CN113285871A

CN113285871A - Link protection method, SDN controller and communication network system

Info

Publication number: CN113285871A
Application number: CN202010102168.9A
Authority: CN
Inventors: 尹远阳; 叶和亮; 卢泉; 杨广铭; 邢亮; 蓝双凤
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2020-02-19
Filing date: 2020-02-19
Publication date: 2021-08-20
Anticipated expiration: 2040-02-19
Also published as: CN113285871B

Abstract

The disclosure provides a link protection method, an SDN controller and a communication network system. The SDN controller collects the reported information of each router in the network; after SD alarm information reported by the alarm router is received, path planning is carried out again according to a preset strategy so that the generated protection path can avoid a link associated with the alarm router; and sending the path tunnel information of the protection path to an ingress router of the network, so that the ingress router switches the original path to the protection path according to the path tunnel information. The method and the device can realize uniform link detection protection under the scene of common networking of multiple manufacturers.

Description

Link protection method, SDN controller and communication network system

Technical Field

The present disclosure relates to the field of communications, and in particular, to a link protection method, an SDN controller, and a communication network system.

Background

As communication networks evolve, users become more concerned about network quality of service. Therefore, network link failure detection and fast handover are of high interest to the industry.

Currently, for the problem of SD (Signal degradation) Link detection handover, related technologies mainly include Link Layer Discovery Protocol (LLDP) extension detection based on Frame Check Sequence (FCS), Resource Reservation Protocol (RSVP) notification header node, and the like.

Disclosure of Invention

The inventor finds that the existing telecommunication network is commonly networked by a plurality of manufacturers and the technical standards adopted by the manufacturers are not uniform, so that in the networking scene of telecommunication operators and different manufacturers, the SD link detection technology of the proprietary factory can only be adopted to perform segmented detection among the devices of the same manufacturer, the problems that the SD detection and the end-to-end protection of the link cannot be realized by the butt-joint link of the different manufacturers, and the like are caused, and the popularization of services and the improvement of the quality of network services are not facilitated.

Accordingly, the present disclosure provides a scheme capable of monitoring SD alarm information in a network to implement link protection, so as to implement uniform link protection in the entire network.

According to a first aspect of the embodiments of the present disclosure, there is provided a link protection method, including: collecting the reported information of each router in the network; after SD alarm information reported by an alarm router is received, path planning is carried out again according to a preset strategy so that the generated protection path can avoid a link associated with the alarm router; and sending the path tunnel information of the protection path to an entrance router of the network, so that the entrance router can switch the original path to the protection path according to the path tunnel information.

In some embodiments, signal degradation SD alarm information reported by each router in a network is collected through a path computation element communication protocol PCEP; and sending the path tunnel information of the protection path to the ingress router through the PCEP.

In some embodiments, after the SD alarm information disappears, it is determined whether the SD alarm information reported by the alarm router is received within a preset time range; and if the SD warning information reported by the warning router is not received within a preset time range, sending a path recovery instruction to the entrance router so that the entrance router can switch the protection path to the original path.

In some embodiments, a deep learning model is used to analyze the reported information of each router in the network so as to sense the state of each router; and executing a step of re-planning the path according to a preset strategy at the router which senses that the state abnormality exists in the network.

According to a second aspect of the embodiments of the present disclosure, there is provided an SDN controller, including: the acquisition module is configured to acquire the reported information of each router in the network; the route planning module is configured to perform route planning again according to a preset strategy after receiving the SD alarm information reported by the alarm router so that the generated protection route can avoid a link associated with the alarm router; a sending module, configured to send the path tunnel information of the protection path to an ingress router of the network, so that the ingress router switches an original path to the protection path according to the path tunnel information.

In some embodiments, the acquisition module is configured to acquire signal degradation SD alarm information reported by each router in a network through a path computation element communication protocol PCEP; and the sending module sends the path tunnel information of the protection path to the ingress router through the PCEP.

In some embodiments, the path planning module is further configured to determine whether SD alarm information reported by the alarm router is received within a preset time range after the SD alarm information disappears; the sending module is further configured to send a path restoration instruction to the ingress router if the SD alarm information reported by the alarm router is not received within a preset time range, so that the ingress router switches the protection path to an original path.

In some embodiments, the path planning module is further configured to analyze the reported information of each router in the network by using a deep learning model to sense the state of each router, and execute an operation of re-planning a path according to a predetermined policy when the router in which the state abnormality is sensed exists in the network.

According to a third aspect of the embodiments of the present disclosure, there is provided an SDN controller, including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method implementing any of the embodiments described above based on instructions stored by the memory.

According to a fourth aspect of the embodiments of the present disclosure, there is provided a communication network system including the SDN controller according to any of the embodiments, and a plurality of routers including an ingress router of a network, wherein: a plurality of routers configured to report information to the SDN controller; an ingress router configured to switch an original path to a protection path according to path tunnel information of the protection path sent by the SDN controller.

In some embodiments, the ingress router is further configured to switch the protection path to an original path according to a path restoration instruction sent by the SDN controller.

According to a fifth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, in which computer instructions are stored, and when executed by a processor, the computer-readable storage medium implements the method according to any of the embodiments described above.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a flow diagram of a link protection method according to one embodiment of the present disclosure;

fig. 2 is a flow diagram of a link protection method according to another embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a link protection framework according to one embodiment of the present disclosure;

figure 4 is a schematic structural diagram of an SDN controller according to one embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of an SDN controller according to another embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a communication network system according to one embodiment of the present disclosure.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials and values set forth in these embodiments are to be construed as illustrative only and not as limiting unless otherwise specifically stated.

The use of the word "comprising" or "comprises" and the like in this disclosure means that the elements listed before the word encompass the elements listed after the word and do not exclude the possibility that other elements may also be encompassed.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Fig. 1 is a flow diagram of a link protection method according to one embodiment of the present disclosure. In some embodiments, the following link protection method steps are performed by an SDN (Software Defined Network) controller.

In step 101, reporting information of each router in the network is collected.

In step 102, after the SD alarm information reported by the alarm router is received, path planning is performed again according to a predetermined policy, so that the generated protection path can avoid the link associated with the alarm router.

In some embodiments, the SDN controller establishes a PCEP (Path computing Element Communication Protocol) control session connection with each router in the network, so as to collect SD alarm information reported by each router in the network through the PCEP Protocol.

It should be noted here that the router sends the SD alarm information in case of discovering that the link associated with the router fails.

In step 103, the path tunnel information of the protection path is sent to an ingress router of the network, so that the ingress router switches the original path to the protection path according to the path tunnel information.

In some embodiments, the path tunnel information of the protection path is sent to the ingress router (i.e., the network head node) via the PCEP protocol.

In the link protection method provided by the above embodiment of the present disclosure, path protection and switching are performed according to SD alarm information reported by each router in a network, so that uniform link detection protection is realized in a scenario of common networking of multiple manufacturers.

Fig. 2 is a flow diagram of a link protection method according to another embodiment of the disclosure. In some embodiments, the following link protection method steps are performed by the SDN controller.

In step 201, report information of each router in the network is collected.

In step 202, after the SD alarm information reported by the alarm router is received, path planning is performed again according to a predetermined policy, so that the generated protection path can avoid the link associated with the alarm router.

In some embodiments, SD alarm information reported by each router in the network is collected through the PCEP protocol.

In step 203, the path tunnel information of the protection path is sent to an ingress router of the network, so that the ingress router switches the original path to the protection path according to the path tunnel information.

In step 204, after the SD alarm information disappears, it is determined whether the SD alarm information reported by the alarm router is received within a preset time range.

In step 205, if the SD alarm information reported by the alarm router is not received within the preset time range, the path restoration instruction is sent to the ingress router, so that the ingress router switches the protection path to the original path.

If the SD alarm information reported by the alarm router disappears and does not appear in the preset time range, the SD alarm information indicates that the path fault associated with the alarm router is eliminated, and the SD alarm router can be switched back to the original path under the condition.

In some embodiments, the state of each router is sensed by analyzing the reported information of each router in the network by using a deep learning model. And if the router with abnormal state in the network is sensed, executing the step of planning the path again according to a preset strategy.

For example, the deep learning model may be CNN (Convolutional Neural Network). The deep learning model is trained by using the information reported by the relevant routers in the network and the sample data of the corresponding link faults, so that the trained deep learning model can quickly sense the network state according to the information reported by each router in the network, and can carry out corresponding link planning and switching, thereby effectively improving the service guarantee capability.

Fig. 3 is a schematic diagram of a link protection framework according to one embodiment of the present disclosure.

As shown in fig. 3, the current traffic path is path 31, i.e., R0-R1-R2-R5. The SDN controller collects the reported information of each router, and determines that a link between the routers R1 and R2 has a fault according to SD alarm information reported by the routers R1 and R2. In this case, the SDN controller re-performs path planning, and the determined new path may be path 32, i.e. R0-R1-R3-R4-R5, or path 33, i.e. R0-R3-R4-R5. The SDN controller sends information (SR-BE (Segment Routing-Best Effort)/SE-TE (Segment Routing-Traffic Engineering)) about the new path to the network head node R0 so that R0 switches the Traffic path to the determined path 32 or path 33.

If the link between the routers R1 and R2 fails to recover, the SD alarm information is not reported by the R1 and R2 any more. After a preset time has elapsed to confirm that the link failure between routers R1 and R2 has recovered, the SDN controller sends a path restoration instruction to head node R0. The head node takes the path 31 as the current traffic path again according to the path restoration instruction.

Fig. 4 is a schematic structural diagram of an SDN controller according to an embodiment of the present disclosure. As shown in fig. 4, the SDN controller includes an acquisition module 41, a path planning module 42, and a sending module 43.

The collection module 41 is configured to collect report information of each router in the network.

In some embodiments, the collecting module 41 is configured to collect SD alarm information reported by each router in the network through the PCEP protocol.

The path planning module 42 is configured to, after receiving the SD alarm information reported by the alarm router, re-perform path planning according to a predetermined policy so that the generated protection path can avoid the link associated with the alarm router.

The sending module 43 is configured to send the path tunnel information of the protection path to an ingress router of the network, so that the ingress router switches the original path to the protection path according to the path tunnel information.

In some embodiments, the sending module 43 sends the path tunnel information of the protection path to the ingress router through the PCEP protocol.

In some embodiments, the path planning module 42 is further configured to determine whether the SD alarm information reported by the alarm router is received within a preset time range after the SD alarm information disappears.

The sending module 43 is further configured to send a path restoration instruction to the ingress router if the SD alarm information reported by the alarm router is not received within the preset time range, so that the ingress router switches the protection path to the original path.

In some embodiments, the path planning module 42 is further configured to analyze the reported information of each router in the network by using a deep learning model, so as to sense the state of each router, and execute an operation of performing path planning again according to a predetermined policy when the router that senses that the state is abnormal in the network exists.

Fig. 5 is a schematic structural diagram of an SDN controller according to another embodiment of the present disclosure. As shown in fig. 5, the SDN controller includes a memory 51 and a processor 52.

The memory 51 is used to store instructions. The processor 52 is coupled to the memory 51. The processor 52 is configured to perform a method according to any of the embodiments of fig. 1 and 2 based on the instructions stored in the memory.

As shown in fig. 5, the SDN controller further includes a communication interface 53 for information interaction with other devices. Meanwhile, the SDN controller further includes a bus 54, and the processor 52, the communication interface 53, and the memory 51 complete communication with each other through the bus 54.

The Memory 51 may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM). Such as at least one disk storage. The memory 51 may also be a memory array. The storage 51 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.

Further, the processor 52 may be a central processing unit, or may be an ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement embodiments of the present disclosure.

The present disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores computer instructions, and the instructions, when executed by the processor, implement the method according to any one of the embodiments of fig. 1 and 2.

Fig. 6 is a schematic structural diagram of a communication network system according to one embodiment of the present disclosure. As shown in fig. 6, the communication network system includes an SDN controller 60 and a plurality of routers 61-6n, where the router 61 is an ingress router (i.e., a network head node) of the network. The SDN controller 60 is the SDN controller according to any one of the embodiments in fig. 4 or fig. 5.

The router 61-6n will report its own state information to the SDN controller 60. Wherein a router sends SD alarm information if it finds that its associated link has failed.

The ingress router 61 is configured to switch the original path to the protection path according to the path tunnel information of the protection path sent by the SDN controller 60.

Furthermore, the ingress router 61 is further configured to switch the protection path to the original path according to a path restoration instruction sent by the SDN controller 60.

By implementing the present disclosure, the following advantageous effects can be obtained:

uniformly sensing by an SDN controller, uniformly analyzing and calculating, and isolating a detection mechanism defined by a manufacturer and a private definition;

the SD detection accuracy is high, a global network link view is provided, the defects of experience values can be effectively reduced through centralized control of an SDN controller, and service popularization and network service quality are facilitated.

So far, embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A link protection method, comprising:

collecting the reported information of each router in the network;

after SD alarm information reported by an alarm router is received, path planning is carried out again according to a preset strategy so that the generated protection path can avoid a link associated with the alarm router;

and sending the path tunnel information of the protection path to an entrance router of the network, so that the entrance router can switch the original path to the protection path according to the path tunnel information.

2. The method of claim 1, wherein,

acquiring signal degradation SD alarm information reported by each router in a network through a PCEP (protocol for computing element communication);

and sending the path tunnel information of the protection path to the ingress router through the PCEP.

3. The method of claim 1, further comprising:

after the SD alarm information disappears, judging whether the SD alarm information reported by the alarm router is received within a preset time range;

and if the SD warning information reported by the warning router is not received within a preset time range, sending a path recovery instruction to the entrance router so that the entrance router can switch the protection path to the original path.

4. The method of any of claims 1-3, further comprising:

analyzing the reported information of each router in the network by using a deep learning model so as to sense the state of each router;

and if the router with the abnormal state in the network is sensed, executing a step of re-planning the path according to a preset strategy.

5. An SDN controller comprising:

the acquisition module is configured to acquire the reported information of each router in the network;

the route planning module is configured to perform route planning again according to a preset strategy after receiving the SD alarm information reported by the alarm router so that the generated protection route can avoid a link associated with the alarm router;

a sending module, configured to send the path tunnel information of the protection path to an ingress router of the network, so that the ingress router switches an original path to the protection path according to the path tunnel information.

6. The controller of claim 5,

the acquisition module is configured to acquire signal degradation SD alarm information reported by each router in a network through a path computation element communication protocol PCEP;

and the sending module sends the path tunnel information of the protection path to the ingress router through the PCEP.

7. The controller of claim 5,

the path planning module is also configured to judge whether the SD warning information reported by the warning router is received within a preset time range after the SD warning information disappears;

the sending module is further configured to send a path restoration instruction to the ingress router if the SD alarm information reported by the alarm router is not received within a preset time range, so that the ingress router switches the protection path to an original path.

8. The controller of any one of claims 5-7,

the path planning module is also configured to analyze the reported information of each router in the network by using a deep learning model so as to sense the state of each router, and if the router with abnormal state in the network is sensed, the operation of re-planning the path is executed according to a preset strategy.

9. An SDN controller comprising:

a memory configured to store instructions;

a processor coupled to the memory, the processor configured to perform implementing the method of any of claims 1-4 based on instructions stored by the memory.

10. A communication network system comprising the SDN controller of any one of claims 5-9, and a plurality of routers comprising an ingress router of a network, wherein:

a plurality of routers configured to report information to the SDN controller;

an ingress router configured to switch an original path to a protection path according to path tunnel information of the protection path sent by the SDN controller.

11. The system of claim 10, wherein,

the ingress router is further configured to switch the protection path to an original path according to a path restoration instruction sent by the SDN controller.

12. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-4.