Entries |
Document | Title | Date |
20080205263 | System and method for advanced fail-over for packet label swapping - The present method for advanced fail-over packet label swapping for a packet network having a working path and a protection path, each of the working path and protection path interconnected by a near-end switch and a far-end switch includes: provisioning the working path, protection path, near-end switch, and far-end switch with a failure counter delay; monitoring heartbeat packets on one of the near-end switch and the far-end switch during a monitoring period to determine a number of packets that were not received by at least one of the switches during the monitoring period; determining if the determined number of packets exceeds a predetermined lost packet value for the failure counter delay; and responsive to the determined number of packets exceeding the predetermined lost packet value, delaying the monitoring for a period of time equal to the failure counter delay. | 08-28-2008 |
20080219150 | AUTO-NEGOTIATION BY NODES ON AN INFINIBAND FABRIC - A method and system for digital communication wherein nodes exchange messages at a first data rate in order to coordinate testing at a second, higher data rate. After testing is completed, the nodes exchange test results at the first data rate, and if conditions are satisfactory for operation at the second data rate user data are transmitted at the second data rate. Otherwise, user data are transmitted at the first data rate. | 09-11-2008 |
20080225698 | 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. | 09-18-2008 |
20080225699 | Router and method of supporting nonstop packet forwarding on system redundant network - A router (i.e., an electrical circuit) and method of supporting nonstop packet forwarding on a system redundant network are provided. The method includes, when the router again operates, identifying whether or not the router is connected with a neighboring router; and when the router is identified connected with the neighboring router, transmitting a link-up signal to a link to connect to a host node. | 09-18-2008 |
20080225700 | Protocol Definition for Software Bridge Failover - A method, data processing system, and computer usable code are provided for protocol definition for software bridge failover. In a first aspect of the present invention, a first software bridge determines the proper working operation of a physical adapter. Limbo packets are sent to a second software bridge alerting the second software bridge that the first software bridge is no longer bridging traffic responsive to the physical adapter failure in the first software bridge. The second software bridge receives the limbo packets, and, in response to receiving the limbo packets, asserts primary control and initiates bridging of traffic. In an alternative aspect of the present invention a first software bridge sends keep-alive packets. A second software bridge monitors the keep-alive packets from the first software bridge and, in response to a failure to detect the keep-alive packets from the first software bridge, the second software bridge initiates bridging of traffic. | 09-18-2008 |
20080232244 | Proactive protection mechanism based on advanced failure warning - In one embodiment, an apparatus can include: (i) logic configured to detect an advanced warning indication, such as for a degraded signal condition, on a first link between first and second network devices, where the detection can utilize a number of corrected bits and forward error correction (FEC), for example; and (ii) logic configured to reroute packet traffic from the first link to a second link when the degraded signal condition is detected. | 09-25-2008 |
20080253281 | 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. | 10-16-2008 |
20080259786 | SYSTEM AND METHOD FOR SUPPORTING SDH/SONET APS ON ETHERNET - An Ethernet PHY hardware device supports Ethernet MAC SDH/SONET Automatic Protection Switching (APS) functionality for managing protection from failures and recovery from failures on an Ethernet network. An Ethernet PHY sublayer stored on the Ethernet PHY hardware device is configured to monitor working and protect channels and generate an interrupt upon detection of a hard failure or a soft failure. Upon detection of port failures or link failures, the Ethernet PHY sublayer generates the interrupt to invoke an Ethernet MAC Client APS Controller configured to generate and terminate APS requests on working and protect channels to manage protection of working and protect channels from failures and recovery from failures on the Ethernet network. The Ethernet PHY hardware device is configurable for use with a plurality of different network topologies to manage protection from hard or soft failures and recovery from hard or soft failures on the Ethernet network using the Ethernet PHY sublayer. | 10-23-2008 |
20080273455 | Retry Strategies for Use in a Streaming Environment - Strategies are described for performing retry analysis in an environment which involves the transmission of media information from a source module to a target module. In the context of the source module, the retry analysis determines whether the source module should satisfy the retry requests issued by the target module. In the context of the target module, the retry analysis determines whether the target module should generate the retry requests in the first place. Novel request reporting formats are also described. The target module performs analysis to determine what reporting format it should use to convey the retry requests to the source module. | 11-06-2008 |
20080298229 | NETWORK WIDE TIME BASED CORRELATION OF INTERNET PROTOCOL (IP) SERVICE LEVEL AGREEMENT (SLA) FAULTS - In particular embodiments, receiving a first connectivity fault notification, establishing a predetermined time period when the first connectivity fault notification is received, receiving one or more additional connectivity fault notifications during the predetermined time period, performing a root cause analysis for the connectivity fault notification based on the received first connectivity fault notification, and resolving the first and the one or more additional connectivity fault notifications based on the root cause analysis are provided. | 12-04-2008 |
20090003194 | Resilience Solution for Top Tier Bandwidth Managers - The present invention relates to a back up top tier bandwidth manager ( | 01-01-2009 |
20090003195 | INTELLIGENT NETWORK RESTORATION - A device may isolate a first failure of a network interface that transports packets from one point in a network to another point in the network, may detect a subsequent failure of the interface, and may identify a recovery of the network interface from the subsequent failure. In addition, the device may restore the network interface to the network to enable the interface to transport packets after a wait-to-restore period that is approximately greater than or equal to a time difference between when the first failure and the subsequent failure occur. | 01-01-2009 |
20090010153 | Fast remote failure notification - A method and system for failure notification at a remote node in communication with a local node are disclosed. The local node is configured for faster failure detection than the remote node. In one embodiment, the method includes establishing a failure monitoring session between the local node and the remote node, receiving at the remote node, a failure notification from the local node, the failure notification sent using a protocol of the failure monitoring session, and rerouting traffic at the remote node in response to the failure notification. | 01-08-2009 |
20090028043 | Method for relieving failure, and packet communication device - When a failure occurs on a path set between two packet communication devices, a protection path is set and the communication is recovered without having the effect of the path failure on devices other than the two packet communication devices. When a packet communication device detects a failure in a transmission line or a path between the device itself and a correspondent packet communication device to restore the communication, at least one of a topology modification notice pending step, in which the fact that the connection with the correspondent packet communication device being disconnected is not reported to the packet communication devices other than the correspondent packet communication device for a prescribed time, and a path restoration step, in which path setting signaling is performed to trigger cooperation of the path communication device and the correspondent packet communication device to set the protection path within the prescribed time, is executed together with a virtual interface setting modification step in which a virtual interface used for the path disconnected by the failure is set to the protection path. | 01-29-2009 |
20090086621 | Correlating Label Switched Paths Of A Pseudowire - In one embodiment, correlating label switched paths of a pseudowire includes receiving a first message at a second label switching router. The first message is sent from a first label switching router and includes a pseudowire identifier and a first label switched path identifier. The pseudowire identifier identifies a pseudowire, and the first label switched path identifier identifies a first label switched path that implements the pseudowire. A second message is sent from the second label switching router to the first label switching router. The second message comprises the pseudowire identifier and a second label switched path identifier. The second label switched path identifier identifies a second label switched path that implements the pseudowire. | 04-02-2009 |
20090109839 | Apparatus for Realizing Soft-Switch Allopatric Disaster Recovery Based on Packet Network - The present invention provides a device for realizing disaster recovery of soft-switch based on packet network, comprising at least two core control devices located in different places which provide control service for their respective access equipments; wherein said core control devices further include a process unit, a database unit, a share unit and a synchronization process unit which are specifically used for remote disaster recovery; said process unit and database unit are independent of the processor and the database already existing within the core control devices, and are specifically used for providing service for remote access equipments, thereby making the core control devices in different places be of mutual disaster recovery relation; said share unit is used for sharing processing ability and data; and said synchronization process unit is used for synchronizing data between the core control devices of mutual disaster recovery. The core control devices capable of providing disaster recovery function of the present invention guarantee uninterrupted operation for system, and provide high accessability of the access equipments in the packet switch network. | 04-30-2009 |
20090109840 | Fault-resistant digital-content-stream AV packet switch - An AV packet switch comprises a multiplexer system having multiple multiplexer input terminals and multiple multiplexer output terminals, a particular multiplexer input terminal capable to receive an input stream synchronized with a first clock signal, a particular multiplexer output terminal capable to receive the input stream from the particular multiplexer input terminal; and an output stream destination synchronizer coupled to the particular switch output terminal capable to synchronize the input stream with a destination's clock signal. | 04-30-2009 |
20090109841 | Layer-2 Redundancy Protocol Interconnection Device - Interconnection devices and interconnect a network running a redundancy protocol and another network running a redundancy protocol. The interconnection devices controls the redundancy protocol of a lower level network via virtual ports and by a virtual link, to redundancy-connect the lower level network to a higher level network. When a communication route of the lower level network is changed, MAC address learning results of the higher level network are cleared to perform switching of communication routes at high speed. | 04-30-2009 |
20090154340 | FAST OSPF INACTIVE ROUTER DETECTION - A fast OSPF inactive router detection technique is provided that detects the failure of a router and switches routing to an alternate router. The alternate router provides a message to the other routers in the Wide Area Network (LAN) that informs of the router failure. | 06-18-2009 |
20090161533 | ACTIVE FAULT MANAGEMENT FOR METRO ETHERNET SERVICE OVER MPLS NETWORK - In one embodiment, a technique for detecting a break in a pseudowire and automatic shutting down user network interface (UNI) ports affected by the break is provided. In response to the loss of connectivity on the shut down ports, customer edge devices may automatically switch over to redundant circuits (e.g., other UNI ports not affected by the break in the pseudowire) and establish a different pseudowire. | 06-25-2009 |
20090168642 | TELEPHONE SYSTEM, AND NODE DEVICE AND REROUTING METHOD FOR THE SYSTEM - According to one embodiment of the invention, there is provided a telephone system comprises nodes connected to a first network of a packet exchange type and a second network of a volume-based charging type. The nodes mutually form a communication route. The system comprises terminal devices each connected to any one of the nodes and configured to mutually perform telephone communication via the route. Each of the nodes comprises a detector monitors a state of first network to detect failure in the first network, a reroute processor reroutes a part of the route into second network via a relay node to be an interface between the networks to avoid the detected failure, and a decision processor decides a relay node to minimize a cost required for the route to pass the second network. The reroute processor reroutes the route via the relay node decided by the decision processor. | 07-02-2009 |
20090185479 | Communication Systems - An uplink transmission method for use in a multi-hop communication system, the system comprising a mobile station (MS), a base station (BS) and one or more relay stations (RS), and the system providing two or more different communication paths extending between the mobile station and the base station, the mobile station being operable to transmit information indirectly to the base station along a series of links forming a first such communication path via one or more of the relay stations and also being operable to transmit information to the base station along one link or a series of links forming a second such communication path; the method comprising transmitting particular information from the mobile station along the first and the second communication paths; and combining the same particular information transmitted along the first and second communication paths in the base station. | 07-23-2009 |
20090185480 | Method and System for Re-enabling Disabled Ports in a Network with Two Port MAC Relays - A system and method for enabling a disabled port on a device such as a Two Port Medium Access Control (MAC) Relay (TPMR), which relays MAC frames in a communication network. When a link in the network fails, the TPMR disables the port due to operation of a link failure propagation protocol. When the TPMR detects that the failed link is repaired, the TPMR stops transmitting link failure Packet Data Units (PDUs) and transmits a Link Failure Terminating PDU to other connected TPMRs in the network. Receipt of the Link Failure Terminating PDU indicates the failed link is repaired and all ports disabled as a result of the failure should consequently be enabled. | 07-23-2009 |
20090185481 | METHOD AND NETWORK NODE FOR SELF-REGULATING, AUTONOMOUS AND DECENTRALIZED TRAFFIC DISTRIBUTION IN A MULTIPATH NETWORK - According to one embodiment, traffic load is redirected in reaction to traffic overload or a link failure in a packet-based network that is formed by nodes and links, packets being distributed along multiple paths to other links of an associated array of paths. The redistribution is performed autonomously by the node which is located immediately upstream of the affected link. According to a further development of the method, nodes that are located upstream of the concerned node are notified and are made to perform a redistribution that relieves the concerned node if the array of paths is not made overload-free by the redistribution performed by the node. A mechanism that protects against overload and failures and reacts in a significantly more flexible and less error-prone manner than networks having a central control body due to the nodes being autonomous is provided. | 07-23-2009 |
20090185482 | METHOD AND SYSTEM FOR PROTECTION SWITCHING DECISION - A method for protection switching decision includes: performing performance monitoring and failure detection on a first transmitting entity that transmits services; performing performance monitoring and failure detection on a second transmitting entity that does not transmit services; and making protection switching decision according to the performance monitoring and failure detection results of the first transmitting entity and second transmitting entity. A system for performance monitoring is also disclosed. In embodiments of the present invention, performance monitoring may be performed on the transmitting entity that does not transmit services, thus avoiding invalid switching of services and improving the quality of services. | 07-23-2009 |
20090196169 | METHODS AND APPARATUSES FOR PROCESSING AND MANAGING SUBSCRIBER DATA IN TELECOMMUNICATION NETWORK - In order to overcome the defects of the centralized subscriber data management in the telecommunication network, a highly effective distributed data management system for the communication network is achieved in the present invention through improving and applying the distributed Hash table (DHT) technology to subscriber data management in the communication network, which overcomes the deficiencies of the conventional centralized data management. A method for processing subscriber data in a communication network based on a DHT is provided, which includes the following steps. A first node in a DHT overlay network receives subscriber data to be stored. The subscriber data to be stored is regarded as backup data divided into L/K portions. L is greater than or equal to a ratio of a node working bandwidth of a second node to a node recovering bandwidth for data recovery of the second node in the DHT overlay network. K is a total number of backup data and is an integer greater than zero. The subscriber data to be stored is regarded as master data, and the master data and K×L/K divided backup data are, respectively, stored in 1+K×L/K DHT nodes. | 08-06-2009 |
20090219804 | ROUTING PROTOCOLS FOR ACCOMMODATING NODES WITH REDUNDANT ROUTING FACILITIES - Graceful restart in routers having redundant routing facilities may be accomplished by replicating network (state/topology) information. | 09-03-2009 |
20090268607 | METHOD AND DEVICE FOR MULTICAST TRAFFIC REDUNDANCY PROTECTION - A method and apparatus of multicast traffic redundancy protection is provided. After a fault occurs, the VRRP selects a new active router and notifies the PIM routing protocol, and the PIM uses the new active router as its DR. | 10-29-2009 |
20090279426 | SYSTEM AND METHOD FOR DEAD GATEWAY DETECTION - A system and method for detecting a next-hop dead gateway is disclosed. In one embodiment, a method for detecting the next-hop dead gateway includes sending an Internet Protocol (IP) packet by a host to a next-hop gateway associated with the host, receiving the IP packet by the host from the next-hop gateway upon reviewing a routing table and the destination field in the IP header associated with the IP packet, determining whether the IP packet is received from the next-hop gateway within a first predetermined time interval, if so, declaring the next-hop gateway as alive, and if not, declaring the next-hop gateway as dead. In some embodiments, source and destination fields in IP header associated with the IP packet include IP address associated with the host. The method may further include encapsulating the IP packet with a data link layer protocol associated with the host and the next-hop gateway. | 11-12-2009 |
20090285089 | Method and Apparatus for Validating Control and Data Plane Association - A method and apparatus for validating control and data plane association is described. In one embodiment of the invention, a first provider edge (PE) network element negotiates a pseudowire with a second PE network element. The pseudowire is uniquely identifiable between the first and second PE network element with a unique pseudowire identifier. The first PE network element receives OAM (operations, administration, and management) packets each including a pseudowire identifier from the second PE network element over the negotiated pseudowire. If an OAM packet is received with a pseudowire identifier that does not match the negotiated pseudowire, the first PE network element determines a data plane fault is associated with the pseudowire on the second PE network element. However, if the OAM packets include the pseudowire identifier that matches the negotiated pseudowire, the control and data plane association of the second PE network element is validated. Other methods and apparatuses are also described. | 11-19-2009 |
20090316570 | FUTILE NEIGHBOR STATE LOOP PREVENTION IN HIGH AVAILABILITY NETWORKS - A method for detecting and managing a futile neighbor state loop during link state routing is disclosed. The method can include reading a threshold parameter for link state routing, wherein the threshold parameter indicates a number of routing attempts, and performing link state routing to a node via a primary interface. The method can further include detecting a futile neighbor state loop during link state routing to the node via the primary interface by detecting a number of routing attempts that has reached the threshold parameter and detecting an available backup interface to the node. The method can further include suspending the primary interface to the node and switching routing to the backup interface. | 12-24-2009 |
20090316571 | Loop Prevention Mechanism for Ethernet Ring Protection - A node (bridge, switch, router) and method are described herein that implement a loop prevention mechanism for Ethernet ring protection. In one embodiment, the loop prevention mechanism can enhance the current draft of the standard ITU-T G.8032 Ethernet Ring Protection Switching. | 12-24-2009 |
20090323517 | AUTOLEARNING NETWORK LINK PROTECTION DEVICE - An apparatus and method for updating a network as to the link used by a protected network device when a first switch for the protected network device fails or is determined to be once again operational. The link protection device builds and transmits an update data packet on a second link for the protected network device that emulates a data packet sent from the protected network device on the second link. | 12-31-2009 |
20100034079 | SERVICE MANAGEMENT IN A NETWORK - In a network ( | 02-11-2010 |
20100085869 | METHOD AND APPARATUS FOR MAINTAINING NETWORK PERFORMANCE IN A COMMUNICATION SYSTEM - A method and apparatus is disclosed for method and apparatus for maintaining network performance in a communication system. A system that incorporates teachings of the present disclosure may include, for example, a network management server (NMS) that manages operations of a communication system including an access office (AO) coupled to a plurality of base terminals (BTs) by way of a corresponding plurality of network elements. The NMS can have a network configuration element that identifies for each of the plurality of BTs a plurality of resultant communication paths to the AO according to a plurality of differential delays calculated from alternative communication paths connecting combinations of the BTs to the AO for each of a plurality of change scenarios affecting the plurality of network elements, wherein the network configuration element arranges portions of the plurality of BTs into a corresponding plurality of groups, and selects for each BT in a select one of the plurality of groups its corresponding plurality of resultant communication paths to the AO according to differential delays calculated for alternative communication paths associated with combinations of BTs in the selected group and the plurality of change scenarios affecting the selected group. Additional embodiments are disclosed. | 04-08-2010 |
20100103813 | PROVISIONED PROVIDER LINK STATE BRIDGING (PLSB) WITH ROUTED BACK-UP - A method of managing traffic flow in a packet network. A working sub-network is provided, which comprises one or more provisioned static working paths between at least one source node and one or more destination nodes in the network, and the working sub-network with a service instance. A backup sub-network is provided, which comprises one or more dynamic protection paths between the at least one source node and the one or more destination nodes, and the backup sub-network associated with the service instance. During a normal operation of the network, forwarding subscriber traffic associated with the service instance through the network using the working sub-network. Following detection of a network failure affecting the service instance, the subscriber traffic associated with the service instance is switched for forwarding through the network using the backup sub-network. | 04-29-2010 |
20100128599 | TELEPHONE SYSTEM, GATEWAY FOR TELEPHONE SYSTEM, AND REDUNDANCY SWITCHING METHOD - According to one embodiment of the invention, there is provided a telephone system comprises gateways used to convert each other's protocols of IP network and PSTN. One of the gateways selectively serves as a main gateway, and the other gateways serve as slave gateways controlled by main gateway. Each of gateways includes a control channel manager, an operation controller and a determination module. Control channel manager of the main gateway controls speech data individually sent and received by gateways, based on a control signal of a control channel of PSTN. Operation controller controls redundancy switching between gateways upon occurrence of a fault. Determination module determines whether or not the fault is a fault associated with control channel. When the fault is a fault associated with control channel, determination module notifies slave gateway of message used to activate control channel manager of any of the slave gateways via IP network. | 05-27-2010 |
20100135152 | ORDERED SWITCHOVER OF CABLE MODEMS - A cable modem termination system (CMTS) provides for ordered switchover of the cable modems it serves when a primary module of the CMTS fails. When the primary module in the CMTS fails, a backup module takes over service of the cable modems. The backup module restores the service flows of the cable modems based on a restoration order determined by session recovery priorities that are related to quality of service levels required by the service flows. In particular, service flows that are engaged in VoIP “911” calls are restored first. Service flows engaged in other VoIP calls are next restored. Lastly, service flows engaged in regular data sessions are restored. | 06-03-2010 |
20100220586 | ROUTE REFLECTOR FOR A COMMUNICATION SYSTEM - A method, system and apparatus for routing of data transmitted from a mobile electronic device to a first host of a plurality of hosts in a communication network using a Border Gateway Protocol (BGP) is provided. It is determined that the first host has failed via receipt of BGP rerouted data at least one network element, the BGP rerouted data originally intended for the first host. A negative acknowledgement (NACK) is transmitted to the mobile electronic device from the at least one network element, the NACK enabled to trigger the mobile electronic device to transmit data that was to be transmitted to the first host to another of the plurality of hosts and wherein the NACK is identifiable by the mobile electronic device as having been transmitted by the at least one network element. | 09-02-2010 |
20100254256 | METHOD FOR EFFICIENTLY TREATING DISTURBANCES IN THE PACKET-BASED TRANSMISSION OF TRAFFIC - A method for efficiently treating disturbances in a packet-based transmission of traffic via a routing protocol and routing entities includes reporting the nonavailability of a neighboring routing entity to a routing entity with regard to the routing by means of the routing protocol, initiating the sending of a test message from the routing entity to the neighboring routing entity for determining availability, wherein, when the nonavailability is confirmed as part of the verification, a failure of the connection to the neighboring routing entity is assumed, and initiating a change in the routing for avoiding the failed connection by the routing entity when nonavailability of the neighboring routing entity is confirmed. | 10-07-2010 |
20100302935 | METHOD AND SYSTEM FOR RESILIENT ROUTING RECONFIGURATION - A method and system for resilient routing reconfiguration, which provides provably congestion-free rerouting under a large number of failure scenarios and achieves efficiency and flexibility in accommodating different performance requirements, is disclosed. The method of embodiments comprises an offline precomputation phase and an online reconfiguration phase. Embodiments of the present invention also provide a number of useful functionalities, including (i) coping with traffic variations, (ii) supporting realistic failure scenarios, (iii) accommodating prioritized traffic with different protection levels, and (iv) balancing the trade-off between performance and resilience. | 12-02-2010 |
20100309777 | NODE APPARATUS, PROCESSING UNIT, AND CONTROL FRAME PROCESSING METHOD - A method for processing a control frame for controlling path protection switching between redundant paths including a working path and a protection path, which is executed at one of two node apparatuses coupled mutually via the redundant paths, the method comprising: at the time of switching of the redundant paths, stopping monitoring whether the control frame has been received via a previous working path which is the path used as the working path until the switching is completed; determining whether the other of the two node apparatuses has stopped transmitting the control frame via a new working path which is the path used as the working path after the switching is completed; and starting monitoring whether the control frame has been received via the new working path, when it is determined that the second apparatus has stopped transmitting the control frame via the new working path. | 12-09-2010 |
20100329111 | Multi-Active Detection Method And Stack Member Device - The present invention discloses a method of multi-active detection and a stack member device. Each member device in a stack is configured with a detection interface that is assigned an IP address, wherein the IP address of the detection interface on the designated active device is activated. Each member devices is also configured with an active device election rule, and with a correspondence between the IP address of the detection interface on each member device and the active device election parameter of the member device. Upon detection that the stack has become split, each designated standby device transitions to become an active device and activates the IP address of its detection interface. Each active device then uses the IP address of its detection interface as the source IP address to establish a session with other active devices, finds the active device election parameter according to the source IP address in the received session packet, and elects an active device that maintains its active state according to the configured active device election rule. The present invention implements multi-active detection in a stack. | 12-30-2010 |
20110013508 | NON-STOP FORWARDING IN A MULTI-CHASSIS ROUTER - State information is synchronized between a plurality of routing engines in a multi-chassis router according to a synchronization gradient. An example multi-chassis router is described that includes a primary routing engine and a standby routing engine in each chassis. According to the synchronization gradient, the primary routing engine of a control node updates state information on the standby routing engine of the control node prior to updating the primary routing engines of the other chassis. The primary routing engines of the other chassis update state information in respective standby routing engines prior to updating state information in consumers. If a primary routing engine fails, the corresponding standby routing engine assumes control of the primary routing engine's duties. Upon assuming control, a standby routing engine resumes updating state information without having to resend state information or interrupt packet forwarding. | 01-20-2011 |
20110019535 | COMPUTER PROGRAM, APPARATUS, AND METHOD FOR MANAGING NETWORK - In response to a route-changing event, original routes on the network are changed to new routes. A destination-reachable range is identified as a range from which packets can reach an information processing device specified by a destination address. Modification of forwarding data is performed for a neighbor communication device which is located outside the destination-reachable range and adjacent to a communication device in the destination-reachable range, so as to enable forwarding of packets to that communication device in the destination-reachable range. The modified forwarding data is then transmitted to the neighbor communication device. The modification made to the forwarding data results in an additional destination-reachable range, which is thus added to the destination-reachable range. Another cycle of processing is then performed on the basis of the expanded destination-reachable range. | 01-27-2011 |
20110038255 | SYSTEM AND METHOD FOR GRACEFUL RESTART - A system for maintaining routing capabilities in a router having a failed control plane provides an active control plane in the router in communication with at least one external node, the active control plane running at least one routing process. A backup control plane may be interconnected with the active control plane, so that the active control plane may periodically transmit synchronization signals to the backup control plane. The backup control plane may update its state based on these synchronization signals. Moreover, the backup control plane may be programmed to take over the routing process of the active control plane if the active control plane fails. | 02-17-2011 |
20110051596 | SYSTEM AND METHOD FOR ENHANCEMENT OF ETHERNET LINK LOSS FORWARDING - A system and method provide enhanced link loss forwarding in an Ethernet system to determine link degradation and to selectively block and re-establish transport between a near end device and far end device based on link status detection using local packets. When an excessive number of errors are detected in an Ethernet port, a device enters a Links Off mode from a Transport mode where Ethernet ports are turned off at both ends of a circuit associated with the errors. A Block Transport mode is then entered where local packets (e.g., OAM packets) are monitored to evaluate link quality. Transport mode is re-established when acceptable link quality is achieved for a selected period of time. | 03-03-2011 |
20110069608 | System for providing backup programming at radio or television transmitter - A system transmits backup programming media in a transmitter station being connected to a remote media station. The media station includes a media programming input to receive a source media signal, which includes media programming. The media station further includes an Ethernet programming input that receives an Ethernet media signal including backup media programming being different the media programming. A transmitter station receives the source media signal via a transmission medium and transmits the media programming. The transmitter station further receives the Ethernet media signal and stores the backup media programming in a storage device. A controller detects a fault on a transmission medium connecting the media station and the transmitting station. The controller retrieves the stored backup media programming and generates a backup media signal. A transmitter transmits the backup media programming based on the backup media signal until it is controlled to re-transmit the source media signal. | 03-24-2011 |
20110075552 | Apparatus and method for controlling data communication - In a communication apparatus, a receive data processor receives data and retrieves a group data record corresponding to the received data out of a group data memory. A forwarding processor forwards the received data according to the group data record retrieved by the receive data processor. The group data memory stores group data records which associate protection group identifiers with path selection data. The protection group identifiers each identify a protection group that provides logical paths constituting a redundant logical path for transporting a group of data, and their corresponding path selection data specifies which logical path to use to forward data in that protection group. | 03-31-2011 |
20110090784 | 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. | 04-21-2011 |
20110090785 | ROUTE SWITCHING METHOD, SERVER, BOUNDARY NODE APPARATUS, ROUTE SWITCHING SYSTEM, AND ROUTE SWITCHING PROGRAM - A route switching method for switching a route in a core network that accommodates service networks including user node apparatuses by use of a server storing path information that includes, in every time frame, a route for a working path and a route for a backup path to be switched over from the working path, both of the working path and the backup path established between two boundary node apparatuses each of which is located on a boundary between the service network and the core network. The server calculates, in response to the connection request from the user node apparatus, a route for a working path and a route for a backup path, and requests the boundary node apparatus to establish this working path. The server can send the route for the backup path to the boundary node apparatus before a failure occurs in the core network. The boundary node apparatus establishes the working path in response to the establishment request for establishing the working path from the server, and can perform a quick recovery by switching over the working path to the backup path when a failure occurs in the core network. | 04-21-2011 |
20110122762 | METHOD FOR UPDATING AN ADDRESS TABLE IN AN ETHERNET RING NETWORK NODE - The present invention provides a method for updating an address table in an Ethernet ring network node and an Ethernet ring network node. When the Ethernet ring network node implements a port state switching operation and a port on the ring is switched from an unblocked state to a blocked state, the Ethernet ring network node updates its forwarding database. The method and the Ethernet ring network node of the present invention can accelerate update of the FDB in the node when a link fails or is recovered, thereby improving the convergence speed for the switching when the ring network fails. | 05-26-2011 |
20110176411 | METHOD FOR PROTECTING A PSEUDO-WIRE - A method and apparatus are provided for establishing a first pseudo-wire between a first item of input terminal equipment and an item of output terminal equipment, used by the first item of input terminal equipment. The method includes a step of transmitting a first message requesting establishment of the first pseudo-wire to an item of switching equipment, the first pseudo-wire to be established consisting of a first link between the first item of input terminal equipment and the item of switching equipment and of a second link between the item of switching equipment and the item of output terminal equipment. In such a method, the first establishment-request message also includes a request to establish at least one backup pseudo-wire consisting of the second link and of a third link to be established between the item of switching equipment and a second item of input terminal equipment. | 07-21-2011 |
20110194404 | SYSTEM AND METHOD FOR FAST PROTECTION OF DUAL-HOMED VIRTUAL PRIVATE LAN SERVICE (VPLS) SPOKES - A novel and useful system and method for fast protection of dual homed Virtual Private LAN Service (VPLS) spokes. Fast protection is achieved by forwarding traffic to the dual homed VPLS spoke from the VSI that is not currently the one currently serving it, as long as the traffic is known unicast. Egress traffic at the VSI that does not currently serve the VPLS-spoke is re-routed over a protection transport entity to the VPLS-spoke through the device of the VSI currently serving it. Broadcast, multicast and unknown (BMU) traffic is sent to the VPLS spoke only by the BMU-primary VSI. BMU frames received at the BMU-secondary VSI are dropped. A fast election process serves to elect the BMU-primary for coordinating between the two VSIs serving the same VPLS spoke. In addition, a flag is inserted in each frame at an ingress VSI to indicate whether the frame is known or unknown unicast. Unknown unicast frames are forwarded to the VPLS spoke only by the BMU-primary. | 08-11-2011 |
20110199891 | System and Method for Protecting Ingress and Egress of a Point-to-Multipoint Label Switched Path - A network comprising a first edge node, a second edge node, a third edge node that backs up either the first edge node or the second edge node, and an internal node coupled to the first edge node, the second edge node, and the third edge node, wherein a point-to-multipoint (P2MP) label switched path (LSP) extends across the network from the first edge node, through the internal node, and to the second edge node, and wherein a LSP sub-tree extends between the third edge node and the internal node, but does not extend across the network. | 08-18-2011 |
20110199892 | GMPLS FAST RE-ROUTE FOR OADM AND AUX 10MBPS SUPPORT - Embodiments of the present invention provide a GMPLS fast re-route of packets within a network using a multicast address and a table comprising a list of alias IP addresses. According to various embodiments of the invention an alternate data path from a source node to a destination node allows a packet to traverse to the destination node without IP forwarding techniques being applied. In other words, a tunneling effect from a source node to a destination node allows other nodes in the network to ignore the packet and only read the multicast address within the header and immediately forward the packet to the destination node. A predetermined set of IP addresses are determined from network topology including all potential paths, for a packet to traverse, to a destination address. | 08-18-2011 |
20110199893 | MOBILE COMMUNICATION METHOD, MOBILE SWITCHING CENTER, AND RADIO BASE STATION - A CSFB processing unit ( | 08-18-2011 |
20110211443 | NETWORK SWITCH WITH BY-PASS TAP - A network switch apparatus includes a first network port, a second network port, a first inline port, a second inline port, wherein the first and second inline ports are for communication with a pass-through device, a packet switch, and a by-pass device configured to operate in a first mode of operation, wherein in the first mode of operation, the by-pass device is configured to pass a first packet received at the first network port to the packet switch. The by-pass device is configured to switch from the first mode of operation to a second mode of operation upon an occurrence of a condition, and wherein in the second mode of operation, the by-pass device is configured to transmit a second packet received at the first network port to the second network port without passing the second packet to the packet switch. | 09-01-2011 |
20110292788 | FRAME DATA COMMUNICATION - A switch node stores reception connection information for identifying the connection of frame data that are received in association with transmission connection information for identifying the connection to which the frame data are to be transmitted, and upon receiving frame data, searches for the transmission connection information that was placed in association with the reception connection information of the frame data that were received and distributes and transmits the frame data to the connection of the transmission connection information that was found. | 12-01-2011 |
20110299385 | NO SPLIT VIRTUAL CHASSIS BASED ON PASS THROUGH MODE - A method includes operating in a normal mode to receive and transmit packets, where the network device is one of multiple network devices that operate as a virtual chassis, where the virtual chassis corresponds to a single logical network device, and detecting when the network device crashes. The method further includes initiating a resetting process and operating in a pass through mode, during the resetting process, where the pass through mode permits packets to be received and transmitted to the network devices of the virtual chassis. | 12-08-2011 |
20110305136 | ACTIVATION SIGNALING IN TRANSPORT NETWORKS - A method comprising the steps of receiving a signal indicative of a failure of a working connection in a mesh network having a headend node, a tailend node and an intermediate node, and having a protecting connection, and transmitting an activation message via the protecting connection from at least one of the headend node and the tailend node to the intermediate node for activating the protecting connection. | 12-15-2011 |
20120008491 | RELAY APPARATUS FOR COMMUNICATION FRAMES AND RELAY METHOD - A layer 2 switch (L2SW) includes (i) a leaned information management unit for recording learned information that associates a receiving port, an address of another L2SW, and a source address specified in the original communication frame, when an encapsulated frame, in which a communication frame has been encapsulated by data containing the address of the another L2SW, is received from the backbone network and (ii) a status monitoring unit. The learned information management unit determines the update extent of the learned information, in accordance with a check result of the connection status and thus the occurrence of flooding transfer to a backbone networks side is suppressed. | 01-12-2012 |
20120057452 | 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. | 03-08-2012 |
20120063299 | HIGHLY AVAILABLE VIRTUAL PACKET NETWORK DEVICE - A virtual chassis includes two or more physical chassis and operates as a single, logical device. Each of the two or more physical chassis include two route processor modules (RPM) and each RPM is assigned a first and a second role within the virtual chassis. The first role is a physical chassis level role and the second role is a virtual chassis level role. The RPMs operate in coordination such that the failure of any one of the RPMs results in one or more other RPMs taking over the first and second roles of the failed RPM. | 03-15-2012 |
20120069730 | SYSTEM AND METHOD FOR SUPPORTING MANAGEMENT NETWORK INTERFACE CARD PORT FAILOVER IN A MIDDLEWARE MACHINE ENVIRONMENT - A system and method can support virtual network interface card (NIC) failover in a middleware machine environment. The middleware machine environment includes a local management node and a remote management node. The system provides a local NIC driver and a remote proxy instance on a local management node. The remote proxy instance can associate a machine address with a remote NIC driver on a remote management node that is connected with the local remote management node in a subnet. Furthermore, the remote proxy instance operates to direct packets to and from the remote NIC driver using the machine address. | 03-22-2012 |
20120075988 | FAST FLOODING BASED FAST CONVERGENCE TO RECOVER FROM NETWORK FAILURES - A router detects a network failure and responsive to that failure, floods a fast failure notification message out a set of interfaces of the router. The fast failure notification message includes information that identifies the network failure and includes as its source MAC (Media Access Control) address a MAC address that is assigned to an interface that is coupled with the detected network failure and is not part of the set of interfaces of the router. The router updates a routing table to reflect the network failure. The flooding of the fast failure notification message is performed prior to completion of the routing table update to reflect the network failure. | 03-29-2012 |
20120082025 | PROTECTING MULTI-SEGMENT PSEUDOWIRES - The protection of multi-segment pseudowires by utilizing backup paths is disclosed herein. Disclosed embodiments include methods that establish at least one backup path for multi-segment pseudowires, the establishing being performed prior to detection of failure in the primary path. Upon detecting a path failure, the detected failure is signaled to the head-end, a backup path is chosen, and reachability information associated with the chosen backup path is signaled across the backup path before reverse traffic is switched to the backup path. In other disclosed embodiments, apparatus are configured to establish, prior to detection of failure in the primary path, at least one backup path for the multi-segment pseudowire. | 04-05-2012 |
20120127854 | METHOD OF SHRINKING A DATA LOSS WINDOW IN A PACKET NETWORK DEVICE - A packet network device includes a control module, one or more line cards each one or which includes a plurality of ingress and egress ports, and each of the ingress and egress ports are connected to external network links. The line cards maintain forwarding tables and include functionality that employs information in the forwarding tables to determine how incoming packets of information should be forwarded. The control module includes functionality that operates to learn reachability information about other devices connected to the network that are and to use this reachability information to update forwarding tables maintained on the line cards. The control module also includes an enhance ARP functionality that operates in cooperation with standard ARP functionality and other network protocols included on the control module to diminish the amount of data lost in the event that a link connected to one of the egress ports fails. | 05-24-2012 |
20120127855 | METHOD AND DEVICE FOR CONVEYING TRAFFIC - A method and a device for conveying traffic are provided, wherein a master node is connected to a first slave node and to a second slave node; wherein the first slave node and the second slave node comprise a connection; wherein traffic is conveyed between the master node and the first slave node; and wherein in case of a fault condition the traffic is conveyed between the master node and the first slave node via the second slave node and the direct connection between the first slave node and the second slave node. Furthermore, a communication system is suggested comprising said device. | 05-24-2012 |
20120134257 | ROUTER AND RAPID RESPONSE NETWORK - A router includes a plurality of wireless network carrier cards, each of the network carrier cards adapted for use with one of a like plurality of different carrier networks, means for determining which of the plurality of network carrier cards provides a suitable connection to a carrier network and means for selecting one or more suitable connections to one or more carrier networks and for connecting the EVDO router to the carrier network through a particular one of the plurality of network carrier cards and a load balancing processor for load balancing between a plurality of different backbone networks and wherein the load balancing processor directs traffic among multiple networks to provide a desired throughput. In one embodiment, the router is provided as an evolution-data optimized (EVDO) wireless router. | 05-31-2012 |
20120134258 | METHOD, APPARATUS, AND SYSTEM FOR ACTIVE-STANDBY SWITCHOVER - The present invention relates to the field of communication technologies and discloses a method, an apparatus, and a system for active-standby switchover. The method includes: copying at least one packet group to a standby board; recording the copied packet group and generating a transmission rule chain table of an active board according to a sequence of copying, so that the standby board generates a transmission rule chain table of the standby board which is the same as the active transmission rule chain according to the sequence of copying; and transmitting the packet group according to the sequence of the transmission rule chain table of the active board. By using the method, resuming transmission from a breakpoint upon an active-standby switchover is enabled. | 05-31-2012 |
20120147736 | Minimizing the Number of Not-Via Addresses - In an embodiment, a method comprises determining a set of protected components that are associated with a notifying node; determining a single network repair address for the set of protected components, wherein the single network repair address is for use in response to unavailability of any of the protected components when transmitting network traffic to the notifying node; assigning the single network repair address to each of the protected components; wherein the notifying node is an internetworking device and wherein the method is performed by one or more processors. | 06-14-2012 |
20120163162 | SPLIT MULTI-LINK TRUNKING (SMLT) HOLD-DOWN TIMER FOR INTERNET PROTOCOL (IP) MULTICAST - A method, apparatus and computer program product for providing mulitcast failover and recovery which minimizes lost packets is presented. A first network device returns to a fully active state and starts a multicast hold-down timer. A first message is sent to a second network device, the message indicating at least one Split Multi Link Trunk (SMLT) Virtual Local Area Network (VLAN) Identifier (ID) correlating to the multicast hold-down timer. The first network device receives an acknowledgment of said first message and Layer 2 forwards multicast data traffic to said second network device until the timer expires, whereupon the first device is capable of handling its own multicast data traffic, and then has Layer 2 bridging turned off and enables IP multicast routing. During the period of multicast hold-down timer, the second device will perform IP multicast forwarding on behalf of the first device. | 06-28-2012 |
20120163163 | APPARATUS AND METHOD FOR PROTECTION SWITCHING OF MULTIPLE PROTECTION GROUP - There is provided a protection switching apparatus including: a path management unit to establish a plurality of connection paths for transmitting/receiving packets, and a plurality of protection paths that are able to substitute for the plurality of connection paths, respectively, and to create a protection group including the connection paths and the protection paths; a protection group controller to determine whether failure has occurred on the connection paths, based on path state information for each path included in the protection group, the path state information stored in the protection group table storage, and to issue an instruction for protection switching, according to the result of the determination; and a protection switching unit to perform protection switching of a path in which failure has occurred to a protection path corresponding to the path in which failure has occurred, according to the instruction for protection switching. | 06-28-2012 |
20120170447 | METHOD OF AGGREGATING CONVENTIONAL RESOURCES UPON LOSING CONNECTIVITY TO A MASTER SYSTEM SITE - Communication systems and methods are presented for aggregating sites when connectivity to a core and zone controller therein is lost. A local controller provides multicast control to sub-sites within a locally aggregated network after detecting loss of connectivity to the core. The local controller assigns different multicast addresses than multicast addresses assigned by the zone controller. A sparse and dense mode protocol is used for multicast traffic outside and within the locally aggregated network, respectively. Conventional resources, but not trunked resources, are assigned addresses and groups. An isolated site is able to connect to the network in the event of core failure so that conventional multicast traffic traverses a direct link between each isolated site and the network, thereby extending the locally aggregated network. Multicast addresses available to be assigned by a local controller within any locally aggregated networks can be the same as those assigned by other local controllers. | 07-05-2012 |
20120176890 | METHOD AND APPARATUS FOR USING G.8031 EXTENSIONS TO ENABLE COEXISTENCE OF G.8031-BASED PROTECTION AND LAG-LIKE LOADSHARING FOR ETHERNET PATHS - An Ethernet protection and loadsharing capability is provided. The Ethernet protection and loadsharing capability enables co-existence of both protection and loadsharing for an Ethernet tunnel, having a plurality of associated Ethernet paths, between first and second Ethernet switches. The first Ethernet switch receives configuration information associated with the Ethernet tunnel between the first and second Ethernet switches, and processes the configuration information for causing the first Ethernet switch to associate the Ethernet paths of the Ethernet tunnel with an Ethernet tunnel endpoint object associated with an Ethernet tunnel. The first Ethernet switch, upon receiving traffic intended for the second Ethernet switch, propagates the traffic from the first Ethernet switch toward the second Ethernet switch via at least a subset of the Ethernet paths of the Ethernet tunnel using protection and/or loadsharing. | 07-12-2012 |
20120188867 | RECOVERY OF TRAFFIC IN A CONNECTION-ORIENTED NETWORK - A connection-oriented network ( | 07-26-2012 |
20120201123 | HITLESS SWITCHOVER AND BANDWIDTH SHARING IN A COMMUNICATION NETWORK - Described is a node comprising a switch fabric and first and second ingress modules. The first ingress module receives a first stream of packets from a first physical path through the network; forwards a copy of the first stream of packets to an intermodule communication channel; selects packets from the first stream of packets and a copy of a second stream of packets for forwarding to the switch fabric. The second ingress module receives the second stream of packets from a second physical path through the network; forwards the copy of the second stream of packets to the intermodule communication channel; and selects packets from the copy of the first stream of packets and the second stream of packets for forwarding to the switch fabric based on sequence numbers in the packets. | 08-09-2012 |
20120207013 | SYSTEM AND METHOD FOR MANAGING TRACKING AREA IDENTITY LISTS IN A MOBILE NETWORK ENVIRONMENT - A method is provided in one example embodiment and includes communicating a plurality of queries associated with common tracking areas in a wireless network; identifying a set of serving gateways that serve the common tracking areas; generating a tracking area identity (TAI) list to be used in provisioning network resources for user equipment; and selecting a first serving gateway from the set of serving gateways for the user equipment, wherein the first serving gateway is selected based on the common tracking areas served by the set of serving gateways. In more specific embodiments, the queries are domain name system (DNS) queries that are supported by a network element and that have no cached DNS response. | 08-16-2012 |
20120207014 | SYSTEM AND METHOD FOR ETHERNET PROTECTION SWITCHING IN A PROVIDER BACKBONE BRIDGING TRAFFIC ENGINEERING DOMAIN - A method of providing protection switching on a backbone network includes configuring a service instance table for a first port of a first bridge. The service instance table includes a Virtual Local Access Network (VLAN) identifier entry for one or more service instances. The method also includes mapping data traffic received at the first bridge onto a first trunk by setting a VLAN identifier entry for a first service instance and transmitting data traffic to a second bridge on the first trunk in accordance with the mapping and monitoring the first trunk for faults by exchanging continuity check messages with the second bridge over the first trunk. The method additionally includes, upon detecting a fault, remapping data traffic for the first service instance by changing the VLAN identifier entry for the first service instance and transmitting data traffic to the second bridge in accordance with the remapping. | 08-16-2012 |
20120230183 | METHOD AND APPARATUS FOR IMPLEMENTING CONTROL OF MULTIPLE PHYSICALLY DUAL HOMED DEVICES - A ring control protocol is used to establish a separate control plane for a plurality of physically dual homed devices to enable collections of dual homed devices to be represented by a single pair of addresses into the attached routed Ethernet network. The gateway devices analyze the passing ring control packets to create direct mappings for data packets to the routed Ethernet network. Thus, although the dual homed devices are treated as a ring from a control perspective, the data path is implemented to be direct so that data packets continue to flow directly from the dual homed devices to each of the attached gateway devices. In one embodiment, each of the gateway devices implements a virtual switch and advertises the MAC address of the virtual switch into the routed Ethernet network rather than the MAC addresses of each of the attached Ethernet Switch Units. | 09-13-2012 |
20120250497 | METHODS FOR SENDING AND PROCESSING AN SIP RESPONSE - Devices, systems, and methods for sending and processing session initiation protocol (SIP) responses are disclosed. According to one aspect, a method for sending an SIP response through a first telecommunications network node is described. The method includes receiving, by means of the first node, a SIP request sent by means of a second node of the network. The method includes detecting an event that interferes with processing of said request by means of the first node. The method further includes sending, to the second node, a SIP response notifying said interference. The method also includes, before the sending step, activating, within the SIP response, a parameter that allows the request to be rerouted, said parameter being configurable by means of the second node. | 10-04-2012 |
20120287777 | DYNAMICALLY UPDATING ROUTING INFORMATION WHILE AVOIDING DEADLOCKS AND PRESERVING PACKET ORDER AFTER A LINK ERROR - A system for allowing dynamic changing of routing information of a network interconnect while avoiding deadlocks and preserving packet ordering. A network resiliency system detects when an error in the network interconnect occurs and dynamically generates new routing information for the routers that factors in the detected error. The network resiliency system then generates new routing information that factors in the failure. The network resiliency system then directs the network interconnect to enter a quiescent state in which no packets are transiting through the network interconnect. After the network interconnect enters the quiescent state, the network resiliency system directs the loading of the new routing information into the routing tables of the network interconnect and then directs the network interconnect to start injecting request packets into the network interconnect. | 11-15-2012 |
20120294141 | METHOD FOR IMPLEMENTING PROTECTION GROUP OVERLAY, AND METHOD AND SYSTEM FOR ETHERNET PROTECTION SWITCHING - This disclosure discloses a method for implementing protection group overlay and a method for implementing Ethernet protection switching based on the protection group overlay. The method for implementing Ethernet protection switching based on the protection group overlay comprises: when the fault of TESI is detected by multiple IPG which protect the same TESI, only one IPG of the multiple nested IPGs performs protection switching. This disclosure further discloses a system for implementing Ethernet protection switching based on the protection group overlay, comprising a protection switching performing unit, configured to when a fault of a TESI is detected by multiple IPGs which protect the TESI, only one IPG of the multiple nested IPGs performing protection switching. Application of the method and system of this disclosure implements protection for key protected path through protection group overlay, and can achieve effects of saving network resource and increasing utilization rate of network resource. | 11-22-2012 |
20120300617 | Method and Apparatus for Protecting Tunnel - The present invention discloses a method and an apparatus for protecting a tunnel, wherein the method comprises: setting a second protection group on two intermediate nodes of a first protection group; when a segment between the two intermediate nodes fails, adopting the second protection group to protect the tunnel. The present invention solves the problem in a relevant art that it is very difficult to configure multiple protection segments for one working segment and it might be limited by various conditions, such as network resources and the like; therefore, the utilization rate and the reliability of the network resources are improved. | 11-29-2012 |
20120307623 | Method and Apparatus Providing Selective Flow Redistribution Across Multi Link Trunk/Link Aggregation Group (MLT/LAG) After Port Member Failure and Recovery - A method, apparatus and computer program product are presented. In a system having at least one Multi Link Trunk/Link Aggregation Group (MLT/LAG), a table is provided for each MLT/LAG, each table having at least one entry, each entry including at least two fields, a first field comprising a port member identification (ID) field and a second field comprising a port member status field. A port member status is checked for a port when a packet flow hashes into the table, and the status for the port member is determined. When the port member status is in a first state, then the associated port member ID is used as a destination port to transmit to. When the port member state is in a second state, then a next entry in the port table is accessed to find a next available entry having a port member status that is in the first state and the corresponding port member ID of the port member state that is in the first state is used as a destination port to transmit to. The first state is UP and the second state is DOWN. | 12-06-2012 |
20120314564 | CASCADE SYSTEM FOR NETWORK UNITS - In one embodiment, a method is described for detecting an operational failure between the network unit and an adjacent network unit in the stack; controlling the switching engine to redirect packets which would otherwise be sent from a particular port to the adjacent network unit to be forwarded from another port to be sent to a different network unit in the stack; and entering the switching engine into a bypass mode in response to control data indicating an operational failure between at least two other network units in the stack to cause packets to be forwarded without being re-directed by the switching engine. | 12-13-2012 |
20120320736 | Providing resilient digital telephony services for wireless device - A system and method for providing resilient digital telephony services for wireless communication devices are disclosed. The system comprises a plurality of wireless communication devices and a border gateway serving a communications network that is configured to communicate with the wireless communication devices. At least two telephony servers are located in the communications network. The servers are configured to communicate with at least a portion of the wireless communication devices. A heartbeat module is configured to communicate heartbeat signals between the border gateway and the telephony servers and redirect service in the event of a server failure. | 12-20-2012 |
20120320737 | METHOD AND APPARATUS FOR LOSSLESS LINK RECOVERY BETWEEN TWO DEVICES INTERCONNECTED VIA MULTI LINK TRUNK/LINK AGGREGATION GROUP (MLT/LAG) - A method, apparatus and computer readable medium for maintaining two variables per port member of a network device which is part of a Split Multi Link Trunk/Link Aggregation Group (SMLT/LAG) is presented. A first variable comprising a link status variable reflecting a link status, and a second variable comprising a forwarding status variable reflecting a forwarding status of a forwarding plane with respect to the port are provided, the link status variable and the forwarding status variable in a first state when the port is operating properly. A failure related to the port is detected. The link status variable is set to a second state, and the forwarding status variable is set to a second state. | 12-20-2012 |
20130010588 | High Availability Device Level Ring Backplane - A modular, high-availability network for an industrial control system employs a plurality of base modules having backplane and using network ring topology. Base modules may include I/O base modules for communicating with industrial processes or machines, an adapter base module for communicating with a programmable logic controller (PLC) and/or a bus expansion base module for providing additional I/O base modules. Base modules may be arranged side-by-side, having a backplane in a bank. Another embodiment may include having plurality of banks. The network ring topology used by the base modules is normally opened by a ring supervisor at the ring supervisor location. Upon failure of the network, the ring supervisor reconnects the ring to provide an alternative transmission path around the failure point. | 01-10-2013 |
20130028072 | METHOD AND SYSTEM FOR MANAGEMENT OF FLOOD TRAFFIC OVER MULTIPLE 0:N LINK AGGREGATION GROUPS - In accordance with embodiments of the present disclosure, a method and system may include receiving a plurality of packets comprising flood traffic of a bridged VLAN domain at an ingress line card port. The system and method may further include splitting the packets into multiple internal streams and forwarding the packets associated with the internal streams to a switch fabric. The system and method may further include forwarding each packet associated with a particular internal stream to one or more egress line cards associated with the internal stream. The system and method may further include mapping each internal stream to a single egress port of the egress line card, the single egress port comprising one of a plurality of egress ports associated with a LAG. The system and method may further include recovery from a port failure. | 01-31-2013 |
20130028073 | Controller Placement for Fast Failover in the Split Architecture - A method implemented by a network topology design system, the network topology design system including a processing device. The method to determine placement of a controller within a network with a split architecture where control plane components of the split architecture network are executed by a controller and the control plane components are separate from data plane components of the split architecture network. The placement of the controller is selected to minimize disruption of the split architecture network caused by a link failure, a switch failure or a connectivity loss between the controller and the data plane components | 01-31-2013 |
20130028074 | METHOD AND APPARATUS FOR PROTECTING A COMMUNICATION NETWORK AGAINST FAILURE - A method for protecting a communication network against failure, comprising the steps of: a) obtaining a primary network, represented by a graph of nodes and links, wherein each link has an associated capacity; b) computing a backup network, that includes nodes of the primary network and links that are not in the primary network; c) when a link of the primary network fails, rerouting communication traffic, through one or more links of the backup network, in order to bypass the failed link. Methods are suggested to determine the backup network, one method relates to expressing the objective and constraints on the backup network as linear or integer expressions, and a linear or integer programming tool is used to solve the equation system and provide optimal backup network. | 01-31-2013 |
20130044586 | FASTER FAILOVERS FOR FAST REROUTE (FRR) LSPs - Techniques for reducing the latency in performing a failover from a protected connection to its backup connection when a network event is detected affecting the protected connection. In an MPLS network, techniques are provided for failing a protected LSP to a backup LSP in a fast and efficient manner. In one embodiment, the faster failover is facilitated by storing protected LSPs and their backup LSPs information in the data plane, such as locally on a linecard. | 02-21-2013 |
20130051218 | SYSTEM AND METHOD FOR ASSURING THE OPERATION OF NETWORK DEVICES IN BRIDGED NETWORKS - In one embodiment, a spanning tree protocol (STP) is executed to assign a first port of an intermediate network device to a Root Port Role, a second port of the intermediate network device to an Alternate Port Role, a third port of the intermediate network device to a Designated Port Role, and a fourth port of the intermediate network device to a Backup Port Role. At least one bridge protocol data unit (BPDU) message is periodically sent from the first port assigned Root Port Role, the second port assigned Alternate Port Role and the fourth port assigned Backup Port Role, irrespective of receipt of any BPDU messages from neighboring intermediate network devices. In response to a failure to receive a BPDU message from a neighboring intermediate network device on the third port assigned Designated Port Role within a threshold amount of time, one or more actions are taken. | 02-28-2013 |
20130064067 | HIGH AVAILABILITY DISTRIBUTED FABRIC PROTOCOL (DFP) SWITCHING NETWORK ARCHITECTURE - In a switching network, each of a plurality of lower tier entities is coupled to each of multiple master switches at an upper tier by a respective one of multiple links. At each of the multiple master switches, a plurality of virtual ports each corresponding to a respective one of a plurality of remote physical interfaces (RPIs) at the lower tier are implemented on each of a plurality of ports. Each of the plurality of lower tier entities implements a respective egress port mapping indicating which of its plurality of RPIs transmits egress data traffic through each of its multiple links to the multiple master switches. In response to failure of one of the multiple links coupling a particular lower tier entity to a particular master switch, the particular lower tier entity updates its egress port mapping to redirect egress data traffic to another of the multiple master switches without packet dropping. | 03-14-2013 |
20130077470 | Method For Applying Macro-Controls Onto IP Networks Using Intelligent Route Indexing - Systems and methods are described that manage routing information in an IP network using extensible indexing and use the indexing to control the network. The indexing and associated controls apply to any router within the routing domain. | 03-28-2013 |
20130083650 | METHOD FOR HANDLING FAILURE OF A MME IN A LTE/EPC NETWORK - Method for handling failure of a MME (Mobility Management Entity) in a Long Term Evolution/Evolved Packet Core network or an Evolved Packet System, wherein multiple UEs (User Equipment) are attached to a first MME, which stores first context information representing the UEs attached to the first MME, the UEs are connected to one of multiple eNBs (evolved NodeB), the eNB may communicate with the first MME and with at least one neighboring MME, and the UEs may communicate with the first MME and with the at least one neighboring MME via the eNB, includes: detecting failure of the first MME, gathering information related to UEs attached to the first MME, restoring parts of the first context information at one or several of the neighboring MME using the gathered information, and re-establishing network internal logical connections with the one or several of the neighboring MME using the restored first context information. | 04-04-2013 |
20130088953 | Failure Detection in the Multiprotocol Label Switching Multicast Label Switched Path's End-to-End Protection Solution - In one aspect, the invention includes, in a root node along a secondary label switching path, a computer program product comprising computer executable instructions stored on a non-transitory medium that when executed by a processor cause the root node to perform the following: establish a first data plane based failure detection session having an inactive status along a first label switching path (LSP) with at least one leaf node, receive a predetermined number of notification messages from the leaf node, wherein the predetermined number of notification messages indicate the failure of a second data plane based failure detection session along a second LSP from a second processor to the leaf node, and change the status of the first data plane based failure detection session to active along the first LSP upon receipt of the predetermined number of notification messages. | 04-11-2013 |
20130100798 | METHOD, NETWORK CARD, AND COMMUNICATION SYSTEM FOR BINDING PHYSICAL NETWORK PORTS - A method for binding physical network ports includes creating a virtual port, where the virtual port corresponds to a virtual network card in an application layer and is capable of being bound, in the application layer, with other created virtual ports through application layer software. The method also includes adding, to the created virtual port, multiple physical network ports, which need to be bound. When communications of the physical network ports in the virtual port is normal, the method includes identifying the physical network ports as being available. When a packet needs to be received or transmitted, the method includes selecting one or more physical network port from the available physical network ports according to a configured mode to receive or transmit the packet. | 04-25-2013 |
20130107698 | IP FAST REROUTE SCHEME OFFERING FULL PROTECTION | 05-02-2013 |
20130128720 | METHOD AND APPARATUS FOR PROTECTION SWITCHING IN POINT-TO-MULTIPOINT NETWORK - A method of performing protection switching in a network including a first node and a plurality of second nodes that are connected to the first node is provided. The first node counts the number of obstacles that have occurred in a plurality of paths that are connected between the plurality of second nodes, and if the counted number is smaller than a predetermined threshold value, the first node performs protection switching per leaf. Alternatively, if the counted number is equal to or larger than a predetermined threshold value, the first node performs protection switching per tree. | 05-23-2013 |
20130128721 | SYSTEM TO IMPROVE AN ETHERNET NETWORK - A system to improve a Fibre Channel over Convergence Enhanced Ethernet (FCoCEE) network may include a sender in an FCoCEE network in which data packets having different data link layer structures are transmitted by the sender on a single data link. The system may also include a receiver to receive the data packets at the data link layer and to transmit an ACK and/or NAK in response to a sequence number in the data packets. The system may further include a replay buffer to retransmit the data packets where the replay buffer is sized by the length of the data link, data rate of the data link, the ACK and/or NAK processing time at either the sender and/or the receiver, and/or a threshold time for transmission and/or reception of the data packets. | 05-23-2013 |
20130142034 | NETWORK DEVICE AND METHOD OF ROUTING TRAFFIC - A method for routing switch is disclosed. The method comprises: when a network device forwards traffic through N equal-cost multi-path (ECMP) routes to a destination, if M of these routes are inactive, then for each inactive route, determining an alternative route for replacing the inactive route from N-M active routes, and modifying the inactive route to the alternative route so as to switch the traffic of the inactive route onto the alternative route, wherein N and M are positive integer numbers, with N being greater than or equal to 2 and M being greater than or equal to 1 and smaller than N. | 06-06-2013 |
20130148492 | Method of Handling Delayed Signaling of Target Mobile device - A method of handling delayed signaling of a target mobile device for a first network control node is disclosed. The method comprises the first network control node receiving a request from a network gateway node; the registered network control node setting a flag and informing a data base to set the flag for the target mobile device when the first network control node fails to deliver the request to the target mobile device; and the first network control node sending the flag to a second network control node when the target mobile device is reachable in the second network control node. | 06-13-2013 |
20130155841 | SELECTING A MASTER PROCESSOR FROM AN AMBIGUOUS PEER GROUP - A distributed switch may include a plurality of special-purpose processors that control the different functions of the switch. To enable some special services, however, the distributed switch may need one of these processors to perform the role of a master. When a processor is powered on, the processor may publish a corresponding unique ID. Before electing the master, the special-purpose processors may use a discovery process to identify the network topology of the switch and evaluate the published IDs to determine which processor should be the master. If all the processors nominate the same master processor, then that processor is elected as the master and may finish configuring the distributed switch to enable the special services. | 06-20-2013 |
20130170335 | SYSTEM AND METHOD FOR CONVERGENCE AND AUTOMATIC DISABLING OF ACCESS POINTS IN A WIRELESS MESH NETWORK - One embodiment of the present disclosure sets forth a technique for convergence and automatic disabling of access points in a wireless mesh network. Specifically, an access point within a wireless mesh network computes one or more network metrics to determine whether the metrics are unfavorable or favorable. If the network metrics are favorable, then the access point disables the access point's network connection. An access point turns the network connection back on based on whether a routing was lost for at least a preset amount of time, utilization of one or more neighboring access points is above a preset value, or one or more network metrics have degraded by a certain percentage value. One advantage of this approach is that cost savings may be achieved when the number of access points dynamically changes to accommodate varying communications conditions. | 07-04-2013 |
20130176843 | ROUTING PROTOCOLS FOR ACCOMMODATING NODES WITH REDUNDANT ROUTING FACILITIES - Graceful restart in routers having redundant routing facilities may be accomplished by replicating network (state/topology) information. | 07-11-2013 |
20130182559 | TRANSMISSION NETWORK AND TRANSMISSION NETWORK MANAGEMENT SYSTEM - A transmission network is comprised of a network management system for collectively managing and controlling a plurality of transmission devices coupled mutually through transmission routes and the transmission network as well. The network management system includes a plane management table adapted to manage transmission planes defined as a set of paths in the transmission network, and the plane management table has the function to set and manage a transmission plane (working plane) applied during normal operation and besides, a single or a plurality of transmission planes (protection planes) applicable in the event of occurrence of a fault in the transmission network. Then, when a fault occurs in the transmission network, the network management system changes the applied plane to a suitable transmission plane. | 07-18-2013 |
20130188474 | PAGING PROCESSING METHOD AND SYSTEM, SERVING GATEWAY - The embodiments of the present invention provide a paging processing method and system and also a serving gateway. The paging processing method includes: detecting, by a serving gateway, a fault of a mobility management element, determining a type of the fault, and reselecting a mobility management element according to the type of the fault; and sending, by the serving gateway, a downlink data notification message to the reselected mobility management element, whereupon the reselected mobility management element sends a paging message to a user equipment UE that is served by the faulty mobility management element before the fault occurs. With the method, system and serving gateway provided in the embodiments of the present invention, user experience is improved effectively. | 07-25-2013 |
20130201818 | METHOD FOR MANAGING A DEGRADED MODE OF A CELL IN A RADIOCOMMUNICATION NETWORK - A method for managing a degraded mode of a cell of a cellular network including a site controller for controlling, via a packet network, transmitters distributed over various sites of the cell such that transmitters implementing the same pair of frequencies over different sites form a channel which, in dynamic mode, is allocated dynamically to any communication between terminals of the cell, the channel including a master transmitter selected by the controller. The method includes, in each master transmitter on detection of a failure of the controller: switching in degraded mode of the master transmitter, by associating with the channel a predefined communication known to the terminals, and transmission from the master transmitter, via the network, of a control message informing a control console connected to the packet network of the implementation of the degraded mode so that the console participates in a communication underway in the channel. | 08-08-2013 |
20130208582 | SYSTEM AND METHOD FOR MULTIPOINT LABEL DISTRIBUTION PROTOCOL NODE PROTECTION USING A TARGETED SESSION IN A NETWORK ENVIRONMENT - A method is provided in one example and includes receiving first address information from a protected node over a first label switched path having a first label. The first address information is associated with a first network element. A second label switched path has been previously established with the first network element. The method further includes establishing a targeted session with the first network element, assigning a second label to the second label switched path, and sending the second label to the first network element over the targeted session. | 08-15-2013 |
20130223204 | Communication Device for a Redundantly Operable Industrial Communication Network and Method for Operating the Communication Device - A communication device for a redundantly operable industrial communication network comprises at least one first and one second transmitting and receiving unit each having an interface for a network connection of the industrial communication network. A signal processing unit is connected to the first and second transmitting and receiving units. A singly linked network node is connected to the signal processing unit via a coupling element. The signal processing unit is connected to the coupling element via a first and second interface. In this case, the first interface is provided exclusively for communicating data packets received by the first receiving unit, while the second interface is provided exclusively for communicating data packets received by the second receiving unit. | 08-29-2013 |
20130229910 | SYSTEM, METHOD, APPARATUS, AND COMPUTER PROGRAM PRODUCT FOR PROVIDING NETWORK CONNECTIVITY - A method for providing network connectivity is provided. The method may include interfacing with a wireless mesh network. The method may further include interfacing with one or more network link devices configured to establish a wireless connection to an external network. The method may additionally include routing outbound traffic received via the mesh network and intended for a destination accessible via the external network toward a selected one of the one or more bridge nodes for delivery via the external network. The method may also include routing inbound traffic received via one of the one or more bridge nodes from the external network toward a destination accessible via the mesh network. A corresponding system, apparatus, and computer program product are also provided. | 09-05-2013 |
20130242718 | METHOD AND APPARATUS PROVIDING NETWORK REDUNDANCY AND HIGH AVAILABILITY TO REMOTE NETWORK NODES - A method, apparatus and computer program product is presented. A first tunnel is provided across a layer 3 network from a first network device to a second network device. A first virtual interface (VI) is provided on the second network device, and assigned to the first tunnel. Information related to the first tunnel and the first VI is passed to a third network device, which is a member of a cluster with the second network device. A second tunnel is provided across the layer 3 network from the third device to the first network device, and a second virtual interface (VI) is provided on the third network device, and assigned to the second tunnel. Forwarding information is exchanged between the second network device and the third network device. The second network device and the third network device provide forwarding redundancy service to the first network device. | 09-19-2013 |
20130242719 | Method and Apparatus for Backup Communication Services - A method and apparatus is disclosed for backup communication services. An apparatus that incorporates teachings of the present disclosure may include, for example, a wireless interface having a detection module to detect an interruption in a portion of communication services supplied to a plurality of residences by a central office over communication lines coupled to a cross-connect operating in a service area interface (SAI), and a controller module to direct a wireless transceiver to establish communications with a wireless station in response to the interruption, and to direct the cross-connect to provide communication services to a portion of the plurality of residences affected by the interruption by way of the wireless transceiver. Additional embodiments are disclosed. | 09-19-2013 |
20130258837 | PSEUDOWIRE EXTENDED GROUP ACTIONS IN A PACKET SWITCHED NETWORK - Embodiments of the invention are directed to extended psuedowire groups in a packet switched network. Embodiments associate a pseudowire to one or more groups at each provider edge device across which the pseudowire traverses. When a pseudowire set-up request message traverses across various provider edge devices, each provider edge device typically adds one or more local group membership information elements into the pseudowire set-up request message. In that way the grouping assigned by each provider edge device that the pseudowire traverses is made available to all other provider edge devices traversed by the pseudowire. Advantageously, this availability pseudowire grouping information allows any of these provider edge devices to initiate a wildcard message to notify other provider edge devices with respect to pseudowires in any of its local groups, as well as allowing a pseudowire to be bound to multiple groups based on various requirements. | 10-03-2013 |
20130258838 | MINIMAL DATA LOSS LOAD BALANCING ON LINK AGGREGATION GROUPS - An example embodiment includes a network element. The network element includes an ingress port, an ingress line card, a link aggregation group (LAG) including multiple egress ports, and a distributor. The ingress port receives multiple packets including flood traffic. The ingress line card separates the packets into buckets. The distributor is configured to allocate the buckets to the egress ports, transmit the buckets to the egress ports, and when a failed egress port is identified, reallocate the buckets from the failed egress port to at least one functional egress port while continuing to transmit the buckets to functional egress ports of the LAG. | 10-03-2013 |
20130272113 | CHASSIS TYPE SWITCH - A chassis type switch is provided which can shorten a time required for switching-over to a backup route when a failure has occurred in a line card. In a chassis type switch including a plurality of line cards within a chassis, the switch further includes a failure detection unit for detecting a failure in each of the plural line cards, and a forced flooding processing unit included in each of the plural line cards and operating such that when, in trying to transfer a received unicast frame to another line card, a failure is detected in the relevant line card at a transfer destination, the received unicast frame is forcibly transferred to all ports of the own line card other than a reception port thereof and to all other line cards. | 10-17-2013 |
20130279320 | FAILOVER PROCEDURE FOR NETWORKS - In an example embodiment, there is disclosed an apparatus comprising a plurality of ports and routing logic coupled with the plurality of ports. The routing logic obtains data representative of a first port configuration for the plurality of ports, the first port configuration comprises data representative of a status for individual ports selected from the plurality of ports, the status indicating whether an individual port selected from the plurality of ports is an open port, an alternate port, or a failed port. The routing logic forwards data in accordance with the first port configuration. The routing logic also obtains data representative of an alternate port configuration for the plurality of ports, the alternate port configuration is to be employed upon determining a predefined link has failed. The alternate configuration comprising a new status for individual ports selected from the plurality of ports. | 10-24-2013 |
20130286815 | TELECOMMUNICATIONS EQUIPMENT - Telecommunications equipment includes first and second signal processing modules each including one or more line interface units, the first and second signal processing modules being arranged to be activated dependent on a failover state of the first and second signal processing modules. The telecommunications equipment further includes a plurality of external connectors and a plurality of isolation transformers arranged in one or more signal paths connected to the external connectors. Additionally, a first equipment housing includes at least the first and second signal processing modules and at least one further equipment housing includes at least the external connectors and isolation transformers. | 10-31-2013 |
20130286816 | COMMUNICATING DATA UNITS IN A COMMUNICATIONS NETWORK THAT PROVIDES FAILURE PROTECTION - A node comprises a first communications interface to a customer network element, where the first communications interface is part of a group of communications interfaces to the customer network element to provide failover support. The node further includes a network interface to communicate over a trunk group to other nodes, where the trunk group includes a primary trunk and a secondary trunk. Just one of the primary and secondary trunks is active for communicating data units. | 10-31-2013 |
20130308440 | REDUNDANT ARCHITECTURE FOR FAILOVER OF TRANSCODER INSTANCES - In one embodiment, a system includes a first subsystem that includes components configured to route video to transcoder instances for transcoding. The first subsystem includes a first host CPU configured to coordinate routing of first IP packets including video through a first routing system to the transcoder instances. The system also includes a second subsystem that includes components configured to route video to transcoder instances for transcoding. The second subsystem includes a second host CPU configured to coordinate routing of second IP packets including video through a second routing system to the transcoder instances. A redundancy connection connects the first subsystem and the second subsystem together to allow routing of the first IP packets or the second IP packets from the one of first subsystem and the second subsystem through the other of the first subsystem and the second subsystem. | 11-21-2013 |
20130322233 | Increasing Failure Coverage of MOFRR With Dataplane Notifications - An enhanced fast re-route mechanism provides increased failure coverage to a multicast communication network. If a network node detects a failure and determines that it cannot re-route multicast data, the network node sends a downstream fast notification packet (DFNP) in the network. The DFNP causes a downstream merge node to switch reception of the multicast data to its secondary path. The network node then receives an upstream fast notification packet (UFNP) from the merge node. The network node modifies its forwarding information upon receipt of the UFNP such that the multicast data is to be received by the network node from its downstream via which the UFNP was received. The DFNP and the UFNP cause the multicast data to reverse its flow direction between the network node and the merge node. | 12-05-2013 |
20130329546 | MLDP FAILOVER USING FAST NOTIFICATION PACKETS - An mLDP failover using fast notification packets. In one embodiment of a process for mLDP failover using fast notification packets, a first network node detects a failure of a second network node or a communication link coupled to the second network node. In response to detecting the failure, the first network node sends a packet to a third network node, wherein the packet comprises a notification of link or node failure and information identifying a multipoint label switched path (MLSP) that is configured to transmit multicast data packets of a multicast data stream. | 12-12-2013 |
20130336107 | DYNAMICALLY TRIGGERED TRAFFIC ENGINEERING ROUTING ADVERTISEMENTS IN STATEFUL PATH COMPUTATION ELEMENT ENVIRONMENTS - In one embodiment, a device (e.g., a path computation element, PCE) monitors a tunnel set-up failure rate within a computer network, and determines whether to adjust an accuracy of routing information based on the tunnel set-up failure rate. For instance, the tunnel set-up failure rate being above a first threshold indicates a need for greater accuracy. In response to the tunnel set-up failure rate being above the first threshold, the device may then instruct one or more routers to shorten their routing update interval in the computer network. | 12-19-2013 |
20130343174 | SERVICE PLANE TRIGGERED FAST REROUTE PROTECTION - Techniques are described for detecting failure or degradation of a service enabling technology function independent from an operational state of a service node hosting the service enabling technology function. For example, a service node may provide one or more service enabling technology functions, and service engineered paths may be traffic-engineered through a network to service node network devices that host a service enabling technology function. A monitor component at the service layer of the service node can detect failure or degradation of one or more service enabling technology functions provided by the service node. The monitor component reports detection of failure or degradation to a fault detection network protocol in a forwarding plane of the service node. The fault detection network protocol communicates with an ingress router of a service engineered path to trigger fast reroute by the ingress of traffic flows to bypass the affected service enabling technology function. | 12-26-2013 |
20140003227 | SELECTIVE BGP GRACEFUL RESTART IN REDUNDANT ROUTER DEPLOYMENTS | 01-02-2014 |
20140029410 | SOURCE DISCOVERY FOR NON-FLOODING MULTICAST USING OPENFLOW - Provided is a method of source discovery for non-flooding multicast using OpenFlow. A data packet is received from a source address on a network device. The data packet is routed from the network device to an OpenFlow controller. The OpenFlow controller identifies a rendezvous point (RP) of the network device, maps a random address to the source address in a port used for connecting with the rendezvous point (RP), generates a flow message containing a rule for handling the data packet, transmits the flow message to the network device and adds a flow entry in the network device based on the rule for handling the data packet. | 01-30-2014 |
20140078886 | AVOIDING DATA TRAFFIC LOSS IN AN ETHERNET RING MULTIHOMED, IN AN ACTIVE-STANDBY MANNER, TO A VIRTUAL PRIVATE LAN SERVICE TRANSPORT NETWORK - Data traffic loss in a an Ethernet Ring that is multihomed, in an active-standby manner, to a VPLS transport network (such as a Border Gateway Protocol (BGP) multihomed Ethernet Ring, an MC-LAG multihomed Ethernet Ring, or some other type of active-standby multihomed Ethernet Ring, etc.) (ring) is avoided. The exemplary multihomed ring running Ethernet Ring Protection (ERP) protocol includes a Ring Protection Link (RPL), a first node and a second node linked with a designated border router and a standby border router of the network, respectively. The data traffic loss in the multihomed ring is avoided by (i) receiving an indication that the link between the first node and the designated border router has failed; and (ii) invoking, responsive to the received indication, an ERP Media Access Control (MAC)-flush in the ring, even in the absence of a failed link in the ring and without activating the specified RPL. The ERP MAC-flush causes subsequent data packets from each of the plurality of nodes in the ring to be forwarded to the standby border router via the second node. | 03-20-2014 |
20140086041 | SYSTEM AND METHOD FOR PROVIDING N-WAY LINK-STATE ROUTING REDUNDANCY WITHOUT PEER LINKS IN A NETWORK ENVIRONMENT - A method is provided in one example and includes broadcasting a switching node identifier associated with a first link-state protocol enabled switching node to a plurality of link-state protocol enabled switching nodes. The plurality of link-state protocol enabled switching nodes are in communication with one another by a link-state protocol cloud. The method further includes broadcasting a priority associated with the first link-state protocol enabled switching node to the plurality of link-state protocol enabled switching nodes. The method further includes broadcasting connectivity information of the first link-state protocol enabled switching node to the plurality of link-state protocol enabled switching nodes using the link-state protocol cloud. The connectivity information includes connectivity of the first link-state protocol enabled switching node with at least one spanning tree protocol enabled switching node. | 03-27-2014 |
20140119172 | Apparatus and Method to Find Partially Disjoint Routes for Dual Fiber-Cuts - A method for protecting a bi-connected network against a dual link failure, the method comprising finding a plurality of cut-pairs for a data flow, finding a work path and a primary backup path for the data flow, determining the cut-pairs that overlap both the work path and the primary backup path, merging the cut-pairs that overlap the work path and the primary backup path into a plurality of cut-groups, wherein each cut-group comprises a first half and a second half, and constructing a plurality of partially disjoint backup paths based on the cut-groups, wherein one of the partially disjoint backup paths protects against the dual link failure that causes a failure on the second half of a first cut-group and a failure on the first half of a second cut-group. | 05-01-2014 |
20140126348 | IP PACKET TRANSMISSION USING VEHICULAR TRANSPORT - In one embodiment, a first stationary router may detect a disconnected backhaul link to a destination. In response to detecting the disconnected backhaul link, the first stationary router may send a message to a first traveling mobile device, to cause the message to be sent toward the destination via a second stationary router. The second stationary router may receive the message from the first traveling mobile device, and in response to forwarding the message to the destination over its connected backhaul link, may send an acknowledgment toward the first stationary router via a second traveling mobile device. The first stationary router may then, in response to receiving the acknowledgment, cease sending copies of the message to other traveling mobile devices. | 05-08-2014 |
20140126349 | REROUTING T1 SIGNAL OVER A WIDE AREA NETWORK - The instant application describes a method and an apparatus for restoring T1 service in the event of a copper cable failure. The apparatus includes an interface configured to receive a T1 signal from a first customer device experiencing the copper cable failure; a converter configured to receive the T1 signal from the interface and place the T1 signal inside an IP packet routable over a wide area network; and a router configured to receive the IP packet from converter and send the IP packet over the wide area network to a central hub for conversion back into the T1 signal and delivery to a second customer device. The method requires equipment on one side of the T1 (e.g., at the location of the failure), and does not need knowledge of the customer's network addressing scheme. Solution is completely layer 2 and needs no input from the customer to re-establish service. | 05-08-2014 |
20140140200 | METHOD AND SYSTEMS FOR AN OUTGOING UNIDIRECTIONAL OUTAGE BYPASS FOR A VOICE OVER INTERNET PROTOCOL PRIVATE BRANCH EXCHANGE SYSTEM - A system and method is disclosed herein for providing a unidirectional outage bypass for outgoing communications from a session initiation protocol (SIP) device in a hosted Voice-over Internet Protocol (VoIP) private branch exchange (PBX) system. An outage monitoring system is in communication with both a bypass configuration system and one or more bypass enablers that act at the direction of the bypass configuration system. The outage monitoring system detects outages and overloads, as well as, network failures between network components, the VoIP PBX, Client Devices and the public switched telephone network (PSTN). The bypass configuration system, in response to a detection of an outage, determines error-handling procedures for the unidirectional outage bypass system based on bypass configuration data. The bypass enablers forward outgoing communications between a client device and the PSTN, in accordance the error-handling procedures, by bypassing components that are currently experiencing failures or overloads. | 05-22-2014 |
20140146659 | RENDEZVOUS POINT CONVERGENCE METHOD AND APPARATUS - The present invention discloses a rendezvous point convergence method and apparatus and relates to the field of communications, to solve a problem that an entire network cannot work normally for a long time because a network device cannot send a candidate RP advertisement message to a bootstrap router BSR when the network device served as a rendezvous point RP is entirely faulty. In the present invention, when a route of an original working RP is unreachable, a first node receives a bootstrap message sent by a BSR, where Holdtime of the original working RP carried in the bootstrap message is 0; and the first node disables the original working RP and enables a candidate RP as a new working RP according to the bootstrap message. The present invention is applicable to the field of communications to implement rendezvous point convergence. | 05-29-2014 |
20140146660 | RESTARTING A LINE CARD - A method and a network device for preventing service disruption during a restart of a line card. The line card including a CPU control system and a forwarding system. Information on the CPU control system is stored in a predetermined storage and a flag is set prior to the restart of the line card. The stored information includes configuration information of the forwarding system and protocol state information of the CPU control system. The CPU control system is restarted while the forwarding system is maintained in a state of providing forwarding service. Upon detecting the flag is set during the restart of the CPU control system, the stored information is restored on the CPU control system. | 05-29-2014 |
20140160918 | IDENTIFYING A LABEL-SWITCHED PATH (LSP) ASSOCIATED WITH A MULTI PROTOCOL LABEL SWITCHING (MPLS) SERVICE AND DIAGNOSING A LSP RELATED FAULT - Provided is a method of identifying a Label-switched Path (LSP) associated with a Multi Protocol Label Switching (MPLS) service in a network. An MPLS service is identified in a network and logical neighbors of the MPLS service are determined. For each logical neighbor of the MPLS service, an LSP label is identified. Based on the LSP label, a unique out segment of the LSP associated with the Multi Protocol Label Switching (MPLS) service is identified. | 06-12-2014 |
20140169153 | MINIMIZING THE NUMBER OF NOT-VIA ADDRESSES - In an embodiment, a method comprises determining a set of protected components that are associated with a notifying node; determining a single network repair address for the set of protected components, wherein the single network repair address is for use in response to unavailability of any of the protected components when transmitting network traffic to the notifying node; assigning the single network repair address to each of the protected components; wherein the notifying node is an internetworking device and wherein the method is performed by one or more processors. | 06-19-2014 |
20140177432 | PROTECTION SWITCHING METHOD AND SYSTEM PROVISION BY A DISTRIBUTED PROTECTION GROUP - The present invention relates to a protection switching for use in a communication network, and more particularly, to a method and a system for protection switching provision by a distributed or extended protection group in a communication network. In one embodiment, this can be accomplished by defining a traffic bit (t-bit) on all the communication devices in the network, assigning at least one communication device as master node and other devices as slave node, determining a fault if continuity check message is not received in a predetermined time period between the master node and the traffic source, carrying of status information, reliably, between communication devices using existing protection or restoration methods, broadcasting by setting the bit ‘t’=1 (or ‘t’=0) by the master node to all other slave nodes thereby notifying about the fault (or clearance of fault) towards traffic source and receiving the traffic from the traffic source by the other available slave nodes when master node's link towards traffic source fails. | 06-26-2014 |
20140177433 | RESILIENT ATTACHMENT TO PROVIDER LINK STATE BRIDGING (PLSB) NETWORKS - A system for interfacing a client system in a first network domain with a Provider Link State Bridging (PLSB) domain includes at least two Backbone Edge Bridges (BEBs) of the PLSB domain. Each BEB is an end-point of a connection in the first network domain to the client system and an end-point of at least a unicast path in the PLSB domain. An inter-node trunk is provided in the PLSB domain for interconnecting the BEBs. A phantom node is defined in the PLSB domain and is notionally located on the inter-node trunk. Each of the BEBs is configured such that: an ingress packet received from the client system via the connection in the first network domain is forwarded through a path notionally rooted at the phantom node; and an egress packet destined for the client system is forwarded to the client system through the connection in the first network domain. | 06-26-2014 |
20140198631 | MANAGING A SWITCH FABRIC - In a method for managing a switch fabric comprising a plurality of fabric chips, each of said plurality of fabric chips comprising a plurality of port interfaces, a first configuration set and a second configuration set, each comprising a plurality of configuration registers for the port interfaces to use in calculating a port resolution for an incoming packet, are generated. In addition, a determination as to which of the first configuration set and the second configuration set the plurality of fabric chips are to use is made an instruction is communicated to each of the fabric chips to use the determined one of the first configuration set and the second configuration set. | 07-17-2014 |
20140204728 | NODE EQUIPMENT AND METHOD FOR COMMUNICATION - A node equipment includes a receiver, a processor, a memory and a transmitter. The node equipment is relayed by a plurality of relay devices with a server. The receiver receives a frame from adjacent node equipment. The processor generates a wait number by incrementing a number of hops for each of the relay devices, when the number of hops to the adjacent node equipment is reported with a synchronization request, the number of hops being generated by designating each of the plurality of relay devices as a starting point. The memory stores the wait number in association with an identifier of the relay device. The transmitter transmits a data frame in which the server is designated as an address. The processor outputs to the transmitter a data frame in which a relay device having a relatively small wait number stored in the memory is designated as a relay destination. | 07-24-2014 |
20140204729 | METHOD AND DEVICE FOR LACP LINK SWITCHING AND DATA TRANSMISSION - Embodiments of the present invention provide a method and a device for link aggregation control protocol (LACP) link switch. The method includes: monitoring state changes of interfaces in an LACP link aggregation group; when monitoring a state change occurs on an active interface in the aggregation group, determining whether the number of active interfaces in the aggregation group is smaller than a preset minimum active link number, if yes, keeping states of N interfaces among the interfaces on which a state change occurs being an active state, so that the number of active interfaces in the aggregation group is greater than or equal to the preset minimum active link number; and when monitoring a state change occurs on an inactive interface in the aggregation group, adjusting states of M interfaces among the N interfaces kept in the active state into an inactive state M being smaller than or equal to N. | 07-24-2014 |
20140233369 | ETHERNET VIRTUAL PRIVATE NETWORK SYSTEM FOR PROVIDING FAST PROTECTION FOR ACCESS RINGS - In one embodiment, a method includes obtaining a first indication from a first source included in an Ethernet ring and obtaining a second indication from a second source associated with a provider edge (PE) node The method also includes determining when the first indication and the second indication are indicative of a direct failure of the PE node and determining when the first indication and the second indication are indicative of a ring partition failure associated with the Ethernet ring. The direct failure of the PE node is identified when it is determined that the first indication and the second indication are indicative of the direct failure of the PE node, and the ring partition failure associated with the Ethernet ring is identified when it is determined that the first indication and the second indication are indicative of the ring partition failure associated with the Ethernet ring. | 08-21-2014 |
20140254347 | Ethernet Ring Protection Switching Method, Node, and System - Embodiments of the present invention disclose an Ethernet ring protection switching method, node, and system. In an Ethernet ring protection switching method is disclosed, it is determined whether the current link is a lower-bandwidth link according to bandwidth information of a current link and bandwidth information of another link on a ring. If the current link is a lower-bandwidth link, a port corresponding to the current link is blocked. | 09-11-2014 |
20140269254 | VIRTUAL ROUTER UPGRADE VIA GRACEFUL RESTART - Embodiments herein generally provide techniques for upgrading a virtual router (VR) comprising first and second physical routers used to route data between network devices. Before upgrade the first physical router, one or more ports of the router are disabled which causes data paths previously flowing through the first router to flow through the second router. After performing the upgrade, the first router is rebooted and uses a unique router ID to discover the network topology of an external network coupled to the VR. Once the network topology is identified, the first router activates a routing application (e.g., a BGP routing application) which enables the router to process control plane traffic received from the second router. Once routing information is gathered, the first router is able to assume the responsibility of forwarding data packets in the network, thereby freeing the second router to be upgraded. | 09-18-2014 |
20140286154 | HYBRID DISTRIBUTED LINEAR PROTECTION - A method for linear protection for a network element communicatively coupled to another network element included in a node portal located at the edge of an administrative network domain includes exchanging linear automatic protection switching (“APS”) messages with clients in the administrative network domain over one or more path pairs. The path pairs include a working path communicatively coupling a client and the network element and a protect path communicatively coupling a client and the other network element. The method also includes translating the linear APS messages into a shared mesh protection message and exchanging the shared mesh protection message between the network element and the other network element over an intraportal link. The shared mesh protection messages include information concerning a plurality of working paths. | 09-25-2014 |
20140301181 | DETECTING, REPORTING, AND RECOVERING FROM POTENTIAL SERVICE DISRUPTIONS - A user equipment (UE) detects a change in one or more criteria, determines whether a severity of the potential loss of network service is above a severity threshold, transmits a ping to a server to which the UE was connected before detecting the potential loss of network service based on the severity of the potential loss of network service being above the severity threshold, and blocks transmission of a ping to the server based on the severity of the potential loss of network service not being above the severity threshold. A server attempts unsuccessfully to connect received call requests to the UE, transmits one or more pings to the UE, and changes a presence status of the UE to indicate that the UE is likely not reachable based on not receiving a response to the one or more pings from the UE before transmitting a threshold number of pings. | 10-09-2014 |
20140301182 | GRACEFUL RESTART (GR) METHODS AND DEVICES - This disclosure provides methods and devices for Graceful Restart (GR) in a network with multiple GR Restarters that include a first GR Restarter and at least one second GR Restarter corresponding to the first GR Restarter. After receiving routes from all normal neighbor network devices of the first GR Restarter, the first GR Restarter performs route selection to determine first selected routes, and sends the first selected routes to the at least one second GR Restarter. After receiving routes from the at least one second GR Restarter, the first GR Restarter performs route selection to determine second selected routes, updating a local Forwarding Information Base (FIB) at the first GR Restarter with the second selected routes, and sends the second selected routes to all neighbor network devices of the first GR Restarter. The first GR Restarter directly connects with the at least one second GR Restarter corresponding to the first GR Restarter. | 10-09-2014 |
20140307538 | Apparatus and Method for a Communication Network | 10-16-2014 |
20140307539 | Method, Device, and System for Dual-Uplink Tangent Ring Convergence - A method, device, and system for dual-uplink tangent ring convergence, where ports on a network device are classified into conjugate ports and non-conjugate ports. When receiving an entry update packet from a first port or perceiving a state change of a first port, when it is determined that the first port of the network device is a conjugate port, the network device clears a media access control (MAC) entry and an Address Resolution Protocol (ARP) entry that use the first port as an outbound interface and clears all MAC entries that use a non-conjugate port as an outbound interface, in a MAC table and an ARP table of the network device. In this way, traffic interruption can be avoided, wherein a failure of one dual-uplink tangent ring does not cause an entry of one or more other normal dual-uplink tangent rings to be cleared/updated. | 10-16-2014 |
20140313880 | FAST FLOODING BASED FAST CONVERGENCE TO RECOVER FROM NETWORK FAILURES - A method in a router for initiating fast flooding based fast convergence to recover from a network failure is disclosed. The method also starts with detecting a network failure. Responsive to the detected network failure, the router floods a layer 2 fast failure notification message out a set of one or more interfaces of the router. The fast failure notification message includes information that identifies the network failure and indicates to a router that receives the fast failure notification message to flood the fast failure notification message out its interfaces that are not blocked by a spanning tree protocol (STP) independently of updating its routing table to reflect the network failure. The method continues with the router updating a routing table to reflect the network failure. | 10-23-2014 |
20140321264 | Network Relay Device - When a first line card receives a frame at a port, the line card refers to monitoring results by internal communicability monitoring units of other second to fourth line cards and a monitoring result by an internal communicability monitoring unit of its own, determines a first band limiting unit of a transmission destination from band limiting units of other line cards based on the monitoring results, and transmits the frame. The second line card limits the communication band of the frame by the first band limiting unit of its own, and transmits the frame to a predetermined port. If any fault is detected in the communicability in the internal communicability monitoring table to/from the second line card as the communication counterpart, and, if the communicability to/from the third line card as the communication counterpart is normal, the first line card changes the transmission destination into the second band limiting unit. | 10-30-2014 |
20140328158 | PROTECTION GROUP SWITCHING FOR CIRCUIT EMULATION - A secondary edge node is coupled between the packet network and a non-packet network and is adapted to function as follows when a failure associated with the primary edge node or circuitry coupled thereto occurs. First, the secondary edge node may detect a failure associated with the primary edge node, which is associated with a primary media access control (MAC) address that is used to direct the packet traffic from the first edge node to the primary edge node. Upon detecting the failure, the secondary edge node may send a switch request message including a secondary media access control address that is associated with the secondary edge node to the first edge node. Sending the switch request message indicates that the first edge node should start sending traffic for the first session to the secondary edge node using the secondary media access control address. | 11-06-2014 |
20140328159 | Recovery of Split Architecture Control Plane - A method of operating a control plane having a centralised network management system ( | 11-06-2014 |
20140328160 | METHODS AND APPARATUS FOR NETWORK PROTECTION - The present disclosure relates to a network protection scheme. In one embodiment, there provides a method for network protection, including the steps of: detecting a switch indicator in a network; setting a rate limit of storm protection, which is of a first value, as a second value, the second value being higher than the first value; and performing a flush operation of a Forwarding DataBase FDB. | 11-06-2014 |
20140347975 | DATA TRANSMITTING DEVICE, DATA TRANSMITTING METHOD AND NON-TRANSITORY COMPUTER-READABLE STORAGE MEDIUM - A data transmitting device coupling to a plurality of nodes in a network includes a plurality of communication paths, the data transmitting device includes a memory and a processor coupled to the memory configured to set a routing table based on a command that designates a first communication path included in the plurality of communication paths, to detect a link failure occurred in the network, and when the link failure has occurred at a first location between the data transmitting device and a first node adjacent to the data transmitting device on the first communication path, to modify the routing table so that data are to be transmitted to a second node on a second communication path different from the first communication path, and when the link failure has occurred at a second location that differs from the first location in the network, to maintain the routing table. | 11-27-2014 |
20140355414 | Label Switched Path Network Failure Detection And Traffic Control - A method for providing ingress fault protection in a label switched network, comprising sending data traffic from a source node to a first label switched path (LSP) via a first ingress node, detecting a first fault using a first fault detection link between the source node and the first ingress node, sending the data traffic from the source node to a second LSP via a second ingress node in response to detecting the first fault, detecting a second fault using a second fault detection link between the first ingress node and the second ingress node, and merging the data traffic from the second LSP into the first LSP at a next-hop node of the first ingress node, wherein the data traffic is no longer sent to the first LSP via the first ingress node after the first fault. | 12-04-2014 |
20140355415 | 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. | 12-04-2014 |
20140369181 | TRANSMISSION SYSTEM, ROUTING CONTROL DEVICE AND METHOD FOR CONTROLLING ROUTING - A first terminal-side routing control device | 12-18-2014 |
20140369182 | SYSTEM AND METHOD FOR SELECTIVE PROTECTION SWITCHING - For transmitting packets over radio communication links wherein flows of packets are delivered containing protected packets and unprotected packets, the status of propagation of the packets is verified in order to detect the presence of a faulty condition. If no faulty condition is detected, protected packet are transmitted over a first radio link wherein the transmission occupies a first portion of available bandwidth on the first radio link, and unprotected packets are transmitted on at least part of the remainder of the available bandwidth of the first radio link and at least part of available bandwidth the second radio link. If a faulty condition is detected, a protected packet is transmitted over the first radio link wherein the transmission occupies a first portion of available bandwidth on the first radio link, a duplicate of the protected packet is transmitted over the second radio link wherein said transmission occupies a second portion of available bandwidth on the second radio link, and unprotected packets are transmitted on at least part of the remainder of the available bandwidth of the first radio link and at least part of the remainder of the available bandwidth of the second radio link. | 12-18-2014 |
20140376360 | METHOD AND APPARATUS FOR SUPPORTING A COMMUNICATION SERVICE - A wireless communication network and a mobile device may support Circuit Switched (CS) and Packet Switched (PS) services. Some types of communication services (e.g. voice, text, data, etc.) may be supported using a CS service or using a PS service. In some embodiments, the PS service is an IMS service using Session Initiation Protocol (SIP) to provide a “CS-like” communication service such as voice or text message. According to the disclosure, a mobile device may detect that it is process data for the PS service. For example, a SIP component that supports the PS service may become inoperable. In response, the mobile device attempts to support the communication service using the CS service. | 12-25-2014 |
20150009800 | UNIFIED REPLICATION MECHANISM FOR FAULT-TOLERANCE OF STATE - A network control system that achieves high availability for forwarding state computation within a controller cluster by replicating different levels of table state between controllers of the controller cluster. To build a highly available controller cluster, the tables for storing the forwarding state are replicated across the controllers. In order to take responsibility for a slice, the slave controller of some embodiments performs merging of replicated state on a slice-by-slice basis. The merging is performed in a manner to prevent disruptions to the network state while the slave controller is updated. | 01-08-2015 |
20150009801 | PROCESSING STATE INFORMATION - A method of processing state information relating to user equipment in a communications system comprising a radio access network, the method comprising: maintaining current state information relating to the user equipment; and on the basis of a change of connection of the user equipment from a first cell to a second cell: transmitting a current value associated with a given state information part to the target radio access node in response to detecting at least one of one or more predetermined triggers that indicate that the target radio access node may not have received the current value from the source radio access node; or relying on the target radio access node having received the current value from the source radio access node if said at least one of said one or more predetermined triggers is not detected. | 01-08-2015 |
20150009802 | Method and Arrangement for Connection Re-establishment in a Telecommunication System - The invention relates to a method in a user equipment and a user equipment ( | 01-08-2015 |
20150016242 | Method and Apparatus for Optimized LFA Computations by Pruning Neighbor Shortest Path Trees - A method is implemented by a network element for determining a next hop of a backup path for a fast reroute process to be utilized in response to a network event invalidating a primary path to a destination node. The method reduces computational requirements of the network element by reducing a number of paths to be evaluated without affecting selection of the backup path. The method selects a neighbor node P of a source node S to calculate a shortest path tree (SPT) for P for use in identifying backup paths for S. The SPT is calculated for P, pruning paths from the SPT that traverse S or that fail an LFA condition. P is selected for the next hop of the backup path for a destination node X where the SPT of P provides an LFA path from S to the destination node X. | 01-15-2015 |
20150023151 | AUTOMATED NETWORK FAULT LOCATION - A method, system, and computer program product for locating a network fault are provided in the illustrative embodiments. A set of network probes is configured to execute at a corresponding set of networking components in a data network. A set of events is received. An event in the set of events includes a list of network probes in an order those network probes are visited, the list of network probes forming a path in a set of paths. A test is performed to determine whether a fault condition is present in any of the paths. Those paths are selected, as a set of candidate paths, where the fault condition is present. At least one segment of a specified length is located that is common to a threshold number of paths in the set of candidate paths. The located segment is suggested as the location of the network fault. | 01-22-2015 |
20150036479 | AUTOMATIC STACK UNIT REPLACEMENT SYSTEM - Systems and methods for replacing a stack unit in a stack system include determining that a first and a second port that are located on opposite ends of the stack system are inactive when operating in a stack port mode after being connected to respective ports on a new stack unit that are operating in a Ethernet port mode. In response, the first and second port are converted from the stack port mode to the Ethernet port mode. A stack port probe packet is then sent from the first and second port to the new stack unit that cause the new stack unit to convert its connected ports from the Ethernet port mode to the stack port mode. A stack port probe reply is then received through the first and second port from the new stack unit and, in response, the first and second port are converted from the Ethernet port mode to the stack port mode. | 02-05-2015 |
20150043326 | 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. | 02-12-2015 |
20150043327 | METHOD AND APPARATUS FOR HITLESS FAILOVER IN NETWORKING SYSTEMS USING SINGLE DATABASE - A device includes a master control card that performs control plane processing, a backup control card, where the backup control card takes over control plane processing if the master control card goes out of service, and a database card that connects to the master control card and the backup control card, where the database control card stores information relating to control plane processing. A method of achieving hitless failover in a network element includes detecting that a master control card of the network element has gone out of service, designating the backup control card as a new master control card of the network element, establishing communication with a database card of the network element, and retrieving protocol states information from the database card. | 02-12-2015 |
20150043328 | 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. | 02-12-2015 |
20150055451 | Network Switching Systems And Methods - Systems and methods are disclosed for effectuating control-plane changes at increased speeds to protect a network in which switching operations are performed. Operations to effectuate control-plane changes in the network can be divided between software and more-rapid, dedicated hardware within a line card. Examples of operations reserved to hardware implementation can include blocking and unblocking of ports, flushing of learned entries from switch tables, and coordination of control-plane changes through the generation of messages sent between nodes, and also between line cards of a node. Determinations about the need for hardware-driven, control-plane changes may be made based on events occurring in the network in accordance with any of a number of different network protection protocols. The protocol may be implemented in a state machine and the software may determine the state of the hardware through a master/slave relationship. | 02-26-2015 |
20150055452 | DEDICATED CONTROL PATH ARCHITECTURE FOR SYSTEMS OF DEVICES - A dedicated control path architecture for systems of devices, such as stacking systems, is provided. In one embodiment, a network device for use in a system of devices can comprise a CPU complex; a first set of ports for establishing a data path between the network device and other network devices in the system of devices; and a second set of ports for establishing a control path between the network device and the other network devices in the system of devices. The control path can be separate from the data path and can allow the CPU complex to exchange control plane traffic with other CPU complexes resident in the other network devices. | 02-26-2015 |
20150063094 | METHOD, APPARATUS, AND SYSTEM FOR DETECTING CONNECTIVITY - The present invention discloses a method, an apparatus, and a system for detecting connectivity. A node receives connectivity detection request information; determines, according to nicknames of target nodes, whether the is one of the target nodes; if the node is one of the target nodes, sends connectivity detection reply information to a source node; if the node is not one of the target nodes, performs corresponding processing according to a value of a hop count and whether the node is on a path that is in the multicast distribution tree and is from the source node to any one of the target nodes. With the present invention, a source node is capable of receiving only a feedback of a node on a true path, thereby making it easier to identify a path. | 03-05-2015 |
20150071056 | SIGNAL PROCESSING METHOD IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR - A method is described for operating a device in a wireless communication system. The device communicates with a base station using a subframe for the device only; detects, by the device, a problem with a connection between the device and the base station. The device starts a timer upon detecting the problem with the connection between the device and the base station. The device releases a restriction of using the subframe for the device only, if the timer expires. The problem with the connection between the device and the base station is associated with a radio link failure. The detection of a problem with the connection between the device and the base station comprises detecting consecutive out-of-sync indications. | 03-12-2015 |
20150085639 | Protecting a Label Switched Path Egress Without Using Downstream Labels - A computer program product comprising computer executable instructions stored on a non-transitory computer readable medium such that when executed by a processor cause a network element to protect a label switched network against egress node failure by receiving a primary service label and a backup service label from an upstream node in the network, receiving data traffic comprising the primary service label from the upstream node for transmitting to a downstream node in the network, determining a status of a primary egress node in the network, the primary egress node being associated with a primary label switching path, forwarding the data traffic according to a primary label switching path when the primary egress node is operating properly, and replacing the primary service label with the backup service label and forwarding the data traffic according to a backup label switching path when the primary egress node has failed. | 03-26-2015 |
20150092535 | Methods For Limiting Number Of Routers In A Mesh Network - In some cases, it may be desirable to limit the number of routers in a mesh network. Various techniques to limit the number of routers, without affecting connectivity, are disclosed. In some embodiments, a node enables its router capability if there are less than a predetermined number of routers already in the network. In other embodiments, a node enables its routing capability only is it is necessary to resolve a connectivity issue or a biconnectivity issue. In some cases, a node, which previously enabled its router capability, may no longer be required to be a router. In some embodiments, this node, upon making this determination, disables its routing capability. | 04-02-2015 |
20150092536 | METHOD AND APPARATUS FOR MANAGING THE INTERCONNECTION BETWEEN NETWORK DOMAINS - A control protocol is run in the interconnect region between network domains so that the interconnect region may be managed using a separate control plane. According to an embodiment of the invention, a spanning tree protocol is used to establish a separate spanning tree within the interconnect region. To avoid loop formation within the interconnect region, links interconnecting adjacent edge nodes that are part of the interconnect region and which belong to a given domain are allowed to pass control frames but not data frames. OAM may be used detect link failure of a link between adjacent nodes on a given domain. | 04-02-2015 |
20150098316 | METHOD AND APPARATUS FOR MITIGATING NETWORK FAILURES - An aspect of the subject disclosure may include, for example, receiving a communication request responsive to a telephone number mapping query failure, where the communication request is initiated by an originating communication device requesting a communication session with a terminating communication device, foregoing initiating the communication session as a circuit-switched communication session responsive to determining that the originating communication device and the terminating communication device are enabled to use packet-switched communications, and instructing a second network node to initiate the communication session as a packet-switched communication session between the originating communication device and the terminating communication device responsive to the determination. Other embodiments are disclosed. | 04-09-2015 |
20150098317 | LINEAR PROTECTION SWITCHING METHOD AND APPARATUS FOR PROTECTING NETWORK SEGMENTED INTO MULTI-DOMAIN - Provided is a protection end node located at an end of a protection path, wherein the protection end node includes a receiver to receive, from a working end node located at an end of a working path, path defect information indicating whether a defect occurs on the working path, a processor to perform protection switching in response to reception of the path defect information and generate path control information used for the working end node to control a connection of the working path based on the protection switching, and a transmitter to transmit the path control information to the working end node. | 04-09-2015 |
20150103642 | DIAGNOSING CONNECTIVITY IN A NETWORK - Diagnosing connectivity in a network includes obtaining information from a network wherein the network is a hybrid network including software-defined networking (SDN) network components and other network components, querying a SDN controller for network metrics of the network, and diagnosing a connectivity issue in the network based on the information from the network and the network metrics. | 04-16-2015 |
20150103643 | TRANSMISSION NETWORK AND TRANSMISSION NETWORK MANAGEMENT SYSTEM - A transmission network is comprised of a network management system for collectively managing and controlling a plurality of transmission devices coupled mutually through transmission routes and the transmission network as well. The network management system includes a plane management table adapted to manage transmission planes defined as a set of paths in the transmission network, and the plane management table has the function to set and manage a transmission plane (working plane) applied during normal operation and besides, a single or a plurality of transmission planes (protection planes) applicable in the event of occurrence of a fault in the transmission network. Then, when a fault occurs in the transmission network, the network management system changes the applied plane to a suitable transmission plane. | 04-16-2015 |
20150109899 | PIM FAST FAILOVER USING PIM GRAFT MESSAGE - A system for PIM fast failover recovery includes a network of a plurality of switching devices. The plurality of switching devices includes a source switching device near a source communicatively connected to a receiver switching device near a receiver by a first interface and at least a third switching device that is communicatively connected to the receiver switching device by a second interface and further is communicatively connected to the source switching device by a third interface. The receiver switching device may discover that the first interface has failed and responds by sending the third switching device a PIM graft message prior to deleting an associated first interface route entry. | 04-23-2015 |
20150109900 | METHOD AND APPARATUS FOR LINEAR PROTECTION SWITCHING - Provided is a linear protection switching method of a node, wherein the method includes selecting a local request based on a priority of at least one local request, determining a global request based on a priority between the selected local request and a remote message, and performing a state transition based on the global request. | 04-23-2015 |
20150109901 | METHOD FOR MANAGING FORWARDING PLANE TUNNEL RESOURCE UNDER CONTROL AND FORWARDING DECOUPLED ARCHITECTURE - An embodiment of the present invention discloses a method and device for managing a forwarding plane tunnel resource, wherein the method includes: sending a forwarding plane tunnel resource request message to a forwarding plane device, for enabling the forwarding plane device to allocate a forwarding plane tunnel resource according to the forwarding plane tunnel resource request message; acquiring the allocated forwarding plane tunnel resource from the forwarding plane device; and sending the acquired forwarding plane tunnel resource to a target network element, to establish a packet data network connection with the target network element. By adopting the present invention, the load balancing of the forwarding plane device is achieved, the signaling interaction between the control plane device and the forwarding plane device is reduced as much as possible, and meanwhile, efficient failure processing can also be achieved in the case of a failure occurred in a device. | 04-23-2015 |
20150124584 | METHOD AND APPARATUS FOR IMPROVED HANDLING OF IMS NODE BLACKLISTING - Accordingly, there is provided an IMS node, comprising a transmission module and a processor. The transmission module is arranged to send SIP messages to a plurality of other IMS nodes. The processor arranged to detect an error in a particular other IMS node, the error indicating that the particular other IMS node is not available to receive traffic. In response to detection of such an error, the processor causes the particular other IMS node not to be used for a period of time. The transmission module is further arranged to send at least one test message to the particular other IMS node when the period of time expires. The processor is further arranged to determine if the at least one test message is successfully processed by the particular other IMS node, and in response to a positive determination then returning the particular other IMS node to use. | 05-07-2015 |
20150124585 | METHODS AND APPARATUS FOR RELOCATING AND RESTORING CONNECTIONS THROUGH A FAILED SERVING GATEWAY AND TRAFFIC OFFLOADING - In a radio telecommunications network, a serving gateway support node controls connections between user equipment nodes and a packet-based network that pass through at least one serving gateway and at least one packet gateway. The serving gateway support node detects failure of communications to a first serving gateway. The serving gateway support node responds to the detected failure by initiating relocation of existing connections through the first serving gateway to instead pass through a second serving gateway. The serving gateway support node detects recovery of communications to the first serving gateway, and responds by ceasing relocation of at least some of the existing connections that have not yet been relocated to the second serving gateway. Related methods, serving gateways, and packet gateways are also disclosed. | 05-07-2015 |
20150138946 | CONTROLLING SWITCH MECHANISM FOR DETECTING FIBRE CHANNEL OVER ETHERNET DATA FORWARDER FAILURE - Techniques are provided for detecting failure of switching elements of a distributed switch configured to forward Fibre Channel over Ethernet (FCoE) frames. Periodic discovery advertisement messages, which include a fabric name fieldm, are transmitted between a controlling Fibre Channel Forwarder (cFCF) and a FCoE data forwarder (FDF). The cFCF determines a FDF has failed out of the switch fabric based on a reserved value in the fabric name field of a received discovery advertisement message, such as a zero or null value, and de-instantiates virtual links with that FDF. | 05-21-2015 |
20150138947 | DETECTING FAILURES OF BACKUP LABEL SWITCHED PATHS IN A NETWORK ENVIRONMENT - A method is provided in one example and includes communicating a first request message to a first network element functioning as a point of local repair for a backup label switched path. The first request message includes a first network address having a predetermined value and an indication of a forwarding equivalence class associated with the backup label switched path. The method further includes receiving a first reply message from the first network element. The first reply message includes at least one backup path parameter associated with the backup label switched path. | 05-21-2015 |
20150146517 | Apparatus and Methods for Accessing a Data Network - A packet data network gateway, P-GW, is located in a second network for supporting control plane data in a wireless communications system that additionally comprises a first network having a first P-GW operably couplable to the P-GW, and a serving gateway, S-GW. The P-GW comprises a processor arranged to: monitor and build terminal device context information for a plurality of terminal devices being served with user plane data by the second network; and determine an operational status of at least one of: the backhaul link, first P-GW. In response to the processor determining that at least one of: the backhaul link, first P-GW, is unavailable, the processor is arranged to perform at least one of: terminate signalling between the first network and at least one of a mobility management entity, MME, the S-GW; defer signalling between the first network and at least one of the MME, the S-GW; perform at least some functionality of the first P-GW. | 05-28-2015 |
20150146518 | METHOD AND DEVICE FOR PROCESSING COMMUNICATION PATH - Embodiments of the present invention relate to a method and a device for processing a communication path. The method includes: obtaining a path processing parameter from local configuration information or from a control layer device, obtaining path information and/or a restarting counter parameter from the control layer device; increasing a path with an opposite-end device when the path information is of increasing a path, identifying the state of the path and/or the state of the opposite-end device using the path processing parameter and/or the restarting counter parameter the opposite-end device; reporting the fault state of the path and/or the reset state of the opposite-end device to the control layer device when the path fails and/or the opposite-end device is reset, releasing sessions on the failed path and/or on a path connected with the reset opposite-end device. | 05-28-2015 |
20150295861 | LINK PROBLEM HANDLING - In a computer network comprising a stack device and a plurality of network devices, the plurality of network devices are each connected to the stack device via a respective aggregation link comprising a plurality of member links and the stack device comprises a first stack member and a second stack member connected to the first stack member via a stack link. A correspondence is formed between a first route and the first stack member. The first route is used by the first stack member for forwarding traffic from a first network device to a second network device of the plurality, and comprises a member link via which the traffic is forwarded from the first stack member. Upon detecting a link problem in the member link of the first route, the first route is found, the first stack member is identified based on the correspondence, and traffic information is sent to cause the first network device to migrate at least a proportion of the traffic to have been forwarded via the first route to a route that does not include the link having a link problem. | 10-15-2015 |
20150312088 | SYSTEM AND METHOD FOR PRIMARY SWITCH ELECTION IN PEER GROUPS - A system and method for primary switch election in peer groups includes a switch. The switch includes a control unit, first ports coupling the switch to a peer switch via first network links forming an inter-chassis link (ICL), and second ports coupling the switch to a plurality of first switches using a plurality of second network links. The second network links are part of a plurality of virtual link trunking (VLT) link aggregation groups (LAGs) wherein each of the VLT LAGs is associated with a respective one of the first switches. The control unit is configured to exchange dynamic election criteria with the peer switch, determine whether the switch is a primary or a secondary switch based on the exchanged dynamic election criteria, determine whether the ICL is down, and shut down the second network links when the ICL is down and the switch is the secondary switch. | 10-29-2015 |
20150312140 | Method and System for Handling Failure in a Coordinated Multicast Streaming System - According to one embodiment of the invention, a non-transitory computer readable medium for handling the failure of a controller within a communications network is provided. One embodiment of the non-transitory computer readable medium comprises instructions that cause a secondary network device to identify one or more multicast streams received by a primary network device and detect that the primary network device has failed; and responsive to detecting that the primary network device has failed, cause the secondary network device to subscribe to the multicast streams. | 10-29-2015 |
20150319083 | METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR PROVIDING N-NODE MULTI-SWITCH LINK AGGREGATION GROUPS (MLAGs) - A system for providing at least one node of an n-node multi-switch link aggregation group (MLAG) includes a packet forwarding device for receiving a packet destined for at least one n-node MLAG, n being an integer greater than 2. The packet forwarding device includes a packet forwarding database for storing packet forwarding rules for the at least one n-node MLAG. The packet forwarding device further includes a processing element for forwarding, blocking forwarding of, or redirecting the packet in accordance with one of the packet forwarding rules defined for the n-node MLAG group in the packet forwarding database. | 11-05-2015 |
20150326426 | PARTIAL SOFTWARE DEFINED NETWORK SWITCH REPLACEMENT IN IP NETWORKS - The claimed subject matter is directed to novel methods and systems for a network topology wherein an IP network is partially integrated and enhanced with a relatively small number of SDN-OF enabled network devices to provide a resilient network that is able to quickly recover from a network failure and achieves post-recovery load balancing while minimizing cost and complexity. By combining SDN-OF enabled switches with traditional IP nodes such as routers, a novel network architecture and methods are described herein that allows for ultra-fast and load balancing-aware failure recovery of the data network. | 11-12-2015 |
20150350023 | DATA CENTER NETWORK ARCHITECTURE - Data center network architectures that can reduce the cost and complexity of data center networks. The data center network architectures can employ optical network topologies and optical nodes to efficiently allocate bandwidth within the data center networks, while reducing the physical interconnectivity requirements of the data center networks. The data center network architectures also allow computing resources within data center networks to be controlled and provisioned based at least in part on a combined network topology and application component topology, thereby enhancing overall application program performance. | 12-03-2015 |
20150365357 | MTU MANAGEMENT IN A VIRTUALIZED COMPUTER SYSTEM - A management module is implemented in a virtualization software of a virtualized computing device having one or more virtual machines and a virtual switch configured therein. The management module detects a mismatch between a maximum transmission unit (MTU) of the virtual switch and an MTU of a virtual network interface of a virtual machine. An error message may be immediately returned so that the MTU of the virtual network interface may be corrected in response thereto. Otherwise, an error flag indicating the MTU mismatch is set but the connection between the virtual switch and the virtual network interface is allowed to be established. The error flag may be used as a prompt to correct the MTU of the virtual network interface at a later time or to connect the virtual network interface to a different virtual switch. | 12-17-2015 |
20150372903 | SEAMLESS MULTIPATH RETRANSMISSION USING SOURCE-ROUTED TUNNELS - In one embodiment, a device receives a destination unreachable message originated by a particular node along a first source route, the message carrying an encapsulated packet as received by the particular node. In response, the device may determine a failed link along the first source route based on a tunnel header and the particular node. Once determining an alternate source route without the failed link, the device may re-encapsulate and re-transmit the original packet on an alternate source route with a new tunnel header indicating the alternate source route (e.g., and a new hop limit count for the tunnel header and an adjusted hop limit count in the original packet). | 12-24-2015 |
20150381406 | LOOP AVOIDANCE DURING NETWORK CONVERGENCE IN SWITCHED NETWORKS - Various techniques can be used to avoid loops during network convergence after a topology change such as a failure. For example, a method can involve detecting a failure that disrupts an existing forwarding path between a node and a destination node; calculating at least one updated forwarding path from the node to the destination node; identifying a maximum time for at least a portion of the network to reach a post-convergence state with respect to the failure; until the maximum time has elapsed at the node, explicitly specifying at least a portion of the updated forwarding path in packet headers of any packets being sent from the node to the destination node; and after the maximum time has elapsed at the node, non-explicitly specifying the portion of the updated forwarding path in packet headers of any additional packets being sent from the node to the destination node. | 12-31-2015 |
20160014015 | METHOD FOR CONFIGURING NODE DEVICES OF A MESH COMMUNICATIONS NETWORK, COMPUTER PROGRAM, INFORMATION STORAGE MEANS AND SYSTEM | 01-14-2016 |
20160020910 | CONTROLLERS WITH INTEGRATED POWER OVER ETHERNET NETWORK SWITCHES - A system and approach that may provide power to network switches of controllers in a failsafe manner. For instance, when a controller is receiving normal power, the controller may act as a power over Ethernet (POE) source that supplies power to its connected Ethernet devices as required. However, if power to a controller is lost, then Ethernet devices may switch to a powered device mode and use power from a neighboring device to keep active. Some power may be tapped for network switch operation from any network switch port receiving power from another device. This may allow communication to remain operational across multiple devices in a string of which some have lost a source of normal power. | 01-21-2016 |
20160050081 | CONTROL APPARATUS, COMMUNICATION SYSTEM, COMMUNICATION NODE CONTROL METHOD, AND PROGRAM - A control apparatus includes a representative port selection unit configured to select, for each of a plurality of domains formed by a plurality of communication nodes disposed on a network to be controlled, a representative port configured to transfer a broadcast packet with an adjacent one of the domains, a broadcast path calculation unit configured to calculate a forwarding path for the broadcast packet that passes through the representative port, for each of the domains, a control information generation unit configured to generate, for each communication node on the forwarding path, control information for causing the broadcast packet to be forwarded along the forwarding path, and a control information setting unit configured to set the generated control information in each communication node on the forwarding path. | 02-18-2016 |
20160050105 | MAINTENANCE OF DATA FORWARDER CONNECTION STATE INFORMATION - An example of high availability for FC or FCoE can include maintaining connection state information in a Fiber Channel over Ethernet (FCoE) Data Forwarder (FDF) or Fiber Channel Data Forwarder (FcDF). A failure of a first FCoE Forwarder (FCF) associated with the FDF can be detected. A second FCF can check a configuration file of the second FCF to see if the second FCF is responsible for the FDF. The second FCF can request the virtual domain ID, of the failed FCF, from a principal switch. The second FCF can be used as a service node for the FDF. | 02-18-2016 |
20160050119 | SYSTEMS AND METHODS FOR SETTING UP END-TO-END TRAFFIC ENGINEERED ETHERNET LINE SERVICES - A method, a switch, and a network includes receiving a request for an Ethernet service at a Maintenance End Point (MEP) in a network, wherein the Ethernet service has a destination of a Remote MEP (RMEP), and wherein the request includes bandwidth amounts for the request; utilizing Link Trace messaging to the RMEP to detect an active path to the RMEP; and utilizing Loop Back messaging to the RMEP to reserve bandwidth based on the bandwidth amounts on the active path. | 02-18-2016 |
20160065448 | FINANCIAL NETWORK - A network system that facilitates financial transactions. A software defined network may operate to provide a variety of trading related services to a variety of customers with a low latency. Core or processor affinity for routing processes may improve speeds of routing. Data capture through a shared memory space may allow for a variety of analytics without introducing unacceptable delay. | 03-03-2016 |
20160065450 | NETWORK CONNECTIVITY - Traffic is transferred between a first consumer network node and a second consumer network node via a local connection established at a first service provider network node. The first service provider network node is connected to the first consumer network node via a first attachment circuit, and to the second network consumer node via a second attachment circuit. A loss in connectivity is detected between the first consumer network node and the second consumer network node via the local connection, and in response, traffic is transferred between the first consumer network node and the second consumer network node via a remote connection. The remote connection includes a pseudowire established between the first service provider network node and a second service provider network node. The second consumer network node is connected to the second service provider network node via a third attachment circuit. | 03-03-2016 |
20160072640 | MAC COPY IN NODES DETECTING FAILURE IN A RING PROTECTION COMMUNICATION NETWORK - Embodiments of the present invention provide a method and system for reducing congestion on a communication network. The communication network includes a network node having a first port and a second port. The network node is associated with forwarding data including first port forwarding data identifying at least one node accessible via the first port, and second port forwarding data identifying at least one node accessible via the second port. A failure associated with one of the first port and the second port is determined. The forwarding data corresponding to the other of the first port and the second port not associated with the failure, is updated with the one of the first port forwarding data and second port forwarding data corresponding to the one of the first port and the second port associated with the failure. | 03-10-2016 |
20160072703 | Method and Apparatus for Pseudowire Redundancy - Methods and apparatuses for PW redundancy have been provided. A network node across a first domain and a second domain is disclosed. In each domain, the network node and at least one second network node form a first redundancy group (RG) in the first domain and a second RG in the second domain. The network node comprises a first set of interfaces facing the first domain, a second set of interfaces facing the second domain, and a forwarder. In the first set, at least a first and a second interfaces are configured for connecting with PW segments within the first domain; in the second set, at least a first and a second interfaces are configured for connecting with PW segments within the second domain. A third interface in the first set and a third interface in the second set are configured for transferring traffic between the network node and the at least one second network node and between the first domain and the second domain. The forwarder is configured for forwarding traffic selectively between one interface of the first set and one interface of the second set. | 03-10-2016 |
20160094489 | L2 Redirection in Multi-Chassis LAG Environments - Methods, systems and computer readable media for L2 redirection in multi-chassis link access group (LAG) environments are described. In some implementations, the method can include determining, at a core switch, a failure of a link in a split multi-link trunk (SMLT), and building, at the core switch, a table mapping each destination media access control (MAC) address to an incoming split multi-link trunk port. The method can also include sending, from the core switch, a link layer discovery protocol (LLDP) redirect message on a per-destination MAC address and per-source access switch basis. The method can further include maintaining a same mapping for each MAC address not hashed to a cluster peer with the failed link or being mapped to a non-inter switch trunk (IST) port. | 03-31-2016 |
20160099863 | SYSTEM ANALYZER AND METHOD FOR ANALYZING AN IMPACT OF A CHANGE IN A COMPONENT OF A DISTRIBUTED CONTROL SYSTEM - A system analyzer and a method for analyzing an impact of a change in a component of a distributed control system (DCS) are disclosed. The system can collect and store data representing the DCS components and their interconnection as well as signals of the DCS components. The DCS can be graphically modeled with nodes and directed edges, wherein a node represents either a type of DCS component or a signal of a DCS components, and wherein an edge is an “influence”-edge, or a “contains”-edge. Information on a change of a DCS components is received, a depth first or breadth first search is performed over the “influence”-edges and “contains”-edges and determine unchanged DCS components which would be affected by a malfunction, a removal or a taking out of operation of the at least one DCS component, and information on the affected DCS components is transmitted to an operator interface. | 04-07-2016 |
20160099865 | REROUTING TUNNEL TRAFFIC IN COMMUNICATION NETWORKS - Methods, apparatus, systems and articles of manufacture (e.g., physical storage media) to reroute tunnel traffic in a network are disclosed. Example methods disclosed herein include, in response to detecting an event associated with routing first traffic in the network, determining a plurality of paths to carry respective traffic for a plurality of tunnels between pairs of routers in the network, the plurality of paths being determined based on a quality metric characterizing an aggregate tunnel bandwidth to be carried by the plurality of paths for the plurality of tunnels. Such disclosed example methods also include sending first routing information describing the plurality of paths to the routers in the network to cause the routers to route the respective traffic for the plurality of tunnels using the plurality of paths. | 04-07-2016 |
20160100324 | METHOD AND APPARATUS THAT PROVIDES FAULT TOLERANCE IN A COMMUNICATION NETWORK - Aspects of the subject disclosure may include, for example, a system for detecting a fault in a first wire of a power grid that affects a transmission or reception of electromagnetic waves that transport data and that propagate along a surface of the first wire, selecting a backup communication medium from one or more backup communication mediums according to one or more selection criteria, and redirecting the data to the backup communication medium to circumvent the fault. Other embodiments are disclosed. | 04-07-2016 |
20160112156 | Error Correction Method and Apparatus for Radio Link Data - The embodiments of the present invention disclose a method and an apparatus of error re-correction for data of a radio link, and the method includes: when data of a plurality of radio links of a same user equipment received by a base station controller are all incorrect, the base station controller performing bitwise comparison processing on data of two radio links therein, obtaining a difference bit position sequence of the data of the two radio links; performing incorrect route segmentation processing on the data of the two radio link according to the difference bit position sequence, obtaining a plurality of incorrect route groups; performing cross substitution processing on incorrect route groups in the data of the two radio links by groups, and performing check processing on obtained data of a new radio link, until obtaining data of a radio link that are checked successfully. | 04-21-2016 |
20160112248 | COMMUNICATION NODE, COMMUNICATION SYSTEM, PACKET PROCESSING METHOD, AND PROGRAM - A communication node includes: a packet processing unit which processes received packets by referring to a first table(s) that stores an entry(ies) defining match conditions against which the received packets are matched and a processing content(s) applied to packets that match the match conditions; and an autonomous operation unit which refers to a second table(s) in which an event(s) is associated with a change(s) applied to an entry(ies) stored in the first table(s) when occurrence of the event(s) is detected and which rewrites an entry(ies) in the first table(s) on the basis of an event(s) that has occurred. | 04-21-2016 |
20160112349 | METHOD FOR PROVIDING PROTECTION SWITCHING SERVICE IN VIRTUAL TENANT NETWORK AND CONTROLLER THEREFOR - A method for providing a protection switching service in a virtual tenant network (VTN) and a controller are provided. The method enables a real-time protection switching setup on a VTN path in order to provide reliability of a VTN service. | 04-21-2016 |
20160112350 | SYSTEMS AND METHODS FOR SERVER AND SWITCH FAILOVER IN A BLACK CORE NETWORK - A black core network system and method, wherein the system includes a ciphertext network, a server having a bonding module and a plurality of network interfaces, a plurality of encryptor devices and one or more routers, wherein each router is connected through one or more of the server network interfaces to the server and through one or more encryptor devices to the ciphertext network. The server establishes, in the bonding module, a server gateway for each server network interface, selects a first network interface as primary link and a second server network interface as backup link, and sends routing metric information out through the primary link and the backup link, wherein sending includes sending metric information indicating that the cost of routing through the primary link is less than the cost of routing through the backup link. When the server receives, from one of the one or more routers, an indication that there is a link failure on the primary link, the server manipulates the server gateway for the second server network interface to direct traffic for the primary link out the second server network interface, wherein the second link becomes the new primary link and the server sends routing metric information out through the new primary link to the second router. | 04-21-2016 |
20160119255 | Partial Software Defined Network Switch Replacement in IP Networks - The claimed subject matter is directed to novel methods and systems for a network topology wherein an Internet Protocol (IP) network is partially integrated and enhanced with a relatively small number of Software Defined Network (SDN)-Openflow (SDN-OF) enabled network devices to provide a resilient network that is able to quickly recover from a network failure and achieves post-recovery load balancing while minimizing cost and complexity. The SDN-OF Controller, or a management node, determines such a minimum set of SDN-OF enabled devices and establishes IP tunnels to route traffic from nodes affected by failure to designated SDN-OF switches and finally to the final destination without looping back to the failed link or node. By combining SDN-OF enabled switches with IP nodes such as routers, a novel network architecture and methods are described herein that allows for ultra-fast and load balancing-aware failure recovery of the data network. | 04-28-2016 |
20160127136 | NETWORK CONNECTION RE-ESTABLISHMENT METHOD, RELATED DEVICE AND SYSTEM - An embodiment of the present invention discloses a network connection re-establishment method, including: detecting whether gateway resetting occurs, and if it is detected that gateway resetting occurs, sending a network connection re-establishment trigger message to an access node when a downlink packet sent by a packet data network is received, where the access node re-establishes, according to a type of the gateway resetting, a network connection corresponding to the downlink packet, and the type of the gateway resetting is resetting of a data gateway or resetting of a serving gateway. The present invention can be used to quickly re-establish a network connection, and can be applied to a situation in which a serving gateway and a data gateway are integrated. | 05-05-2016 |
20160134517 | AVOIDING DATA TRAFFIC LOSS IN A RING MULTIHOMED, IN AN ACTIVE-STANDBY MANNER, TO A TRANSPORT NETWORK - Data traffic loss in a an Ethernet Ring that is multihomed, in an active-standby manner, to a VPLS transport network (such as a Border Gateway Protocol (BGP) multihomed Ethernet Ring, an MC-LAG multihomed Ethernet Ring, or some other type of active-standby multihomed Ethernet Ring, etc.) (ring) is avoided. The exemplary multihomed ring running Ethernet Ring Protection (ERP) protocol includes a Ring Protection Link (RPL), a first node and a second node linked with a designated border router and a standby border router of the network, respectively. The data traffic loss in the multihomed ring is avoided by (i) receiving an indication that the link between the first node and the designated border router has failed; and (ii) invoking, responsive to the received indication, an ERP Media Access Control (MAC)-flush in the ring, even in the absence of a failed link in the ring and without activating the specified RPL. The ERP MAC-flush causes subsequent data packets from each of the plurality of nodes in the ring to be forwarded to the standby border router via the second node. | 05-12-2016 |
20160142286 | DUAL NODE INTERCONNECTION PROTECTION SWITCHING METHOD AND APPARATUS - Provided is an operation method of a node, the method including recognizing multiple failures occurring in a protected domain, transmitting a message including failure information, multiple-failure information, and used path information to a second node when the multiple failures are recognized, and performing a protection switching to a used path determined based on a priority for each of the multiple failures. | 05-19-2016 |
20160149725 | PACKET FORWARDING - A gateway RB may search for an ARP entry of the destination IP address of an IP packet. The gateway RB may generate an Ethernet header based on a VLAN identification and a MAC address in the found ARP entry and a first local MAC address. The gateway RB may generate an Ethernet packet by adding the generated Ethernet header to the IP packet, and send out the Ethernet packet via an egress port in the found ARP entry; wherein the founded ARP entry is generated by the gateway RB based on a received TRILL-encapsulated ARP packet and a VSI on the gateway RB associating with the first local MAC address and the destination IP address of the IP packet belong to the same VLAN. | 05-26-2016 |
20160165463 | STAND-BY CONTROLLER ASSISTED FAILOVER - Methods and systems for standby controller aided failover are provided. According to one embodiment, an active control channel and an active data channel are established by an active controller with a managed device via a management protocol. A standby control channel and a standby data channel are established by a standby controller with the managed device via the management protocol. A keep-alive message is periodically sent by the standby controller to the active controller. When a response to the keep-alive message is not received by the standby controller within a predefined time, failover from the active controller to the standby controller is initiated by: (i) taking over for the active controller; and (ii) notifying the managed device to direct subsequent management protocol messages to the standby controller via the standby control channel. | 06-09-2016 |
20160173366 | NODE PROTECTION FOR SEGMENT ROUTING ADJACENCY SEGMENTS | 06-16-2016 |
20160182277 | SYSTEMS AND METHODS FOR BROADBAND BACKUP | 06-23-2016 |
20160197822 | PACKET PROCESSING METHOD AND SYSTEM, AND DEVICE | 07-07-2016 |
20160254990 | SELF-HEALING CAM DATAPATH IN A DISTRIBUTED COMMUNICATION SYSTEM | 09-01-2016 |
20170237604 | RESPONSE TO AN INOPERATIVE NETWORK DEVICE MANAGED BY A CONTROLLER | 08-17-2017 |
20170237654 | FAST FAILOVER RECOVERY IN SOFTWARE DEFINED NETWORKS | 08-17-2017 |
20190149458 | METHOD AND APPARATUS FOR RELOCATING AND RESOTRING CONNECTIONS THROUGH A FAILED SERVING GATEWAY AND TRAFFIC OFFLOADING | 05-16-2019 |