WO2017000562A1

WO2017000562A1 - Fast re-route method and device for ring network

Info

Publication number: WO2017000562A1
Application number: PCT/CN2016/073885
Authority: WO
Inventors: 李道春
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-07-01
Filing date: 2016-02-16
Publication date: 2017-01-05
Also published as: CN106330701B; CN106330701A

Abstract

Disclosed are a fast re-route (FRR) method and device for a ring network. The fast re-route method for the ring network comprises: configuring a neighboring node of a target node for data transmission in the ring network; establishing, according to the neighboring node, a backup channel path for data transmission; and allocating a channel label to the backup channel path, and generating a backup label switched path (LSP). Also disclosed is an FRR device for a ring network. The present invention improves the reliability of a ring network.

Description

Fast rerouting method and device for ring network

Technical field

The present application relates to the field of network communication technologies, for example, to a method and apparatus for fast rerouting of a ring network.

Background technique

In the MPLS (Multi-Protocol Label Switching) network, in order to ensure the reliability of the MPLS network, the FRR (Fast Re-Route) technology is used to detect the primary LSP (Label Switched Path). If the network node fails, the service is quickly switched to the backup LSP to reduce data loss and provide fast protection switching capability for the primary LSP. However, in the ring network, there is no guarantee that each primary LSP in the ring network has a backup LSP according to the existing FRR technology. When the primary LSP or the network node fails, and the primary LSP does not have a backup LSP. The fast re-routing function of the ring network cannot be implemented. As a result, the reliability of the ring network is not high.

Summary of the invention

The main purpose of the present application is to provide a fast rerouting method and device for a ring network, which aims to solve the technical problem of low reliability of the existing ring network.

To achieve the above objective, the embodiment of the present invention provides a method for fast rerouting of a ring network, and the method for fast rerouting of the ring network includes the following steps:

Configuring a neighboring node of the target node for data transmission in the ring network;

Establishing an alternate tunnel path for data transmission according to the neighboring node;

A tunnel label is allocated for the standby tunnel path to generate an alternate label switching path.

The step of establishing an alternate tunnel path for data transmission according to the neighboring node may include:

Setting a link tunnel between the neighboring node and a source node of data transmission;

And establishing, according to the link tunnel, the neighboring node as a neighboring node of the source node, and establishing an alternate tunnel path for data transmission.

The step of allocating a tunnel label to the standby tunnel path to generate an alternate label switching path Can include:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path Outer label

And generating an alternate label switching path according to the inner layer label and the outer layer label.

The step of allocating a tunnel label to the standby tunnel path and generating a backup label switching path may include:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path The outer label of the neighboring node is set as the inner control label of the standby tunnel path;

A spare label switching path is generated according to the inner layer label, the outer layer label, and the inner control label.

In addition, in order to achieve the above object, the embodiment of the present invention further provides a fast rerouting device for the ring network, and the fast rerouting device of the ring network includes:

a configuration module, configured to configure a neighboring node of the target node for data transmission in the ring network;

a setting module, configured to establish an alternate tunnel path for data transmission according to the neighboring node;

A label allocation module is configured to allocate a tunnel label to the standby tunnel path to generate an alternate label switching path.

The setting module can also be used to:

The tag distribution module can also be used to:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label of a next hop of each node of the standby tunnel path to An outer label of the standby tunnel path, where the tunnel label allocated by the neighboring node to the next hop of the neighboring node is set as an internal control label of the standby tunnel path;

The method and device for the fast rerouting of the ring network proposed by the present application, when establishing the alternate label switching path for data transmission, first configuring the neighboring node of the target node for data transmission in the ring network, and establishing data transmission according to the neighboring node. The standby tunnel path is then assigned a tunnel label for the standby tunnel path to generate an alternate label switching path, so that an alternate label switching path exists in each data transmission in the ring network, so that when the primary label switching path fails, it can be quickly Switching to the alternate label switching path reduces data loss and improves the reliability of the ring network.

DRAWINGS

1 is a schematic flowchart of a method for fast rerouting of a ring network according to a first embodiment of the present invention;

2 is a schematic diagram of an example of an access ring networking;

3 is a schematic diagram of an example of an access ring-aggregation ring-core ring network;

FIG. 4 is a flow chart showing the process of assigning a tunnel label to the standby tunnel path and generating a standby label switching path in the fast rerouting method of the ring network according to the second embodiment of the present invention;

FIG. 5 is a schematic diagram of functional modules of a fast rerouting device of a ring network according to an embodiment of the invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

The embodiment of the present invention provides a fast rerouting method for a ring network. Referring to FIG. 1, FIG. 1 is a schematic flowchart of a method for fast rerouting of a ring network according to the first embodiment of the present invention.

In this embodiment, the fast rerouting method of the ring network includes the following steps:

Step S10, configuring a neighboring node of the target node for data transmission in the ring network;

As shown in FIG. 2, in the embodiment, the method for the fast re-routing of the ring network in the embodiment of the present invention is described in detail by taking the access ring network shown in FIG. 2 as an example. When accessing MPLS at the S node When the service needs to send data such as service packets to the D node, based on the existing FRR technology, the main path from the S node to the D node is calculated as S->E->D; in the calculation of the S node to the D node In the case of the alternate path, the existing FRR technology needs to satisfy D_opt(A,D)<D_opt(A,S)+D_opt(S,D), where D_opt(A,D) refers to the shortest distance from the A node to the D node. Similarly, D_opt(A, S) refers to the shortest distance from the A node to the S node, and D_opt(S, D) refers to the shortest distance from the S node to the D node. However, in the access ring networking shown in FIG. 2, the requirement is not met, so an alternate path from the S node to the D node cannot be formed on the S node. In order to solve the problem, an alternate path of the source node to the target node (target node) in each service is established. In the embodiment of the present invention, a fast rerouting method for the ring network is proposed. In this embodiment, the primary tunnel path for establishing data transmission in the current service is: S->E->D. When establishing an alternate tunnel path for data transmission in this service, first configure the neighboring node of the target node (target node) for data transmission in this service. For example, in the access ring networking shown in FIG. 2, when data in the current service is sent to the D node, that is, when the target node is a D node, the neighboring node of the D node is first configured as a C node.

Step S20, establishing an alternate tunnel path for data transmission according to the neighboring node;

After the neighboring node of the D node is configured as the C node in step S10, the link tunnel between the source node and the neighboring node of the data transmission in the current service is set, that is, a link is set between the S node and the C node. tunnel. After a link tunnel is set up between the S node and the C node, the C node can serve as the neighboring node of the S node. At this time, the alternate tunnel path for establishing data transmission in this service according to the FRR technology is: S->A ->B->C->D.

Step S30, assigning a tunnel label to the standby tunnel path to generate an alternate label switching path.

After the above steps are used to establish the primary tunnel path for data transmission in this service as S->E->D, and the standby tunnel path is S->A->B->C->D, the primary tunnel is in the primary tunnel. In the path, the next hop of each node allocates a tunnel label to the active tunnel path, and establishes a primary label switching path for data transmission in the current service. For example, the E node allocates the tunnel label L6 to the S node, and the D node allocates the tunnel label L5 to the E node, and the main label switching path for establishing the data transmission in the current service is: S[L6]->E[L5]->D . In the alternate tunnel path, two layers of tunnel labels are allocated for the standby tunnel path. The outer label is a tunnel label assigned to the next hop of each node of the standby tunnel path. For example, the node A assigns a tunnel label L4 to the node S, the node B assigns a tunnel label L3 to the node A, and the node C assigns a tunnel to the node B. Label L2, the D node assigns a tunnel label L1 to the C node. Moreover, in this embodiment, the neighbor node and the source node of the target node for data transmission in the current service are set. A link tunnel is set, that is, a link tunnel is set between the S node and the C node, and the C node is used as the neighbor node of the S node, and the C node allocates a tunnel label to the S node. For example, the C node is an S node. Assign the tunnel label TL1. The tunnel label TL1 assigned by the C node to the S node is set as the inner layer label of the standby tunnel path. According to the outer label and the inner label allocated by the standby tunnel path, the alternate label switching path for generating data transmission in the current service is: S[L4|TL1]->A[L3|TL1]->B[L2| TL1]->C[L1]->D.

When the primary label switching path S[L6]->E[L5]->D of the data transmission in this service is normal, the primary label switching path is used to perform data transmission of the current service. When the primary label switching path fails, for example, when the link between the S node and the E node is interrupted, the current service is immediately switched to the standby label switching path S[L4|TL1]->A[L3| On TL1]->B[L2|TL1]->C[L1]->D, the data transmission of this service is performed by using the alternate label switching path.

Further, the fast rerouting method of the ring network in this embodiment is not limited to being applied in the access ring networking shown in FIG. 2. For example, in the IP RAN (Radio Access Network), as shown in Figure 3, in the access ring-aggregation ring-core ring network, when the UPE1 node accesses the service, the service needs to be sent to the NPE3 node. The service is first forwarded from the UPE1 node to the SPE1 node in the access ring network and then forwarded to the NPE3 node. In the process of forwarding from the UPE1 node to the SPE1 node in the access ring network, the primary tunnel path for establishing data transmission in the service according to the FRR technology is UPE1->P1->SPE1. When establishing the alternate tunnel path for data transmission in the service, first configure the neighboring node of the SPE1 node as SPE2, and then establish the standby tunnel path for data transmission in the service according to the neighboring node SPE2 as UPE1->UPE2->P2->SPE2 ->SPE1. And assigning a tunnel label to the primary tunnel path and the standby tunnel path, and establishing an active label switching path and an alternate label switching path for data transmission in the access ring network in the service. For example, the primary label switching path for establishing data transmission in the access ring network is: UPE1[L6]->P1[L5]->SPE1, and the alternate label switching path is: UPE1[L4|TL1]- >UPE2[L3|TL1]->P2[L2|TL1]->SPE2[L1]->SPE1. When the primary label switching path fails, for example, the P1 node fails, the switch immediately switches to the standby label switching path, and the service is forwarded to the SPE1 node through the standby label switching path, and then the normal path is followed. Forward to the NPE3 node.

The fast rerouting method of the ring network provided in this embodiment, when establishing the alternate label switching path for data transmission, first configuring the neighboring node of the target node for data transmission in the ring network, according to the The neighboring node establishes an alternate tunnel path for data transmission, and then allocates a tunnel label to the standby tunnel path to generate an alternate label switching path, so that an alternate label switching path exists in each data transmission in the ring network, so when the primary label is switched When the path is faulty, you can quickly switch to the alternate label switching path to reduce data loss and improve the reliability of the ring network.

Further, as shown in FIG. 4, a fast rerouting method for the ring network according to the second embodiment of the present invention is proposed based on the first embodiment. In the second embodiment, the foregoing step S30 includes:

Step S31, setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path to the An outer label of the standby tunnel path, where the tunnel label allocated by the neighboring node to the next hop of the neighboring node is set as an internal control label of the standby tunnel path;

Step S32, generating an alternate label switching path according to the inner label, the outer label, and the inner control label.

In the above-mentioned first embodiment, when the primary label switching path S[L6]->E[L5]->D of the data transmission in the current service fails, the current service is immediately switched to the standby label switching path. S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[L1]->D. However, there is a case where the alternate label switching path S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[L1]->D may also malfunction, for example, When the link between the C node and the D node is interrupted, when the data of this service is transmitted to the C node, data transmission cannot be performed through the C[L1]->D path, and since C[L1]->D The path exists in the alternate label switching path C->B->A->S[L6]->E[L5]->D. Therefore, when the link between the C node and the D node is interrupted, C[L1 is adopted. ]->D alternate label switching path C->B->A->S[L6]->E[L5]->D for data transmission. When the data is transmitted to the S node, the link between the S node and the E node is interrupted, and the current service is immediately switched to the standby label switching path S[L4|TL1]->A[L3|TL1]->B [L2|TL1]->C[L1]->D. Therefore, the data transmission in this service will be looped back and forth between the S-A-B-Cs, which will cause network congestion and affect the normal forwarding of other services on the S-A-B-C path.

In order to prevent the network from being blocked, in this embodiment, when establishing the alternate label switching path for data transmission in the current service, on the basis of the first embodiment, the next hop allocation tunnel of each node except the standby tunnel path is used. a label, which is set as an outer label of the standby tunnel path, and the neighboring node allocates a tunnel label to the source node, and sets it as an inner label of the standby tunnel path. The neighbor node of the target node configured in the middle, that is, the C node, for its next The hop allocates a tunnel label. For example, the C node assigns a tunnel label IL1 to its next hop. The tunnel label IL1 is set as the internal control label IL1 of the standby tunnel path, and the internal control label IL1 and the D node allocate a tunnel label L1 for the C node to form a forwarding interface for data transmission in the current service. Therefore, according to the outer label, the inner layer label and the internal control label, the alternate label switching path is generated as: S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[ L1|IL1]->D.

When the primary label switching path S[L6]->E[L5]->D of the data transmission in this service fails, the current service is immediately switched to the above-mentioned alternate label switching path S[L4|TL1] -> A[L3|TL1]->B[L2|TL1]->C[L1|IL1]->D. If the alternate label switching path S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[L1|IL1]->D is normal, the alternate label switching path is used for data. transmission. When the data of the current service is transmitted to the C node, and the data is encapsulated and forwarded, the internal control tag IL1 is stripped off, that is, the internal control tag IL1 is not carried in the data transmitted from the C node to the D node. If the alternate label switching path also fails, for example, the link between the C node and the D node is interrupted, when the data of the current service is transmitted to the C node, the data cannot be performed through the C[L1|IL1]->D path. During transmission, due to the presence of the internal control tag IL1 information, the alternate label switching path C->B->A->S[L6]- using the C[L1]->D path is no longer as described in the above-listed case. >E[L5]->D performs data transmission, but directly discards the data transmitted to the C node. Thereby the network congestion caused by the above situation is prevented.

In the fast rerouting method of the ring network provided by this embodiment, when the standby label switching path of the data transmission is established, the neighboring node of the configured target node allocates an internal control label for the next hop according to the allocated inner label, The layer label and the internal control tag generate an alternate label switching path. When the standby label switching path fails, the data is directly discarded, thereby preventing network congestion, and further improving the reliability of the ring network.

The third embodiment of the present invention further provides a fast rerouting device for a ring network. Referring to FIG. 5, FIG. 5 is a functional block diagram of a fast rerouting device for a ring network according to a third embodiment of the present invention.

In this embodiment, the fast rerouting device of the ring network includes:

The configuration module 10 is configured to configure a neighboring node of the target node for data transmission in the ring network;

As shown in FIG. 2, in the embodiment, the ring re-routing device of the present invention is described in detail by taking the access ring networking shown in FIG. 2 as an example. When the MPLS service is accessed at the S node, data such as service packets need to be sent to the D node, and based on the existing FRR technology, the slave S is calculated. The primary path from the node to the D node is S->E->D. When calculating the alternate path from the S node to the D node, the existing FRR technology needs to satisfy D_opt(A,D)<D_opt(A,S)+D_opt (S, D), where D_opt(A, D) refers to the shortest distance from the A node to the D node. However, in the access ring networking shown in FIG. 2, the requirement is not met, so an alternate path from the S node to the D node cannot be formed on the S node. In order to solve the problem, an alternate path of the source node of the data transmission to the target node (target node) in each service is established. In the present invention, a fast rerouting device for the ring network is proposed. In this embodiment, the primary tunnel path for establishing data transmission in the current service is: S->E->D. When establishing an alternate tunnel path for data transmission in the current service, the configuration module 10 first configures the neighboring node of the target node (target node) of the data transmission in the current service. Specifically, in the access ring networking shown in FIG. 2, when the data in the current service is sent to the D node, that is, the target node is the D node, the configuration module 10 configures the neighboring node of the D node as the C node.

The setting module 20 is configured to establish an alternate tunnel path for data transmission according to the neighboring node;

After the neighboring node of the D node is configured as the C node by the configuration module 10, the setting module 20 establishes an alternate tunnel path for data transmission according to the neighboring node. Specifically, the setting module 20 sets a link tunnel between the source node of the data transmission in the current service and the neighbor node, that is, sets a link tunnel between the S node and the C node. After a link tunnel is set up between the S node and the C node, the C node can serve as the neighboring node of the S node. At this time, the setting module 20 establishes the alternate tunnel path for data transmission in the current service according to the FRR technology: ->A->B->C->D.

The label allocation module 30 is configured to allocate a tunnel label to the standby tunnel path to generate an alternate label switching path.

When the primary tunnel path for establishing data transmission in this service is S->E->D, and the standby tunnel path is S->A->B->C->D, in the primary tunnel path, The next hop of each node uses the label assignment module 30 to allocate a tunnel label to the primary tunnel path, and establishes a primary label switching path for data transmission in the current service. For example, the E node allocates the tunnel label L6 to the S node, and the D node allocates the tunnel label L5 to the E node, and the main label switching path for establishing the data transmission in the current service is: S[L6]->E[L5]->D . In the alternate tunnel path, the label assignment module 30 assigns two layers of tunnel labels to the alternate tunnel path. The outer label is a tunnel label assigned by the label assignment module 30 for the next hop of each node of the standby tunnel path. For example, the node A uses the label assignment module 30 to allocate a tunnel label L4 for the S node, and the node B uses the label assignment module 30. A tunnel label L3 is assigned to the node A, and the node C uses the label assignment module 30 to allocate a tunnel label L2 to the node B. The label assignment module 30 assigns a tunnel label L1 to the C node. Moreover, in this embodiment, since a link tunnel is set between the neighboring node and the source node of the target node for data transmission in the current service, that is, a link tunnel is set between the S node and the C node, C The node acts as a neighboring node of the S node, and the C node uses the label assignment module 30 to assign a tunnel label to the S node. For example, the C node uses the label assignment module 30 to allocate the tunnel label TL1 to the S node. The tunnel label TL1 assigned by the C node to the S node is set as the inner layer label of the standby tunnel path. According to the outer label and the inner label allocated by the standby tunnel path, the alternate label switching path for generating data transmission in the current service is: S[L4|TL1]->A[L3|TL1]->B[L2| TL1]->C[L1]->D.

Further, the fast rerouting device of the ring network in this embodiment is not limited to being applied in the access ring networking shown in FIG. 2. For example, in the IP RAN, in the access ring-aggregation ring-core ring network shown in FIG. 3, when the UPE1 node accesses the service and needs to send the service to the NPE3 node, the service is first in the access ring network. The middle is forwarded from the UPE1 node to the SPE1 node, and then forwarded to the NPE3 node. In the process of forwarding from the UPE1 node to the SPE1 node in the access ring network, the primary tunnel path for establishing data transmission in the service according to the FRR technology is UPE1->P1->SPE1. When the standby tunnel path of the data transmission in the service is established, the configuration module 10 first configures the neighboring node of the SPE1 node to be the SPE2, and the setting module 20 establishes the standby tunnel path of the data transmission in the service according to the neighboring node SPE2 as UPE1->UPE2- >P2->SPE2->SPE1. The label distribution module 30 allocates a tunnel label to the primary tunnel path and the backup tunnel path, and establishes an active label switching path and a backup label switching path for data transmission in the access ring network in the service. For example, the primary label switching path for establishing data transmission in the service is: UPE1[L6]->P1[L5]->SPE1, and the alternate label switching path is: UPE1[L4|TL1]->UPE2[L3|TL1] ->P2[L2|TL1]->SPE2[L1]->SPE1. When the primary label switching path fails, for example, the P1 node fails, the switch immediately switches to the standby label switching path, and the service is forwarded to the SPE1 node through the standby label switching path, and then the normal path is followed. Forward to the NPE3 node.

The fast rerouting device of the ring network provided by this embodiment, when establishing a standby label for data transmission When the switching path is signed, the first configuration module 10 configures the neighboring node of the target node for data transmission in the ring network, and the setting module 20 establishes a standby tunnel path for data transmission according to the neighboring node, and the label allocation module 30 allocates the standby tunnel path. The tunnel label is used to generate the alternate label switching path. The backup label switching path exists when data is transmitted in the ring network. Therefore, when the primary label switching path fails, the switch can be quickly switched to the alternate label switching path, thus reducing data loss. Improve the reliability of the ring network.

Further, in the fast rerouting device of the ring network proposed by the third embodiment, the label distribution module 30 is further configured to:

In order to prevent the network from being blocked, in this embodiment, when establishing the alternate label switching path for data transmission in the current service, on the basis of the first embodiment, the label assigning module 30 except the nodes of the standby tunnel path The next hop allocation tunnel label is set to an outer label of the standby tunnel path, and the neighboring node is configured to allocate the tunnel label to the source node as the standby tunnel. In addition to the inner label of the path, the label assignment module 30 also assigns a neighboring node of the target node configured by the module 10, that is, the C node, to assign a tunnel label to its next hop. For example, the C node utilizes the label assignment module 30 to assign a tunnel label IL1 to its next hop. The label distribution module 30 sets the tunnel label IL1 as the internal control label IL1 of the standby tunnel path, and the internal control label IL1 and the D node allocate a tunnel label L1 for the C node to form a forwarding interface for data transmission in the current service. Therefore, according to the outer label, the inner layer label and the internal control label, the alternate label switching path is generated as: S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[ L1|IL1]->D.

When the primary label switching path S[L6]->E[L5]->D of the data transmission in this service fails, the current service is immediately switched to the above-mentioned alternate label switching path S[L4|TL1] -> A[L3|TL1]->B[L2|TL1]->C[L1|IL1]->D. If the alternate label switching path S[L4|TL1]->A[L3|TL1]->B[L2|TL1]->C[L1|IL1]->D is normal, the alternate label switching path is used for data. transmission. When the data of the current service is transmitted to the C node, and the data is encapsulated and forwarded, the internal control tag IL1 is stripped off, that is, the internal control tag IL1 is not carried in the data transmitted from the C node to the D node. If the alternate label switching path also fails, for example, the link between the C node and the D node is interrupted, when the data of the current service is transmitted to the C node, the data cannot be performed through the C[L1|IL1]->D path. During transmission, due to the presence of the internal control tag IL1 information, the alternate label switching path C->B->A->S[L6]- using the C[L1]->D path is no longer as described in the above-listed case. >E[L5]->D performs data transmission, but directly discards data transmitted to the C node, thereby preventing network congestion caused by the above situation.

When the fast rerouting device of the ring network is provided in this embodiment, when the standby label switching path of the data transmission is established, the neighboring node of the configured target node uses the label allocation module 30 to allocate an internal control label to the next hop according to the allocation. The inner label, the outer label, and the internal label generate an alternate label switching path. When the standby label switching path fails, the data is directly discarded, thereby preventing network congestion, and further improving the reliability of the ring network.

The above are only some of the exemplary embodiments of the present invention, and are not intended to limit the scope of the present application, and the equivalent structure or equivalent flow transformations made by the contents of the specification and the drawings of the present application, or directly or indirectly applied to other related The technical field is equally included in the scope of protection of the present application.

Claims

A fast rerouting method for a ring network includes:

Configuring a neighboring node of the target node for data transmission in the ring network;

Establishing an alternate tunnel path for data transmission according to the neighboring node;

A tunnel label is allocated for the standby tunnel path to generate an alternate label switching path.
The fast rerouting method of the ring network according to claim 1, wherein the standby tunnel path for establishing data transmission according to the neighboring node comprises:

Setting a link tunnel between the neighboring node and a source node of data transmission;

And establishing, according to the link tunnel, the neighboring node as a neighboring node of the source node, and establishing an alternate tunnel path for data transmission.
The method of claim 2, wherein the assigning a tunnel label to the standby tunnel path and generating a backup label switching path includes:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path Outer label

And generating an alternate label switching path according to the inner layer label and the outer layer label.
The method of claim 2, wherein the assigning a tunnel label to the standby tunnel path and generating a backup label switching path includes:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path The outer label of the neighboring node is set as the inner control label of the standby tunnel path;

A spare label switching path is generated according to the inner layer label, the outer layer label, and the inner control label.
A fast rerouting device for a ring network includes:

a configuration module, configured to configure a neighboring node of the target node for data transmission in the ring network;

a setting module, configured to establish an alternate tunnel path for data transmission according to the neighboring node;

A label allocation module is configured to allocate a tunnel label to the standby tunnel path to generate an alternate label switching path.
The ring-network fast rerouting device of claim 5, wherein the setting module is configured to:

Setting a link tunnel between the neighboring node and a source node of data transmission;

And establishing, according to the link tunnel, the neighboring node as a neighboring node of the source node, and establishing an alternate tunnel path for data transmission.
The ring-networking fast rerouting device of claim 6, wherein the tag distribution module is configured to:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path Outer label

And generating an alternate label switching path according to the inner layer label and the outer layer label.
The ring-networking fast rerouting device of claim 6, wherein the tag distribution module is configured to:

Setting a tunnel label allocated by the neighboring node to the source node as an inner layer label of the standby tunnel path, and setting a tunnel label assigned by a next hop of each node of the standby tunnel path as the standby tunnel path The outer label of the neighboring node is set as the inner control label of the standby tunnel path;

A spare label switching path is generated according to the inner layer label, the outer layer label, and the inner control label.