Abstract: A networked computer system in which a gateway is selected for efficient transmission over a network using a layered protocol. When a transmission over the network fails, information at multiple protocol layers indicates the usability of the gateway through which the failed transmission was made. In a layered protocol with an application or connection layer, a path layer and a link layer, information at the link layer is used to determine whether retransmission through the same gateway should be attempted. Information at the path layer is used to determine whether the gateway is faulty. Information from the application or connection layer is used to determine whether responses are received to transmissions. These determinations are used in setting the status of the gateway, which in turn is used to prioritize gateways when selecting a gateway for future transmissions.

Abstract: The present invention relates to techniques for allowing one or more edge nodes in a backbone network to quickly and efficiently switch traffic delivery from a first virtual network to a second virtual network in response to a failure occurring in association with the first virtual network. In certain embodiments, an edge node is capable of independently detecting that a failure has occurred on the first virtual network and quickly transitioning from the first virtual network to the second virtual network for receiving or delivering traffic. Upon detecting the failure in the first virtual network, the edge node will begin delivering traffic over the second virtual network. If control messages are not already being provided over the second network, the edge node may begin providing the control messages over the second virtual network.

Abstract: 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.

Abstract: Systems and methods for detecting and mitigating interference between from a wireless time division duplex (TDD) communications device and a wireless frequency division duplex (FDD) communications device includes processing quality-indicator reports received from the FDD device to determine if the FDD device has experienced interference from the TDD device. Such interference may be mitigated by adjusting a downlink configuration of the FDD base station in communication with the FDD device. To detect and mitigate interference from an FDD device to a TDD device, it is determined if a monitored value of an operational parameter of the FDD device is within a fixed range of a maximum value of the operational parameter, and if so, a specific time interval or frequency of the FDD device is assigned for communication purposes. Similar interference detection and mitigation techniques may also be used for interference scenarios between two TDD systems including TDD devices.

Abstract: A reliable asymmetric method for distributing security information within a Fiber Channel Fabric. The Switching Fabric includes a set of security servers, which maintain among themselves a replicated copy of the Fabric security databases using the currently defined Merge and Change protocols. The other Switches of the Fabric are configured as client-Switches. They maintain only the subset of the authorization and authentication information required for their correct operation. A client-Switch queries the security server when a new end-device is connected to it, or when it is connected to the Fabric. When the security configuration of the Fabric changes by an administrative action, a security server solicits the client-Switches to update their information. In an alternative embodiment, the end-devices may query directly the security server, usually for authentication purposes.

Abstract: To analyze traffic at an application level, a stream according to TCP or SCTP is required to be reconstructed and to be analyzed. When a packet is transferred to analyzing equipment using a port mirroring function with which a router and a switch are provided, transferred traffic volume increases and exceeds the throughput of the analyzing equipment. As only a part of packets configuring a stream is transferred to the analyzing equipment in transfer to the analyzing equipment using a packet sampling function, analysis at the application level is impossible. To solve the problem, when a packet communication unit recognizes a stream start packet, samples a stream initiated by the packet on a condition and at a rate respectively determined beforehand and generates a condition for copying the packet based upon information of both ends of the stream included in the packet, packets sampled in units of stream can be transferred to the analyzing equipment.

Abstract: A fault detection method, a communication system, and an LSR are provided herein to overcome the inability of performing BFD packet resolution fault detection for multiple nodes in the conventional art. The method includes: determining a hop count between a first node and a second node on an LSP, where the second node is located downstream of the first node; encapsulating a BFD packet into an MPLS packet that carries information about the hop count between the first node and the second node; sending the MPLS packet from the first node along the active LSP; and judging, by the node that receives the MPLS packet, whether this node is the second node according to the hop count. If this node is the second node, extract the BFD packet for detect, and obtaining a fault detection result. Otherwise, forward the MPLS packet. Through the technical solution provided by the invention, the fault detection is more flexible in the MPLS.

Abstract: The present disclosure eliminates the need for a buffer large enough to store a MAC PDU for the CRC check and eliminates processing delay involved in outputting data to, and inputting data from, the buffer. A wireless communication device analyzes and buffers an RLC data PDU, which is a data processing unit in the Radio Link Control layer (RLC layer), in the RLC layer without waiting for the completion of error detection processing, which is performed in the Medium Access Control layer (MAC layer), for a data processing unit (PDU) in the MAC layer. In the RLC layer, the wireless communication device references the result of the error detection processing for the MAC PDU performed in the MAC layer and creates an RLC Service Data Unit (RLC SDU) using an error-free RLC data PDU.

Abstract: Systems and methods are disclosed for testing a processor having at least a first interface. In one embodiment, the method includes configuring, at the processor, a second interface, such that the configured second interface has one or more quality of service parameters representative of the first interface; sending one or more packets through the configured second interface, the one or more packets being representative of another packet received at the first interface; and determining, based on the one or more packets, one or more performance parameters corresponding to the first interface under test.

Abstract: An access node anchoring a connection to, e.g., a PDSN in a core network establishes a session with a mobile station and assigns the mobile station an identifier such as a UATI. The anchor node sends the UATI to the PDSN, such as in a GRE key where the data link is a GRE tunnel. If the anchor node fails and data addressed to the mobile station comes to the PDSN, it may initiate a page for the mobile using the UATI. The anchor node may additionally send the PDSN the session seed and optionally the mobile station's network location. A registration zone may be defined to include access nodes within a predetermined distance of the anchor node, and the mobile station forced to re-register when moving outside of the registration zone. In this case, the PDSN may initiate a page for the mobile station only within the registration zone.

Abstract: A method for switching multicast traffic includes: entering, by a second router, a waiting state after receiving a packet indicative of recovery of a first router; and deleting, by the second router, the egress interface of MFIB entries on the second router after receiving a data packet or an Assert packet from the first router. A router and a system for switching multicast traffic are also provided herein.

Abstract: A network system comprises a first communication device being set up with a first address; and a second communication device connected with the first communication device via a network and being set up with a second address, wherein the first communication device includes a monitor frame transmitter configured to generate a monitor frame including the second address as a destination address and the first address as a source address, and to output the generated monitor frame to the network; and a monitoring-response frame monitor configured to monitor reception of a monitoring-response frame sent back from the second communication device, wherein the second communication device includes: a monitoring-response frame transmitter configured to, in response to reception of the monitor frame, generate the monitoring-response frame by exchanging the destination address in the received monitor frame for a source address and the source address in the received monitor frame for a destination address, and output the gen

Abstract: A line status monitoring circuit receives a frame through one of a number of lines from another node connected through a redundant transmission channel which is made redundant by the lines. The line status monitoring circuit includes a line-specific check frame monitoring unit. If a line-specific check frame having an added dedicated header corresponding to each of the plurality of lines is received through one of the lines from another node, the line-specific check frame monitoring unit determines whether or not a further line-specific check frame corresponding to a frame for checking which is identical to a frame for checking to which the line-specific check frame corresponds is received through at least a predetermined number of lines within a predetermined time. If the further line-specific check frame is not received in this manner, the line-specific check frame monitoring unit discards the frame.

Abstract: A method of implementing a p-cycle protection scheme for a communications network comprising a plurality of nodes and interconnecting communications links along which Ethernet traffic is forwarded in a connection-oriented manner. The method comprises for each said Ethernet node in the communications network determining a label associated with each connection-oriented Ethernet path along one or more links in said communications network for which an entry exists in a forwarding table of Ethernet switching apparatus located at said Ethernet node and mapping a plurality of said paths individually identified by said respective labels, to another path defining a p-cycle between logically adjacent nodes in said communications network, wherein each said p-cycle is provisioned in the same layer as said Ethernet traffic.

Abstract: A first node includes ports and a controller to receive a test packet at a first one of the ports. The first node determines whether the received test packet has a destination address that matches one or more predefined addresses associated with a second node. Presence of a loop in a communications network in which the first and second nodes are located is indicated in response to detecting receipt of the test packet containing the matching destination address.

Abstract: Methods, devices and systems for improved zone merge operations are disclosed. Two connected switches are arbitrated as an initiator and a receiver. The merge operation is initiated only by the initiator on an initiator/receiver inter-switch link. The initiator may initiate a merge request and the receiver may perform the computation of the difference between the old and the new zone. Either the whole configuration or only the differences are communicated between the switches. The merges may be done on a connected switch basis, not on a connected port basis. Only the principle ports in the principle inter-switch-link perform the merge operation. All the remaining ports, i.e. the non-principle ports, adopt the merge result of the principle ports. The zone information may also be cached on each switch such that merge calculations need not be performed again when a merge operation with the same configuration occurs in the future.

Abstract: Provided are methods, devices, and systems for maintaining a SIP survivable network. The present invention is adapted to allow SIP endpoints or User Agents to discover and select the controller or controllers that the SIP endpoint will register with. Selection of the controller or controllers may be based upon the relative attributes of the controllers and the needs of the SIP endpoint.

Abstract: A path control device included in a terminal device (300), which includes a path information generating unit (302) which generates path information indicating paths from a terminal (300) to a terminal (400), a path malfunction predicting unit (303) which predicts a malfunction on each of the relays, using the number of flows as a malfunction occurrence likelihood value, at least one of the relays that is a candidate for monitoring is determined for each path, and a bypass path selecting unit (304) which selects, when the malfunction is predicted on the at least one relay, a path that should be used for transmitting the data from the terminal (300) to the terminal (400), from the paths except the path including the relay on which the malfunction is predicted.

Abstract: A method and system for transmitting data corresponding to at least one endpoint device problem in a packet communications network is described. Specifically, an endpoint device detects at least one problem that pertains to the endpoint device. The endpoint device then generates data pertaining to the endpoint device problem. Lastly, the endpoint device then transmits the data detailing that endpoint device problem to the packet communications network.

Abstract: A method of detecting random access problems in a mobile station apparatus which uses multiple component carriers to perform random access. To achieve this, the mobile station apparatus, which is in a mobile communication system comprised of a base station apparatus and mobile station apparatuses, uses one random access channel transmission counter to detect random access problems in the plurality of component carriers.

Abstract: Methods and systems have been provided for pushing critical configuration to a set of network devices. According to various embodiments of the invention, a Network Management Station (NMS) creates a Simple Network Management Protocol (SNMP) context and an SNMP view. Additionally, the NMS specifies a network configuration and a set time period. The NMS pushes the network configuration to the set of network devices. The set of devices apply the network configuration after the set time period.

Abstract: An active loop-free topology established by a Rapid Spanning Tree Algorithm and Protocol (RSTP) emanates from an original root bridge. Upon a bridge directly connected to the root bridge suspecting a failure in the root bridge, the bridge directly connected to the root bridge generates a Root Failure Suspicion Notification (RFSN) Bridge Protocol Data Unit (BPDU) comprising a standard Rapid Spanning Tree (RSTP) BPDU portion and a compressed failed root identifier portion uniquely identifying the root bridge which is suspected of failing. The RFSN BPDU is propagated amongst the bridges in the network. The bridges which can identify a flag in the standard RSTP BPDU portion of the RFSN BPDU decompress the compressed failed root identifier and compare it to the stored root identifier at each bridge. If the received failed root identifier in the RFSN BPDU corresponds to the stored root identifier of the bridge, the bridge deletes the stored root identifier.

Abstract: The invention relates to a method for transferring data between a mobile component and a controller of an automation system with a link for linking the component to the controller. The component is assigned a memory area in the memory of the controller, in which data to be transferred to the component is stored and copied into memory areas assigned to all links, so that all links provided for communication with the component have the current data available to them, and into which current data is copied by the component out of the memory area of the link in the radio cell of which the component is currently located. For a user application running on the controller of the automation system a handover of the component between different radio cells is transparent, since the application merely accesses the always up-to-date component data in the memory area assigned to the component.

Abstract: Methods and apparatus provide single or multi-port, flexible, cost-effective, built-in self-test capabilities for network communications equipment, such as for example switches, and programmably generate, and subsequently analyze, one or more sequences of test packets, wherein the test packets simulate at least two flows of traffic. Such test packets can have programmable headers, payloads, and duty cycle. A line card embodying the present invention may generate its own traffic pattern, which may be similar or identical, to traffic patterns observed on Internet backbones. These traffic patterns may contain a bimodal distribution of control packets interspersed with data packets wherein the control packets and data packets are relatively short and long respectively. A plurality of test packet generators/receivers can be deployed in a network communications device having a plurality of ports. In such a configuration, test generator/receiver is associated with each of the plurality of ports.

Abstract: A communications network comprising components configured to implement a method comprising analyzing a path between a first end point and a second end point, and identifying a partial fault along the path is disclosed. Also disclosed is a method for communicating information within a network, the method comprising: defining a path traversing a plurality of nodes, receiving a fault report from an intermediate node, determining whether the fault report affects the path, and responsive to the determination that the fault report affects the path, transmitting the fault report to an upstream or downstream node in the path.

Abstract: A management system for use in a communication monitoring system, exchanging communication check information between external devices, and monitoring communication in the network, the management system including an information manager for managing topology information about each of a number of network apparatuses, representative information about a representative external device connected to a network apparatus connected to the management system, and adjacent information about one or more external devices adjacent to each of the external devices; and an information notifier for notifying each of the external devices of the topology information, the representative information, and the adjacent information supplied from the information manager.

Abstract: Methods, systems, and protocols are described for securing data in transit over networks. A communication session is initiated between a client and a server. One or more communication channels can be set up between the client and the server. Each established communication channel may have zero or more intermediary nodes that are selected by the client or by the server to process information exchanged between the client and the server via the communication channels.

Abstract: A system and method for managing video content streams are disclosed. The method includes receiving a plurality of multicast video streams at a server and buffering each video stream within a memory at the server. The method also includes generating a multicast video output at the server and a unicast video output at the server.

Abstract: A disk storage system for controlling a plurality of disk devices in multiple disk array systems consisting of disk array switches in a fiber channel connection where the disk devices are organized as multiple logical units. The multiple logical units are mapped between each other to improve high speed operation of the disk storage system and the disk storage system transfers data mutually between the two or more disk array switches improving performance and throughput.

Abstract: Methods, computer-readable storage media and systems may be provided for investigating a Quality of Service (“QoS”) disruption among nodes of a computer network that form a multicast forwarding tree. A topology of the multicast forwarding tree may be identified. Performance data may be collected at interfaces between nodes of the multicast forwarding tree. A source of the QoS disruption may be identified by mapping the performance data to the topology.

Abstract: A solution for monitoring a problem condition in a communications system is provided. A communications protocol implementation monitors the communications system for the problem condition. The communications protocol implementation can initiate a response based on the problem condition being present. In this manner, the communications protocol implementation provides an effective monitor for detecting and/or recovering from a problem condition in the communications system.

Abstract: A system for maintaining or optimizing a mobile phone network, the system includes a plurality of data feed inputs including at least one performance data feed input to receive performance data relating to performance of said mobile phone network over a first time period and at least one configuration data feed input to receive configuration data relating to configuration of said mobile phone network over a second time period; and a radio performance optimization system coupled to said plurality of data feed inputs, said radio performance optimization system including a rules engine to operate on said performance data and on said configuration data in accordance with a set of hierarchical rules and to output one or more tasks for network optimization, a said task including a definition of a potential fault, exception or optimization of said network to be investigated by a service engineer.

Abstract: Methods and systems are provided for real time simultaneous monitoring of logical circuits. In accordance with an example method, first status information is requested for a first logical connection at a host end of a logical circuit comprising the first logical connection. The logical circuit connects a host device to a remote device and traverses a first local access and transport area, an inter-exchange carrier, and a second local access and transport area. The first local access and transport area is at the host end of the logical circuit, and the second local access and transport area is at a remote end of the logical circuit. A logical identifier of the logical circuit is identified based on the first status information. A second logical connection at the remote end of the logical circuit is identified based on the logical identifier of the logical circuit. Second status information for the second logical connection is requested after identifying the second logical connection.

Abstract: Congestion is detected in a radio access transport network including one or more radio network controllers each coupled to one or more radio base stations. Multiple data packet flows are each associated with a mobile radio terminal communication, and each flow is controlled in the radio access transport network by a corresponding flow control entity. They are monitored for congestion in the transport network. If a congestion area in the transport network is detected for one of the monitored data packet flows, then a determination is made whether other monitored data packet flows share the detected congestion area. Congestion notification information is communicated to the flow control entities corresponding to the other monitored data packet flows that share the detected congestion area. Based on the congestion notification information, the informed flow control entities may take a flow control action, e.g., to enable fair sharing of communications resources in the transport network.

Abstract: A communication network includes a plurality of nodes and a plurality of links connecting between the nodes. A management computer managing the communication network has a storage means, an entry control means and a monitoring means. A route information indicating a transfer route of frames in the communication network is stored in the storage means. The monitoring means performs, based on the route information, transmission and reception of frames to and from the communication network. The entry control means instructs each node to set up a forwarding table indicating a correspondence relationship between an input source and a forwarding destination of frames. More specifically, the entry control means instructs the each node to set up the forwarding table such that frames are forwarded along the transfer route indicated by the route information.

Abstract: 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.

Abstract: An object of the present invention is to continue to send and receive to/from a host when a failure has occurred in a storage device interface. A storage system includes a host and a storage device connected to the host via a communication line, wherein the storage device comprises a communication controller performing data communication with the host by using optical modules, and wherein the communication controller is provided with first optical modules performing data communication with the host; a second optical module performing data communication with the host, in place of a first optical module; and a controller switching, when a failure has occurred in any of the first optical modules, the first optical module in which the failure has occurred to the second optical module.

Abstract: Re-routing interactions are predicted for a communications network including a plurality of network elements. A respective device state image is constructed for each of the plurality of network elements, with each of the device state images including a failover setting of a respective one of the network elements. The device state images are transmitted to a network simulator. The performance of the communications network is simulated in response to the device state images. A prospective network element failover of a predetermined one of the network elements is transmitted to the network simulator. A performance of the communications network is simulated in response to the device state images modified by the prospective network element failover. It is then detected whether an acceptable performance is maintained in view of the prospective network element failover in order to identify whether is will be permissible to perform a maintenance action on the network element which makes it unavailable to the network.

Abstract: A network device may include logic configured to receive a problem report from a second network device, where the problem report includes event data, determine at least one of an action to perform or whether reconfiguration information is associated with the event data in the received problem report and add information to the received problem report to provide a reformatted problem report and transmit the reformatted problem report to a third network device when it is determined that reconfiguration information is not associated with the event data in the problem report.

Abstract: A system receives a condition for an interactive voice response (IVR) application, automatically tests the IVR application based on the received condition, and generates a test result based on the automatic testing of the IVR application.

Abstract: A method can be used to detect a problem, isolate the cause of the problem to a particular device in which the cause resides, and potentially repairing the particular device. In one embodiment, the method can be fully automated using a system. In another embodiment, the method may be partly automated. In this particular embodiment, the system can perform most or all of the testing or diagnosis automatically. The system can perform the method until a point where human intervention is required. The problem, the cause, and particular device may be known at the time notification is sent to customer care, a workcenter, or another network operations center. With the information regarding the problem, cause and particular device, a technician or other personnel can be dispatched and repair the problem more quickly than if only the problem is provided and the technician needs to perform the testing and diagnosis.

Abstract: A network element is configured to function as a first virtual element and a second virtual element. A first monitoring packet is sent to the first virtual element via a label switched path. A second monitoring packet is sent to the second virtual element via an internet protocol path that includes at least a portion of the internet. A first condition of the network element is determined based on a response to the first monitoring packet. A second condition of the network element is determined based on a response to the second monitoring packet.

Abstract: Only when a request formed of a plurality of request packets obtained by dividing the request is reconstructed, the request is transmitted to a survey target node that returns a response formed of a plurality of response packets obtained by dividing the response. When no response packet has been received at all from the survey target node, it is determined that any of the request packets has been discarded on a first route from a surveying node as a transmission source of the request to the survey target node. When one or more response packets have been received from the survey target node but the response cannot be reconstructed, it is determined that any of the response packets transmitted from the survey target node has been discarded on a second route from the survey target node to the surveying node as the transmission source of the request packets.

Abstract: A computer system automatically recovers from a split segment condition in which a contiguous layer 2 network segment, comprising a plurality of contiguous paths each directly coupling one or more members of a team of network resources of the computer system to a core switch of a layer 2 network, is split into two or more noncontiguous segments each comprising a contiguous set of one or more of the plurality of paths. The computer system includes a team of network resources having one or more members that couple it to each one of the plurality of paths. A teaming driver binds the drivers of each member of the team and is coupled to the segment through the members of the team.

Abstract: Embodiments disclosed herein provide redundant connectivity between an Ethernet Automatic Protection Switching (EAPS) access network and a Virtual Private LAN Service (VPLS) network. A first VPLS node is provided to function as an EAPS controller node. A second VPLS node is provided to function as an EAPS partner node. The first and second VPLS nodes are linked by a pseudowire and an EAPS shared-link. Additional EAPS nodes are also provided. The additional EAPS nodes are linked to each other and one of the additional EAPS nodes is designated as a master node. Links are also established between the VPLS nodes and the EAPS nodes such that one or more EAPS rings are formed. Each EAPS ring includes the shared-link between the first and second VPLS nodes. The EAPS rings are monitored to detect link failures.

Abstract: A system and method are disclosed for monitoring communications of an individual in a packet network. A system that incorporates teachings of the present disclosure may include, for example, a network monitor having a communications interface coupled to a packet network, and a controller. The controller can be programmed to receive a request from a third party to monitor communications associated with an individual, convey to the third party information monitored on a group of one or more permanent virtual circuits (PVCs) of the packet network associated with the individual, detect an update in the group of one or more PVCs, determine new set of one or more PVCs associated with the individual, and convey to the third party information monitored from the new set of one or more PVCs.

Abstract: A system may forward to a network device an advertisement label mapping message that requests an establishment of an active performance monitoring (APM) control channel. Further, the system may process a reply label mapping message that is sent from the network device in response. The system may establish the APM control channel and a pseudowire associated with the APM control channel.

Abstract: A system for processing errors in a processor comprising, an error counter, a pass counter, and a processing portion operative to determine whether a first error is active, increment an error counter responsive to determining that the first error is active, increment the pass counter responsive to determining that all errors have been checked, and clear the error counter responsive to determining that the pass counter is greater than or equal to a pass count threshold value.

Abstract: The present invention provides a multi-path network for use in a bridge, switch, router, hub or the like, the multi-path network including a plurality of network ports; a plurality of network elements; and a plurality of network links interconnecting the network elements and the network ports for transporting data packets, each network element including a fault monitor for detecting faults on the network links to which the network element is connected, a plurality of dynamically selectable output ports and output port selection mechanism and each network element being adapted to communicate the existence of a fault back to one or more other network elements via which network elements the faulty network link can be bypassed, and each network element being adapted to update the output port selection mechanism when communication of the existence of a fault is received so that only output ports which ensure the faulty network link is bypassed are dynamically selectable.

Abstract: Techniques are provided for operating a network where router devices forward received data packets towards a destination node. Each router maintains a routing table, indicating the next hop to choose in respect of different ultimate destinations m accordance with a routing protocol. Periodic communications between neighboring routers are used as confirmation that they are still able to communicate with one another. Each router compares the time since it last communicated in this way with each of its neighbors with a router dead interval and determines that the respective neighboring router, or the currently designated route thereto, has gone down if the comparison indicates that the router dead interval has elapsed without such a communication having been received. Each router performs an adaptive algorithm to modify the or each corresponding router dead interval dynamically in accordance with one or more properties of the network as measured by the router.