WO2010034215A1

WO2010034215A1 - Fault process method, equipment and system of ring network service

Info

Publication number: WO2010034215A1
Application number: PCT/CN2009/073044
Authority: WO
Inventors: 张海燕; �龙昊; 曾理
Original assignee: 华为技术有限公司
Priority date: 2008-09-28
Filing date: 2009-08-03
Publication date: 2010-04-01
Also published as: CN101686166B; CN101686166A

Abstract

A fault process method, equipment and system of ring network service, the method comprises the steps of that: when the fault is occurred, encapsulating the service affected by said fault with a protection label of PW(s101); utilizing said protection label of PW to perform protection switching and transferring of said service(s102). In an embodiment of the present invention, when the fault is occurred, protection switching and transferring of said service is performed according to the protection label of PW, the process method is simple and the occupied resource is little.

Description

The invention relates to a Chinese patent application for a ring network service fault processing method, device and system, which is filed on September 28, 2008, and the application number is 200810168479.4, and the invention name is "a loop network service fault processing method, device and system" Priority is hereby incorporated by reference in its entirety.

Technical field

The present invention relates to the field of communications, and in particular, to a ring network service fault processing method, apparatus, and system.

Background technique

Typical packet switching technologies include Ethernet and IP/MPLS (Multi-protocol label switching). Traditionally, Ethernet technology is commonly used in local area networks, and IP/MPLS technology is commonly used in core networks to provide fast IP packet forwarding and good enterprise VPN support. In recent years, packet switching technology has become very popular and has begun to enter the operator transmission network. Current MPLS network deployments typically use a mesh topology, and the delivery network typically uses a ring topology due to its deployment characteristics. Traditional transmission networks, such as SDH (Synchronized Digital Hierarchy) networks, use ring topology networking and use SDH's powerful ADM (Add, Drop, Multiplex) capabilities to efficiently transmit services. At the same time, according to the characteristics of the ring network, the MSPRing ring protection scheme is developed to implement fast protection switching of services. The actual deployment proves that the application and demand of the ring are very common in the SDH era. After the transmission network is transitioned from SDH to the packet-switched network, the ring-network technology of the packet-switched network also has broad application prospects because the pre-deployed fiber is still ring-shaped.

An MPLS ring protection scheme is defined in the prior art. The solution is based on the physical ring topology and performs service up and down protection switching at the LSP (Label Switching Path) layer. In this solution, a closed-loop backup LSP is established for each protected LSP. After the link fails, the service is switched to the backup LSP on the node where the link fault is detected, and the backup LSP is forwarded to another detection. Switch to the original LSP after the node that has failed the link. In the process of implementing the present invention, the inventors have found that at least the following disadvantages exist in the prior art: A corresponding protection closed-loop LSP needs to be established for each working LSP, which is complicated in configuration and large in resource occupation.

Summary of the invention

The embodiments of the present invention provide a method, a device, and a system for processing a ring network service fault, so as to effectively process a service when a fault occurs.

The embodiment of the present invention provides a method for processing a ring network service fault, which includes the following steps: when a fault occurs, encapsulating a protection label of the PW for a service affected by the fault; using the protection label of the PW, using the protection label of the PW Perform protection switching and forwarding.

An embodiment of the present invention provides a ring network service fault processing apparatus, including:

a label encapsulating unit, configured to encapsulate a protection label of the PW for a service affected by the fault when a fault occurs;

The service protection unit is configured to perform protection switching and forwarding on the service by using the protection label of the PW.

The embodiment of the invention further provides a ring network service fault processing system, which includes a first node and a second node.

The first node is configured to: when a fault occurs, send the protection label encapsulating the PW protection label in a direction opposite to the initial service sending direction, to the protection label of the service encapsulation PW affected by the failure;

The second node is configured to receive the service of the PW protected label, and release the

The protection label of the PW enables the service to be recognized normally.

The embodiment of the invention further provides a ring network node, including:

Protecting the encapsulation unit for protecting the PW of the service encapsulation affected by the failure when a failure occurs;

a service sending unit, configured to send the encapsulation in a direction opposite to an initial service sending direction

PW's protection label business. Compared with the prior art, the embodiment of the invention has at least the following advantages:

In the embodiment of the present invention, when a fault occurs, the service is protected and switched according to the protection label of the PW, and the processing method is simple and the resource occupation is small.

DRAWINGS

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

2 is a schematic structural diagram of a ring network topology according to an embodiment of the present invention;

3 is a schematic flowchart of a method provided by an embodiment of the present invention;

4 is a schematic diagram of a forwarding table of a method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of label switching according to a method according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic flowchart of a method according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a forwarding table according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of label switching according to a method according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a system according to an embodiment of the present invention; FIG.

FIG. 11 is a schematic structural diagram of a system according to an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a system according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic structural diagram of a ring network node according to an embodiment of the present invention.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

An embodiment of the present invention provides a method for processing a ring network service fault, as shown in FIG. 1 , including the following steps:

Step sl01: When a fault occurs, the protection label of the PW is encapsulated in the service affected by the fault; Step sl02, the protection label of the PW is used to protect and switch the service.

By using the method provided by the embodiment of the present invention, the PW mechanism is used to send services on the ring topology group network. When a fault occurs, the service is protected and switched according to the protection label of the PW. The processing method is simple and the resource occupation is small. A method for processing a ring network service fault according to another embodiment of the present invention includes the following steps: Step s101: When a fault occurs, the protection label of the service encapsulation PW affected by the fault is generated; The protection-affected service encapsulates the protection label of the PW, specifically, the protection label of the PW of the service-side neighboring node that encapsulates the service to the service.

Step sl02: The protection label is switched and forwarded by using the protection label of the PW.

The protection switching and forwarding of the service by using the protection label of the PW includes:

Forwarding the PW-encapsulated protection label in a direction opposite to the initial service transmission direction;

The faulty service receiving side neighboring node receives the service of encapsulating the PW protection label, and releases the protection label of the PW of the service, so that the service is normally recognized.

All nodes on the PW have protection label information of the PW.

The forwarding of the PW-encapsulated protection label in the opposite direction to the initial service transmission direction includes: using the PW protection label as a service PW label, and forwarding the service according to the PW label of the service;

The service of the faulty service receiving side neighboring node receiving the protection label encapsulating the PW includes: searching the inbound label and the protection label field of the node forwarding table according to the PW label of the service, and receiving the encapsulated PW. Protection of the label business.

By using the method provided by the embodiment of the present invention, the PW mechanism is used to send services on the ring topology group network. When a fault occurs, the service is protected and switched according to the protection label of the PW. The processing method is simple and the resource occupation is small.

A method for processing a ring network service fault according to another embodiment of the present invention includes the following steps: Step s101: When a fault occurs, the protection label of the service encapsulation PW affected by the fault is generated; The protection-affected service encapsulates the protection label of the PW, specifically the protection label of the PW by the source node of the PW to encapsulate the PW. Step s102: Perform protection switching and forwarding on the service by using the protection label of the PW.

And transmitting, by the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, and the PW Business.

The source node and the sink node of the PW have protection label information of the PW,

The services of forwarding the PW-encapsulated protection label in the opposite direction to the initial service transmission direction include:

The receiving, by the PW, the PW-encapsulated protection label service includes: performing, according to the PW label of the service, the inbound label and the protection label field of the node forwarding table, and receiving the service of the PW-protected label .

The present invention will be further described in detail below in conjunction with specific application scenarios.

The embodiment of the present invention provides a loop network service fault processing method, which uses a single-hop LSP to construct a ring topology. A single-hop LSP is an LSP connected in the same direction between adjacent nodes, and non-adjacent nodes are connected through multiple LSPs in the same direction. . There are two (or more) LSPs in opposite directions between each adjacent two nodes on the ring, namely a clockwise LSP and a counterclockwise LSP. Each node on the ring can identify and service the service according to the existing mechanism. The service between the two adjacent nodes is carried on an LSP, and the SS-PW (Single-Segment Pseudowire) is used. The service between the non-adjacent nodes is carried on multiple LSPs and is transmitted by using MS-PW (Multi-Segment Pseudowire). The fault detection of each LSP is implemented by OAM or other detection mechanism between adjacent nodes on the ring.

Specifically, as shown in FIG. 2a, six nodes A~F in the network can form a physical ring, and clockwise LSPs A->B, B->C, C->D, D->E , E->F, F->A tags are Tll, T12, Τ13, Τ14, Τ15, T16; counterclockwise LSP B->A, A->F, F->E, E->D, D ->C, C->B tags are T21, T26, T25, T24, T23, T22. As shown in Figure 2b, PWl-1 and PW1-2 are opposite MS-PWs. Binding the two PWs enables bidirectional service transmission. For example, the service is sent between nodes F~C as an example. The upper part of the square in Figure 2b represents the LSP label. The node connected to the LSP can identify the label. The lower part 100 of the square in the figure is the outgoing label of the node F and the incoming label of the node A. 200 is the outgoing label of the node A. Incoming label of node B; 300 is the outbound label of node B, and the inbound label of node C. Similarly, 400, 500, and 600 are reverse transmission services, that is, the ingress and egress labels of the service at node when transmitting from node C to node F.

Specifically, the MS-PW service of the node F to the C is sent, and the sending failure between the nodes A and B on the PW is taken as an example.

As shown in Figure 3, the following steps are included:

Step s301, assigning a PW protection label.

The PW protection label is unique. In the case of a single ring, the protection label is unique in the whole ring. In the case of a cross-ring, the protection label is unique across the entire network. A pair of bound PWs that implement bidirectional service transmission may have the same or different protection labels. The PW protection label can be allocated to each PW through the management plane to ensure the uniqueness of the protection label. Or, the management plane first assigns different protection label ranges to the nodes on the ring. There is no intersection between the label ranges. The source node of the PW selects a label from its own protection label range and assigns it to the PW as a protection label. All nodes on each PW must have the protection label information of the PW, that is, each node on the ring must have the protection label information of the PW where it is located. The allocation of the PW protection label can be implemented by extending the existing signaling, that is, carrying the protection label on the PW by signaling, and ensuring that each corresponding PW signaling is received. The node of the interest gets the protection tag information. The allocation of the PW protection label can also be configured through the management plane to ensure that the relevant node obtains the protection label information.

Taking the forwarding table shown in Figure 4a as an example, all nodes F, A, B, and C on the MS-PW PW1-1 have PWl-1 protection label information (PL, Protection Label) 90. Each node in the table has the corresponding PW forwarding information, including TL ( Tunnel Label ) LSP label, IL (Input Label ) PW in label, OL ( Output Label ) PW out label, Action label operation mode, PL (Protection Label) PW protection label.

For example, the label of LSP B->C is T12, and both nodes C and C have information about the label. 100 is the outgoing label OL sent by the service node F, and is the incoming label IL received by the node A.

Action indicates the action of the node on the service. For example, the action push of node F indicates that the service is tagged with information. PL 90 is a PW protection label that all nodes on the PW have, and the PW protection label can be exchanged by the node to IL or OL.

It can be seen from Fig. 4a that all nodes F~C on the PW have the protection label PL, and the protection label PL is 90. As can be seen from Figures 4a and 4b, a pair of bound PWs that implement bidirectional service transmission, such as PW 1-1 and PW 1-2, may use the same or different protection labels.

Step s302: Normally, the PW1-1 service starts to be sent from the node F to the node C.

As shown in Figure 2b, the node F sends the LSP label T16 and the PW label 100 to the node A for the service.

Step s303: When the ring network fails, nodes A and B know that they are faulty neighbor nodes.

As shown in Figure 5a, a link or LSP fault occurs between node A and node B. OAM or other mechanisms (such as signaling, network management, etc.) send a fault notification to the node, and nodes A and B know that they are faulty neighbors. node.

In step s304, node A performs protection switching.

The node A uses the protection label 90 of the PW1-1 as the PW label of the service, and superimposes the label T26 of the reverse LSP thereon, and then transmits the service of the PW-protected label 90 in the opposite direction to the initial service transmission direction. The business is switched to the counterclockwise direction. In step s305, the service is transparently transmitted to the node 8.

Non-failed neighbors? The E, D, and C find the inbound label field of the forwarding table according to the PW label 90. If there is no corresponding forwarding entry in the forwarding table, the service is transparently transmitted to the node B.

In step s306, the node B performs protection switching.

After receiving the service of the protection label of the PW, the node B finds the inbound label and the protection label field of the forwarding table according to the PW label 90, and finds the normal PW out label 300 of the service corresponding to the protection label 90, and cancels the service. The PW protection label exchanges the PW label 90 of the service to 300, and the LSP label is exchanged to T12, and then sent in the reverse direction, that is, clockwise to the next node.

Step s307, the node C receives the service.

The node C searches for the forwarding entry according to the ingress tag 300, receives the service, identifies the service information carried by the service, and completes the service transmission.

As shown in FIG. 5b, the service protection method of the MS-PW PW1-2 of the nodes C to F and the PW1-1 use the PW mechanism to send services on the ring topology group network by using the method provided by the embodiment of the present invention. According to the protection label of the PW, the service is protected and switched, and the processing method is simple and the resource occupation is small.

The embodiment of the present invention further provides a method for processing a ring network service fault. As shown in FIG. 6, the method includes the following steps:

Step s601, assigning a PW protection label.

The PW protection label is unique. In the case of a single ring, the protection label is unique in the whole ring. In the case of a cross-ring, the protection label is unique across the entire network. A pair of bound PWs that implement bidirectional service transmission may have the same or different protection labels. The PW protection label can be allocated to each PW through the management plane to ensure the uniqueness of the protection label. Or, the management plane first assigns different protection label ranges to the nodes on the ring. There is no intersection between the label ranges. The source node of the PW selects a label from its own protection label range and assigns it to the PW as a protection label. Every PW A node must have the protection label information of the PW, that is, each node on the ring must have the protection label information of its PW. The allocation of the PW protection label can be implemented by extending the existing signaling, that is, the signaling carries the protection label on the PW, and ensures that each node that receives the corresponding PW signaling message obtains the protection label information. The allocation of the PW protection label can also be configured through the management plane to ensure that the relevant node obtains the protection label information.

Taking the forwarding table shown in Figure 7a as an example, the source and sink nodes F and C on the MS-PW PW1-1 have a PW1-1 protection label (PL, Protection Label) 90. Each node in the table has the corresponding PW forwarding information, including TL (Tunnel Label) LSP label, IL (Input Label) PW in label, OL (Output Label) PW out label, Action label operation mode, PL (Protection Label) PW protection label.

Step s602: Normally, the service of PW1-1 starts from node F and is sent to node C. As shown in Figure 2b, initially, node F sends the LSP label T16 and PW label 100 to the node A for the service.

Step s603: When the ring network fails, the nodes F and C know that they are the source and sink nodes of the PW affected by the fault.

As shown in Figure 8a, when a link or LSP fails between nodes A and B, the service fails to be sent from A to B. OAM or other mechanisms (signaling, network management, etc.) issue a fault notification, and nodes F and C know themselves. The source and sink nodes of PW PW1-1 are affected by the fault.

In step s604, the source node F performs protection switching.

The node F uses the protection label 90 of the PW1-1 as the PW label of the service, and superimposes the label T25 of the reverse LSP thereon, and then transmits the service of the PW-protected label 90 in the opposite direction to the initial service transmission direction, that is, The business is switched to the counterclockwise direction.

Step s605, transparently transmitting the service to the node ( .

The non-fault neighboring nodes E and D look up the inbound label field of the forwarding table according to the PW label 90, and there is no corresponding forwarding entry in the forwarding table, and the service is transparently transmitted to the node C.

In step s606, the sink node C performs protection switching. After receiving the service encapsulating the protection label of the PW, the node c searches for the ingress label and the protection label field of the forwarding entry according to the PW label 90, finds the protection label 90, receives the service from the counterclockwise direction of the ring, and cancels the service. The PW protection tag identifies the business information and the service delivery is completed.

As shown in FIG. 8b, the service protection method of the MS-PW PW1-2 of the nodes C to F and the PW1-1 use the PW mechanism to send services on the ring topology group network by using the method provided by the embodiment of the present invention. According to the protection label of the PW, the service is protected and switched, and the processing method is simple and the resource occupation is small.

The embodiment of the present invention is described by sending an MS-PW service of the node F to the C, and transmitting a fault between the nodes A and B on the PW. For other cases, for example, when the nodes A and B fail, the processing method is similar. The embodiments of the present invention are not described again.

The embodiment of the present invention further provides a ring network service fault processing device. As shown in FIG. 9, the method includes: a label encapsulating unit 91, configured to encapsulate a protection label of the PW for a service affected by the fault when a fault occurs;

The service protection unit 92 is configured to perform protection switching and forwarding on the service by using the protection label of the PW.

By using the device provided by the embodiment of the present invention, when a fault occurs, the service is protected and switched according to the protection label of the PW, and the processing method is simple and the resource occupation is small.

The embodiment of the present invention further provides a ring network service fault processing system, as shown in FIG. 10, including a first node 101 and a second node 102;

The first node 101 is configured to: when the fault occurs, the protection label of the service encapsulation PW affected by the failure, and the second node 102 that encapsulates the PW protection label in a direction opposite to the initial service transmission direction, for receiving the encapsulation PW's protection label business, lifting the business

The protection label of the PW enables the service to be received normally. By using the system provided by the embodiment of the present invention, when a fault occurs, the service is protected and switched according to the protection label of the PW, and the processing method is simple and the resource occupation is small.

The embodiment of the present invention further provides a ring network service fault processing system. As shown in FIG. 11, the system further includes one or more intermediate nodes 103, and the intermediate node is configured to perform sub-transmission according to the PW label of the service. Pass the business.

The embodiment of the present invention further provides a ring network service fault processing system. As shown in FIG. 12, the first node 101 includes:

The protection encapsulation unit 1011 is configured to: when the service transmission fails, protect the PW protection label of the service;

The service sending unit 1012 is configured to send the service of the PW encapsulated protection label in a direction opposite to the initial service transmission.

The second node 102 includes:

The service receiving unit 1021 is configured to receive a service of the PW encapsulated protection label sent by the service sending unit 1012.

The protection release unit 1022 is configured to release the protection label of the PW of the service received by the service receiving unit 1021, so that the service is normally received.

By using the system provided by the embodiment of the present invention, the PW mechanism is used to send services on the ring topology network. When a fault occurs, the PW protection label is used to protect the service affected by the fault. The protection method is simple and the resource occupation is small.

The embodiment of the present invention further provides a ring network node, as shown in FIG. 13, including:

The protection encapsulation unit 121 is configured to: when the service transmission fails, protect the PW of the service encapsulation affected by the failure;

The service sending unit 122 is configured to send the service of the PW encapsulated protection label in a direction opposite to the initial service transmission.

By using the node provided by the embodiment of the present invention, the PW mechanism is used to send a service on the ring topology group network. When a fault occurs, the protection label of the service encapsulation PW affected by the failure is implemented. Business protection.

For the specific signal processing, the execution process, and the like of the foregoing apparatus, the system, and the ring network node embodiment, the description of the method embodiment of the present invention is omitted, and the details are not described herein again.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

In summary, the above description is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

A method for processing a fault of a ring network service, comprising the steps of: protecting a label of a service encapsulation PW affected by the fault when a fault occurs; and using the protection label of the PW to perform the service Protection switching and forwarding.

2. The method according to claim 1, wherein, when a fault occurs, the protection label of the PW for the service affected by the fault is specifically the service sending side neighboring node of the faulty service to the service Encapsulating the protection tag of the PW.

The method of claim 2, wherein the protection switching and forwarding of the service by using the protection label of the PW specifically includes:

The service receiving side neighboring node that forwards the PW-encapsulated protection label in the opposite direction to the initial service transmission direction receives the service encapsulated with the PW protection label, and releases the protection of the PW of the service. The tag causes the service to be recognized normally.

The method of claim 3, wherein all nodes on the PW have protection label information of the PW,

The method according to claim 1, wherein, when a fault occurs, the protection label of the PW is encapsulated by the service affected by the fault, and the source node of the PW encapsulates the PW of the service Protection label.

The method of claim 5, wherein the protection switching and forwarding of the service by using the protection label of the PW specifically includes: And transmitting, by the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, the PW, and the PW Business.

7. The method according to claim 6, wherein the source node and the sink node of the PW have protection label information of the PW,

A ring network service fault processing device, comprising:

The service processing unit is configured to perform protection switching and forwarding on the service by using the protection label of the PW.

A loop network service fault processing system, comprising: a first node and a second node, wherein the first node is configured to protect a service encapsulation PW that is affected by the fault when a fault occurs. Transmitting the service of the PW-encapsulated protection label in a direction opposite to the initial service transmission direction;

The second node is configured to receive the service of the protection label encapsulating the PW, and release the protection label of the PW, so that the service is normally recognized.

10. The system of claim 9 wherein said system further comprises one or more An intermediate node, the intermediate node is configured to transparently transmit the service according to the PW label of the service.

The system according to claim 9, wherein the first node comprises: a protection encapsulation unit, configured to protect a PW protection label of the service when a failure occurs; Forwarding the service of the PW-encapsulated protection label in a direction opposite to the initial service transmission direction.

The system of claim 9, wherein the second node comprises: a service receiving unit, configured to receive the service of the PW-encapsulated protection tag;

The protection release unit is configured to release the protection label of the PW, so that the service is normally recognized.

13. A ring network node, characterized by comprising:

And a service sending unit, configured to send the service of the PW-encapsulated protection label in a direction opposite to an initial service sending direction.