated with a second network switch and the first network switch terminates an Access Tunnel (AT). The said second network switch learns second data associated with said first network switch. The first and second data are synchronized between the first network switch and the second network switch. The first network switch and the second network load sharing tunnel data packets. The second network switch forwards tunnel control packets received by the second network switch to the first network. A failure relating to said first network switch is detected and a new AT is established with the second network switch. | 05-03-2012 |
| 20120113799 | SYSTEM AND METHOD OF ACTIVE/STANDBY PROTECTION FOR USER-SIDE MULTICAST SERVICES AND ROUTING DEVICE - The present invention relates to a routing device. The routing device and at least one second routing device are both connected to a convergence device. The routing device is an active device and includes a user information synchronizing backup module configured to synchronize multicast service user information to the at least one second routing device in real time through the convergence device. In the present invention, an active routing device and a standby routing device are configured on the user-side, and user information is synchronized to the standby routing device in real time. Therefore, upon active/standby switching, user identification and authentication are not affected, whereby the validity of user traffic and channel is ensured. Furthermore, economic benefits of an operator are guaranteed. Moreover, with the present invention, switching speed is accelerated, service continuity is ensured, and Quality of Experience of a user is improved. | 05-10-2012 |
| 20120127853 | NETWORK RELAY SYSTEM AND METHOD OF CONTROLLING A NETWORK RELAY SYSTEM - A network relay system ( | 05-24-2012 |
| 20120147735 | Method and Apparatus for a Ring Network Node to Acquire Protocol Messages - The present invention provides a method and an apparatus for acquiring protocol messages by a ring-network node, including: using dual fields to identify different protocol messages; if a node supporting G.8032v1 receives a Force Switch (FS) or Manual Switch (MS) protocol message, determining that message is a Signal Fail (SF) protocol message according to an identifier; a node supporting G.8032v2 determining that the received protocol message is an SF or MS or FS protocol message according to the identifier. The method of the present invention enables the nodes in a ring network to accurately control the state of their own ports, thereby avoiding the case that multiple blocking points appear in the ring network and improving the network performance. | 06-14-2012 |
| 20120155246 | Method and System for Blocking Protocol Messages at a Sub-Ring Control Channel without Virtual Channel - The present invention provides a method for blocking a protocol message at a Sub-ring control channel without a virtual channel, for avoiding the problem that the Sub-ring is in a continuous refresh state all the time caused by the existing solution of the Sub-ring control channel without the virtual channel, and the method includes: blocking forwarding of relevant messages when a forced switch is initiated or a failure is detected. | 06-21-2012 |
| 20120170446 | Method and Inquiring Device for Implementing Switching in Network Fault - A method for implementing switching when the network is faulted is disclosed, and the method includes: establishing a quick detection mechanism between non-querier and querier; the non-querier using the detection mechanism for performing a real-time detection on the querier and downlink of the querier; switching the non-querier to be the querier when the non-querier detects that the querier or the downlink of the querier is faulted. A querier is further disclosed. With the method, it can complete a quick switching of the querier and a quick transmission of a multicast flow when the querier or the downlink thereof is faulted, thereby reducing the interrupt time of users receiving the multicast flow, implementing a quick protection of a multicast service, and improving the service experience for the user. | 07-05-2012 |
| 20120176889 | NETWORK FAILOVER PROTECTION - Embodiments generally disclosed herein include a computer-implemented method for providing network failover functionality. The method includes providing service over a transport network from a first customer location to a second customer location. The method further includes detecting a network failure in the transport network and, in response, provisioning service over an Internet Protocol (IP) transit network from the first customer location to the second customer location. In one example embodiment, the network failure can be caused by a link failure in the transport network. In another example embodiment, the network failure can be used by a node failure in the transport network (e.g., failure of a dense wavelength division multiplexing device). | 07-12-2012 |
| 20120182861 | METHOD AND MEANS FOR STATE TRANSITION OF ETHERNET LINEAR PROTECTION SWITCHING - The present invention relates to state transition, especially relates to method and means for state transition of Ethernet linear protection switching. It is provided a method of state transition for a local end of a protection group of Ethernet linear protection switching in a local network element, and the method comprises receiving a first message configured to change the state of the local end with a first state, the first message being overridden by the first state; receiving a second message configured to change the state of the local end; determining a second state of the local end on the basis of the first message and the second message; and changing the state of the local end into the second state. In this way, there will be no unnecessary state transition and then no traffic loss caused by the unnecessary state transition. | 07-19-2012 |
| 20120188866 | COMMUNICATION CONTROL APPARATUS AND COMMUNICATION CONTROL METHOD - A communication control apparatus includes a storage unit and a processor. The storage unit stores, in association with a port number, first address information regarding apparatuses connected to a port identified by the port number. The processor receives a first affected address list containing second address information regarding apparatuses which may be affected by a trouble, extracts the first address information stored in the storage unit in association with a port number of a port via which the first affected address list has been received, selects third address information which is included in both the first and second address information, updates the first affected address list by replacing the second address information with the third address information to acquire a second affected address list, and transmits the second affected address list via each port other than the port via which the first affected address list has been received. | 07-26-2012 |
| 20120195186 | METHOD AND SYSTEM FOR PREVENTING TRAFFIC LOSS CAUSED BY WAIT-TO-RESTORE MECHANISMS IN SERVICE PROTECTION NETWORKS - A method for preventing traffic loss includes transmitting user traffic over an automatic protection switching (“APS”) connection with revertive operation between a first switch and a second switch, determining that the working path on the APS connection has failed, moving user traffic to the protect path of the APS connection, and initiating a wait-to-restore mode including a wait-to-restore time period associated with the first switch. The method also includes, upon termination of the wait-to-restore time period of the first switch, maintaining traffic on the protect path until a message designating the working path is received on the protect path. The method further includes, upon receiving a message designating the working path, switching user traffic to the working path. The APS connection includes the protect path and the working path. | 08-02-2012 |
| 20120201122 | MULTI-POINT AND ROOTED MULTI-POINT PROTECTION SWITCHING - The present invention relates to techniques for allowing one or more edge nodes in a backbone network to quickly and efficiently switch traffic delivery from a first virtual network to a second virtual network in response to a failure occurring in association with the first virtual network. In certain embodiments, an edge node is capable of independently detecting that a failure has occurred on the first virtual network and quickly transitioning from the first virtual network to the second virtual network for receiving or delivering traffic. Upon detecting the failure in the first virtual network, the edge node will begin delivering traffic over the second virtual network. If control messages are not already being provided over the second network, the edge node may begin providing the control messages over the second virtual network. | 08-09-2012 |
| 20120230181 | Aircraft Communication Bus Fault Isolator Apparatus and Method - A structure and a first panel are operably disposed with respect to the structure. A first plurality of nodes is disposed within the first panel, including a first plurality of power distribution network nodes in a first power distribution network, and wherein the first plurality of nodes further comprises a first group of nodes. A second panel is operably disposed with respect to the structure. A second plurality of nodes is disposed within the second panel, including a second plurality of power distribution network nodes in a second power distribution network isolated from the first power distribution network. The second plurality of nodes further comprises a second group of nodes. A bus guardian, separate from the two panels, electrically connects the first panel and the second panel. The bus guardian is configured to network the first group of nodes and the second group of nodes in a network. | 09-13-2012 |
| 20120230182 | GLOBAL PORTS IN MULTI-SWITCH SYSTEMS - Global ports are supported in multi-switch systems having arbitrary topologies. In some implementations, global ports are implemented in a manner which makes the switch system robust in the face of link failure. In specific Ethernet implementations, global ports enable flooding, learning, forwarding, and link aggregation across the switch system. | 09-13-2012 |
| 20120236707 | Method and Arrangement for Managing Radio Link Failure - In a method of managing radio link failure based on the RRC protocol in a user equipment node communicating over a radio link with a radio base station node in a wireless communication system, the user equipment node detecting (S | 09-20-2012 |
| 20120243403 | ADDRESSING METHOD, ADDRESSING APPARATUS, FABRIC MANAGER, SWITCH, AND DATA ROUTING METHOD - The present disclosure provides an addressing method, an addressing apparatus, a fabric manager, a switch, and a data routing method for data center networks. The addressing apparatus includes a tree creating unit for, sequentially with each of switches as a root, creating a tree containing all hosts by means of network topology discovery function, to obtain a plurality of trees; a tree selecting unit for selecting a tree having a minimum height among the created plurality of trees; and an address assigning unit for assigning addresses to each of switches and each of hosts in a network with respect to each selected tree having a minimum height. The present disclosure is adaptable to various topologies employed by the data center. The present disclosure can achieve aggregation of locator addresses so that a forwarding table can be shortened, and can achieve load balance of the network. | 09-27-2012 |
| 20120275295 | BANDWIDTH GUARANTEED SYSTEM, RADIO NODE DEVICE AND BANDWIDTH GUARANTEEING METHOD - To establish an alternative path without giving an influence on signal continuity to a data transmission line to which a communication bandwidth cannot be secured any more when the transmission capacity decreased by adaptive modulation. | 11-01-2012 |
| 20120281522 | Synchronizing Sequence Numbers - Systems and methods are disclosed for synchronizing sequence numbers in a packet flow. One such method includes receiving a sequence number synchronization request from a redundancy peer. The sequence number synchronization request is associated with a packet flow. The method also includes incrementing by a fixed amount a packet sequence number for the packet flow, after the sequence number synchronization request. The method also includes transmitting a next packet including the incremented packet sequence number to the communication peer. | 11-08-2012 |
| 20120281523 | METHOD AND APPARATUS FOR COORDINATING FAULT RECOVERY TECHNIQUES AMONG DOMAINS - In a telecommunications/data network, it is common to have multiple recovery domains each employing its own technique for recovering a fault that may be different from a technique employed by another domain. Permitting multiple recovery domains to recover a fault without coordination among the domains can result in adverse interactions, such as rapid and repeated changes in the actions taken or “flapping,” and repeated hits to traffic. A method and corresponding apparatus for coordinating fault recovery in a network, according to an embodiment of the present invention, notifies a first recovery domain that a second recovery domain is or is not taking action to recover a fault in the network. Coordinating the recovery efforts of the first and second recovery domains reduces fault recovery time and allows concurrent actions to be taken. | 11-08-2012 |
| 20120287776 | NETWORK, NETWORK FAULT RECOVERY METHOD, AND NODE DEVICE - A ring network of a multicast label switch path scheme includes a plurality of nodes connected to form a ring. Further, a signal input to a first one of the nodes is branched to be transmitted in first and second different directions to a second and a third one of the nodes through a first working path and a second working path, respectively, in the ring network, the second one and the third one of the nodes defining end points of the first working path and the second working path, respectively, from the first one of the nodes, and a first backup path is set from the second one of the nodes to the first one of the nodes in the first direction, and a second back up path is set from the third one of the nodes to the first one of the nodes in the second direction. | 11-15-2012 |
| 20120327762 | METHOD FOR SUPPORTING MPLS TRANSPORT PATH RECOVERY WITH MULTIPLE PROTECTION ENTITIES - A system and method for selecting MPLS network transport entities between a first endpoint and a second endpoint are presented. Working and protection entities are selected from a set of available entities based upon minimizing the probability of simultaneous failure and/or minimizing a cost function base upon one or more metrics. | 12-27-2012 |
| 20120327763 | PREVENTING UPPER LAYER RENEGOTIATIONS BY MAKING PPP AWARE OF LAYER ONE SWITCHOVERS - A method may include establishing a first Point-to-Point Protocol (PPP) session on an interface, receiving an indication of a layer one failure, omitting for a period of time, an indication that the first PPP session on the interface is down, based on the indication of the layer one failure, establishing a layer one switchover to another interface based on the indication of the layer one failure, and attempting during the period of time, to establish a second PPP session on the other interface. | 12-27-2012 |
| 20130003527 | METHOD, ACCESS LAYER DEVICE, AND SYSTEM FOR IMPLEMENTING MULTICAST IN RING NETWORK ARCHITECTURE - The present invention provides a method for implementing multicast in a ring network architecture. The ring network architecture includes a first aggregation layer device, a second aggregation layer device, a first access layer device connected to the first aggregation layer device, and a second access layer device connected to the second aggregation layer device. The first aggregation layer device is connected to the second aggregation layer device; the first access layer device is connected to the second access layer device. The method includes: setting the first access layer device and the second access layer device as root bridges; reducing a bridge priority of the first access layer device when a fault occurs on a link between the first aggregation layer device and the first access layer device, calculating a root port RP of the first access layer device through the STP, and sending a multicast Join packet through the RP. | 01-03-2013 |
| 20130028070 | METHOD AND APPARATUS FOR RESILIENT ROUTING OF CONTROL TRAFFIC IN A SPLIT-ARCHITECTURE SYSTEM - The invention is a routing algorithm characteristic that minimizes the weight, meaning that the probability that a node is disconnected from the controller in case of a failure in the network is minimized. The first algorithm used in the invention is an approximation algorithm for finding the controller routing tree that provides maximum resilience in the network. The algorithm is referred to herein as the Maximum Resilience (MR) algorithm. The heuristic MR algorithm selects a shortest-path tree as a starting point and modifies the tree in order to improve resilience. The output of the MR algorithm is not necessarily a shortest-path tree, but provides more resilience compared to the initial tree. The RASP algorithm provides a shortest-path tree with improved network resilience compared to other possible shortest-path trees. | 01-31-2013 |
| 20130028071 | IN-BAND SIGNALING FOR POINT-MULTIPOINT PACKET PROTECTION SWITCHING - A method and system provide in-band protection switch signaling in a communication system arranged as a point-to-multipoint tree. The point-to-multipoint tree includes a root node communicatively coupled to a plurality of leaf nodes through both a working link and a protection link. Data is transferred through a current link of the point-to-multipoint tree. The current link is either the working link or the protection link. A fault is detected in the current link in the point-to-multipoint tree. Each leaf node in the point-to-multipoint tree is notified of the fault using the current link. Upon receiving the notification, the root node and each leaf node switch to the other link of the working link and the protection link. | 01-31-2013 |
| 20130051216 | Techniques for Recovery of Wireless Services Following Power Failures - Techniques for managing a wireless network when disruptive events occur are provided. In one aspect, a method for managing a heterogeneous wireless network having at least two classes of nodes is provided. The method includes the following steps. One or more network signaling activities are observed. If the network signaling activities exhibit a behavior that is associated with a power failure affecting at least one of the classes of nodes, network resources for transmission and processing of network signaling associated with one or more other of the classes of nodes are adjusted to accommodate the behavior. | 02-28-2013 |
| 20130051217 | SYSTEM AND METHOD FOR ENHANCING LOOP FREE ALTERNATIVE COVERAGE - An approach is provided for improving network restoration by enhancing loop free alternative coverage. A loop-free alternate (LFA) procedure is initiated for a failed link of a network including a plurality of nodes. A state of incomplete loop-free alternate coverage for the nodes is determined. A shortest path in the network exclusive of the nodes associated with the failed link is determined. Each node along the determined shortest path is set as an explicit route object to create a bypass label switched path for the network. | 02-28-2013 |
| 20130058208 | FAULT TOLERANT MANAGED SWITCHING ELEMENT ARCHITECTURE - In a hierarchical switching architecture that includes at least one lower level managed switching element that connects to several higher level managed switching elements, some embodiments provide a method of identifying a higher level managed switching element to which the lower level managed switching element forwards a packet for further processing. The method computes a distribution metric based on a set of attributes of the packet. The method performs a lookup on a hierarchy traversal table that specifies (1) a set of primary higher level managed switching elements and (2) a set of secondary higher level managed switching element. The lookup is for determining a higher level managed switching element specified in the hierarchical traversal table to forward the packet for further processing. The method forwards the packet to the determined higher level managed switching element. | 03-07-2013 |
| 20130088952 | Multiple-Fault-Tolerant Ethernet Network for Industrial Control - Fault-tolerant Ethernet is provided through the use of special interfaces providing end-devices with duplicate ports that may be alternatively enabled with the same network address in the event of a fault detected by loss of the message from a beacon device. Unidirectional network errors in the direction from the end-device to the beacon devices are detected through a path check message from the end-device to the beacon device. Multiple faults may be accommodated without network interruption by adding top-level switches without increasing the number of ports on the end-devices by cross connecting a lowest level of switch. | 04-11-2013 |
| 20130094350 | Semi-Centralized Routing - Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for semi-centralized routing. In one aspect, a computer-implemented method receives a network protocol packet at a router adapted for routing data packets to one or more additional routers. The network protocol packet conforms to a routing protocol that provides distributed routing computation. The method also sends the network protocol packet, through a controller, to a selected one of a plurality of route control servers. The method also processes the network control packet at the selected route control server to generate a routing computation result that conforms to the routing protocol. The method also generates routing information based on the routing computation. The routing information conforms to a control protocol that provides centralized routing computation. The method also sends the routing information to the router for routing of data packets based on the control protocol. | 04-18-2013 |
| 20130094351 | REDUCING IMPACT OF A SWITCH FAILURE IN A SWITCH FABRIC VIA SWITCH CARDS - Techniques are disclosed for reducing impact of a switch failure in a switch fabric. In one embodiment, a server system is provided that includes a midplane, one or more server cards and one or more switch cards. The midplane may include a fabric interconnect for a switch fabric. The one or more server cards may be coupled with the midplane, where each server card is hot-swappable from the midplane. The one or more switch cards may also be coupled with the midplane, where each switch card is also hot-swappable from the midplane. Each switch card includes one or more switch modules, and each switch module is configured to switch network traffic for at least one server card. | 04-18-2013 |
| 20130107697 | Network Connection System of Network Electronic Device and Method to Solve Terminal Device Unable to Reach Electronic Device Caused by Router Not Supporting NAT Loopback | 05-02-2013 |
| 20130121136 | MOBILE TERMINAL AND FAILURE RECOVERY METHOD THEREOF - A mobile terminal and failure recovery method thereof, wherein the method comprises: a wireless MODEM receives failure recovery triggering information, in the case that an AP cannot work normally; the MODEM acquires control to peripherals of the mobile terminal; the MODEM sends failure information to the network side; the MODEM receives failure recovery information returned from the network side, in order for the mobile terminal to recover the failure according to the failure recovery information. The method and mobile terminal in the embodiments of the present invention are simple and can avoid the loss of user data. | 05-16-2013 |
| 20130128718 | Fast Designated Router Transitions in Broadcast Networks for Link State Protocols - A method, apparatus and computer program product for providing quick designated router transitions in broadcast networks is presented. An Alternate Designated Router (ADR) in a network detects node failure of a Designated Router (DR) prior to other nodes of the network detecting the failure of the DR. In response to the detecting node failure of the DR, the ADR floods the network with a link state packet of a pseudonode within the network. At least one other node of the network detects failure of the DR. The at least one other node computes routes to take into account the failure of the DR by the at least one other node of the network, wherein there is minimal traffic loss since the pseudonodes link state packet is already present before the computing routes takes place. | 05-23-2013 |
| 20130128719 | Controlling Multicast Source Selection in an Anycast Source Audio/Video Network - Particular embodiments of the disclosed subject matter provide methods and systems to support a multicast source selection system. In an example embodiment, the system includes a network element in data communication with a network, the network element being operable to: receive a request for withdrawal of a server as a source of a multicast data stream; and propagate information to the network indicating withdrawal of the server as a source of the multicast data stream, the propagation of information by the network element being responsive to the request for withdrawal of the server as a source of the multicast data stream. | 05-23-2013 |
| 20130148491 | METHOD AND SYSTEM FOR EXTENDING ROUTING DOMAIN TO NON-ROUTING END STATIONS - A system is provided for facilitating assignment of a virtual routing node identifier to a non-routing node. During operation, the system assigns to a non-routing node coupled to a switch a virtual routing node identifier unique to the non-routing node. In addition, the system communicates reachability information corresponding to the virtual routing node identifier to other switches in the network. | 06-13-2013 |
| 20130155840 | Bandwidth management for MPLS fast rerouting - Certain exemplary embodiments provide a method comprising: in a network at a node located on a label switched path: selecting a backup path to respond to a failure; and for each link along the backup path, reserving a backup bandwidth, wherein the backup bandwidth is sufficient to reroute traffic around the failure. | 06-20-2013 |
| 20130163407 | SYSTEM AND METHOD FOR DETERMINING NETWORK ELEMENT CRITICALITY - A method includes obtaining routing tables, and link quality to neighbor nodes for each node in a wireless multi-hop network, iteratively removing a network element and determining alternative routes for each such removed network element, and identifying critical network elements where inadequate alternative routes exist after network elements are removed. The method may be implemented by code stored on a computer readable storage device for execution by a computer in some embodiments. | 06-27-2013 |
| 20130194911 | REDUNDANT NETWORK CONNECTIONS - Various exemplary embodiments relate to a method and related network node including one or more of the following: performing an active gateway election to determine whether the provider edge device will be an active gateway for a connection; if the provider edge device will be the active gateway for the connection, indicating to a customer edge device that no fault is currently associated with a link between the customer edge device and the provider edge device; and if the provider edge device will not be the active gateway for the connection, indicating to the customer edge device that a fault is currently associated with the link between the customer edge device and the provider edge device. | 08-01-2013 |
| 20130201817 | FAULT DETECTION AND MITIGATION FOR IN-VEHICLE LAN NETWORK MANAGEMENT - A method of detecting and mitigating an unintended active state of an in-vehicle communication network. The in-vehicle communication network includes a plurality of electronic control units (ECUs) communicating over a controller area network bus system. Each ECU includes both transmitting and receiving capabilities, and is configured with a communication protocol that provides guidelines for exchanging messages with other ECUs within the communication system. Each ECU enters a communication kernel active state for communicating on the bus. Virtual networks within the communication system are identified. Each virtual network includes a collection of signals involving respective ECUs whose transmission and reception are started and stopped collectively as a unit. Each respective virtual network that is active by fault is detected. Each faulty active virtual network is deactivated. | 08-08-2013 |
| 20130208581 | WIRELESS GATEWAY APPARATUS - A redundant communication system may include: a plurality of multiple communication apparatuses configured to function as a gateway, the same network address being allocated to all of the plurality of multiple communication apparatuses on a network; a setting unit configured to set one of the plurality of multiple communication apparatuses to be an active system as a first communication apparatus, the setting unit being configured to set the other of the plurality of multiple communication apparatuses to be a standby system as a second communication apparatus; and a switch configured to open to the network only the first communication apparatus. | 08-15-2013 |
| 20130250751 | ACCELERATED RECOVERY DURING NEGOTIATION BETWEEN A MEDIA GATEWAY AND A MEDIA GATEWAY CONTROLLER - A method is disclosed that enables an improved technique for recovering from an error scenario encountered during a call setup involving a malfunctioning media gateway and corresponding media gateway controller. The media gateway first detects a malfunction that affects a digital signal processing resource, and then proactively selects a processing resource available elsewhere at the gateway. The media gateway selects the new processing resource based on criteria including: i) the capabilities that were identified to handle the packet stream at the affected (faulty) processor; ii) the capabilities of the IP terminal originating the packet stream that is being moved; and iii) the Internet Protocol address of the affected processing resource. Advantageously, an effort is made to avoid having to inform the media gateway controller of the move, thereby minimizing any discontinuity in each packet stream and minimizing the time and processing that are required to establish the call. | 09-26-2013 |
| 20130265867 | EXPANDER-TARGETED ZONED BROADCAST - A method includes detecting a topology change on a link in a network and determining which zone group corresponds to the topology change. The method also includes identifying a zone group in the network that is permitted to access a device on said link and determining an address of an expander that has the zone group permitted to access the device on the link. The method further includes generating an expander-targeted zoned broadcast command to report a topology change in the network. The expander-targeted zoned broadcast command has, as a destination address, the address of the expander determined to have a zone group permitted to access a device on the link. | 10-10-2013 |
| 20130272112 | NETWORK SWITCH - A network switch is provided which can shorten a time required for switching-over to a backup route when a failure has occurred in a port for which an LAG is set. The network switch includes a failure detection unit for detecting a port failure, and a forced transfer processing unit for, when a failure is detected in a port at a transfer destination as a target in trying to transfer a received unicast frame and when an link aggregation group is set for a plurality of ports including the relevant port at the transfer destination, forcibly transferring the received unicast frame to another port for which the same link aggregation group as that set for the relevant port at the transfer destination is set. | 10-17-2013 |
| 20130308438 | HIGHLY SCALABLE MODULAR SYSTEM WITH HIGH RELIABILITY AND LOW LATENCY - A computing system for processing network traffic includes a plurality of network ports configured to receive network traffic, a plurality of processing blades, not directly coupled with the plurality of network ports, configured to process the network traffic, a switch coupled with the plurality of processing blades and configured to support inter-blade communications among the plurality of processing blades, a router coupled with the switch and the plurality of network ports, the router configured to forward the network traffic to one or more of the plurality of processing blades based on resource information of the plurality of the processing blades, and a system controller coupled to the router and the plurality of processing blades, the system controller configured to receive and maintain the resource information from the plurality of the processing blades and further configured to update the router with the resource information of the plurality of the processing blades. | 11-21-2013 |
| 20130308439 | HIGHLY SCALABLE MODULAR SYSTEM WITH HIGH RELIABILITY AND LOW LATENCY - A computing system for processing network traffic includes a plurality of network ports configured to receive network traffic, a plurality of processing blades, not directly coupled with the plurality of network ports, configured to process the network traffic, a switch coupled with the plurality of processing blades and configured to support inter-blade communications among the plurality of processing blades, a router coupled with the switch and the plurality of network ports, the router configured to forward the network traffic to one or more of the plurality of processing blades based on resource information of the plurality of the processing blades, and a system controller coupled to the router and the plurality of processing blades, the system controller configured to receive and maintain the resource information from the plurality of the processing blades and further configured to update the router with the resource information of the plurality of the processing blades. | 11-21-2013 |
| 20130322231 | ENHANCEMENTS TO PIM FAST RE-ROUTE WITH DOWNSTREAM NOTIFICATION PACKETS - A failure detection mechanism provides enhancements to PIM-SM based fast re-route techniques. A network node upon detecting a loss of connection determines whether it can re-route multicast data traffic. If the network node does not have a failure-free secondary path, it can originate a notification packet and send it to the downstream parts of a multicast tree. The notification packet can trigger one or more downstream nodes to switch-over to redundant secondary paths to re-route the multicast data traffic. | 12-05-2013 |
| 20130322232 | Enhancements to PIM Fast Re-Route with Upstream Activation Packets - An upstream activation mechanism provides enhancements to PIM-SM based fast re-route in a multicast communication network, where secondary paths provides redundancy to a multicast tree and are on standby to reduce bandwidth usage when there is no failure in the network. Upon receiving an indication of a loss of connection to the primary path of the multicast tree network, a network node that has a failure-free secondary path to a common source node of the multicast tree sends an activation packet upstream toward the common source node via the failure-free secondary path. The activation packet causes one or more upstream nodes to unblock their respective outgoing interfaces to thereby activate transmission of the multicast data traffic on the failure-free secondary path. | 12-05-2013 |
| 20140016454 | HIGH AVAILABILITY TRANSPORT PROTOCOL METHOD AND APPARATUS - A system and method supporting efficient, scalable stateful switchover of transport layer connections in a telecommunications network element. One method involves receiving, at a network element comprising an active transport protocol process coupled to a standby protocol process, a request to configure a first transport layer connection maintained at the active transport protocol process for stateful switchover; receiving an event associated with the first transport layer connection; creating a message containing replicated event information based on the received event; sending the message to the standby transport protocol process; and processing the message at the standby transport protocol process, wherein the standby transport protocol process replicates state information for the first connection. | 01-16-2014 |
| 20140029409 | METHODS AND SYSTEMS FOR AUTOMATICALLY TRACKING THE REROUTING OF LOGICAL CIRCUIT DATA IN A DATA NETWORK - An example method involves generating a table to store current reroute statistics based on rerouting of data from one or more logical circuits, when they have failed, to one or more logical failover circuits. The current reroute statistics include trap data received for the one or more logical circuits. The trap data includes a committed information rate. Each of the logical circuits and logical failover circuits is identified by a logical circuit identifier that is renamed until the one or more logical circuits have been restored. The table is updated to store updated reroute statistics that include updated trap data received for the one or more logical circuits. Generating the updated reroute statistics comprises detecting a change in a status of the one or more logical circuits by determining if a frame has been dropped. The frame is dropped when the committed information rate has been exceeded. | 01-30-2014 |
| 20140043959 | Reverse Notification Tree For Data Networks - Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches provide upstream messages indicating to an upstream switching system that the downstream traffic arrived intact and was properly handled. Upon this loss or failure of the upstream status message to an upstream switching system, an upstream switching system can reroute data traffic around a failed link or failed switch with a minimal amount of lost data. The upstream status message is conveyed from a downstream switching system to an upstream switching system via a reverse notification tree data pathway. | 02-13-2014 |
| 20140064057 | METHOD FOR MANAGING SERVICES IN A GENERALIZED-MULTI-PROTOCOL LABEL SWITCHING, GMPLS, CONTROLLED NETWORK - A Generalized-Multi-Protocol Label Switching controlled network is described, as is a method for managing services in the network under conditions of disrupted control plane connectivity. Nodes of the network use a Resource Reservation Protocol with Traffic Engineering extension, RSVP-TE, to allocate and provision resources of the network. Each of the nodes is adapted to evaluate local RSVP Path or Resv state data after having sent at least one signaling message to a receiving neighboring node without receipt of an acknowledgement message from said receiving node within a configurable time to determine an IP address of a node being located after the non-responsive receiving node along a service path of a service in a downstream or upstream direction. Each node is adapted to send the signaling message to the determined IP address of the next node located behind the non-responsive receiving node along the service path. | 03-06-2014 |
| 20140092722 | SYSTEM AND METHOD PROVIDING STANDBY BYPASS FOR DOUBLE FAILURE PROTECTION IN MPLS NETWORK - A method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path is disclosed. The method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path includes establishing a Bypass LSP having an end-to-end path; obtaining the nodes traversed by the end-to-end path; generating a request to a path calculator which using the nodes provided on the end-to-end path calculates a path disjoint to those nodes; and signaling the calculated disjoint path as a Backup LSP for the Bypass LSP. The method for providing a Backup Label Switched Path for a specified Bypass Label Switch Path provides protection advantages over systems known in the art by providing capability for handling double failure scenarios. | 04-03-2014 |
| 20140119171 | Resource Pooling in a Blade Cluster Switching Center Server - The present invention relates to a switching center server comprising:
| 05-01-2014 |
| 20140140199 | VIRTUAL LINK AGGREGATIONS ACROSS MULTIPLE FABRIC SWITCHES - One embodiment of the present invention provides a switch. The switch is configurable to be a member of a first fabric switch. The switch includes a link aggregation module. During operation, the link aggregation module marks an ingress-switch field of a frame with a virtual switch identifier. This virtual switch identifier is associated with the switch and a second switch, which is a member of a second fabric switch, and is from a range of identifier associated with the first fabric switch and the second fabric switch. Each of the first fabric switch and the second fabric switch is operable to accommodate a plurality of switches and operate as a single switch. | 05-22-2014 |
| 20140177431 | GRACEFUL FAILOVER OF A PRINCIPAL LINK IN A FIBER-CHANNEL FABRIC - In one embodiment, detecting a failure mode of a first communication link on a first port, selecting a second communication link on a second port associated with the first port, and transmitting a profile information associated with the second port are provided. | 06-26-2014 |
| 20140204727 | REDUNDANT CONTROL OF SELF-CONFIGURING WIRELESS NETWORK - Methods, systems, and apparatus, are provided for wireless networking. In some implementations, a self-configuring wireless system includes one or more wireless network devices; a primary access point device; and a secondary access point device; wherein the primary access point device and the at least one wireless network device are preconfigured with a respective key so as to enable the primary access point device to establish a secure wireless network with the at least one network device using the respective keys, and wherein the secondary access point device is configured assume coordination for the self-configuring wireless system if a fault associated with the primary access point device occurs. | 07-24-2014 |
| 20140211606 | Determining Root Sequence - It is presented a method, executed in a root sequence determiner for a base station controlling a first cell, the first cell being associated with at least one root sequence used for cell differentiation on a random access channel. The method comprises the steps of: obtaining information on root sequences of neighbouring cells; when a root sequence conflict is found between the first cell and a neighbouring cell, here denoted a conflict cell, determining if the conflict cell is of a higher priority than the first cell, the priorities of the first cell and the conflict cell being based on properties of the respective cells; and when the conflict cell is of a higher priority than the first cell, finding a new root sequence for the first cell, avoiding the root sequences of the neighbouring cells. | 07-31-2014 |
| 20140219077 | TRAFFIC MANAGEMENT ACROSS DATA CENTER SITES - According to an example, a traffic management method includes that an edge device of a data center site receives first-hop gateway information of at least one remote data center sites from an edge device of the at least one remote data center site, checks whether a local first-hop gateway has failed, and in response to the local first-hop gateway being determined as having failed, transmits a packet originating within the data center site and addressed to the local first hop gateway to an edge device of a remote data center site. | 08-07-2014 |
| 20140241146 | SYSTEM AND METHOD FOR TRAFFIC POLARIZATION DURING FAILURES - A system and method for traffic polarization during failures includes a communication network cluster including a first network switching unit configured to communicate with a first network node via a first network link and a second network node via a second network link, a second network switching unit configured to communicate with the first network node via a third network link and the second network node via a fourth network link, and a first intra-cluster link coupling the first network switching unit to the second network switching unit. The second network switching unit is further configured to respond to a failure in the fourth network link by broadcasting a route withdrawal message to the first network switching unit and the first network node. The first network switching unit is configured to accept rerouted network traffic from the first network node via the first network link resulting from the route withdrawal message. | 08-28-2014 |
| 20140269253 | METHOD AND DEVICE FOR ENTERING A NETWORK FOLLOWING AN ABNORMAL POWER DOWN IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and device for maintaining the context of user equipment (UE) in a wireless communication system. If power for a terminal is abnormally down, a base station receives an abnormal power down report and a request for maintaining the context of the terminal from the terminal, determines whether to maintain the context of the terminal, and transmits, to the terminal, an abnormal power down confirmation that indicates whether to maintain the context of the terminal. | 09-18-2014 |
| 20140355412 | COMPUTER IMPLEMENTED METHOD FOR TRACKING AND CHECKING MEASURES AND COMPUTER PROGRAMS THEREOF - A computer implemented method for tracking and checking measures and computer programs thereof. A master node receiving from a plurality of slaves nodes messages related with measures generated by the slaves nodes, the method including: capturing, a traffic driver unit, the messages sent by the slaves nodes and further sending them to a monitor unit; analyzing, the monitor unit, the received messages so as to detect, by a behavioral learning technique, anomalies in the messages; when an anomaly is detected, sending, the monitor unit, the detected anomaly to a regenerator unit for regenerating at least the detected anomaly by a prediction technique; and injecting, said traffic drive unit, measures regenerated by the regenerator unit to the transport network. | 12-04-2014 |
| 20140355413 | Peer, Application and Method for Detecting Faulty Peer in Peer-To-Peer Network - An application, peer and method for determining a faulty peer in a structured Peer-to-Peer overlay network. The overlay network includes plural peers besides the faulty peer. The method includes determining that a message sent from a given peer to a target peer along a first path did not reach the target peer; determining an intermediate peer at which the message had arrived; using a second path to send the message from the given peer to the target peer; determining that the message had arrived at the target peer on the second path; adjusting a node identifier (nodeID) of at least one of the target peer and the intermediate peer to obtain a new target peer or a new intermediate peer; and reusing the first and second paths to send the message to the new target peer or the new intermediate peer until the faulty peer is detected. | 12-04-2014 |
| 20140369179 | DATA RELAY DEVICE, DATA TRANSMISSION DEVICE, AND NETWORK SYSTEM - With respect to a routing and a gateway (protocol conversion) in a network system, frame data can simply be generated even if a source node does not understand format specifications of all protocols, communication efficiency degradation caused by an enlargement of header information can be prevented as much as possible, and dealing with a new protocol can be simplified. A source node (data transmission device) transmits “common routing information”, which includes route information identifying all the nodes through which a message frame is routed from an own node to a destination node, while adding the common routing information on the message frame. Each relay node (data relay device) sequentially transfers the message frame while referring to the common routing information to perform identification of a destination, generation of a header, and update of the common routing information. | 12-18-2014 |
| 20140369180 | POWER SUPPLY CONTROLLER, RELAY NODE DEVICE, WIRED AD-HOC NETWORK SYSTEM, AND POWER SUPPLY CONTROL METHOD - A power supply controller includes a first port, a second port, and a controller. The first port is connected to a power supply device. The second port is connected to a first relay node device via a wired path. The controller performs control to supply power received from the power supply device from the second port to the first relay node device. The controller performs control to generate a power-on instruction frame for instructing the first relay node device started by receiving power supply to start power supply from a port included in the first relay node device to a second relay node device connected to the first relay node device via a wired path. The controller performs control to transmit the generated power-on instruction frame from the second port. | 12-18-2014 |
| 20140376359 | DATA COMMUNICATION APPARATUS, DATA COMMUNICATION SYSTEM, AND DATA COMMUNICATION METHOD - A data communication apparatus forms a mesh network together with at least one gateway includes a frame generating unit and a frame transferring unit. The frame generating unit generates a meter data frame to transmit to a gateway. The meter data frame is a frame including meter data. The frame transferring unit transfers the meter data frame received from another data communication apparatus. The meter data frame is addressed to the gateway. The frame generating unit transmits the meter data frame to which number of alternate routing that indicates number of allowable transmission attempts from a data communication apparatus adjacent to a destination gateway of the meter data frame to the gateway is added. The frame transferring unit changes the number of alternate routing added thereto to a value smaller by 1 than a value that has been set and transits the meter data frame to another data communication apparatus. | 12-25-2014 |
| 20150023149 | COMMUNICATION SYSTEM AND TRANSFER APPARATUS - A communication system includes a work path and a protection path that are set between a first transfer apparatus and a second transfer apparatus, one of the work path and the protection path being selected by the first transfer apparatus and the second transfer apparatus according to a control signal that includes first information indicating whether there is a failure in one of the work path and the protection path, and a third path that is activated when the first transfer apparatus or the second transfer apparatus receives a control signal in which the first information has been changed to second information indicating that a failure had occurred in both the work path and the protection path and is selected by the first transfer apparatus and the second transfer apparatus. | 01-22-2015 |
| 20150023150 | Establishing and Protecting Label Switched Paths Across Topology-Transparent Zones - A label switched path (LSP) establishing method comprising receiving a first path message from a network node outside of a topology-transparent zone (TTZ) along a path for the LSP, computing a TTZ path through the TTZ from the network component to an egress TTZ edge node along the LSP, sending a second path message to a TTZ internal node along the TTZ path, receiving a first reservation (RESV) message from the TTZ internal node that comprises a label allocated for the egress TTZ edge node, and sending a second RESV message that comprises a label allocated for the network component and the label allocated for the egress TTZ edge node to the network node. | 01-22-2015 |
| 20150063093 | TECHNIQUE FOR DETERMINING WHETHER TO REESTABLISH FAST REROUTED PRIMARY TUNNELS BASED ON BACKUP TUNNEL PATH QUALITY FEEDBACK - In one embodiment, a primary tunnel is established from a head-end node to a destination along a path including one or more protected network elements for which a fast reroute path is available to pass traffic around the one or more network elements in the event of their failure. A first path quality measures path quality prior to failure of the one or more protected network elements. A second path quality measures path quality subsequent to failure of the one or more protected network elements, while the fast reroute path is being used to pass traffic of the primary tunnel. A determination is made whether to reestablish the primary tunnel over a new path that does not include the one or more failed protected network elements, or to continue to utilize the path with the fast reroute path, in response to a difference between the first path quality and the second path quality. | 03-05-2015 |
| 20150071055 | ENHANCEMENTS TO PIM FAST RE-ROUTE WITH UPSTREAM ACTIVATION PACKETS - A method performed by a network node. The method includes detecting a loss of connection at an incoming interface to an upstream neighbor of the network node, where the network node is in a multicast communication network that includes a multicast tree to provide connectivity from a common source node to one or more multicast recipient nodes. The multicast communication network further includes a set of one or more secondary paths to provide redundancy to the multicast tree, and sending a notification packet downstream toward the one or more multicast recipient nodes when the network node cannot re-route the multicast data traffic to allow the multicast data traffic to be received by the multicast recipient nodes, wherein the notification packet causes one or more downstream nodes to switch multicast reception to one or more of the set of one or more secondary paths to re-route the multicast data traffic. | 03-12-2015 |
| 20150085637 | ETHERNET RING PROTECTION NODE - Systems and methods are disclosed for providing redundancy in a network node implementing a ring protection protocol. Each of the two ring ports connecting the node to other nodes in a ring supporting the protocol may be maintained by a separate line card. Should one line card fail, traffic passing through the node may be redirected through the remaining ring port under the control of the surviving state machine. The two state machines may be coordinated over the backplane of the node to maintain a common state, making them transparent to other nodes. Additionally, the backplane link between the state machines may be monitored for failures that may be addressed with messages used to respond to general ring failures and by assigning one state machine to block a ring port upon recovery to prevent a loop within the ring until the ring protection link can be blocked. | 03-26-2015 |
| 20150085638 | MULTIPROTOCOL LABEL SWITCHING TRAFFIC ENGINEERING TUNNEL ESTABLISHING METHOD AND DEVICE - Embodiments of the present invention provide a Multiprotocol Label Switching traffic engineering tunnel establishing method and device. A tunnel establishing method includes: receiving, by a second routing device, an identifier, which is sent by a first routing device, of an MPLS TE tunnel from a first VPN instance to a second VPN instance; acquiring, by the second routing device according to the identifier, path information of the MPLS TE tunnel from the first VPN instance to the second VPN instance; and establishing an MPLS TE tunnel from the second VPN instance to the first VPN instance according to the acquired path information. Therefore, forward and reverse bidirectional tunnels are co-routed or partially co-routed, thereby solving a problem caused by non-co-routing during BFD. | 03-26-2015 |
| 20150103641 | LOAD SHARING METHOD AND APPARATUS, AND BOARD - Embodiments of the present invention provide a load sharing method and apparatus, and a board. The method includes: receiving, by a built-in forwarding unit, to-be-transmitted data; obtaining, by a management control unit, current load ratios of forwarding units; and if it is determined that a current load ratio of any forwarding unit of the forwarding units is less than a preset load ratio threshold, determining that the forwarding unit is a unit for forwarding the to-be-transmitted data, where the built-in forwarding unit and the management control unit are located in a same board, and the forwarding units include the built-in forwarding unit and another forwarding unit outside the board. The present invention can solve a problem of low data transmission reliability in an existing load sharing method. | 04-16-2015 |
| 20150124583 | NETWORK COMMUNICATION METHODS AND APPARATUS - The present invention includes various novel systems and methods for communication in a network. A System Environment Monitor is employed in some embodiments to extract from the network both real-time and historical Network Metrics at the Infrastructure Layer, as well as Application Metadata at the Application Layer. Network analytics facilitate decisions based upon the differing characteristics of Application Components and lower-level hardware components across multiple DTTs. In response, an SDN Controller generates modified sets of SDN Flows, and implements them in real time across a mixed technology (multi-DTT) network in a manner that avoids disrupting existing SDN Flows and other real-time network traffic. | 05-07-2015 |
| 20150131430 | METHOD AND APPARATUS FOR MANAGING IDENTIFIERS OF A MULTIPLE WANS NETWORK DEVICE - The method and apparatus of the present invention concern the enablement and disablement of at least one identifier of a network device, which is capable of allowing connecting to a plurality of wide area network (WAN) connections through at least one wireless local area (WLAN) network connection. When a first WAN network connection does not meet at least one condition, the at least one corresponding identifier of said first WAN network connection are disabled and other identifiers not corresponding to said first WAN network connection are not affected. When first WAN network connection meets all said conditions again, said at least one corresponding identifier of said first WAN network connection are enabled again. | 05-14-2015 |
| 20150312089 | METHOD OF MANAGING ZIGBEE NETWORK IN THE INTERNET OF THINGS - The present invention provides a method of reporting network information of the ZigBee network in a ZigBee coordination node of an Internet of Things, wherein the ZigBee coordination node is connected to a plurality of ZigBee nodes forming the ZigBee network, and the Internet of Things further comprises an auto-configuration server in the IP network, the ZigBee coordination node being connected to the auto-configuration server through a gateway, the method comprising the following steps: sending a first signaling based on the ZigBee device object to the gateway, the first signaling including network description information and neighbor list information of each ZigBee node in the ZigBee network. According to the solution of the present invention, it makes it possible to use TR-069 to manage the ZigBee network, and in the case of ZigBee network failure, the manager of the ZigBee network can rapidly understand the failure cause so as to be capable of rapidly locating and eliminating the failure, thereby enhancing the network management efficiency. | 10-29-2015 |
| 20150312090 | Relay System and Switching Device - When a first port group is set to active and a minimum link determining unit determines that a link fault is absent, a port control unit controls a first port, in which no fault occurrence is detected, in the first port group to a first state. When the first port group is set to standby and a fault notification frame is not received via a bridge port, the port control unit controls the plurality of first ports constituting the first port group to a second state. An OAM transmitting unit transmits a CCM frame from each of the first ports controlled to the first state and transmits a RDI frame from each of the first ports controlled to the second state. | 10-29-2015 |
| 20150334767 | Device of Handling Measurement Configuration - A communication device for handling a measurement configuration comprises a storage unit and a processing means coupled to the storage unit. The processing means is configured to execute instructions stored in the storage unit. The instructions comprise communicating with a master base station and a secondary base station; detecting a link failure related to the secondary base station while communicating with the master base station; keeping a first measurement configuration for measuring a first carrier of the master base station and removing a second measurement configuration for measuring a second carrier of the secondary base station in response to the detection of the link failure; and transmitting a message for indicating the link failure to the master base station. | 11-19-2015 |
| 20150365854 | ADDRESSING COMMUNICATION FAILURE IN MULTIPLE CONNECTION SYSTEMS - Systems and techniques for link failure management in multiple connection systems. Upon detection of a link failure with a local area base station during a dual connection mode in which the user device is connected to a macro base station and a local area base station, a user device sends a failure indication and a measurement results report for serving and neighboring base stations to its serving macro base station, and selects a response to the failure based at least in part on evaluation information received from the macro base station. Upon detection of a link failure with a macro base station, the user device determines whether to reconnect to the macro base station or a different macro base station and whether to reconnect with the original local area base station or a different local area base station. | 12-17-2015 |
| 20150372856 | POINT-TO-MULTIPOINT RING NETWORK PROTECTION METHOD AND DEVICE - The present disclosure provides a p2mp ring network protection method and device. With respect to each ring in the p2mp ring network, determining p2mp services with an identical off-ring node as a protection group; and establishing a pair of closed loop channels in opposite directions for each protection group; for each p2mp service, taking one of the closed loop channels as a working channel, and taking the other one of the closed loop channels as a protection channel. According to the present disclosure, the network structure can be simplified and the network resources can be saved. | 12-24-2015 |
| 20150381498 | NETWORK SYSTEM AND ITS LOAD DISTRIBUTION METHOD - A network system includes a plurality of first computers, which transmit and receive data via a network and are equipped with a plurality of active and standby communication paths. A second computer is connected with the first computers via the network. Each first computer acquires path information concerning active and standby communication paths in the network and traffic of the active communication path and transmits them to the second computer. The second computer: predicts a load on each network node when the communication path is to be switched to each standby communication path; selects a first computer, whose communication path should be switched, and a standby communication path, which is a switching target, based on the prediction result; and requests the first computer to switch the communication path to the standby communication path. | 12-31-2015 |
| 20160013970 | METHODS AND SYSTEMS FOR AUTOMATICALLY TRACKING THE REROUTING OF LOGICAL CIRCUIT DATA IN A DATA NETWORK | 01-14-2016 |
| 20160013981 | NETWORK SYSTEM, NODE, NETWORK MANAGEMENT METHOD, AND COMPUTER-READABLE RECORDING MEDIUM | 01-14-2016 |
| 20160020939 | SYSTEMS AND METHODS FOR HANDLING LINK AGGREGATION FAILOVER WITH A CONTROLLER - A network of switches having ports coupled to other switches or end hosts may be controlled by a controller. The controller may identify whether any switch ports have failed. In response to identifying that a port has failed at a first switch, the controller may modify link aggregation group mappings of the other switches to handle failover. The controller may modify the link aggregation group mapping of each other switch to include a first mapping that includes ports coupled to the first switch and a second mapping that does not include any ports coupled to the first switch. The controller may configure forwarding tables at the switches to forward network packets using the first or second mappings based on network topology information maintained by the controller. | 01-21-2016 |
| 20160036946 | HITLESS PRUNING PROTOCOL UPGRADE ON SINGLE SUPERVISOR NETWORK DEVICES - Upon receiving a first message, from the second network device, indicating that the second network device is incompatible with one or more virtual local area network (VLAN) pruning techniques, a timer on a first network device is configured to expire after a predetermined period of time. The first network device is configured to maintain a subscription for the second network device to one or more VLANs until the timer expires. The second network device is configured to transmit the first message in response to detecting an upcoming control plane outage at the second device. Prior to the timer expiring, embodiments transmit data assigned to the one or more VLANs to the second network device. Embodiments also periodically receive update messages, from the second network device, identifying one or more VLANs to which the second network device wants to subscribe. | 02-04-2016 |
| 20160043936 | METHOD AND APPARATUS FOR PROVIDING RESILIENCY IN MULTICAST NETWORKS - Techniques for minimizing packet loss of multicast traffic stream when a failure occurs are described herein. In one embodiment of the invention, a network element separately joins a multicast group through a first and second path respectively. During uninterrupted operation, the network element processes the packets of the multicast traffic stream it receives through the first path and drops the packets of the equivalent multicast traffic stream it receives through the second path. Upon an interruption of the packets of the multicast traffic stream being received through the first path, the network element transitions to processing the packets of the equivalent multicast traffic stream it receives through the second path. Other methods and apparatuses are also described. | 02-11-2016 |
| 20160072663 | Robust Routing of Data in Wireless Networks - A wireless network ( | 03-10-2016 |
| 20160072700 | COMMUNICATION SYSTEM, CONTROL DEVICE, NODE, PROCESSING RULE SETTING METHOD AND PROGRAM - A communication system includes a plurality of nodes each including a packet processor that processes a packet in accordance with a packet handling operation(s) when the packet is received, the packet handling operation(s) correlating a processing to be applied to the packet with a matching rule that identifies the packet to which the processing is to be applied, and a control device that calculates a packet forwarding path in response to a request to set the packet handling operation from any one of the nodes; the control device setting a plurality of the packet handling operations that implement the packet forwarding path for the node(s) on the packet forwarding path and recording the packet handling operations in correlation with one another, the control device inquiring at the node(s) on the packet forwarding path about a setting state(s) of the packet handling operation(s). | 03-10-2016 |
| 20160119822 | INTELLIGENT MODE SELECTION FOR CIRCUIT SWITCHED FALL BACK DEVICES - Methods, systems, and devices are described for wireless communication, including for intelligent mode selection for circuit switched fall back devices. A user equipment (UE) attached to a wireless network may determine that circuit switched fall back (CSFB) service is not available. The UE may thus elect to operate in a packet switched (PS) operating mode until CSFB service again becomes available. For example, the UE may receive a system information block (SIB) indicating that the CSFB connection is not available, the UE may attempt to access a CSFB a predetermined number of times, or the UE may miss a number of voice calls. The UE may, based on this determination, select a packet switched (PS) operating mode. The UE may continue to exchange PS data with the serving cell based on the PS operating mode. The UE may then periodically evaluate the signal quality for a 1x cell. | 04-28-2016 |
| 20160149658 | Method and device for detecting fault in synchronization link - Disclosed are a method and a device for detecting a fault in a synchronization link. The method includes: setting one or more reference nodes corresponding to a node to be detected ( | 05-26-2016 |
| 20160156504 | CONTROLLING FORWARDING DEVICES IN SOFTWARE DEFINED NETWORKS | 06-02-2016 |
| 20160165461 | OPTIMISATION OF A CELLULAR RADIO NETWORK - Self-optimisation for a base station within a cellular radio network is provided. The base station has a first communication interface for providing a service to mobile terminals and a second communication interface for communication with other network entities of the cellular radio network. A degradation in performance of the service provided over the first communication interface is detected. A reliability level for the second communication interface is identified and a Self-Organising Network (SON) algorithm is implemented in dependence on the identified reliability level and in response to the detection of degradation. | 06-09-2016 |
| 20160165464 | METHOD AND DEVICE FOR HANDLING CELL OUTAGE - Embodiments of the present invention provide a method and device for handling a cell outage. The method for handling a cell outage includes: receiving, by a first base station, an energy saving activation message sent by a second base station when a cell outage happens to a second cell, where the energy saving activation message is used to disable the energy saving function; transferring, by the first base station, the first cell from the energy saving state to the normal state according to the energy saving activation message, or keeping a third cell in the normal state until learning that the cell outage of the second cell is solved. This method prevents a coverage blind area in the network when a cell outage happens to a second cell that covers the area of a first cell which is in the energy saving state. | 06-09-2016 |
| 20160182362 | INTER-DOMAIN FAST REROUTE METHODS AND NETWORK DEVICES | 06-23-2016 |
| 20160191301 | COMMUNICATION NETWORK SERVICE CONDITION DETECTION - A telecommunications system includes a network device that detects a communication failure associated with a first communication network and generates a failure command for a remote device to transmit a failure signal over a second communication network. The failure signal represents the communication failure. A method includes detecting a communication failure associated with a first communication network, generating a failure command for a remote device to transmit a failure signal over a second communication network, and transmitting the failure command to the remote device. The network device may take a corrective action in response to receiving a recovery signal from the remote device. | 06-30-2016 |
| 20160191303 | SNAPSHOT MESSAGE - A blockage is detected at a first link based on a delay and/or stoppage of transmission of a data message along the first link between first and second nodes of a plurality of nodes of a fabric. A snapshot message is sent along at least a second link between the first and second nodes in response to the blockage being detected. The second node may capture a fabric state at the second node in response to receiving the snapshot message, before a corrective action occurs. | 06-30-2016 |
| 20160191375 | ENHANCED UPLINK CHANNEL CONTROL FOR USER EQUIPMENT BASED ON THE CHANNEL CONDITION OF ENHANCED UPLINK CAPABLE CELL(S) - Aspects of controlling uplink transmissions on an enhanced dedicated channel in wireless communications include a user equipment configured to determine an unfavorable condition of an enhanced dedicated channel established with an enhanced network entity in response to failing to receive a threshold number of responses corresponding to uplink data transmissions on the enhanced dedicated channel, during an established connection with at least one non-enhanced network entity. Further, the aspects may include the UE suspending building of protocol data units for enhanced dedicated channel transmissions in response to determining the unfavorable condition of the enhanced dedicated channel. Additionally, the aspects may include the UE suspending uplink transmission on the enhanced dedicated channel in response to determining the unfavorable condition of the enhanced dedicated channel. | 06-30-2016 |
| 20160255557 | VOICE/DATA HYBRID MODE | 09-01-2016 |
