Method, system, device and medium for automatically generating SNC and SNC route based on service circuit
Through the collection and topological restoration of service information of OTN devices, the automatic generation and update of SNC and SNC routing data is achieved, which solves the problem that it is difficult to automatically confirm data after the device carries services, improves management efficiency, and meets the needs of digital management.
Patent Information
- Application Number
- CN202411855238.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2044-12-17
AI Technical Summary
In the transmission network OTN device, after the device carries services, it is difficult for users or upper-level management systems to automatically confirm the service SNC and SNC routing data, resulting in time-consuming manual inspection and difficult to achieve digital management.
By collecting equipment business information, restoring the service topology and conducting internal link judgments, judging the service link integrity, generating or replicating SNC, and generating SNC routes based on the service type and connection cross type, automatic processing and management of service data is realized.
It realizes that after the OTN equipment carries services, it automatically generates and updates SNC and SNC routing data, simplifies service management and monitoring, improves data processing efficiency, and meets the needs of digital management.
Smart Images

Figure CN119835205A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of transport network OTN equipment service management and processing, and in particular to a method, system, equipment and medium for automatically generating SNC and SNC routing based on service circuits. Background Art
[0002] With the evolution of transmission network technology, access OTN equipment from different manufacturers has been put into production and application in the market. After the equipment carries the service, users or upper-layer management systems need to pay attention to the correctness of the service SNC and SNC routing, and the integrity of the data, which is especially important in the automatic concatenation application of data automatic processing service data.
[0003] In order to meet the market demand for cost reduction and efficiency improvement in the development of equipment hardware and the construction of vendor network management support functions for small OTN equipment in the access segment, it is ensured that the equipment can be put into production and application as long as it can carry business functions. Due to the development of informatization and digitalization, if the upper-layer system or user wants to confirm the service SNC or SNC routing data after the equipment carries the business, there are certain differences in the evolution goals of informatization and digital management due to the lack of or failure to provide basic equipment data. If you want to confirm the service SNC and routing data, you need to manually check and output it or use customized development methods to ensure that all equipment manufacturers have generated all data before providing data to the upper-layer system. In this process, the manual troubleshooting method has a large amount of data, which is time-consuming, and the customized method has a wide impact range and difficulty in unifying standards. It is necessary to unify and automatically process SNC and SNC routing to meet the business in digital management. Summary of the invention
[0004] The purpose of the present invention is to provide a method, system, device and medium for automatically generating SNC and SNC routing based on service circuits, so as to meet the formation of data at various levels in the service model involved in the access type OTN equipment after issuing the service, and facilitate the management and monitoring of service data.
[0005] To achieve the above purpose, the technical solution provided by the present invention is:
[0006] A first aspect of the present application provides a method for automatically generating an SNC and an SNC route based on a service circuit, comprising the following steps:
[0007] Issue services to different devices so that the devices can carry services; collect device service information;
[0008] Restore the service topology and make intra-service link determination;
[0009] Determine whether the service link is complete. If it is complete, check whether there are shared ports or resources. If it is incomplete, return to restore the service topology and perform intra-service link determination.
[0010] In the case of shared ports or resources, the SNC of the corresponding level of the shared resources does not need to be generated repeatedly. In the case of no shared ports or resources, a new SNC is generated;
[0011] Generate relevant service resources and SNC according to service type and connection cross type; generate SNC routing for the service;
[0012] If the service changes, the service topology is restored and the link judgment within the service is performed before continuing with the next step. If the service does not change, the step is completed.
[0013] To optimize the above technical solutions, the specific measures taken also include:
[0014] When the device is delivering services to the device in the device management and control system or the device is already carrying services, the device service information is collected to obtain the service's CONNECTION, CTP, FTP, PG, and PTP. Based on the PTP port of the device under the service, the service topology can be restored through the network topology to determine the integrity of the link within the service.
[0015] Furthermore, if the service link is incomplete, it can be known that there are other devices in the service to be sent down, and at this time, continue to wait for the link to be judged complete; if the link is complete, it can be known whether it is a terminated complete service or an unterminated complete service; at the same time, according to the service data resources, it can be known whether there are multiplexed ports and multiplexed time slots in the service. If so, the SNC of the same level does not need to be generated again. If not, it is generated according to the new SNC in the subsequent logic. At this point, the SNC of all levels under the service can be generated, and the SNC of the unterminated service direction is also an unterminated situation. In the terminated situation, the SNC of each segment is complete data.
[0016] Furthermore, after the SNC is stored, the SNC routing data of the respective level SNC is sequentially generated according to the SNC related to the service by using the lower layer SNC data and combining the CTP, FTP, PG, and PTP data.
[0017] Furthermore, based on known business information, the business type, business data cross-class, port objects at both ends of the CONNECTION connection and the associated or bound data relationship are automatically identified, and then the corresponding SNCs are automatically generated based on the business granularity matching relationship between interconnected devices; SNC routes are automatically generated based on SNC and SNC service layer.
[0018] Furthermore, based on changes in existing network services, the service topology is restored dynamically according to changes in service data and the steps of determining links within the service are performed, so that the service link can continue to execute subsequent steps, thereby realizing automatic updating of SNC and SNC routing data in the event of service changes.
[0019] This application enables the business data to automatically generate relevant business resources for the characteristic types of the business data through business-related cross-connection CONNECTION data and the corresponding CTP, FTP, PG, PTP, and topology data, based on the premise that the business topology link is complete.
[0020] A second aspect of the present application provides a system for automatically generating SNC and SNC routing based on a service circuit, including:
[0021] The service delivery module is used to deliver services to different devices so that the devices can carry the services;
[0022] Business collection module, used to collect equipment business information;
[0023] The link judgment module is used to restore the service topology and judge the links within the service, and check whether there are shared ports or resources. If there are shared ports or resources, the corresponding hierarchical SNC of the shared resources does not need to be generated repeatedly. If there are no shared ports or resources, a new SNC needs to be generated.
[0024] The SNC generation module is used to automatically identify the service type, service data cross-class, port objects at both ends of the CONNECTION connection and the associated or bound data relationship based on the known service information, and then automatically generate the corresponding SNC based on the service granularity matching relationship between the interconnected devices;
[0025] An SNC route generation module is used to automatically generate SNC routes based on SNC and the service layer of SNC;
[0026] The service change processing module is used to dynamically restore the service topology and perform the service link judgment step based on the changes in the existing network services, so that the service links can continue to execute the subsequent steps;
[0027] The system is used to execute the above-mentioned method for automatically generating SNC and SNC routing based on service circuit.
[0028] The third aspect of the present application provides an electronic device, characterized in that it includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for automatically generating SNC and SNC routing based on the service circuit as described above is implemented.
[0029] A fourth aspect of the present application provides a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the method for automatically generating an SNC and an SNC route based on a service circuit as described above.
[0030] Compared with the prior art, the present invention has the following beneficial effects:
[0031] The present invention can restore the service topology through the network topology according to the PTP port of the equipment under the service, and judge the link integrity within the service. On the premise of the integrity of the service topology link, the characteristic type of the service data is automatically generated by the cross-connection CONNECTION data related to the service and the corresponding CTP, FTP, PG, PTP, and topology data, thereby satisfying the formation of various levels of data in the service model involved in the access OTN equipment after the service is issued, and facilitating the management and monitoring of the service data.
[0032] The method of the present invention supports the management of services related to access-type OTN equipment of the same manufacturer or different manufacturers, and reports or collects equipment CONNECTION connection, crossover, PTP, CTP, FTP, and PG objects after the services are issued.
[0033] The present invention automatically identifies the service type, service data cross type, port objects at both ends of the CONNECTION connection and the associated or bound data relationship based on known service information, and then automatically generates the corresponding SNCs based on the service granularity matching relationship between interconnected devices; the present invention automatically generates SNC routing based on SNC and the service layer of SNC.
[0034] The present invention can be compatible with the sharing of SNC and SNC routes in different service resource reuse scenarios, and realize fast query or resource reporting of service SNC and SNC routes; the present invention can be compatible with automatic regeneration of SNC and SNC routes when service data changes. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 : A flow chart of a method for automatically generating SNC and SNC routing based on a service circuit of the present invention.
[0036] Figure 2 : In a specific implementation manner of the present invention, a reference model diagram for data generation when the access-type OTN device carries services of EOO, EOS, and OTN.
[0037] Figure 3 : In a specific implementation manner of the present invention, a reference model diagram for data generation when the access type OTN device carries services of EOOSU and OSU.
[0038] Figure 4 : In a specific implementation manner of the present invention, a data generation model diagram is shown when the access type OTN equipment carries services of pure Ethernet, Ethernet with cross-connection, pure EOS, and mixed use with the final carrying to the OTN interface. DETAILED DESCRIPTION
[0039] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the above contents of the present invention belong to the scope of the present invention.
[0040] Some of the terms in the present invention are explained as follows:
[0041] PTP: Physical port.
[0042] CTP: Connection Port.
[0043] FTP: Floating port.
[0044] PG: Protection group.
[0045] CONNECTION: Business connection.
[0046] In one embodiment of the present invention, a method for automatically generating SNC and SNC routing based on service circuit is proposed, such as Figure 1 As shown, the following steps are included:
[0047] Issue services to different devices so that the devices can carry services; collect device service information;
[0048] Restore the service topology and make intra-service link determination;
[0049] Determine whether the service link is complete. If it is complete, check whether there are shared ports or resources. If it is incomplete, return to restore the service topology and perform intra-service link determination.
[0050] In the case of shared ports or resources, the SNC of the corresponding level of the shared resources does not need to be generated repeatedly. In the case of no shared ports or resources, a new SNC is generated;
[0051] Generate relevant service resources and SNC according to service type and connection cross type; generate SNC routing for the service;
[0052] If the service changes, the service topology is restored and the link judgment within the service is performed before continuing with the next step. If the service does not change, the step is completed.
[0053] The present invention supports the automatic generation of SNC and SNC routes of related services after the service management sends the configuration of access OTN equipment of the same manufacturer or different manufacturers. The equipment type included in the service automatically determines whether there is a fiber optic transceiver. If the service has a fiber optic transceiver type device, the data starts from the fiber optic transceiver. If there is no fiber optic transceiver, the data starts from the location of the CPE under the service.
[0054] The overall service types include EOO, EOS, OTN, OSU, and EOOSU, which are standard OTN bearer modes on the line side that can be uploaded and carried by access OTN equipment, as well as non-standard services of the complete class on the client side port of a single device, or service types composed of such non-standard and standard mixed modes. After the service is created, each level of SNC automatically identifies its own AZ port based on the relevant service data. The service resource data automatically generates cc crossover when the CONNECTION connection type is sdh, odu, and osu, and automatically generates mfdfr when the CONNECTION connection type is eth. Each type of service automatically generates SNCs at each level starting from the service layer until the TL level according to the service type, and the SNC routes of each level of SNC are automatically connected and generated based on the SNC of the lower layer. Finally, the complete SNC and SNC routing data of the service are formed.
[0055] Combination Figure 1 The process from service creation to SNC and SNC route automatic generation in the present invention is described in detail.
[0056] When the equipment is issued a service in the equipment control system or the equipment is already carrying a service, the equipment service information can be collected to obtain the service's CONNECTION, CTP, FTP, PG, and PTP. The service topology data can be obtained from PTP and the network topology, and the link data of the service can be restored. It can be judged whether the service link is complete. If it is not complete, it can be known that there are other devices in the service to be issued, and at this time, it continues to wait for the link to be judged complete. If the link is complete, it can be further known whether it is a terminated complete service or an unterminated complete service. At the same time, according to the service data resources, it can be known whether there are multiplexed ports, multiplexed time slots, etc. in the service. If so, the SNC of the same level does not need to be generated again. If not, it is generated according to the new SNC in the subsequent logic. At this point, the SNC of all levels under the service can be generated, and the SNC of the unterminated service direction is also unterminated. In the case of termination, the SNC of each section is complete data.
[0057] After the SNC is stored, the SNC routing data of the respective level SNCs can be generated in sequence according to the lower-level SNC data and combined with the CTP, FTP, PG, PTP, and PG data according to the relevant SNCs under the service.
[0058] If the existing network service needs to be replaced due to necessary reasons such as equipment abnormality, the service topology is restored dynamically according to the changes in the service data and the link judgment steps within the service are performed. That is, when the service link changes from complete to incomplete and then becomes complete again, the subsequent steps are automatically executed to realize the automatic update of SNC and SNC routing data in the event of service changes.
[0059] In some embodiments, in combination Figure 2 The data generation reference model for the access-type OTN device in the present invention when the service types carried are EOO, EOS, and OTN is described in detail.
[0060] After the service is created, you can know all the connection information under the service. When the eth connection is used, the mfdfr is automatically generated, and when the sdh, odu, and osu connections are used, the cc crossover is automatically generated. Similarly, according to the type of physical port involved in the service, if the client-side port is ETH, you can know that the corresponding service starts from the Ethernet port, such as Figure 2 The left and middle views in the figure show that the CTP associated with the PTP of ETH can directly generate FDFR. The generation is based on whether the current service is a half circuit, then an unterminated FDFR is generated; if it is a complete circuit, then an ongoing FDFR is generated. The lower layer SNC is L2link. If the client side port is ODU, then it can be known that the corresponding service is an OTN service, such as Figure 2 From the right view, the CTP associated with the PTP of this ODU can directly generate a DSR. The generation is based on the current service. If it is a half circuit, an unterminated DSR is generated. If it is a complete circuit, a DSR in progress is generated. Figure 2 In the left view, the next layer generates SNC at the ODU0 or ODUflex level based on the service granularity EOO service. Since the small vendors' equipment for the access segment almost all has 10G ports, the next layers are ODU2, OTU2, OCH, and TL. Figure 2 When the intermediate view is EOS, vc-level SNC continues to be generated. If it is a low-order cross, vc4server continues to be generated, and the lower layers are MS, RS, ODU0 / ODU1, ODU2, OTU2, OCH, and TL. Figure 2 If the right side view is OTN, then continue to generate ODU0 / ODU1 / ODUflex / ODU2. If the current layer is ODU0 / ODU1 / ODUflex, then the lower layers are ODU2, OTU2, OCH, TL. If it is directly ODU2, the lower layers are OTU2, OCH, TL. So far, the SNC in the common EOO, EOS, and OTN scenarios of access OTN services is completely generated. The SNC reason of each layer is automatically generated based on all SNCs of the same layer of the lower layer and service layer combined with the corresponding mfdfr, cc, and pg data.
[0061] In some embodiments, in combination Figure 3 The data generation reference model in the case where the access OTN equipment in the present invention carries services of EOOSU and OSU is described in detail.
[0062] After the service is created, you can know all the connection information under the service. When the eth connection is used, the mfdfr is automatically generated, and when the sdh, odu, and osu connections are used, the cc crossover is automatically generated. Similarly, according to the type of physical port involved in the service, if the client-side port is ETH, you can know that the corresponding service starts from the Ethernet port, such as Figure 3 From the left view in the figure, the CTP associated with the PTP of ETH can directly generate FDFR. The generation is based on whether the current service is a half circuit, then an unterminated FDFR is generated. If it is a complete circuit, then an ongoing FDFR is generated. The lower layer SNC is L2link. If the client side port is OSU, then it can be known that the corresponding service is an OSU service, such as Figure 3 From the right view, the CTP associated with the PTP of the OSU can directly generate a CLIENT. The generation is based on the current service. If it is a half-circuit, an unterminated CLIENT is generated. If it is a complete circuit, a CLIENT in progress is generated. The next lower layer is OSUflex, ODU0 / flex / 2. If the current layer is ODU0 / ODUflex, the lower layers are ODU2, OTU2, OCH, and TL. If it is directly ODU2, the lower layers are OTU2, OCH, and TL. At this point, the SNC in the EOOSU and OSU scenarios is completely generated. The SNC reason for each layer is automatically generated based on all SNCs of the same layer of the lower layer, that is, the service layer, combined with the corresponding mfdfr, cc, and pg data.
[0063] In some embodiments, in combination Figure 4 The data generation in the case where the access type OTN equipment in the present invention carries services of pure Ethernet, Ethernet with cross-connection, pure EOS and mixed use with the final carrying to the OTN interface is described in detail.
[0064] After the service is created, all connection information under the service can be known. If a single device in the service has both upper and lower ports as client-side ports, that is, not an OTN port, then mfdfr is still automatically generated according to the eth connection, and cc crossover is automatically generated for sdh, odu, and osu connections. If it is a pure Ethernet service for a single device, the SNC level ends at L2link. If it is a pure EOS service, that is, when there is a cc crossover, then the relevant vc-level SNC is generated. If the service is a multi-device interconnection situation, that is, when the client-side ports of two devices are connected, then all kinds of situations are compatible at the same time. Relevant SNC data is generated according to the actual service internal data, level, connection relationship, and whether the service circuit is terminated or unterminated. Here, the real AZ end port of the service end to the port will be judged at the same time. Similarly, the SNC route refers to all SNCs of the same layer of the lower layer, that is, the service layer, and then combines the corresponding mfdfr, cc, and pg data to automatically generate.
[0065] In another embodiment, the present invention provides a system for automatically generating SNC and SNC routing based on service circuits, including:
[0066] The service delivery module is used to deliver services to different devices so that the devices can carry the services;
[0067] Business collection module, used to collect equipment business information;
[0068] The link judgment module is used to restore the service topology and judge the links within the service, and check whether there are shared ports or resources. If there are shared ports or resources, the corresponding hierarchical SNC of the shared resources does not need to be generated repeatedly. If there are no shared ports or resources, a new SNC needs to be generated.
[0069] The SNC generation module is used to automatically identify the service type, service data cross type, port objects at both ends of the CONNECTION connection and the associated or bound data relationship based on the known service information, and then automatically generate the corresponding SNC based on the service granularity matching relationship between the interconnected devices;
[0070] An SNC route generation module is used to automatically generate SNC routes based on SNC and the service layer of SNC;
[0071] The service change processing module is used to dynamically restore the service topology and perform the service link judgment step based on the changes in the existing network services, so that the service links can continue to execute the subsequent steps;
[0072] The system is used to execute the above-mentioned method of automatically generating SNC and SNC routing based on service circuit.
[0073] The third aspect of the present application provides an electronic device, characterized in that it includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method of automatically generating SNC and SNC routing based on the service circuit as described above is implemented.
[0074] A fourth aspect of the present application provides a computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the above method for automatically generating an SNC and an SNC route based on a service circuit.
[0075] In the embodiments disclosed in the present application, the computer storage medium can be a tangible medium that can contain or store a program for use by or in conjunction with an instruction execution system, device or equipment. The computer storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the above. More specific examples of computer storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.
[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.
Claims
1. A method for automatically generating SNC and SNC routing based on service circuits, characterized in that: The following steps are involved: Issue services to different devices so that the devices can carry the services; Collect equipment business information; Restore the service topology and make intra-service link determination; Determine whether the service link is complete. If it is complete, check whether there are shared ports or resources. If it is incomplete, return to restore the service topology and perform intra-service link determination. In the case of shared ports or resources, the SNC of the corresponding level of the shared resources does not need to be generated repeatedly. In the case of no shared ports or resources, a new SNC is generated; Generate relevant business resources and SNC based on business type and connection cross type; Generate SNC routes for services; If the service changes, the service topology is restored and the intra-service link judgment is performed, so that the SNC and SNC routing data can be automatically updated in the event of service changes.
2. The method for automatically generating SNC and SNC routing based on service circuit according to claim 1, characterized in that: When the device is delivering services to the device in the device management and control system or the device is already carrying services, the device service information is collected to obtain the service's CONNECTION, CTP, FTP, PG, and PTP. Based on the PTP port of the device under the service, the service topology can be restored through the network topology to determine the integrity of the link within the service.
3. The method for automatically generating SNC and SNC routing based on service circuit according to claim 2, characterized in that: If the service link is incomplete, it can be known that there are other devices in the service to be sent down, and at this time, continue to wait for the link to be judged complete; if the link is complete, it can be known whether it is a terminated complete service or an unterminated complete service; at the same time, according to the service data resources, it can be known whether there are multiplexed ports and multiplexed time slots in the service. If so, the SNC of the same level does not need to be generated again. If not, it is generated according to the new SNC in the subsequent logic. At this point, the SNC of all levels under the service can be generated, and the SNC of the unterminated service direction is also an unterminated situation. In the terminated situation, the SNC of each segment is complete data.
4. The method for automatically generating SNC and SNC routing based on service circuit according to claim 3, characterized in that: After the SNC is stored, the SNC routing data of the respective level SNC is generated in sequence according to the lower layer SNC data and combined with the CONNECTION, CTP, FTP, PG, and PTP data according to the relevant SNC under the service.
5. The method for automatically generating SNC and SNC routing based on service circuit according to claim 1 or 4, characterized in that: Automatically identify the service type, service data cross type, port objects at both ends of the CONNECTION connection, and associated or bound data relationships based on known service information, and then automatically generate the corresponding SNCs based on the service granularity matching relationship between interconnected devices; automatically generate SNC routes based on SNC and SNC service layer.
6. The method for automatically generating SNC and SNC routing based on service circuit according to claim 1, characterized in that: Based on changes in existing network services, the service topology is restored dynamically according to changes in service data, and the steps of determining links within the service are performed, so that the service links can continue to execute subsequent steps, thereby achieving automatic update of SNC and SNC routing data in the event of service changes.
7. The method for automatically generating SNC and SNC routing based on service circuit according to claim 1, characterized in that: Based on the premise that the business topology link is complete, the business data can automatically generate relevant business resources for the characteristic types of the business data through the business-related cross-connection CONNECTION data and the corresponding CTP, FTP, PG, PTP, and topology data.
8. A system for automatically generating SNC and SNC routing based on service circuits, characterized in that: include: The service delivery module is used to deliver services to different devices so that the devices can carry the services; Business collection module, used to collect equipment business information; The link judgment module is used to restore the service topology and judge the links within the service, and check whether there are shared ports or resources. If there are shared ports or resources, the corresponding hierarchical SNC of the shared resources does not need to be generated repeatedly. If there are no shared ports or resources, a new SNC needs to be generated. The SNC generation module is used to automatically identify the service type, service data cross type, port objects at both ends of the CONNECTION connection and the associated or bound data relationship based on the known service information, and then automatically generate the corresponding SNC based on the service granularity matching relationship between the interconnected devices; An SNC route generation module is used to automatically generate SNC routes based on SNC and the service layer of SNC; The service change processing module is used to dynamically restore the service topology and perform the service link judgment step based on the changes in the existing network services, so that the service links can continue to execute the subsequent steps; The system is used to execute the method for automatically generating SNC and SNC routing based on service circuits according to any one of claims 1 to 7.
9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for automatically generating SNC and SNC routing based on a service circuit as described in any one of claims 1 to 7 is implemented.
10. A computer-readable storage medium storing a computer program, wherein the computer program enables a computer to execute the method for automatically generating SNC and SNC routing based on a service circuit according to any one of claims 1 to 7.
Citation Information
Patent Citations
Path generation method and device in optical transmission network
CN114301793A
Methods and systems for the hierarchical mesh restoration of connections in an automatically switched optical network
US20100054731A1
Resource configuration method and device
WO2015113298A1
Failure protection method, device and system for ring protection link
WO2016116050A1