WO2009036628A1

WO2009036628A1 - A method of establishing lsp in mpls-te-based ngn

Info

Publication number: WO2009036628A1
Application number: PCT/CN2007/003677
Authority: WO
Inventors: Dingjun Li
Original assignee: Zte Corporation
Priority date: 2007-09-21
Filing date: 2007-12-19
Publication date: 2009-03-26
Also published as: CN101127718A; CN101127718B

Abstract

A method of establishing Label Switch Path in a Multi-Protocol Label Switching Traffic Engineering based Next Generation Network, comprises steps as follows. Step S202, network management system or network operating system sends a command of establishing a label switch path tunnel of multi-protocol label switching to a Transport Resource Control Function Entity of Resource Admission Control Function; step S204, after receiving the command, the Transport Resource Control Function Entity calculates paths and distributes network resource, and notifies the first node of the label switch path tunnel that the command indicates to establish to initiate a establishing signaling of label switch path tunnel; step S206, the first node sends the establishing signaling to the end node via one or more middle nodes, and the label switch path tunnel is established between the first node, one or more middle nodes, and the end node; and step S208, after the label switch path tunnel is established successfully, the end node sends a successful response to the first node via one or more middle nodes.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a label switching path in a Next Generation Network (NGN) based on Multi-Protocol Label Switched Traffic Engineering (MPLS-TE) ( The method of establishing LSP). BACKGROUND OF THE INVENTION Currently, there are already definitions of the ITU-NGN resource allocation and control function subsystem (ie, resource admission control function, RACF) (Y.RACF (Y.2111) standard) and multi-protocol label path traffic engineering (MPLS). -TE) The definition of RACF (Y.MPLS-RACF standard). Figure 1 shows the structure of the RACF based on the technology. In the structure shown in Figure 1, the following functional units are included: Transport Resource Enforcement Function Entity (TRE-FE), Policy Enforcement Function Entity (PE-FE), transmission The Resource Control Function Entity (TRC-FE), the Policy Decision Function Entit (PD-FE), and the Resource Admission Control Function (RACF). The functions of the various interfaces between the above functional units are as follows: The Rc interface is responsible for the collection of network topology and resource information of the Transport Functions and the collection of resource usage during the operation of the network; the Rs interface is responsible for the service control layer. (SCF) interacting with the Policy Decision Function Unit (PD-FE) of the Transport Network Control Layer (RACF) for service session abstract resource requests;

The Rt interface is responsible for the interaction of the policy decision function unit PD-FE and the transport network resource control function unit (TRC-FE) into the request and allocation of the session network resource;

The Ri interface is responsible for cross-domain communication between PD-FEs; the Rp interface is responsible for intra-domain communication between TRC-FEs. However, in the definition of RACF and the definition of RAC-based RACF, there is no specific definition of the process of multi-protocol label path label switching path (MPLS LSP) tunnel establishment and resource allocation, but only the RACF The Transport Resource Control Function Unit (TRC-FE) maintains network topology and resource information without describing the specific manner of static establishment and network resource allocation of MPLS LSP tunnels, which obviously hinders network operators from providing more abundant services to users, and Not conducive to the provision of broadband services. So far, no effective solution has been proposed for the above defects. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and for this reason, the main object of the present invention is to provide a method for establishing a label switching path in a next generation network based on label switching traffic engineering. There is a blank in this aspect of the standard. According to an embodiment of the present invention, a method for establishing a label switching path in a next generation network based on multi-protocol label switching traffic engineering is provided. The method includes: Step S202, network management system or network operation The dimension system sends a command to create a label switched path tunnel for the label switching exchange to the transmission resource control function unit of the resource admission control function; Step S204, the transmission resource control function unit performs path calculation and network resource allocation after receiving the command, and The notification command instructs the head node of the created label switched path tunnel to initiate establishment signaling of the label switched path tunnel; and in step S206, the head node sends signaling to the tail node via one or more intermediate nodes, at the head node, one or more Label switching path tunneling between intermediate nodes and tail nodes And in step S208, after the label switching path tunnel is successfully established, the tail node sends the successful response to the head node via one or more intermediate nodes. In step S202, the command to establish the label switched path tunnel includes the quality of service requirement. After the step S208, the method further includes: Step A, the head node feeds back to the transmission resource control function unit that the label switching path tunnel is successfully established; and in step B, the transmission resource control function unit feeds back label switching to the network management system or the network operation and maintenance system. The path tunnel is successfully established. After the step B, the method further includes: Step C: The network management system or the network operation and maintenance system sends, to the transmission resource control function unit, related information of the flow of the label switching path mapped to the label switching path tunnel; D, after the transmission resource control function unit receives the relevant information of the flow, The transmission resource execution function unit of the knowledge head node generates a mapping table entry of the flow and label switching path, and notifies the transmission resource execution function unit after the mapping table entry is successfully generated, and then notifies the network management system or the network operation and maintenance system by the transmission resource execution function unit. In addition, when the label switching path tunnel is removed, the following processing may be included: the network management system or the network operation and maintenance system sends a command to remove the label switching path tunnel to the transmission resource control function unit; the transmission resource control function unit notifies the head node to initiate the label switching path. Demolition signaling of the tunnel; the head node sends the teardown signaling to the tail node via one or more intermediate nodes, and removes the label switching path tunnel; after the label switching path tunnel is successfully removed, the tail node will remove the successful response via one or more The intermediate node sends the message to the head node; the head node feeds back the transmission resource control function unit to the removal success; and the transmission resource control function unit sends the feedback to the network management system or the network operation and maintenance system to be successfully removed. If the network management system or the network operation and maintenance system knows that the information about the flow of the label switching path exists in the label switching path tunnel, the following processing is further included: the network management system or the network operation and maintenance system transmits the resource. The control function unit sends the mapping cancellation information of the cancellation related information; after receiving the mapping cancellation information, the transmission resource control function unit instructs the transmission resource execution function unit to delete the mapping table entry of the flow and label switching path corresponding to the related information, and the deletion is successful. In the case, the success notification transmission resource control function unit will be deleted, and then the transmission resource control function unit will notify the network management system or the network operation and maintenance system of the deletion success. In addition, when the label switching path tunnel is adjusted, the following processing is further included: the network management system or the network operation and maintenance system sends a command for adjusting the label switching path tunnel to the transmission resource control function unit, and a new quality of service requirement; the transmission resource control function unit notification The transmitting resource execution function unit of the head node initiates the adjustment signaling of the label switching path tunnel; the head node sends the adjustment signaling to the tail node via one or more intermediate nodes, and adjusts the label switching path tunnel; after the label switching path tunnel is successfully adjusted The tail node sends the adjusted success response to the head node via one or more intermediate nodes; the head node feeds back the adjustment success to the transmission resource control function unit; and the transmission resource control function unit feeds back the adjustment to the network management system or the network operation and maintenance system; The way to adjust the label switching path tunnel includes: expansion and reduction. In addition, after the network management system or the network operation and maintenance system learns that the adjustment is successful, if the information about the flow that is mapped to the label switching path exists in the label switching path tunnel, the following processing is further included: the network management system or the network operation and maintenance system is adjusted. In a manner, a command for adding new related information or canceling the original related information is sent to the transmission resource control function unit; and the transmission resource control function unit instructs the transmission resource execution function unit to perform corresponding processing. At this time, when the network management system or the network operation and maintenance system sends a command to the transmission resource control function unit to instruct to add new related information, the transmission resource execution function unit generates a mapping table of the flow and label switching path corresponding to the newly added related information. entry. On the other hand, when the network management system or the network operation and maintenance system sends a command to the transmission resource control function unit to cancel the original related information, the transmission resource execution function unit deletes the mapping of the flow and the label exchange path corresponding to the original related information. Table entry. Through the above technical solution of the present invention, the blank of the label switching path establishment and resource allocation of the multi-protocol label switching in the existing standard is filled, which facilitates the development of multiple services and broadband services. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a block diagram of a RACF according to the related art; FIG. 2 is a flowchart of a method for establishing an LSP in an MPLS-TE based NGN according to an embodiment of the present invention; FIG. 4 is a signaling flowchart of removing an LSP tunnel in a method according to an embodiment of the present invention; and FIG. 5 is a signaling flowchart of adjusting an LSP tunnel in a method according to an embodiment of the present invention; . In the embodiment, a method for establishing an LSP (Label Switch Path) in an NGN based on MPLS-TE is provided, where a network management system (NMS) or a network operation and maintenance system (OSS), and a RACF are used. The network function units such as TRC-FE and TRE-FE implement the establishment, removal, and adjustment of static MPLS LSP tunnels, and the static allocation of network resources. In the method to be described below, the relevant command is initiated to the TRC-FE through the NMS or the OSS, and the TRC-FE responds to the relevant command according to the network topology and resource information that it has. And further instructing the TRE-FE in the transport network to complete the establishment, removal and adjustment of the relevant LSP. As shown in FIG. 2, the method for establishing an LSP in an MPLS-TE-based NGN according to this embodiment includes: Step S202: The NMS or the OSS sends a command for creating a multi-protocol label switching LSP tunnel to a TRC-FE of a resource admission control function. The command includes a quality of service (QoS) requirement (for example, bandwidth, etc.); Step S204, the TRC-FE performs path calculation and network resource allocation after receiving the command (optionally, at this time, calculating a path that satisfies the requirement, If the LSP of the LSP is created, the head node of the created LSP tunnel initiates the establishment of the LSP tunnel, and the path node can obtain the head node, one or more. Intermediate node, and tail node; step S206, the head node sends signaling to the tail node via one or more intermediate nodes, and establishes an LSP tunnel between the head node, one or more intermediate nodes, and the tail node; Step S208, after the LSP tunnel is successfully established, the tail node sends a successful response to the head node via one or more intermediate nodes. In addition, after step S208, the method further includes: Step A, the head node feeds back the LSP tunnel to the TRC-FE successfully; and in step B, the TRC-FE returns the LSP tunnel establishment success to the NMS or the OSS. Optionally, after step B, the method further includes: Step C: The NMS or the OSS sends related information of the flow of the LSP mapped to the LSP tunnel to the TRC-FE; and step D, after the TRC-FE receives the related information of the flow, Notifying the TRE-FE of the head node to generate a mapping table entry of the flow and the LSP, and notifying the TRE-FE after the mapping table entry is successfully generated, and then notifying the NMS or the OSS by the TRE-FE; FIG. 3 shows the signaling flow of the above processing. . As shown in FIG. 3, the following processing is included: Step 31: The NMS or the OSS actively sends a command to create an MPLS LSP tunnel to the TRC-FE of the RACF to notify the corresponding QoS requirement. Step 32: After receiving the command, the TRC-FE performs the command. Path calculation and network resource allocation. After the calculation is completed, the TRC-FE sends a command to the TRE-FE of the LSP tunnel head node to indicate (explicitly or loosely indicate) the LSP tunnel establishment signaling of the originating transport network; Step 33, After receiving the command, the TRE-FE of the node initiates LSP establishment signaling to the TRE-FE of the subsequent node, and waits for a response. When the entire LSP tunnel is established, the head node receives the success response of the subsequent node, and then feeds back to the TRC-FE. Success information; Step 34, the TRC-FE feeds back the success information to the NMS or the OSS; Step 35: The NMS or the OSS may continue to send related information of the flow mapped to the LSP to the TRC-FE. Step 36: After receiving the flow mapping information, the TRC-FE instructs the TRE-FE of the LSP head node to generate a corresponding flow. LSP mapping table entry; Step 37: The TRE-FE generates a corresponding flow-LSP mapping table entry according to the indication of the TRC-FE, and feeds back a success message; Step 38, the TRC-FE feeds back the success message to the NMS/OSS. Among them, step 35 to step 38 are optional steps. In addition, when the LSP tunnel is removed, the following processing may be included: the NMS or the OSS sends a command to remove the LSP tunnel to the TRC-FE; the TRC-FE notifies the head node to initiate the teardown signaling of the LSP tunnel; the head node will tear down the signaling via one or Multiple intermediate nodes are sent to the tail node to remove the LSP tunnel. After the LSP tunnel is successfully removed, the tail node sends the teardown success response to the head node via one or more intermediate nodes; the header node is successfully removed from the TRC-FE feedback; and the TRC The feedback of the -FE to the NMS or OSS was successfully removed. After the NMS or the OSS knows that the detachment is successful, if the LSP tunnel is mapped to

The information about the flow of the LSP further includes the following processing: the NMS or the OSS sends the mapping cancellation information of the cancellation related information to the TRC-FE; after receiving the mapping cancellation information, the TRC-FE instructs the TRE-FE to delete the flow corresponding to the related information. The mapping table entry with the LSP will notify the TRC-FE of the deletion success if the deletion is successful, and then notify the NMS or OSS of the deletion success by the TRC-FE. The signaling flow for tearing down the LSP tunnel is shown in FIG. As shown in FIG. 4, the following process is specifically included: Step 41: The NMS or the OSS actively sends a command to remove the MPLS LSP tunnel to the TRC-FE of the RACF. Step 42: After receiving the command, the TRC-FE sends the command to the LSP tunnel head node. The TRE-FE sends a command to instruct the LSP tunnel teardown signaling of the transport network to be initiated; Step 43: After receiving the command, the TRE-FE of the head node initiates LSP teardown signaling to the subsequent node, and waits for a response; Step 44: After the entire LSP tunnel is removed, the head node receives the successful response of the subsequent node, and feeds back the information to the TRC-FE for successful removal; Step 45, the TRC-FE feeds back the success information to the NMS or the OSS; Step 46, The NMS or the OSS may continue to send information related to the flow that is unmapped to the LSP to the TRC-FE. Step 47: After receiving the flow mapping cancellation information, the TRC-FE instructs the TRE-FE of the LSP head node to delete the corresponding flow-LSP. Map table entries. Step 48: The TRE-FE deletes the corresponding flow-LSP mapping table entry according to the indication of the TRC-FE, and feeds back the success message. In step 49, the TRC-FE feeds back the success message to the NMS/OSS. Wherein, step 46 to step 49 are optional steps. In addition, when the LSP tunnel is adjusted, the following processing is further included: the NMS or the OSS sends a command to adjust the LSP tunnel to the TRC-FE, and a new quality of service request; the TRC-FE notifies the TRE-FE of the head node to initiate an adjustment signal of the LSP tunnel. The head node adjusts the signaling to the tail node via one or more intermediate nodes to adjust the LSP tunnel; after the LSP tunnel is successfully adjusted, the tail node sends the adjusted success response to the head node via one or more intermediate nodes; The feedback adjustment of the node to the TRC-FE is successful; and the feedback adjustment of the TRC-FE to the NMS or the OSS is successful; wherein the manner of adjusting the LSP tunnel includes: expansion and reduction. And, after the NMS or the OSS knows that the adjustment is successful, if there is related information of the flow mapped to the LSP in the LSP tunnel, the following processing is further included: the NMS or the OSS sends an indication to the TRC-FE to add a new correlation according to the adjusted manner. The information, or the command to cancel the original related information; and the TRC-FE instructs the TRE-FE to proceed accordingly. At this time, when the NMS or the OSS sends a command to the TRC-FE to add new related information, the TRE-FE generates a mapping table entry of the flow and the LSP corresponding to the newly added related information. On the other hand, when the NMS or the OSS sends a command to the TRC-FE to cancel the original related information, the TRE-FE deletes the mapping table entry of the flow and the LSP corresponding to the original related information. The signaling flow for adjusting the LSP tunnel is shown in FIG. As shown in FIG. 5, the following specifically includes: Step 51: The NMS or the OSS sends an MPLS LSP tunnel adjustment command to the RAC-FE of the RACF to notify the new QoS requirement, such as the bandwidth. Step 52: After the TRC-FE receives the command, if the command is to expand the LSP tunnel, Then perform path calculation and network resource allocation. After the calculation is complete, the TRC-FE sends a command to the TRE-FE of the LSP tunnel head node to instruct it to initiate the LSP tunnel adjustment signaling of the transport network. Step 53: After receiving the command, the TRE-FE of the head node initiates an LSP to the subsequent node. Adjusting the signaling and waiting for the response; Step 54: After completing the adjustment of the entire LSP tunnel, the head node receives the success response of the subsequent node, and returns the success information to the TRC-FE; Step 55, the TRC-FE feeds back to the NMS or the OSS again. Success information; Step 56, the NMS or the OSS may continue to send information about the flow added/unmapped to the LSP to the TRC-FE; Step 57, after receiving the flow map addition/cancellation information, the TRC-FE instructs the LSP head node The TRE-FE generates/deletes the corresponding stream-LSP mapping table. Step 58: The TRE-FE generates/deletes the corresponding stream-LSP mapping table entry according to the indication of the TRC-FE, and feeds back the success message; Step 59, The TRC-FE then feeds back the success message to the NMS/OSS. Among them, step 56 to step 59 are optional steps. In summary, the technical solution of the present invention fills in the blank of the existing standard for defining the LSP tunnel establishment mechanism in the MPLS-TE based NGN network; the static MPLS LSP tunnel establishment mechanism according to the present invention is very suitable In the future, the network operator provides the VPN service to the user in the NGN network, and is applicable to the scenario where the backbone network operator provides the network bandwidth service to other network operators. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for establishing a label switching path in a next generation network based on multi-protocol label switching traffic engineering, comprising:

Step S202: The network management system or the network operation and maintenance system sends a command for creating a label switching path tunnel of the multi-protocol label switching to the transmission resource control function unit of the resource admission control function.

Step S204, the transmission resource control function unit performs path calculation and network resource allocation after receiving the command, and notifies the command that the head node of the label switching path tunnel that is created initiates the establishment signaling of the label switching path tunnel. ;

Step S206, the head node sends the establishment signaling to the tail node via one or more intermediate nodes, and establishes the relationship between the head node, the one or more intermediate nodes, and the tail node. Label switched path tunnel;

Step S208: After the label switching path tunnel is successfully established, the tail node sends a success response to the head node via the one or more intermediate nodes.

The method according to claim 1, wherein in the step 8202, the command to establish the label switched path tunnel includes a quality of service requirement.

The method according to claim 1, wherein after the step S208, the method further comprises:

Step A: The head node feeds back to the transport resource control function unit that the label switching path tunnel is successfully established;

Step B: The transmission resource control function unit feeds back to the network management system or the network operation and maintenance system that the label switching path tunnel is successfully established.

The method according to claim 3, after the step B, further comprising:

Step C: The network management system or network operation and maintenance system sends, to the transmission resource control function unit, related information of a flow that is mapped to a label switching path of the label switching path tunnel; Step D: After receiving the related information of the flow, the transmission resource control function unit notifies the transmission resource execution function unit of the head node to generate a mapping table entry of the flow and the label switching path, and in the After the mapping table entry is successfully generated, the transmitting resource execution function unit is notified, and then the transmitting resource execution function unit notifies the network management system or the network operation and maintenance system;

The method according to any one of claims 1 to 4, wherein when the label switching path tunnel is removed, the following processing is included:

Sending, by the network management system or the network operation and maintenance system, the command for removing the label switching path tunnel to the transmission resource control function unit;

The transmission resource control function unit notifies the head node to initiate teardown signaling of the label switched path tunnel;

Sending, by the head node, the teardown signaling to the tail node via the one or more intermediate nodes, and removing the label switching path tunnel;

After the label switching path tunnel is successfully removed, the tail node sends a teardown success response to the head node via the one or more intermediate nodes;

The header node feeds back the successful removal to the transmission resource control function unit; and the transmission resource control function unit feeds back the network management system or the network operation and maintenance system.

The method according to claim 5, wherein, after the network management system or the network operation and maintenance system knows that the removal is successful, if there is information about a flow mapped to the label switching path in the label switching path tunnel , then further includes the following processing:

Sending, by the network management system or the network operation and maintenance system, the mapping cancellation information of the related information to the transmission resource control function unit;

After receiving the mapping cancellation information, the transmission resource control function unit instructs the transmission resource execution function unit to delete the mapping table entry of the flow and the label switching path corresponding to the related information, and the deletion is successful. In the case, the transmission resource control function unit is successfully deleted, and the transmission resource control function unit notifies the network management system or the network operation and maintenance system of the deletion success.

7. The method according to any one of claims 1 to 4, characterized in that, when adjusting the label switching path tunnel, the following processing is further included:

Transmitting, by the network management system or the network operation and maintenance system, a command for adjusting the label switching path tunnel and a new quality of service requirement to the transmission resource control function unit;

The transmission resource control function unit notifying the transmission resource execution function unit of the head node to initiate adjustment signaling of the label switching path tunnel;

Transmitting, by the head node, the adjustment signaling to the tail node via the one or more intermediate nodes, and adjusting the label switching path tunnel;

After the label switching path tunnel is successfully adjusted, the tail node sends an adjustment success response to the head node via the one or more intermediate nodes;

The head node feeds back the adjustment success to the transmission resource control function unit; and the transmission resource control function unit feeds back the adjustment to the network management system or the network operation and maintenance system successfully;

The manner of adjusting the label switching path tunnel includes: expanding and reducing.

The method according to claim 7, wherein, after the network management system or the network operation and maintenance system knows that the adjustment is successful, if there is related information of the flow mapped to the label switching path in the label switching path tunnel , then further includes the following processing:

And the network management system or the network operation and maintenance system sends a command to the transmission resource control function unit to add new related information or cancel the original related information according to the adjusted manner;

The transmission resource control function unit instructs the transmission resource execution function unit to perform corresponding processing.

The method according to claim 8, wherein when the network management system or the network operation and maintenance system sends a command to the transmission resource control function unit to add new related information, the transmission resource execution function The unit generates a mapping table entry of the flow and label switching path corresponding to the newly added related information.

The method according to claim 8, wherein when the network management system or the network operation and maintenance system sends a command to the transmission resource control function unit to cancel the original related information, the transmission resource The execution function unit deletes the mapping table entry of the flow and label switching path corresponding to the original related information.