WO2014180448A1

WO2014180448A1 - Method and device for protecting ptn network service

Info

Publication number: WO2014180448A1
Application number: PCT/CN2014/079990
Authority: WO
Inventors: 陈捷; 欧雪刚; 于洪宾; 罗伟; 李兴明
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-12-20
Filing date: 2014-06-16
Publication date: 2014-11-13
Also published as: CN104734950A; CN104734950B

Abstract

The present invention discloses a method and device for protecting PTN network service, and relates, within communication network planning and design, to PTN network service planning technology based on P-cycle protection. The method comprises: traversing each service within a PTN network service grouping, establishing a service path for said each service route, and obtaining N service routes corresponding to N services; configuring, for each link within each service path of each of the N service paths, a protective ring suitable for multiple services; establishing two protection paths for already-configured protective rings of any link through which multiple service paths of the N service paths pass, and causing said two protection paths to respectively provide protection to the link service groupings of said protective rings. The present invention advantageously utilizes indivisible characteristics of PTN service flow and high-efficiency P-ring protection to configure two protection path P-ring protection for crossover links, thus increasing network bandwidth utilization rates.

Description

TECHNICAL FIELD The present invention relates to the technical field of combining network planning technology and computer application, and particularly relates to a PTN network service planning technology based on P-cycle protection in communication network planning and design, that is, A planning method and apparatus for improving the network bandwidth utilization by ensuring that the services in the PTN network satisfy the P-cycle protection while minimizing the configured P-cycle demand capacity and providing the greatest protection capability. BACKGROUND OF THE INVENTION Packet Transport Network (PTN) is a new generation of packet-based, connection-oriented multi-service transmission technology, which not only can better carry carrier-class Ethernet services, but also takes into account traditional experimental data management/technical data. Management (TDM: Testing Data Management/Technical Data Management) business. In the metropolitan area network of China's operators, the PTN technology is mainly located in the aggregation access layer of the metropolitan area. The main services carried by the network are: Second/third generation mobile communication technology (2 _n d/3rd-gener _a tion) Base station service , Group line and Internet major customer business, internal business (DCN: Data Communication Network and IPTV (Internet Protocol Television)) Optical line terminal (OLT: Optical Line Terminal) WLAN (WLAN: Wireless Local Area Networks) A variety of high-quality packet services such as environmental monitoring. Therefore, once a link or node fails in the network, a large amount of services will be interrupted, causing huge losses. P-cycle: Preconfigured protection cycle, which has the ability to protect both links on the P-ring and across the link. On the PTN network, the P-circle configured for the LSP (Label Switch Path) is the LSP bidirectional tunnel ring. As the scale of business grows, the survivability of the network becomes more and more important. In addition, the increase in bandwidth requirements makes the bandwidth resources of the network more tense. This forces us to consider the bandwidth utilization while considering the survivability of PTN network services. SUMMARY OF THE INVENTION An object of the present invention is to provide a method and a device for protecting a PTN network service, which can solve the problem that the service bandwidth on the link cannot be effectively protected when the link fails, resulting in low network bandwidth utilization. problem. According to an embodiment of the present invention, a method for protecting a PTN network service is provided, including: Traversing each service in the PTN network service set, establishing a service path for each of the service routes, and obtaining N service paths corresponding to N services; each link in each of the N service paths Configuring a protection circle suitable for multiple services; establishing two protection paths for the configured protection circle of any link through which multiple service paths pass through the N service paths, so that the two protection paths respectively belong to the chain of the protection circle The road business collection provides protection. Preferably, each link in each of the service paths is sorted in descending order according to the used working bandwidth from large to small, and each link is traversed in sequence; and the preset protection circle database is used to find Outing all the protection rings of each link, and calculating the working bandwidth required for each protection ring and its own redundancy rate; all the protections are performed according to the redundancy ratio from small to large. The circle sequentially determines to obtain the protection ring of each link. Preferably, the all protection rings are sequentially determined according to the redundancy ratio from small to large, and the protection ring of each link is obtained: the working bandwidth required for each protection ring to be configured And comparing with the remaining bandwidth of the link of the protection ring; if the remaining bandwidth of the link is greater than the working bandwidth required to configure the protection ring, determining that the protection ring is a protection ring of the link. Preferably, the method further includes: deleting a protection ring including the part of the link if a part of the link of the protection ring exists; reconfiguring the link to be protected in all the protection rings that are deleted , get a protection circle suitable for multiple business. Preferably, the two protection paths are established, and the two protection paths respectively provide protection for the link service set of the protection circle, including: dividing two independent protection paths from the configured protection circle; The link service set of the protection circle is divided, and two sub-service sets whose service working bandwidths are equal or similar are obtained; The two sub-service sets are separately configured to the two independent protection paths. Preferably, the working bandwidth required for configuring each protection ring is the maximum value of the sum of service working bandwidths in the two sub-service sets. According to another embodiment of the present invention, an apparatus for protecting a PTN network service is provided, including: a service path module, configured to traverse each service in a PTN network service set, and establish a service for each service route The path is configured to obtain N service paths corresponding to the N services; the configuration module is configured to configure a protection ring suitable for multiple services for each link in each of the N service paths; the switching configuration module is set to Two protection paths are established for the configured protection ring of any one of the N service paths, and the two protection paths respectively provide protection for the link service collection of the protection circle. Preferably, the configuration module includes: a traversal sub-module, configured to perform a descending ordering of each link in each of the service paths in descending order of used working bandwidth, and sequentially traverse each of the links a link sub-module, configured to find all the protection rings including each of the links from the preset protection circle database, and calculate the working bandwidth required for configuring each protection ring and its own redundancy The determining sub-module is configured to sequentially determine all the protection rings according to the redundancy ratio from small to large, to obtain the protection ring of each link. Preferably, the device further includes: a reconfiguration sub-module, configured to delete all protection rings including the partial link if a part of the link of the protection ring has a protection ring, and need to delete all the protection rings The protected link is reconfigured to obtain a protection circle suitable for multiple services. Preferably, the switching configuration module includes: a protection circle dividing sub-module, configured to divide two independent protection paths from the configured protection circle; and the set dividing sub-module is set as a link service to the protection ring The set is divided into two sub-service sets whose service working bandwidths are equal or similar; The protection protection sub-module is configured to separately configure the two sub-service sets to the two independent protection paths. Compared with the prior art, the beneficial effects of the embodiments of the present invention are as follows: P-cycle protection is provided for the working LSP of the service, and the configured P-cycle can be used for the failed link, for the inseparable feature of the PTN service traffic. Provides approximately 2 times more efficient protection, effectively improving the utilization of network bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a method for protecting a PTN network service according to an embodiment of the present invention; FIG. 2 is a device structure of a P-cycle based PTN network service for protecting a PTN network service according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a P-circle operation and protection switching for protecting a PTN network service according to an embodiment of the present invention; FIG. 4 is a flowchart of a method for protecting a PTN network service according to an embodiment of the present invention; The PTN network topology diagram for protecting the PTN network service provided by the embodiment of the present invention; FIG. 6 is a service information diagram for protecting the PTN network service according to the embodiment of the present invention; and FIG. 7 is a PTN provided by the embodiment of the present invention. P-cycle plan for network service protection. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. When the PTN network is planned, designed, and optimized according to the present invention, the PTN network has the following features: (1) The PTN network topology is known according to actual applications, including the number of nodes and the connectivity of nodes.

(2) For the bandwidth requirements of the service, each network node has the ability to fully allocate wavelengths.

(3) The PTN network device has a control plane, so that the service working path is switched to the protection path under the affected condition.

(4) The P circle in the network refers to the LSP tunnel protection ring. The specific rules and related parameters of the PTN network service routing involved in the present invention are as follows: (1) Specific rules:

The PTN network service is directed, and the uplink and downlink services are not necessarily symmetric. The Dijkstra shortest path algorithm with directed weighted graph is used in routing and establishing working LSP. (2) Related parameters: The network topology can be represented by a directed graph G (N, E). According to the actual application, the topology is known, the links between nodes are known, and the bandwidth is known. The relevant parameters are as follows:

N: N is the set of node devices, n=|N|, which is the number of nodes.

E: Network link set, d=|£| is the number of links, there can be multiple links between nodes. Chain routing between connected nodes consists of two fiber links with opposite transmission directions.

M: indicates the fiber collection, M ₂ , ..., M , m indicates the number of fibers in the network. Since there may be multiple links between nodes, m=2d.

T: Service set (here assumed to be a P-cycle protected service), T={T _X , Τ ₂ , ..., T _c , and c are arbitrary constants, indicating the number of services. T _f : P-cycle protects the service set that the design fails (including the service that fails to establish a working LSP).

T _s : Configure the P-cycle successful service collection.

P _a : Network P circle database.

P _s : A set of P-circles for routing service configurations in the network.

P _Li : Contains the P circle set of link A. E(i): The redundancy ratio of the circle.

Wp: The link through which all LSPs of the routed service work are initialized to null. FIG. 1 is a schematic diagram of a method for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 1 , the specific steps are as follows: Step SI: traverse each service in the PTN network service set, establish a service path for each service route, and obtain N service paths corresponding to N services. Step S2: configuring a protection ring suitable for multiple services for each link in each of the N service paths. In step S2, each link in each of the service paths is sorted in descending order according to the used working bandwidth from large to small, and each link is traversed in sequence; from the preset protection circle database Finding all the protection rings including each of the links, and calculating the working bandwidth required for configuring each protection ring and its own redundancy rate; according to the order of the redundancy ratio from small to large All the protection rings are judged in turn to obtain the protection ring of each link. Further, the all protection rings are sequentially determined according to the redundancy ratio from small to large, and the protection ring of each link is obtained: the working bandwidth required for each protection ring is configured. And comparing with the remaining bandwidth of the link of the protection ring; if the remaining bandwidth of the link is greater than the working bandwidth required to configure the protection ring, determining that the protection ring is a protection ring of the link. Further, if a part of the link of the protection ring has a protection ring, all the protection rings including the part of the link are deleted; and the links to be protected in all the protection rings that are deleted are reconfigured to obtain a service suitable for multiple services. Protection ring. In the step S3, two protection paths are established for the configured protection ring of any one of the multiple service paths in the N service paths, so that the two protection paths respectively provide protection for the link service set of the protection ring. Further, the step of establishing two protection paths, so that the two protection paths respectively provide protection for the link service set of the protection circle includes: dividing two independent protection paths from the configured protection circle And dividing the link service set of the protection circle to obtain two sub-service sets whose service work bandwidths are equal or similar to each other; and configuring the two sub-service sets to the two independent protection paths respectively. Further, the working bandwidth required for configuring each protection circle is the maximum value of the sum of service working bandwidths in the two sub-service sets. 2 is a structural diagram of an apparatus for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 2, the method includes: a service path module, a configuration module, and a switching configuration module. The service path module is configured to traverse each service in the PTN network service set, establish a service path for each service route, and obtain N service paths corresponding to N services. The configuration module is configured to configure a protection ring suitable for multiple services for each of each of the N service paths. The traversal sub-module of the configuration module is configured to perform descending ordering on each link in each service path according to the used working bandwidth from large to small, and traverse the each link in sequence. The calculation sub-module of the configuration module is configured to find all the protection rings including the each link from the preset protection circle database, and calculate the working bandwidth required for configuring each protection circle and its own redundancy. The rate. The determining sub-module of the configuration module is configured to sequentially determine all the protection rings according to the redundancy ratio from small to large, to obtain a protection ring of each link. The reconfiguration sub-module of the configuration module is configured to delete all the protection rings that include the part of the link if a part of the link of the protection ring has a protection ring, and re-protect the link that needs to be protected in all the protection rings that are deleted. Configure it to get a protection circle suitable for multiple services. The switching configuration module is configured to establish two protection paths for the configured protection ring of any one of the plurality of service paths in the N service paths, so that the two protection paths respectively link the service to the protection ring Collections provide protection. The protection circle division sub-module of the switching configuration module is configured to divide two independent protection paths from the configured protection circle. The set dividing sub-module of the switching configuration module is configured to divide the link service set of the protection circle, and obtain two sub-service sets whose service working bandwidths are equal or similar. The allocation protection sub-module of the switching configuration module is configured to separately configure the two sub-service sets to the two independent protection paths. FIG. 3 is a schematic diagram of a P-circle operation and a protection switching for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 3, a thick line is a configured P-ring uplink link (ABCDEFA). Figure 3 (a) shows the operation of the PTN network service on the P-ring bridging link BE. Figure 3 (b) shows the switching mode of the P-circle to protect the affected PTN network service when the BE link fails. As shown in Figure 3 (a), the working capacity (unit: Mbps) is marked on the link, and the working bandwidth of the uplink and downlink fibers on the ring is the same. For example, the working bandwidth of the uplink and downlink fibers of the AB link is 5M each. At the bridging link BE, the EB dotted arrow indicates the working traffic on the fiber from the node E to the B direction, and (6, 1) indicates that the traffic consists of services with bandwidths of 1, 6, respectively. Similarly, the BE dotted arrow indicates the working traffic on the fiber from the Node B to the E direction, and (4, 5, 3) indicates that the traffic consists of services with bandwidths of 3, 4, and 5 respectively. The policy of configuring the P-circle is as follows: The link with the largest working bandwidth is used as the spanning link, and then the service bandwidth set on this link is divided into two sets with the same sum of bandwidths. . When this link fails, the traffic of the two sets can be protected by two paths on the P circle. In Figure 3 (a), the set of service bandwidths carried by the fiber in the BE direction is (3, 4, 5). When the BE link fails, as shown by the dotted arrow in Figure 3 (b), the traffic of the bandwidth (3, 4) (that is, the total bandwidth is 7M) is protected by the BAFE, and the traffic with the bandwidth of 5 is protected by the BCDE. . The sum of the working bandwidths of the EB direction fibers is 7M, which is protected by the EFAB. Through this strategy, we can protect the ring and crossover links by configuring 7M bandwidth for the P circle. FIG. 4 is a flowchart of a method for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps: Step 401: According to a network topology, construct a minimum P-circle and a service level by using an algorithm based on K shortest path. The SLA (Service-Level Agreement) algorithm builds a P-circle database (including basic and extended circles). Sort the services in the set T by priority. Step 402: Traverse the services in the set 依次 in turn, and if all the services have been processed, the algorithm ends. Step 403: Establish a working LSP for the service route. If the service route fails, join the set 7>, and return to step 402. If the route is successful, the working LSP is established, the link through which the LSP passes is added to the set, and then the links are sorted in descending order according to the used working bandwidth. Step 404: Traverse the links of the processing set in sequence, if all the links have been processed, the newly added services; if the P-circle protection can be performed, the set 7 will be added; and the process returns to step 402. Step 405: According to the P-circle database, find all P-circles including the unprocessed link J, and record them as a set ^. Calculate the bandwidth and redundancy required for each P-ring in ^, and then take out the P-ring with the smallest redundancy rate, and the selected P-circle is recorded as. Among them, the bandwidth of the P circle uses the method of calculating the P-circle bandwidth in Figure 3 (b). Step 406: View the remaining bandwidth of the ring fiber. If the remaining bandwidth of the optical fiber is smaller than the bandwidth required for configuring the P-circle, another P-circle ₊₁ with a larger redundancy ratio is taken, and then it is determined whether the remaining capacity of the optical fiber in the P-ring is satisfied. Until a circle of capacity is found in the set ^. If such a P circle is not found, the new service of the P circle cannot be configured; adding 7>, restoring the set, and returning to step 402; if there is such a circle S, adding the circle to the set, deleting the circle found by the circle Protected links, updating the remaining bandwidth of all fibers in the circle. If some links have P-circle protection in the set, record the protected link set as L, delete all P-rings of the protected link set in A, and update the deleted P-ring link capacity for deletion. In the P circle, the service working link that needs to be protected is configured with P-circle protection, and the configured P-ring is added. Returning to step 404. Among them, the P-ring redundancy rate is defined as the ratio of the network capacity consumed by the configuration circle A to the actual protected working capacity. The redundancy rate is calculated as follows:

E(k) = , where S _w represents the capacity consumed to configure the P-ring on the fiber link

Amount, _w represents a work flow can be protected on the P-ring links, J P represents the ring A n all fish Zhu FIG. 5 is an optical fiber link PTN PTN network traffic to protect a network according to an embodiment of the present invention The topology diagram, as shown in Figure 5, represents a node in the network topology. There are 8 nodes in total. The link is two opposite fibers, and the fiber bandwidth is 10G. FIG. 6 is a service information diagram for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 6, the service information of the P circle needs to be configured in the planning software. The service information includes a source node, a destination node, a protection mode, and a bandwidth of the service. FIG. 7 is a P-cycle planning diagram for protecting a PTN network service according to an embodiment of the present invention. As shown in FIG. 7, the P-cycle planning capacity and configuration node, the specific steps of the P-cycle planning are as follows: Step 701: Establish a PTN network topology diagram initially shown in FIG. 5, with a ray bandwidth of 10 G, and having known service information of services to be carried by the PTN network in FIG. 6. Step 702: The services in the aggregation group include PW1, PW2, and PW3, and the service PW1 is routed, and the working LSP is established, and the link through which the LSP passes is added to the set. The link that is arranged in descending order of the used working bandwidth is: Η-Α, Α-Β, Β-Ε. Step 703: According to the pre-calculated circle database ^. Find the configuration ring containing link Η-Α, BP HGBAH, HGBEFAH, HGBCDEFAH. Calculate the bandwidth required for each P-ring configuration and the redundancy rate of each P-ring itself. Find the P-ring with the smallest redundancy from all P-circles. In fact, the redundancy rate of HGBAH and P HGBEFAH is equal to 2. That is, HGBAH's E (k, =1200M/600M=2, HGBEFAH's £(Α)=1800Μ/900Μ=2. However, from the perspective of the optimal loop, HGBEFAH can protect the links HA, AB, BE three chains at the same time. Therefore, HGBEFAH is configured as the P circle of the service PW1, and the service PW1 planning ends. The capacity of the HGBEFAH is 300M. Step 704: Add the P circle to the set of ABCDEFA, and delete the links HA, AB, BE protected by the found P circle HGBEFAH in f _A , and update the remaining bandwidth of the light of the P circle HGBEFAH. Step 705: Continue to configure the P circle for the service WP2, and obtain the ₂ link as the BE. Configure a P-ring for the _2- link BE, and a _2- link BE for the spanning link, and get the P-circle as ABCDEFA. Therefore, ABCDEFA is the configuration P circle of the service PW2, the service PW2 planning ends, and the capacity of the ABCDEFA is 500M. Step 706: The partial links AB and BE of the configuration P circle of the Wp ₂ link BE are already in the configured P circle HGBEFAH in the set, and the set of the protected links AB and BE is recorded as . Delete the P-band HGBEFAH of the protected link AB and BE in the set, and update the bandwidth of the deleted P-circle HGBEFAH link. Then, reconfigure the P-circle for the link HA of the service PW1 to be protected in the deleted P-ring HGBEFAH, and obtain the configured P-circle as HGBAH, and join the set. Among them, the capacity of HGBAH is 300M. Step 707: Continue to configure the P circle for the service WP3, and obtain the ₃ links as GB and BE. According to the order of the used working bandwidth from the largest to the smallest, the P-ring is configured for the _3- link BE, and the _3- link BE is the spanning link, and the P-circle is ABCDEFA. The capacity of the updated P circle ABCDEFA is 600M. Step 708: Configure a P-circle for the _3- link GB, and obtain a P-circle as HGBAH and a capacity of 300M. The business WP3 planning ends, and the P circle is configured as ABCDEFA and HGBAH. The P circle generated by the final plan of the business WP1, WP2 and WP3 and its capacity are P1 circle (ABCDEFA, 600M) and P P2 circle (HGBAH, 300M). The present invention has been proposed in the process of designing a PTN packet transmission network planning software, but it can be applied to other types of network planning processes as long as it is modified. In summary, the present invention has the following technical effects: It can utilize the indivisible characteristics of the PTN service traffic and the high efficiency of the P-circle protection, and configure the P-circle protection of the two protection paths for the cross-link, thereby improving the network bandwidth. Utilization rate. At the same time, the protection method is applicable to the dynamic addition of services at the same time, and the utility of the invention is expanded. Although the invention has been described in detail above, the invention is not limited thereto, and various modifications may be made by those skilled in the art in accordance with the principles of the invention. Therefore, modifications made in accordance with the principles of the invention should be construed as falling within the scope of the invention. Industrial Applicability The above technical solution provided by the present invention can be applied to the process of protecting a PTN network service, and traversing each service in the PTN network service set, and establishing a service path for each service route, which is obtained corresponding to N service paths of N services; configure a protection ring suitable for multiple services for each link in each of the N service paths; and have passed any link of multiple service paths in the N service paths The configuration of the protection circle, the establishment of two protection paths, and the two protection paths respectively provide protection for the link service set of the protection circle, and the beneficial effects are: for the inseparable characteristics of the PTN service traffic, for the service The working LSP provides P-cycle protection, and the configured P-cycle can provide approximately 2 times more efficient protection for the failed link, effectively improving the utilization of the network bandwidth.

Claims

Claim

1. A method of protecting a PTN network service, including:

Traversing each service in the PTN network service set, establishing a service path for each service route, and obtaining N service paths corresponding to N services;

Configuring a protection ring suitable for multiple services for each link in each of the N service paths; establishing two protections for the configured protection ring of any of the links in the N service paths The path is such that the two protection paths respectively provide protection for the link service set of the protection circle.

The method according to claim 1, wherein the configuring a protection ring suitable for multiple services for each link in each of the N service paths includes:

Each link in each of the service paths is sorted in descending order according to the used working bandwidth from large to small, and each link is traversed in sequence;

Find all the protection rings containing each of the links from the preset protection circle database, and calculate the working bandwidth required for each protection ring and its own redundancy rate;

The protection loops are sequentially determined in the order of the redundancy ratio from small to large, and the protection loop of each link is obtained.

The method according to claim 2, wherein the determining, by the order of the redundancy ratio, the protection rings are sequentially determined, and obtaining the protection circle of each link includes:

The working bandwidth required to configure each protection ring is sequentially compared with the remaining bandwidth of the link of the protection ring;

If the remaining bandwidth of the link is greater than the working bandwidth required to configure the protection ring, it is determined that the protection circle is a protection ring of the link.

The method according to claim 2 or 3, further comprising: if a part of the link of the protection ring has a protection ring, deleting all the protection rings including the part of the link; The link that needs to be protected is reconfigured to obtain a protection circle suitable for multiple services. The method according to any one of claims 2 to 4, wherein the establishing two protection paths, so that the two protection paths respectively provide protection for the link service set of the protection circle includes:

Separate two separate protection paths from the configured protection circle;

The link service set of the protection circle is divided, and two sub-service sets whose service working bandwidths are equal or similar are obtained;

The two sub-service sets are separately configured to the two independent protection paths. The method according to any one of claims 2, 3 and 5, wherein the required working bandwidth for each guard ring is the maximum value of the sum of the service working bandwidths of the two sub-service sets. An apparatus for protecting a PTN network service, comprising: a service path module, configured to traverse each service in a PTN network service set, establish a service path for each service route, and obtain N pieces corresponding to N services Business path

a configuration module, configured to configure a protection ring suitable for multiple services for each link in each of the N service paths;

The switching configuration module is configured to establish two protection paths for the configured protection ring of any one of the plurality of service paths in the N service paths, so that the two protection paths respectively form a link service set for the protection circle. Provide protection. The device according to claim 7, wherein the configuration module comprises:

The traversing sub-module is configured to perform a descending ordering of each link in each of the service paths in order of decreasing working bandwidth, and traversing each of the links in sequence;

a calculation sub-module, configured to find all the protection rings including each link from the preset protection circle database, and calculate the working bandwidth required for each protection circle and its own redundancy rate; The sub-module is configured to sequentially determine all the protection rings according to the redundancy ratio from small to large, and obtain the protection ring of each link. The device according to claim 8, further comprising: a reconfiguration submodule, configured to delete all protection rings including the partial link if a protection ring exists on a part of the links of the protection ring, for deleting The links that need to be protected in all protection rings are reconfigured to obtain a protection circle suitable for multiple services. The apparatus according to claim 7, wherein the switching configuration module comprises: The protection circle division sub-module is set to divide two independent protection paths from the configured protection circle;

The set partitioning sub-module is configured to divide the link service set of the protection circle, and obtain two sub-service sets whose service working bandwidths are equal or similar;

The protection protection sub-module is configured to separately configure the two sub-service sets to the two independent protection paths.