78 results about "RSVP-TE" patented technology

An architecture and method for performing dynamic route discovery and time slot reservation provisioning within optical-switched networks. The method employs extensions to the RSVP-TE signaling protocol, which uses various messages to reserve resources. Under a peer routing embodiment, routing trees and resource availability data are maintained by the edge nodes. A lightpath route is dynamically selected based on selection criteria applied to the routing tree data and the availability of resources along the lightpath. Link state information, including resource reservation data, is broadcast by the switching nodes to update the edge nodes of their resource availability. A resource reservation message is passed between nodes defined by an explicit route contained in the message, and resource availability is confirmed for the entire lightpath prior to confirming the resource reservations.

A method and apparatus for providing point-to-multipoint label switch paths (LSPs) in a Multi-Protocol Label Switching (MPLS) network is described. In one embodiment, a point-to-multipoint LSP is built in a MPLS network by using Resource Reservation Protocol Traffic Engineering (RSVP-TE) to signal the point-to-multipoint LSP as separate point-to-point LSPs and to merge the separate point-to-point LSPs into the point-to-multipoint LSP.

An architecture and method for performing coarse-grain reservation of lightpaths within wavelength-division-multiplexed (WDM) based photonic burst-switched (PBS) networks with variable time slot provisioning. The method employs extensions to the RSVP-TE signaling protocol, which uses various messages to reserve resources. A resource reservation request is passed between nodes during a downstream traversal of the lightpath route connecting a source node to a destination node via one or more switching nodes, wherein each node is queried to determine whether it has transmission resources (i.e., a lightpath segment) available during a future scheduled time period. Soft reservations are made for each lightpath segment that is available using information contained in a corresponding label. If all lightpath segments for a selected route are available, a reservation response message is sent back upstream along the route from the destination node to the source node. In response to receiving the response, the soft reservations are turned into hard reservations at each node.

Provided are a method and apparatus of controlling a Label Switched Path (LSP) of a Resource Reservation Protocol-Traffic Engineering (RSVP-TE) protocol, which may define an available label in an End-to-End range when a label is not changed by transit nodes, and is determined only by an external management system or a manager, or an ingress node or an egress node, thereby more simply and effectively operating the RSVP-TE protocol, and removing limitations in functions of nodes such as path calculating.

A flow label negotiation method is disclosed. The method in the embodiments of the present invention includes: constructing an RSVP-TE path message, where the path message includes a first FL capability flag bit; marking a local FL transmit and receive capability in the first FL capability flag bit; sending the path message to an egress node through a load distribution node; receiving an RSVP-TE resv message which is sent by the egress node through the load distribution node, where the resv message includes a second FL capability flag bit; and obtaining, from the second FL capability flag bit, an FL transmit and receive capability of the egress node, and completing FL negotiation. In addition, the embodiments of the present invention further provide a related device and a system for implementation of the method.

A system of hitless restart in a network, where at least one node in the network provides routing control distributed among ingress ports (ingress cards) and egress ports (egress cards), is disclosed. With distributed routing control, each ingress card has its own routing-control software and each egress card has its own routing-control software. When the routing-software at an ingress port or an egress port of a node is restarted, current connections traversing a restarting ingress card or a restarting egress card continue to function normally during a restart period without data loss. The disclosed system is tailored to a multi-protocol label switching (MPLS) network employing distributed-resource-reservation-protocol traffic engineering (RSVP-TE). The system relies on messaging between ingress card control planes, ingress card data planes, egress card control planes, and egress card data planes of a restarting node.

A technique dynamically retrieves reachability information from a target node, including a tail-end or any intermediate node, along a traffic engineering (TE) label switched path (LSP) that spans multiple domains in a computer network. The interdomain information retrieval technique is illustratively based on a request / response signaling exchange whereby at least a portion of the reachability, i.e., routing, information maintained by the target node is propagated to a head-end node of the TE-LSP. The routing information may comprise a list of address prefixes reachable by the target node, but may optionally include next-hop and metric attributes associated with those prefixes. The head-end node uses the retrieved routing information to calculate routes reachable from the target node for insertion into its routing table.

A system, device, and method for traffic and subscriber service differentiation using multiprotocol label switching (MPLS) creates different service tiers, where each service tier is associated with a unique combination of resource class (color) and hold priority. Enhanced MPLS devices separate traffic into separate queues based upon service tier. Standard MPLS devices are typically configured to separate traffic for different service tiers under normal operating conditions. Enhanced MPLS devices signal service tier using a predetermined signaling protocol such as RSVP-TE or CR-LDP.

Techniques are described for establishing an overall label switched path (LSP) for load balancing network traffic being sent across a network using the a resource reservation protocol such as Resource Reservation Protocol with Traffic Engineering (RSVP-TE). The techniques include extensions to the RSVP-TE protocol that enable a router to send Path messages for establishing a tunnel that includes a plurality of sub-paths for the overall LSP. The tunnel may comprise a single RSVP-TE Label Switched Path (LSP) that is configured to load balance network traffic across different sub-paths of the RSVP-TE LSP over the network.

The invention discloses a migrating method based on state transition in automatic exchange optical network, including: judging the value of a migrating status bit by setting migrating status bit in connection information field for identifying migrating operational state and combining information of signaling scene carried by standard signaling, so as to complete the mutual migrating between permanent connection and soft permanent connection. Application of the invention is smoothly compatible with the signaling deleted by general connections, does not make any changes to the signaling process. Standard RSVP-TE or CR-LDP signaling is differentiated to be deleted, or migrating SPC to PC and migrating PC to SPC according to the signaling scene values carried from the first nodes to downstream; whether the resource implementing authority is migrated or released is judged by strict state control, so as to ensure the false delete of resources after receiving delete signaling, and further to ensure that it is certainly PC after a migrating SPC to PC or migrating PC to SPC is in failure.

The invention discloses a TE (Traffic Engineering) tunnel establishing method and equipment. The method comprises the following steps: routing equipment and adjacent routing equipment mutually receive and send link state messages, wherein fields used for identifying RSVP-TE (Resource Reservation Protocol-Traffic Engineering) configuration properties of links are carried in the link state messages; the routing equipment collects link state information in an MPLS (Multiple Protocol Label Switching) network and forms a TEDB (Traffic Engineering Database) according to the link state messages; the routing equipment operates a CSPF (Constraint based Shortest Path First) algorithm, and selects a link configured with a RSVP-TE protocol in the TEDB; and the routing equipment establishes a TE tunnel according to the selected link. In the invention, the TE tunnel can also be normally established under the condition that an equivalent link exists in an MPLS network.

The invention relates to a survivability method based on identification of reliable service in an optical communication multi-domain optical network, which comprises the following steps that: 1) a single-domain route controller forms an interoperation control plane by automatically discovering and searching a peer route controller of the single-domain route controller by neighbors; 2) the route controller realizes topology abstraction belonging to a single domain to obtain and store aggregation routing information; 3) a source node receives service connecting requests; 4) the source node sends a route establishing request to the route controller positioned in the domain; 5) a source route controller operates an end-to-end work / protection routing algorithm based on conditional risk separating degree on a convergent network; 6) the source route controller returns a request response message to the source node and initiates a resource reservation request; 7) the source node adds the returned work / protection route into an RSVP-TE PATH message which performs path request along an appointed route; 8) a wavelength is selected through a wavelength assignment algorithm; and 9) the message is returned along the prior path of the PATH message to complete the resource reservation of the source node. The method has the advantages of high network availability and high resource utilization rate.

Virtual routers that abstract photonic sub-domains are provided for GMPLS networks. A virtual router uses a link viability matrix to keep track of the set of viable connections between inputs and outputs of a photonic sub-domain. A virtual router may receive RSVP-TE signaling messages and either allocate a working input to output link pair or, if explicitly signaled, verify that the requested link is currently viable. A virtual router also advertises, in its link state updates, the current set of possible outputs for any input link. Shortest path computations can be implemented utilizing virtual routers by modifying a topology graph in accordance with the link viability matrix of the virtual router.

The invention discloses a resource reservation protocol tunnel management method based on flow rate engineering, solving the technical problem that irrelevant IGP TE topology change information affects a RSVP-TE tunnel under the condition that a plurality of IGP TE topology domains in a network. The method comprises the following steps of: spreading a new object in PATH information; recording IGPTE topology information when computing CSPF by the object; after receiving the PATH information by downstream equipment, binding the IGP TE topology information in the information and an interface corresponding to the tunnel; and when receiving the TE topology change information announced by the IGP, comparing the IGP TE topology information recoded on the tunnel with the information in the topology change information to decide whether the tunnel needs to respond to the IGP TE topology change information. The invention can prevent the irrelevant IGP TE topology change information from affecting the RSVP-TE tunnel, thereby improving the stability and the reliability of the tunnel.

The invention provides a resource reservation protocol-traffic engineering (RSVP-TE)-based resource reservation method capable of allocating priorities to services requiring connection and processing according to the priority, namely a priority-based inter-domain resource reservation method, which is applied to an all-optical network with a multi-layer multi-domain control sub-network. The technical key points are that different priorities are allocated to the services requiring connection, and a resource reservation process is completed by two steps of temporary reservation and definite reservation. The method has lower service blocking rate than a forward reservation protocol (FRP), has shorter service connection establishing time than a backward reservation protocol (BRP), greatly optimizes network performance, overcomes the defect that the conventional resource reservation methods cannot adapt to the multi-layer multi-domain optical network environment, and effectively establishesLSP in the multi-layer multi-domain network with wavelength conversion capacity. Meanwhile, service priority differentiation is supported, and the service with higher priority request the resource reservation in priority; and the method meets the requirement of development of future ASON networks.

The invention is a segment protection method for MPLS-TP network. the method notifies the information of each protection segment to all nodes on the protected LSP by combining RSVP-TE signaling, so that after the fault is generated, the fault information can be effectively notified to the protection segment starting point of the fault by the fault downstream node. Then, the starting point can switch the service influencing by the fault on the protection segment indicated by a display protection route according to the stored display protection route information b oneself to implement the protection of the fault service. According to the method of the invention, the segment protection of LSP in the MPLS-TP can be implemented, the lower network resource occupancy rate and the shorter protection switching time can be obtained.

A method of requesting reservation of a label switched path (LSP) for traffic of a type compatible with ITU-T G709 amendment 3, in an optical transport network by sending a RSVP-TE path message for the reservation of the requested LSP from an ingress node of the requested path, via intermediate nodes along the path to an egress node, and sending a RSVP-TE resv message from the egress node, to cause the nodes to reserve resources for the requested path. The path message has a signal type field having values assigned to indicate traffic types specified in G.709 amendment 3 beyond those specified by G.709 pre amendment 3, without reuse of values specified by G.709 pre amendment 3. Since the nodes along the path can still distinguish in the signal type field any values of the signal type field specified by G.709 pre amendment 3, new nodes can still work with legacy messages.

An embodiment of the invention provides a device for realizing graceful restart under of resource reservation protocol and a method thereof. Specifically the circuit card or control card of the label switch router LSR is disposed of a signaling information dispensing unit, a signaling managing unit and a signaling processing unit. The dispensing and processing of RSVP-TE signaling information and controlling the corresponding GR processing procedure are executed on the base of each unit. Thus the distributed disposition of RSVP-TE living example can be effectively realized. At the same time a GE realizing plan under distributed disposition is given to realize the equal and effective distribution of LSP among a plurality of RSVP-TE living examples. Thereby the system can support larger capability standard and increase the system performance.

The invention discloses a path calculation method of a loose node in an RSVP-TE (Resource Reservation Protocol-Traffic Engineer) tunnel, the loose node, a non-loose node and the RSVP-TE network. The method comprises the following steps that: each node in the RSVP-TE network sends a PATH message carrying the router ID (Identifier) of the node to a downstream node; when the path of the loose node is calculated, the router ID is used as a constraint condition of path exclude to submit to CSPF (Constrained Shortest Path First) to calculate the path. The loose node comprises a receiving module, a path calculation module and a message generating module; the non-loose node comprises a message generating module and a sending module; and the RSVP-TE network comprises the loose node and the non-loose node. The local router ID of an upstream node is used as a constraint condition of the path exclude, so that the possibility of a loop generated when the path of the loose node is calculated is greatly reduced.

The invention discloses a method and system for realizing hot backup in a centralized network node. A main control module and a backup control module are arranged in the network node; an RSVP-TE tunnel is established for service, wherein the RSVP-TE tunnel contains two label switched paths (LSPs), one is a main LSP, and the other is a backup LSP. The method comprises the following steps: the main control module obtains the control information of the main LSP and backup LSP and sets the identification information of the control information of the main LSP and backup LSP to be active or inactive according to the current states of the main LSP and backup LSP; the control information of the main LSP and backup LSP is updated to the backup control module; and after the main control module and the backup control module are switched, the current main control module generates forward information according to the control information of the LSP of which identification information is active and performs service forwarding. The invention also discloses a system for realizing the method. By using the method and system of the invention, the switching and forwarding time is reduced and the service forwarding speed is increased.

The invention relates to a heavy-route strategy used for protecting and recovering a LSP path in the T-MPLS network, the mechanism provides a novel heavy-route protecting and recovering method used for quickly searching the path in the T-MPLS network, through a joint route and a signaling process, based on the detecting signal of a RSVP-TE signaling expand heavy-route, after the failure occurs, the detecting signal is flowed by adjacent nodes at the backward position of the failure, according to the forwarding strategy of each node and the decision rule, whether the node is an effective node on the protected LSP is judged, if the node is an effective node on the protected LSP, the establishing request of the heavy route path is performed, otherwise, the flowage is performed continuously. Through adopting the method, the protected path can be quickly searched after the failure of the network occurs, therefore, the bandwidth resource and the label resource in the T-MPLS network are saved, the interrupting time of traffic flow is greatly reduced, the recovering speed of the traffic flow is improved, the quick heavy-route and the protection and recovery of a traffic path is realized, and the demand of the real traffic is satisfied.

In one embodiment, a traffic engineering (TE) label switched path (LSP) is established between a head-end node in a local domain and a tail-end node in a remote domain. The TE-LSP spans one or more intervening domains located between the local domain and the remote domain. The head-end node sends a routing information request over the TE-LSP to a target node on the TE-LSP that is in the remote domain. The head end node receives routing information from the target node. The received routing information includes a list of address prefixes reachable by the target node. The head end node uses the received routing information to calculate routes reachable via the TE-LSP to the target node. The calculated routes have a next-hop interface set to be the TE-LSP. The calculated routes are inserted into a routing table of the head-end node.

The present invention discloses a solution which delivers routing systems with less path setup latency and causes them to be less susceptible to network loading, by providing them the ability to setup diverse paths as a result of specifying network resources to exclude as part of a path setup. The invention proposes an extension to RSVP-TE in the form of a new RSVP-TE object, known as an Exclude Route Object, which will allow, in a path setup request, the specification of a set of abstract nodes and resources to be explicitly excluded from the path. Additionally, the invention introduces a second type of exclusion which is achieved through a modification to the existing Explicit Route Object (ERO) by allowing a node to specify, in a path setup request, the exclusion of certain abstract nodes and resources between a specific pair of abstract nodes within an Explicit Route Object.

The present invention relates to a method and an arrangement for controlling the user plane of a UMTS Terrestrial Radio Access Network, UTRAN, comprising a first edge node connected via a Transport Network Layer to a second edge node, by using Transport Network Layer, TNL, signalling. A radio link is set up by using the Node B Application Part between the first and second edge nodes of the UTRAN, RSVP-TE based TNL signalling messages are transmitted between said first and second edge nodes for each TNL flow, and each TNL flow is identified by using RSVP-TE messages, wherein the object SESSION and SENDER_TEMPLATE comprises an IP based 5-tuple flow information, which is adapted to be used as a TNL flow identity.

A system and method for providing multi-topology support in RSVP-TE in a multi-protocol label switching network is provided. A method includes reserving path states for a traffic engineered label switched path (TE LSP), and releasing the reserved path states. The TE LSP is established within a single network topology in an environment of multiple network topologies, and the reserving path states includes sending a first resource reservation protocol with traffic engineering (RSVP-TE) message containing multi-topology information.

The invention discloses a tunnel establishment method, device and system, which are used for solving the problem that an RSVP-TE tunnel is adhered to or passes through an SR-TE tunnel in the prior art. The method comprises: a first network device receives a first request message sent by a previous hop network device, the first request message being used for requesting to obtain an RSVP-TE label ofthe first network device, the first network device supporting RSVP-TE and SR-TE, and the previous hop network device supporting RSVP-TE; when the first network equipment determines that at least onepiece of network equipment in downstream network equipment of the first network equipment supports SR-TE on the path of the to-be-built tunnel; an SR-TE tunnel from a first network device to a secondnetwork device of at least one network device is established, a tunnel identifier for identifying the SR-TE tunnel is generated, the first network device sends a first response message to a previous hop network device, and the first response message comprises the tunnel identifier.

The invention relates to a method for implementing bidirectional traffic engineering tunnel, and its kernel: as two routers each build a unidirectional tunnel between them, configuring bond objects in Resource reSerVation Protocol-Traffic Engineering (RSVP-TE) protocol; based on extension of the configured RSVP-TE protocol, binding the two unidirectional tunnels. By the built bidirectional tunnel, it can not only support all original service applications of RSVP-TE but flexibly and conveniently provide three-layer VPN services just like general routing enveloped (GRE) tunnel, where the VPN has enough bandwidth and TE attributes.