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62 results about "Label switching router" patented technology
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A label switching router (LSR) makes up the core of a label-switched network. Label-switched networks are made up of predetermined paths, called label-switched paths, (LSPs) which are the result of establishing source-destination pairs by the process called Multi-Protocol Label Switching (MPLS).
Detecting data plane liveliness of a label-switched path
ActiveUS7463591B1Error preventionFrequency-division multiplex detailsForwarding equivalence classNetwork packet
Detecting if a label-switched path (LSP) is functioning properly. To test that packets that belong to a particular Forwarding Equivalence Class (FEC) actually end their MPLS LSP on an label switching router (LSR) that is an egress for that FEC, a request message carrying information about the FEC whose LSP is being verified may be used. The request message may be forwarded like any other packet belonging to that FEC. A basic connectivity test as well as a fault isolation test are supported. In a basic connectivity test mode, the packet should reach the end of the LSP, at which point it is sent to the control plane of the egress LSR. The LSR then verifies that it is indeed an egress for the FEC. In a fault isolation test mode, the packet is sent to the control plane of each transit LSR, which performs various checks that it is indeed a transit LSR for the LSP. The transit LSR may also return further information that helps check the control plane against the data plane, i.e., that forwarding matches what the routing protocols determined as the path. A reliable return path is used for the reply.
Owner:JUMIPER NETWORKS INC
Communicating constraint information for determining a path subject to such constraints
InactiveUS7319700B1Error preventionFrequency-division multiplex detailsPathPingDistributed computing
Path determination constraints may be encoded in the form of a program having one or more instructions. Each of instructions may include an operation code, and operands (or pointers to locations where operands are stored). In this way, an extensible, interoperable way for a nodes (e.g., label-switching routers) to communicate constraints within a network is provided. Such constraints may be inserted (e.g., as one or more CONSTRAINT objects) into signaling messages (e.g., a PATH RSVP message). By enabling the signaling of constraints, the determination of constraint-based (label-switched) paths can be distributed among a number of (label-switching) routers or other nodes. Upon receiving a message with constraints (e.g., a CONSTRAINT object(s)), a node may (i) ignore the constraints if the node is a tail-end node (label-switching router), (ii) apply the constraints to a link if the next hop in the (label-switched) path is strict, and / or (iii) perform a constraint-based path determination to a next hop if the next hop is loose.
Owner:JUMIPER NETWORKS INC
Detecting data plane liveliness of a label-switched path
InactiveUS20090086644A1Error preventionFrequency-division multiplex detailsForwarding equivalence classNetwork packet
Owner:JUMIPER NETWORKS INC
Communicating constraint information for determining a path subject to such constraints
Owner:JUMIPER NETWORKS INC
Fast rerouting method and label exchange router
InactiveCN101369958AAchieve protectionImprove reliabilityData switching networksType-length-valuePath protection
The invention relates to quick heavy-route method and label switching router. The method comprises: setting standby path for label switching path based on constrained routing and binding with the label switching path, first node of label switching path receiving notice information with path protection type-length-value TLV from insert knot of standby path when the label switching path is in failure, switching data of failure path to standby path for label transmission. The inventive example provides a label exchange tunnel based on constrained condition as prefabricated standby path to protect CR-LSP and avoid link and node failure.
Owner:HUAWEI TECH CO LTD
Distributed label switching router
Owner:RPX CLEARINGHOUSE
Method and apparatus for composing virtual links in a label switched network
InactiveUS7212526B2Add supportReduce the amount requiredMultiplex system selection arrangementsCircuit switching systemsHash functionForwarding equivalence class
A method for managing virtual links within a multiple protocol label switched network is provided. A virtual link which includes a set of links between two devices is regarded as a single entity by a control component of a label switching router. Each packet to be transported on the virtual link is labeled based on its assigned forwarding equivalence class. A specific label is bound to a corresponding forwarding equivalence class. Such packets can be forwarded onto any one of the links within the virtual link. To load balance the various links within the virtual link, different selected hash functions are used at selected times to apportion the packets. depending on the load conditions.
Owner:HITACHI LTD
Method for sharing backup path in MPLS network, label switching router for setting up backup in MPLS network, and system therefor
A method for sharing a backup path in a MultiProtocol Label Switching (MPLS) network, a label switching router (LSR) for setting a backup path in an MPLS network, a system for setting a backup path in an MPLS network, and a recording medium therefor are provided. The method includes the steps of acquiring link configuration information of links included in a working path when the working path is set between a source node and a destination node, and allocating bands for a backup path using the link configuration information when the backup path is set between the source node and the destination node. In the method, an optimal band is allocated to each of links included in a backup path by calculating a band using information, which is obtained during setting of a working path, about at least one other working path sharing links with the working path when the backup path is set, thereby efficiently managing network resources without wasting them.
Owner:ELECTRONICS & TELECOMM RES INST +1
Communication connection bypass method capable of minimizing traffic loss when failure occurs
ActiveUS7058845B2Consume resourcesReduce the amount requiredError preventionTransmission systemsDistributed computingBackup
Backup LSPs (label switched path) are established from LSRs (label switching router) except the egress LSR of a main LSP. Each backup LSP is established between an LSR that functions as a starting node and the egress LSR so as not to include any link or node on the main LSP to be protected. When the backup LSP is established such that it merges into another pre-established backup LSP protecting the same main LSP, merging is performed at the LSR located at the merge point.
Owner:NEC CORP
Method and system for establishing label switched path and network node
ActiveCN101741709AAvoid the build processBuild automatic avoidanceData switching networksForwarding equivalence classNetwork management
The invention discloses a method and a system for establishing a label switched path and a label switching router, and belongs to the field of communication. The method comprises the following steps: sending a label request message which carries attribute sign information of an equivalent multi-path router of an forwarding equivalence class to a downstream node by a node on the edge of an inlet, sending the label request message to a next hop node according to the attribute sign information by the downstream node receiving the label request message; and performing label mapping according to a path of the label request message by the node receiving the label request message, performing label binding for the forwarding equivalence class, and establishing the label switched path. The method avoids establishing the equivalent multi-path router for the forwarding equivalence class with a special requirement through the introduction of the attribute sign information for establishing the equivalent multi-path router or not in the process of establishing the label switched path, thereby contributing to network management and maintenance.
Owner:HUAWEI TECH CO LTD
Backhaul multicasting using Ethernet-based radio access networks
InactiveUS7096039B2Improved downlink backhaul serviceDirection easySpecial service provision for substationSubstation equipmentRadio access networkNetwork on
The present invention sets forth a methodology for providing improved downlink backhaul services from a radio network controller (RNC) to a plurality of base stations via a backhaul network that provides Ethernet services. The Ethernet services are provided by a group of provider edge (PE) switches and regular label switch routers (referred to as P switches). Base stations within the network are assigned into clusters, each of the clusters having a cluster ID. The RNC transmits packets to a given switch or switches out on the network based on a cluster ID included within the transmitted packet. The communications traffic is then multicast from at least one last hop switch in the network to candidate base stations on the basis of the cluster ID and an active set within the cluster. Advantageously, the clusters act as subgroups for more easily directing the transmission of the backhaul multicast traffic. Significant advantages are realized through use of the present invention, including the ability to allow faster and smoother handoffs, as well as backhaul bandwidth savings since intelligence regarding cell switching is extended out at a point farther along the network than was previously enabled.
Owner:LUCENT TECH INC
Monitoring communications networks
ActiveUS7142518B2Avoid signal lossMore efficient web broadcastsError preventionFrequency-division multiplex detailsComputer networkLabel switching router
Selected data (LSP1, LSP2) is monitored among other data passing through label switched paths (LSPs) of a communications network of interconnected label switching routers (LSR–LSR4). The method comprises designating at least one of the routers (LSR3) as a monitoring station and at least one of the routers (here LSR3 also) as a probe interface station, and connecting a probe apparatus to that interface station. The monitoring station (LSR3) is configured to multicast forward the selected data for monitoring additionally to the probe apparatus via the probe interface (506). Also disclosed is a probe apparatus including means for configuring the router to perform multicast forwarding of selected data to the interface.
Owner:VIAVI SOLUTIONS INC
Trigger for packing path computation requests
InactiveUS20060176828A1Alleviate the conditionReduce failureError preventionTransmission systemsTraffic volumeTraffic capacity
A technique triggers packing of path computation requests (PCRs) for traffic engineering (TE) label switched paths (LSPs) that are sent from one or more label-switched routers (LSRs) to a path computation element (PCE) of a computer network. According to the novel technique, incoming PCRs are packed into sets in response to a certain event, and one or more TE-LSPs (paths) are computed for each PCR of a particular set based on the PCRs of that set. Specifically, the PCE detects an event in the network (“network event”) indicating that an increase in the number of incoming PCRs has occurred, or that an increase is likely to occur due to, e.g., a change in a network element. Once the net-work event has been detected, the PCE packs the incoming PCRs into configured-length sets, such as, e.g., for a specified time interval or a certain number of PCRs. The PCE computes paths for each PCR of a particular set while considering the other PCRs of that set, thereby reducing race conditions, signaling overhead, and set-up failures.
Owner:CISCO TECH INC
Method and system for applying a multi-protocol label switching network in general packet radio service
ActiveUS7170869B2Reduce decreaseReduce routing delayNetwork traffic/resource managementDigital computer detailsGeneral Packet Radio ServiceDifferentiated services
The present invention discloses a method for applying a multi-protocol label switching (MPLS) network in general packet radio service (GPRS). The MPLS network is established by multiple differentiated service (DS) domains. Each DS domain is constructed by multiple label switching routers (LSRs) and label edge routers (LERs). The LER provides at least a service GPRS supporting node (SGSN) connected to a wireless network base station, and a gate GPRS supporting node (GGSN) connected to a packet switching network. At a signalling plane, IP addresses of all SGSNs and GGSNs are utilized to establish all one-to-one pre-created label switching paths (LSPs) in the MPLS network of the GPRS backbone network. At a transmission plane, the pre-created LSP and LSP tunneling transmit packets between SGSN and GGSN.
Owner:IND TECH RES INST
Mobile communication control method, data communication device, mobile base station, and mobile terminal
InactiveUS20100202344A1Reducing packet lossReducing band consumptionNetwork topologiesWireless commuication servicesAccess networkPacket loss
Disclosed is a technique which reduces the packet loss and the band consumption for data transfer when a mobile terminal conducts the handover between a fixed base station and a mobile base station for group movement. According to this technique, when an MH (mobile terminal) 320 conducts the handover from a fixed base station (E-LSR 230) positioned at an edge of an access network 200 to a mobile base station (MEB 310) located in a train or the like, a predetermined flag is appended to a frame addressed to the MH in a label switching router (P-LSR 210) positioned at a core network 100 side edge of the access network. The frame having the appended flag is copied in the E-LSR 230. One frame after copied is transmitted directly from the E-LSR to the MH while the other frame after copied is transferred from the E-LSR to the MEB and then transmitted from the MEB to the MH, thus realizing the soft handover.
Owner:PANASONIC CORP
Fault detection method, communication system and label exchange router
ActiveCN101316225AFlexible fault detectionError preventionData switching networksCommunications systemReal-time computing
The invention discloses a failure detection method, a communication system and a label switching router, aiming at overcoming the problem that BFD message analysis failure detection to a plurality of nodes cannot be realized in the prior art. The method comprises the following steps: the hop number between a first node and a second node on a main LSP is determined, and the second node is positioned at the downstream of the first node; a BFD message is encapsulated into a MPLS message which carries the hop number between the first node and the second node; the MPLS message is sent out along the main LSP from the first node; the node receiving the MPLS message judges if the node is the second node according to the hop number, if so, the node extracts the BFD message for detection so as to obtain a failure detection result, otherwise, the node transmits the MPLS message. By adopting the technical proposal of the invention, the failure detection in the MPLS can be more flexible.
Owner:HUAWEI TECH CO LTD
Method and device for protecting router
ActiveCN102123097AEasy to deployImprove protectionData switching networksBackup pathOperating system
The invention discloses a method and device for protecting a router. According to the invention, the configuration of a backup path for an end-to-end link between LSRs (Label Switching Router) is realized, and a corresponding forwarding item is established, therefore, the backup path can be used for protecting multiple arbitrary LSPs (Label Switched Path) on the link. Compared with the prior art, the invention has the advantages that the item capacity established through the technical scheme is fewer with more protected LSPs; and moreover, the tail node of the corresponding backup path is definite, which is more convenient to configure the protection switch mechanism of a network.
Owner:NEW H3C TECH CO LTD
Automation fallback to P2P LSPs for mLDP built multipoint-trees
ActiveUS20070217428A1Special service provision for substationData switching by path configurationCore routerComputer science
A method of using a point-to-point (P2P) label switched path (LSP) to transmit multicast data packets partially through a multiprotocol label switched (MPLS) network when one or more label switched routers (LSRs) of the MPLS are not multicast label distribution protocol (mLDP) enabled. The P2P LSP can be used to transmit multicast data packets to the head end of a point-to-multipoint (P2MP) LSP created with mLDP enabled LSRs. The P2MP LSP can be used to transmit the multicast data packets through the MPLS network to intended receivers that are external to the MPLS network. When configuring the P2MP LSP, an mLDP enabled LSR receives a first message from a non-mLDP enabled MPLS core router in response to sending a label mapping message to the non-mLDP enabled MPLS core router. In response, a directed LDP session is created between the mLDP enabled LSR and an edge LSR in one embodiment in response to receiving the first message from an MPLS enabled core router. The directed LDP session can be used to transmit a label mapping message to an ingress LSR.
Owner:CISCO TECH INC
Tunnel-based message forwarding method and label exchange router
ActiveCN101035081ASave resourcesEfficient use ofNetworks interconnectionChannel tunnelComputer science
The present invention provide a report approaches and transmit Label Switching router based on the tunnel, the entrance of the tunnel has been built Label Switching Router (LSR), the as-built tunnel export LSR and non-tunnel has been built in LSR posed by the Channel tunnel Label Switching (LSP) static allocation, and configuration LSR tunnel entrance has been built, the tunnel will have built their own entrance LSR reach the path downstream equipment identification information has been set to build the tunnel information, the establishment of the new tunnel completed; When the new tunnel needed to transmit text, in accordance with the method of transmitting LSP Tunnel text was transmitted, and arrived at the tunnel has been built the entrance LSR, in accordance with the entrance of the tunnel has been built LSR reach their downstream equipment will be on the path to the text information from as-built tunnel transponders until the new tunnel export LSR. Application of this invention program, the tunnel can be built into the new tunnel, so that we can effectively use the tunnel has been built to save the tunnel resources.
Owner:NEW H3C TECH CO LTD
Detection method of label switching path and label switching router
InactiveCN101848155AImprove stabilityImprove reliabilityData switching networksRouting tableIp address
The invention provides a detection method of a label switching path (LSP) and a label switching router. The detection method comprises the steps of: when carrying out fault detection on the LSP corresponding to an FEC (Forward Error Correction) code with a destination address being a same network segment IP address, after inquiring next hop information corresponding to the network segment IP address in a local route list by an inlet LSR (Launch Signal Responder) of the LSP, sending the BFD message to the outlet LSR corresponding to the next hop information; and after any one LSR in the LSP receives a BFD (Bidirectional Forwarding Detection) message, if recognizing that the LSR is not the outlet LSR of the LSP, inquiring next hop information corresponding to the network segment IP address in the local route list and forwarding the BFD message according to the inquired next hop information until the BFD message is sent to the outlet LSR of the LSP. The invention overcomes the defect that the traditional BFD detection technology is only capable of detecting the LSP corresponding to the FEC with the destination IP address being a host computer IP address, and successfully realizes the BFD detection on the LSP corresponding to the FEC with the destination IP address being the network segment address.
Owner:BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
Communicating constraint information for determining a path subject to such constraints
Path determination constraints may be encoded in the form of a program having one or more instructions. Each of instructions may include an operation code, and operands (or pointers to locations where operands are stored). In this way, an extensible, interoperable way for a nodes (e.g., label-switching routers) to communicate constraints within a network is provided. Such constraints may be inserted (e.g., as one or more CONSTRAINT objects) into signaling messages (e.g., a PATH RSVP message). By enabling the signaling of constraints, the determination of constraint-based (label-switched) paths can be distributed among a number of (label-switching) routers or other nodes. Upon receiving a message with constraints (e.g., a CONSTRAINT object(s)), a node may (i) ignore the constraints if the node is a tail-end node (label-switching router), (ii) apply the constraints to a link if the next hop in the (label-switched) path is strict, and / or (iii) perform a constraint-based path determination to a next hop if the next hop is loose.
Owner:JUMIPER NETWORKS INC
Trigger for packing path computation requests
InactiveUS7623461B2Alleviate the conditionReduce failureError preventionTransmission systemsPathPingPath computation element
A technique triggers packing of path computation requests (PCRs) for traffic engineering (TE) label switched paths (LSPs) that are sent from one or more label-switched routers (LSRs) to a path computation element (PCE) of a computer network. According to the novel technique, incoming PCRs are packed into sets in response to a certain event, and one or more TE-LSPs (paths) are computed for each PCR of a particular set based on the PCRs of that set. Specifically, the PCE detects an event in the network (“network event”) indicating that an increase in the number of incoming PCRs has occurred, or that an increase is likely to occur due to, e.g., a change in a network element. Once the network event has been detected, the PCE packs the incoming PCRs into configured-length sets, such as, e.g., for a specified time interval or a certain number of PCRs. The PCE computes paths for each PCR of a particular set while considering the other PCRs of that set, thereby reducing race conditions, signaling overhead, and set-up failures.
Owner:CISCO TECH INC
Multi-link failure processing method and label switching router
InactiveCN101026590ANormal transmissionNormal refreshData switching networksTraffic capacityMulti link
The method includes steps: receiving route information of switching routes of multiple protected labels; the said route information of switching routes of multiple protected labels from multiple different routes; transmitting prestored switching routes of multiple protected labels along the said multiple routes. The invention also discloses a label switching router. Under condition of multiple links in failure, the invention guarantees that prestored states for nodes on route for forwarding effective flow are updated in time so as to ensure normal transmission of traffic flow.
Owner:HUAWEI TECH CO LTD
Method for preventing label switch path oscillating and interim label switching router
ActiveCN101552729AReduce interactionReduce the impactData switching networksComputer scienceLabel switching router
The present invention discloses a method for preventing label switch path oscillating and an interim LSR. In the method, when LDP session of the interim LSR is down in downstream, releasing an FEC-label binding relationship from the LDP session, a interim LSP corresponding to the released FEC-label binding relationship is switched as agent outlet and maintained for a period of time, and updating the transmitting item to keep normal transmission. If maintenance time of the agent outlet LSP exceeds a preset time, then repealing the agent outlet LSP; if the LDP session returns to normal before maintenance time of the agent outlet LSP exceeds a preset time, then reverting the agent outlet LSP to an interim LSP according to a re-announced FEC-label binding relationship of the downstream LDP neighbor, and updating the transmission item again. In this way, when a downstream session of the interim LSP is oscillating, repeated repealing and creation of the LSP is prevented.
Owner:NEW H3C TECH CO LTD
Method, system and device for advertising adjacent network domain of DS-TE information
The embodiment of the invention discloses a method for advertising an adjacent network domain of DS-TE information, which comprises the steps of detecting whether the DS-TE information of a network domain and the adjacent network domain changes or not and carrying out advertisement in the network domain by link-state advertisement (LSA) when detecting that the DS-TE information of the network domain and the adjacent network domain changes. The embodiment of the invention also discloses a system and a device for advertising the adjacent network domain of the DS-TE information. By the method, the system and the device for advertising the adjacent network domain of the DS-TE information, an ingress label switching router (ingress LSR) or a path calculating element (PCE) can learn about the DS-TE information of the adjacent network domain.
Owner:HUAWEI TECH CO LTD
Method, system and device for establishing and removing cross-domain LSP (Label Switching Path)
InactiveCN102710519AReduce complexityLow costData switching networksForwarding equivalence classMulti protocol
The invention discloses a method for establishing a cross-domain LSP (Label Switching Path). The method comprises the following steps: after a target address corresponding to a forwarding equivalence class FEC is obtained by a label edge router (LER), if a longest matching route of the target address is searched locally, transmitting label REQUEST information of FEC to a next hop of label switching router (LSR) corresponding to the longest matching route; after the label request REQUEST information of FEC is received by LSR, if a longest matching route of the target address of the FEC is searched locally, transmitting label REQUEST information of FEC to a next hop of LSR corresponding to the longest matching rout or transmitting label MAPPING information of FEC to LER or LSR for transmitting the label REQUEST information of FEC. The invention further discloses a system and a device for establishing the cross-domain LSP, and a method, a system and a device for removing the cross-domain LSP, by adopting the invention, the problem of incapability of establishing or removing the cross-domain LSP under a DOD (Downstream On Demand) label distribution mode by the conventional seamless MPLS (Multi-Protocol Label Switching) network end-to-end device.
Owner:ZTE CORP
Internet telephone system ensuring communication quality and path setting method
ActiveUS7336603B2Reduce loadEnsure qualityInterconnection arrangementsError preventionCommunication qualityVoice communication
A method of setting a path in a network using an Internet protocol to facilitate voice communications between two devices includes determining whether a first path having an adequate bandwidth for transferring a voice over Intent protocol (VoIP) packet between two label switch routers exists. The method also includes setting a new path having a bandwidth that is at least two times the necessary bandwidth for transferring a VoIP packet, when it is determined that the first path does not exist.
Owner:JUMIPER NETWORKS INC
Method and system for network topology
ActiveCN104301219ASpeed up flooding convergenceGuaranteed rich featuresHybrid transportNetwork sizeTopological graph
A method and system for network topology. The method includes: dividing Label Switching Routers in a single control area into multiple sub-areas, wherein the Label Switching Routers in each sub-area constitute Open Shortest Path First neighbors; obtaining Traffic Engineer resource information on each said sub-area, collecting the Traffic?Engineer resource information on all the sub-areas, and generating a network topology diagram in the single control area.
Owner:NANJING ZHONGXING SOFTWARE
Method for controlling label notice message and maintaining LSP (Label Switching Path), and LSR (Label Switching Router)
ActiveCN102413034AEasy to controlAchieve maintenanceData switching networksLabel Distribution ProtocolComputer engineering
The invention provides a method for controlling a label notice message and maintaining an LSP (Label Switching Path), and an LSR (Label Switching Router). In the method, a state machine processing flow of a downstream LSP control block (DSCB) in the LDP (Label Distribution Protocol) network environment is set, so that the universality of the state machine is enhanced, practical requirements in the LDP network environment can be satisfied, and control of the label notice message and maintenance of the LSP are both realized.
Owner:NEW H3C TECH CO LTD
Message processing method, device and system
The invention discloses a message processing method, device and system, which realize decrease of a transmission time delay of each hop of physical device on a label switching path so as to reduce a message transmission time delay. In the message processing method, a first label switching router (LSR) receives a first multi-protocol label switching (MPLS) message; the first LSR carries out fragmentation processing on the first MPLS message to obtain a first MPLS fragmented message; and the first LSR sends the first MPLS fragmented message to a second LSR, wherein the first MPLS fragmented message comprises an MPLS label stack and a first MPLS fragmented message header, the MPLS label stack comprises a first label set and a second label set, and the first MPLS fragmented message header is encapsulated between the first label set and the second label set; a stack top label is a synonymous label, and a bit, in the synonymous label, representing a stack bottom identifier is set to be 1; and the first MPLS fragmented message header comprises a fragmented message sequence identifier.
Owner:HUAWEI TECH CO LTD
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