WO2015184848A1

WO2015184848A1 - Method and apparatus for creating label switched path (lsp)

Info

Publication number: WO2015184848A1
Application number: PCT/CN2015/072328
Authority: WO
Inventors: 祝沈财; 袁仁状
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-10-20
Filing date: 2015-02-05
Publication date: 2015-12-10
Also published as: CN105591861A

Abstract

A method and apparatus for creating an LSP, which relates to the technical field of communications and is used for solving the problem in a related art that a protection tunnel cannot be established for a tunnel that is triggered to be established and the stability of communication between nodes is low in a case in which a PCE actively triggers to establish the tunnel. The creation method comprises: a PCE sends an LSP initialization message to a first node of a tunnel, the LSP initialization message carrying main channel information and a protection tunnel indication parameter so that each node in the main channel acquires the protection tunnel indication parameter; and the path computation element (PCE) determines a protection tunnel for each corresponding node according to a feedback made by each node in the main tunnel to the protection tunnel indication parameter.

Description

Method and device for creating label switching path LSP

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for creating a label switched path LSP.

Background technique

A PCE (Path Computation Element) is a device or a number of computing devices deployed in a network domain, which is specifically used to calculate the path for nodes in the network. A PCC (Path Computation Customer) is provided in the module that needs to calculate the path in the network. The PCE protocol (PCE protocol) can send a calculation request message to the PCE and receive the calculation result calculated by the PCE. The RSVP (Resource Reservation Protocol) signaling process is initiated according to the result of the calculation.

In addition to the path calculation based on the request of the PCC, the PCE can also actively trigger the establishment of an LSP (label switch path) between some network nodes as needed. For example, when an application needs to create a tunnel with a specific constraint, or the bandwidth of the related tunnel is insufficient, and a new tunnel needs to be created for load sharing, the PCE needs to establish a corresponding tunnel.

However, in the case that the PCE actively triggers the establishment of a tunnel, the related art cannot establish a protection tunnel for the tunnel that triggers the establishment. In view of the fact that a single node failure in the network is relatively common, if the mechanism for protecting the tunnel is not established, the stability of communication between nodes will be greatly reduced.

Summary of the invention

The embodiment of the present invention provides a method and a device for creating an LSP, which are used to solve the problem that the PCE (Path Computation Element) actively triggers the establishment of a tunnel, and cannot establish a corresponding protection tunnel for the tunnel that is triggered to be established. The problem of low stability of communication between nodes.

To solve the above technical problem, in one aspect, the embodiment of the present invention provides a method for creating an LSP, including: the PCE sends an LSP initialization message to the tunnel head node to make each node in the primary tunnel learn the protection tunnel indication parameter, The LSP initialization message carries the primary tunnel information and the protection tunnel The channel indication parameter; the computing element PCE determines a protection tunnel for each corresponding node according to feedback of the protection tunnel indication parameter by each node in the primary tunnel.

Optionally, the PCE determines, according to the feedback of the protection tunnel indication parameter by each node in the primary tunnel, determining a protection tunnel for each corresponding node, where the PCE receives each of the primary tunnels. The protection tunnel calculation request of the node; the PCE determines a protection tunnel for each node according to the protection tunnel calculation request, and sends the determined protection tunnel information to each corresponding node.

Optionally, the protection tunnel indication parameter includes a protection tunnel type.

Optionally, the protection tunnel type includes a detour DETOUR fast reroute or a device FACILITY fast reroute.

To solve the above technical problem, on the other hand, the embodiment of the present invention further provides a method for creating an LSP, including: a tunnel head node receives an LSP initialization message from a PCE, where the LSP initialization message carries the primary tunnel information and the protection tunnel. Instructing a parameter; the tunnel head node creates a primary tunnel according to the LSP initialization message, and sends the protection tunnel indication parameter to each of the other nodes in the primary tunnel; each node in the primary tunnel according to the The protection tunnel indicates that the parameter establishes a corresponding protection tunnel.

Optionally, the tunnel head node creates a primary tunnel according to the LSP initialization message, and sends the protection tunnel indication parameter to each of the other nodes in the primary tunnel, where the tunnel head node is initialized according to the LSP. The message initiates RSVP signaling to create a primary tunnel, and the RSVP signaling carries the protection tunnel indication parameter.

Optionally, each node in the primary tunnel establishes a corresponding protection tunnel according to the protection tunnel indication parameter, where each node in the primary tunnel sends a protection tunnel to the PCE according to the protection tunnel indication parameter. Calculating a path request; each node in the primary tunnel receives protection tunnel information from the PCE and establishes a corresponding protection tunnel according to the protection tunnel information.

To solve the above technical problem, on the other hand, the embodiment of the present invention further provides an apparatus for creating an LSP, including: a sending unit, configured to enable each node in the primary tunnel to learn a protection tunnel by sending an LSP initialization message to the tunnel head node. Instructing the parameter, the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter, and the determining unit is set to be according to each section in the primary tunnel Pointing feedback to the protection tunnel indication parameter determines a protection tunnel for each corresponding node.

Optionally, the determining unit is configured to: receive a protection tunnel calculation request from each node in the primary tunnel; determine, according to the protection tunnel calculation request, a protection tunnel for each node The corresponding nodes send the determined protection tunnel information.

To solve the above technical problem, on the other hand, the embodiment of the present invention further provides an apparatus for creating an LSP, comprising: a receiving unit, configured to receive an LSP initialization message from a PCE, where the LSP initialization message carries the primary tunnel information and protection a tunnel indication parameter, the primary tunnel creation unit, configured to create a primary tunnel according to the LSP initialization message received by the receiving unit, and send the protection tunnel indication parameter to each of the other nodes in the primary tunnel; And the unit is configured to establish, according to the protection tunnel indication parameter sent by the primary tunnel creation unit, a corresponding protection tunnel for each node in the primary tunnel.

Optionally, the primary tunnel creation unit is configured to create a primary tunnel according to the LSP initialization message initiation resource reservation protocol RSVP signaling, where the RSVP signaling carries the protection tunnel indication parameter.

Optionally, the protection tunnel creation unit is configured to enable each node in the primary tunnel to send a protection tunnel calculation request to the computing element PCE according to the protection tunnel indication parameter; causing each of the primary tunnels The node receives the protection tunnel information from the computing element PCE and establishes a corresponding protection tunnel according to the protection tunnel information.

In order to solve the above technical problem, an embodiment of the present invention further provides a computer program, including program instructions, which can be implemented when the program instructions are executed.

In order to solve the above technical problem, an embodiment of the present invention further provides a carrier carrying the computer program.

The method and device for creating an LSP according to the embodiment of the present invention, when the PCE is to actively establish an LSP between two nodes, may send an LSP initialization message to the tunnel first node, and carry the primary tunnel information and protection in the LSP initialization message. The tunnel indicates the parameter, so that each node in the primary tunnel can learn the corresponding protection tunnel indication parameter and provide corresponding feedback to the protection tunnel indication parameter. Therefore, the PCE can determine a corresponding protection tunnel for each corresponding node according to the feedback, thereby effectively improving the stability of communication between the nodes.

BRIEF abstract

FIG. 1 is a flowchart of a method for creating an LSP according to an embodiment of the present invention;

2 is another flowchart of a method for creating an LSP according to an embodiment of the present invention;

3 is a detailed flowchart of a method for creating an LSP provided by an application example of the present invention;

4 is a schematic diagram of a data structure of a protection tunnel indication parameter in an application example of the present invention;

FIG. 5 is a schematic structural diagram of an apparatus for creating an LSP according to an embodiment of the present disclosure;

FIG. 6 is another schematic structural diagram of an apparatus for creating an LSP according to an embodiment of the present invention.

Preferred embodiment of the invention

The embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the alternative embodiments described herein are merely illustrative of the invention and are not limiting of the invention.

As shown in FIG. 1 , an embodiment of the present invention provides a method for creating a label switched path LSP, including:

S11, the PCE sends the LSP initialization message to the tunnel head node to enable the node in the primary tunnel to learn the protection tunnel indication parameter, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter.

S12. The PCE determines a protection tunnel for each corresponding node according to feedback of the protection tunnel indication parameter by each node in the primary tunnel.

The method for creating an LSP according to the embodiment of the present invention, when the PCE is to actively establish an LSP between two nodes, may send an LSP initialization message to the tunnel first node, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication. a parameter, so that each node in the primary tunnel can learn the corresponding protection tunnel indication parameter and provide corresponding feedback to the protection tunnel indication parameter, so that the PCE can determine a corresponding protection tunnel for each corresponding node according to the feedback. , effectively improve the stability of communication between nodes.

It should be noted that the embodiments of the present invention relate to two protocols, PCEP and RSVP, and the transmission paths between nodes have different names in the two protocols. For example, it is called LSP in PCEP and tunnel in RSVP, but it is essentially the same.

Optionally, in step S11, when the PCE needs to create a new tunnel between the two nodes, first calculate a primary tunnel between the two nodes, and send the primary tunnel information to the tunnel first node. If the node on the primary tunnel needs to be quickly rerouted when the primary tunnel fails, the protection tunnel indication parameter may be added to the primary tunnel information, and the primary tunnel information and the protection tunnel indication parameter are carried in the LSP initialization message. In order to make each node in the primary tunnel aware that it needs to establish a corresponding protection tunnel.

Optionally, the LSP initialization message sent by the PCE to the tunnel head node may be a PCInitiate message. Since the data is in the form of TLV (TYPE LENGTH VALUE, type, length, value) in the PCInitiate message, the newly added protection tunnel indication parameter in this embodiment also conforms to such a TLV form. Wherein, the type may be assigned a value that has not been defined in the PCInitiate message, such as TYPE=22, and the length value indicates the total number of bytes occupied by the TLV form protection tunnel indication parameter, optionally, LENGTH=4 And VALUE can record the content of the protection tunnel indication parameter. In one embodiment of the invention, VALUE can be represented as a 32-bit Flag, each of which can be used to indicate a type of protection tunnel. . For example, if one of the bits represents DETOUR (fast reroute), when this bit is set to 1, it means that each node in the primary tunnel needs to establish the fast reroute protection of DETOUR mode. When this bit is cleared to 0, it means that each node in the primary tunnel does not need to establish fast reroute protection in DETOUR mode. Other types of protection tunnels such as FACILITY (relay) are similar, and will not be explained here. When the 32-bit flag is all cleared to 0, it means that each node in the primary tunnel does not need to establish a protection tunnel.

Optionally, in step S12, the computing element PCE determines, according to feedback of the protection tunnel indication parameter by each node in the primary tunnel, determining a protection tunnel for each corresponding node, including:

The computing element PCE receives a protection tunnel calculation request from each node in the primary tunnel;

The computing element PCE determines a protection tunnel for each node according to the protection tunnel computing request and sends the determined protection tunnel information to each corresponding node.

That is to say, the protection tunnel indication parameter only indicates that each node in the primary tunnel needs to establish a protection tunnel, but the path selection and establishment of the protection tunnel is to send a protection tunnel calculation request message to the PCE through each node in the primary tunnel. To start. Optionally, multiple path constraints may be carried in the protection tunnel calculation request message, and the PCE may calculate a corresponding protection tunnel according to the constraints.

Correspondingly, the embodiment of the present invention further provides a method for creating a label switched path LSP. As shown in FIG. 2, the method includes:

S21, the tunnel head node receives an LSP initialization message from the PCE, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter.

S22. The tunnel head node creates a primary tunnel according to the LSP initialization message, and sends the protection tunnel indication parameter to each of the other nodes in the primary tunnel.

S23. Each node in the primary tunnel establishes a corresponding protection tunnel according to the protection tunnel indication parameter.

In the LSP creation method provided by the embodiment of the present invention, the tunnel head node can receive the LSP initialization message from the PCE, create a primary tunnel according to the primary tunnel information in the LSP initialization message, and send an LSP initialization message to each of the other nodes in the primary tunnel. The protection tunnel carries the indication parameters, so that each node in the primary tunnel can establish a corresponding protection tunnel according to the protection tunnel indication parameter, thereby effectively improving the stability of communication between the nodes.

It should be noted that, in each node of the primary tunnel, a PCC (Path Computation Customer) is provided, and the computing request message and the receiving PCE calculation can be sent to the PCE through the PCEP (PCE protocol, PCE protocol). The calculation result is obtained, and the RSVP signaling process is initiated according to the calculation result. The communication between each node and the PCE is essentially the communication between the PCC and the PCE in each node.

Optionally, in step S21, the LSP initialization message received by the tunnel master node from the PCE may be a PCInitiate message. Since the data in the PCInitiate message exists in the form of TLV (TYPE LENGTH VALUE, type, length, value), the protection tunnel indication parameter in this embodiment also conforms to such a TLV form. Wherein, the type may be assigned a value that has not been defined in the PCInitiate message, such as TYPE=22, and the length value indicates the total number of bytes occupied by the TLV form protection tunnel indication parameter, such as LENGTH=4, and VALUE Can Record the contents of the protection tunnel indication parameters. In one embodiment of the invention, VALUE can be represented as a 32-bit Flag, each of which can be used to indicate a type of protection tunnel. For example, one of the bits can be quickly rerouted on behalf of DETOUR. When this bit is set to 1, it indicates that each node in the primary tunnel needs to establish fast reroute protection in DETOUR mode. When this bit is cleared to 0, it indicates the main Each node in the tunnel does not need to establish fast reroute protection in the DETOUR mode. Other types of protection tunnels such as FACILITY fast reroute are similar and will not be explained here. When the 32-bit flag is all cleared to 0, it means that each node in the primary tunnel does not need to establish a protection tunnel.

In step S22, the tunnel head node first creates a primary tunnel according to the primary tunnel information in the LSP initialization message, and sends a protection tunnel indication parameter carried in the LSP initialization message to each of the other nodes in the primary tunnel. Optionally, this process can be implemented by using RSVP signaling. That is, the tunnel head node may initiate RSVP signaling according to the LSP initialization message to create a corresponding primary tunnel, and carry the protection tunnel indication parameter in the RSVP signaling, so that each of the other nodes in the primary tunnel can know whether it is A protection tunnel needs to be established and what type of protection tunnel is established.

Optionally, in step S23, each node in the primary tunnel establishes a corresponding protection tunnel according to the protection tunnel indication parameter, including:

Each node in the primary tunnel sends a protection tunnel calculation request to the computing element PCE according to the protection tunnel indication parameter;

Each node in the primary tunnel receives protection tunnel information from the computing element PCE and establishes a corresponding protection tunnel according to the protection tunnel information.

That is to say, when each node in the primary tunnel learns its corresponding protection tunnel indication parameter, it can only know whether it needs to establish a protection tunnel or establish a type of protection tunnel, but the path selection and establishment of the protection tunnel is passed. Each node in the primary tunnel sends a protection tunnel calculation request message to the PCE to start. Optionally, multiple path constraints may be carried in the protection tunnel calculation request message, so that the PCE calculates a corresponding protection tunnel according to the constraints. Optionally, the PCE may send the calculated protection tunnel information to each corresponding node, and each corresponding node may establish a corresponding protection tunnel according to the protection tunnel information.

The LSP creation method provided by the embodiment of the present invention is described in detail below by using an application example. As shown in FIG. 3, in this application example, the PCE establishes a tunnel between node A and node D according to requirements, and calculates a path A-B-D, where A is the tunnel head node. Simultaneous upper application It is hoped that this tunnel between ADs has DETOUR mode FRR protection.

101. The PCE sends a PCInitiate message to the PCC residing at the Node A, carrying information such as the tunnel head and tail node and the path. Add the FRR attribute TLV to the LSP object at the same time. The data structure of the TLV is shown in Figure 4, where the D bit in the TLV is set to 1 to indicate that DETOUR protection is required.

102. The node A initiates RSVP signaling to create a path through the ABD according to the PCInitiate message received by the PCC. The A-node finds that the LSP has the DETOUR protection in the FRR attribute TLV, and therefore carries the DETOUR protection related information in the RSVP signaling.

After the RSVP signaling establishes the primary tunnel, the Node B finds that the signaling needs to establish a DETOUR protection tunnel. Therefore, the Node B initiates a path request for the protection tunnel to the PCE through the locally resident PCC, and the request carries multiple calculation paths. Restrictions.

104. The PCE node calculates the DETOUR protection tunnel through the BCD node according to the constraint condition in the calculation path request, and returns the calculation result to the PCC where the Node B resides.

105. Based on the calculation result of the protection tunnel, the Node B establishes a protection path through the BCD node by using RSVP signaling. After the protection tunnel is established, the primary tunnel and the protection tunnel are associated at the Node B. In this way, when the main path of the Node B is abnormal, the FRR protection will work to ensure fast traffic switching, which effectively improves the stability of communication between nodes.

It should be noted that when the A-node establishes the primary tunnel and finds that the signaling information needs to form the DETOUR protection, it will try to calculate the protection path by sending the protection tunnel calculation request message as the Node B. However, since there is only one path from the A node to the B node, there is no protection tunnel, and the calculation result fails, so the FRET protection in the form of DETOUR is not formed.

This article gives an example of DETOUR protection. The FACILITY mode FRR protection formation steps are basically the same. The difference is that the protection tunnel is created in advance. When the primary tunnel is formed, the protection node finds that the tunnel needs FRC protection in the form of FACILITY. Then, it can find a protection tunnel in the relevant tunnel to form an FRR protection relationship. If not, the FRR protection is not found. The formation failed.

Correspondingly, as shown in FIG. 5, an embodiment of the present invention further provides an LSP creation apparatus 3, including:

The sending unit 30 is configured to enable the node in the primary tunnel to learn the protection tunnel indication parameter by sending an LSP initialization message to the tunnel head node, where the LSP initialization message carries the primary tunnel Information and protection tunnel indication parameters;

The determining unit 32 is configured to determine a protection tunnel for each corresponding node according to feedback of the protection tunnel indication parameter by each node in the primary tunnel.

In the LSP creation apparatus 3 provided by the embodiment of the present invention, when the PCE is to actively establish an LSP (that is, a tunnel) between two nodes, the sending unit 30 may send an LSP initialization message to the tunnel head node, in the LSP initialization message. Carrying the primary tunnel information and the protection tunnel indication parameter, so that each node in the primary tunnel can obtain the corresponding protection tunnel indication parameter and provide corresponding feedback to the protection tunnel indication parameter, so that the determining unit 32 can respond to the feedback. A corresponding protection tunnel is determined for each corresponding node, which effectively improves the stability of communication between nodes.

Optionally, the determining unit 32 is configured to:

Receiving a protection tunnel calculation request from each node in the primary tunnel;

And determining, according to the protection tunnel calculation request, a protection tunnel for each node and transmitting the determined protection tunnel information to each corresponding node.

Optionally, the protection tunnel indication parameter includes a protection tunnel type, where the protection tunnel type includes DETOUR fast reroute or FACILITY fast reroute.

Correspondingly, as shown in FIG. 6, the embodiment of the present invention further provides a label switching path LSP creation apparatus 4, including:

The receiving unit 40 is configured to receive an LSP initialization message from the computing element PCE, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter;

The primary tunnel creation unit 42 is configured to: according to the LSP initialization message received by the receiving unit 40, create a primary tunnel and send the protection tunnel indication parameter to each node in the primary tunnel;

The protection tunnel creation unit 44 is configured to establish a corresponding protection tunnel for the primary tunnel node according to the protection tunnel indication parameter sent by the primary tunnel creation unit 42.

In the LSP creating apparatus 4 provided by the embodiment of the present invention, the tunnel head node receiving unit 40 can receive the LSP initialization message from the PCE, and the main tunnel creating unit 42 can create a main tunnel according to the primary tunnel information in the LSP initialization message and to the main tunnel. Each of the nodes sends the protection tunnel indication parameter carried in the LSP initialization message, so that the protection tunnel creation unit 44 can establish a corresponding protection tunnel for each node in the primary tunnel, thereby effectively improving the stability of communication between the nodes.

Optionally, the primary tunnel creation unit 42 is configured to create a primary tunnel by initiating RSVP signaling according to the LSP initialization message, where the RSVP signaling carries the protection tunnel indication parameter.

Optionally, the protection tunnel creation unit 44 is configured to

And causing each node in the primary tunnel to send a protection tunnel calculation request to the computing element PCE according to the protection tunnel indication parameter;

Although alternative embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are also possible, and thus the scope of the invention should not be limited to the embodiments described above.

One of ordinary skill in the art will appreciate that all or a portion of the steps described above can be accomplished by a program that instructs the associated hardware, such as a read-only memory, a magnetic or optical disk, and the like. Optionally, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits. Accordingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented by using a software function module. Formal realization. The invention is not limited to any specific form of combination of hardware and software.

Industrial applicability

The foregoing technical solution enables the PCE to determine a corresponding protection tunnel for each corresponding node according to the feedback, thereby effectively improving the stability of communication between the nodes.

Claims

A method for creating a label switched path LSP includes:

The computing element PCE sends the LSP initialization message to the tunnel head node to learn the protection tunnel indication parameter for each node in the primary tunnel, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter.

The computing element PCE determines a protection tunnel for each corresponding node according to feedback of the protection tunnel indication parameter by each node in the primary tunnel.
The method according to claim 1, wherein the computing element PCE determines, according to the feedback of the protection tunnel indication parameter by each node in the primary tunnel, determining a protection tunnel for each corresponding node, including:

The computing element PCE receives a protection tunnel calculation request from each node in the primary tunnel;

The computing element PCE determines a protection tunnel for each node according to the protection tunnel computing request and sends the determined protection tunnel information to each corresponding node.
The method of claim 1 wherein the protection tunnel indication parameter comprises a protection tunnel type.
The method of claim 3, wherein the protection tunnel type comprises a detour DETOUR fast reroute or a device FACILITY fast reroute.
A method for creating a label switched path LSP includes:

The tunnel head node receives an LSP initialization message from the computing element PCE, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter;

The tunnel head node creates a primary tunnel according to the LSP initialization message, and sends the protection tunnel indication parameter to each of the other nodes in the primary tunnel;

Each node in the primary tunnel establishes a corresponding protection tunnel according to the protection tunnel indication parameter.
The method according to claim 5, wherein the tunnel head node creates a primary tunnel according to the LSP initialization message, and sends the protection tunnel to each of the other nodes in the primary tunnel. The channel indication parameters include:

The tunneling node initiates a resource reservation protocol RSVP signaling to create a primary tunnel according to the LSP initialization message, and the resource reservation protocol RSVP signaling carries the protection tunnel indication parameter.
The method according to claim 5, wherein each node in the primary tunnel establishes a corresponding protection tunnel according to the protection tunnel indication parameter, including:

Each node in the primary tunnel sends a protection tunnel calculation request to the computing element PCE according to the protection tunnel indication parameter;

Each node in the primary tunnel receives protection tunnel information from the computing element PCE and establishes a corresponding protection tunnel according to the protection tunnel information.
A device for creating a label switched path LSP, including:

a sending unit, configured to: send, by sending an LSP initialization message to the tunnel head node, the node in the primary tunnel to learn the protection tunnel indication parameter, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter;

And a determining unit, configured to determine a protection tunnel for each corresponding node according to feedback of the protection tunnel indication parameter by each node in the primary tunnel.
The apparatus according to claim 8, wherein said determining unit is configured to:

Receiving a protection tunnel calculation request from each node in the primary tunnel;

And determining, according to the protection tunnel calculation request, a protection tunnel for each node and transmitting the determined protection tunnel information to each corresponding node.
A device for creating a label switched path LSP, including:

a receiving unit, configured to receive an LSP initialization message from the computing element PCE, where the LSP initialization message carries the primary tunnel information and the protection tunnel indication parameter;

a primary tunnel creation unit, configured to create a primary tunnel according to the LSP initialization message received by the receiving unit, and send the protection tunnel indication parameter to each node in the primary tunnel;

The protection tunnel creation unit is configured to establish a corresponding protection tunnel for each node in the primary tunnel according to the protection tunnel indication parameter sent by the primary tunnel creation unit.
The creating device according to claim 10, wherein

The primary tunnel creation unit is configured to create a primary tunnel according to the LSP initialization message initiation resource reservation protocol RSVP signaling, where the RSVP signaling carries the protection tunnel indication parameter.
The creating device according to claim 10, wherein

a protection tunnel creation unit configured to cause each node in the primary tunnel to send a protection tunnel calculation request to the calculation element PCE according to the protection tunnel indication parameter; and each node in the primary tunnel receives the source from the The protection tunnel information of the path component PCE is calculated and a corresponding protection tunnel is established according to the protection tunnel information.
A computer program comprising program instructions that, when executed, implement the method of any one of claims 1 to 4.
A carrier carrying the computer program of claim 13.
A computer program comprising program instructions that, when executed, implement the method of any one of claims 5-7.
A carrier carrying the computer program of claim 15.