WO2023024924A1

WO2023024924A1 - Routing switching method, node, routing device and storage medium

Info

Publication number: WO2023024924A1
Application number: PCT/CN2022/111795
Authority: WO
Inventors: 安航; 张明超; 朱晓宇; 赵志勇
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-08-24
Filing date: 2022-08-11
Publication date: 2023-03-02
Also published as: CN115720123A

Abstract

A routing switching method, a node, a routing device and a storage medium. The routing switching method comprises: if it is determined that an operating state of a primary route changes to a fault state, sending a dispersion search range to a receiving end such that the receiving end communicates service data with the sending end via a standby route, where a dispersion compensation parameter applied at the receiving end is obtained by the receiving end performing dispersion search on the standby route within the dispersion search range (S110).

Description

Routing switching method, node, routing device, storage medium

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202110975361.8 and a filing date of August 24, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to but not limited to the field of optical communication, and in particular relates to a routing switching method, a node, a routing device, and a storage medium.

Background technique

Automatically Switched Optical Network (ASON) is a new generation of optical network that completes automatic switching functions under routing and signaling control, and is the main development direction of Optical Transport Network (OTN) technology. In order to improve the reliability of ASON, a main route and a backup route are usually set up between the sending end and the receiving end to form a protection switching system. During normal operation, business transmission is performed through the main route, and protection switching is triggered after the main route fails. , and switch the service transmission to the standby route to ensure that the service can be restored quickly.

If the dispersion effect occurs in the optical fiber transmission link, and the transmission speed of the optical pulse signal reaches a certain level, it will adversely affect the operation of the ASON system. In order to solve this problem, dispersion compensation needs to be performed at the receiving end. The magnitude of the dispersion will be affected by the physical characteristics of the route, so the dispersion compensation parameters applicable to different routes are different. Dispersion compensation parameters need to be determined through dispersion search, but the current method needs to traverse all dispersion search ranges in the band, and the larger the search range, the longer the time spent. For the protection switching system, it is likely that the large dispersion search range will cause the protection switching to time out and affect the service recovery.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

Embodiments of the present application provide a route switching method, a node, a routing device, and a storage medium.

In the first aspect, the embodiment of the present application provides a routing switching method, which is applied to the main control node of ASON, and the main control node is connected to the sending end and the receiving end respectively, and the sending end and the receiving end are connected by communication. A primary route and a standby route for transmitting services are configured, and the route switching method includes: if it is determined that the operating state of the primary route changes to a fault state, sending a dispersion search range to the receiving end, so that the receiving end and the The sending end communicates service data through the backup route, wherein the dispersion compensation parameter applied by the receiving end is obtained by the receiving end performing a dispersion search on the backup route within the dispersion search range.

In the second aspect, the embodiment of the present application provides a routing switching method, which is applied to the sending end, the sending end is connected to the receiving end through communication, and the sending end and the receiving end are respectively connected to the main control node of ASON through communication, A primary route and a standby route for transmitting services are configured between the sending end and the receiving end, and the route switching method includes: communicating service data with the receiving end through the standby route, wherein the receiving end The dispersion compensation parameter applied by the end is obtained by the receiving end performing a dispersion search on the backup route within the dispersion search range, and the dispersion search range is determined by the master control node when the operating state of the main route is changed to a fault state In the case of sending to the receiving end.

In the third aspect, the embodiment of the present application provides a routing switching method, which is applied to the receiving end, and the receiving end is communicatively connected to the sending end, and the sending end and the receiving end are respectively connected to the main control node of ASON through communication, A primary route and a standby route for transmitting services are configured between the sending end and the receiving end, and the route switching method includes: obtaining a dispersion search range sent by the master control node, wherein the dispersion search range is determined by the The master control node sends when it is determined that the operating state of the main route is changed to a fault state; within the dispersion search range, perform a dispersion search for the backup route to obtain a dispersion compensation parameter; apply the dispersion compensation parameter , performing service data communication with the sending end through the standby route.

In a fourth aspect, an embodiment of the present application provides a master control node, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements the following when executing the computer program: The route switching method described in the first aspect.

In the fifth aspect, the embodiment of the present application provides a routing device, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor implements the following when executing the computer program. The routing switching method according to the second aspect; or, the routing switching method according to the third aspect is implemented when the processor executes the computer program.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the description, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present invention.

Fig. 1 is a flow chart of the routing switching method provided by one embodiment of the present invention;

FIG. 2 is a flow chart of determining that the main route is in a fault state provided by another embodiment of the present application;

Fig. 3 is a flow chart of determining the dispersion search range provided by another embodiment of the present application;

FIG. 4 is a flowchart of determining a dispersion reference value provided by another embodiment of the present application;

Fig. 5 is a flowchart of determining a dispersion reference value provided by another embodiment of the present application;

FIG. 6 is a flow chart of measuring the transmission delay of optical probe signals provided by another embodiment of the present application;

Fig. 7 is a flowchart of determining a dispersion reference value provided by another embodiment of the present application;

FIG. 8 is a flow chart of obtaining transmission delay provided by another embodiment of the present application;

FIG. 9 is a flow chart of saving reference dispersion values provided by another embodiment of the present application;

FIG. 10 is a schematic structural diagram of a sending end and a receiving end provided by another embodiment of the present application;

FIG. 11 is a flowchart of a route switching method provided in another embodiment of the present application;

Fig. 12 is a flowchart of determining a dispersion reference value provided by another embodiment of the present application;

FIG. 13 is a flowchart of a route switching method provided in another embodiment of the present application;

Fig. 14 is a flowchart of determining a dispersion reference value provided by another embodiment of the present application;

FIG. 15 is an apparatus diagram of a master control node provided by another embodiment of the present application;

Fig. 16 is an apparatus diagram of a routing device provided by another embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, it can be executed in a different order than the module division in the device or the flowchart in the flowchart steps shown or described. The terms "first", "second" and the like in the specification, claims or the above drawings are used to distinguish similar objects, and not necessarily used to describe a specific order or sequence.

The present application provides a route switching method, a node, a routing device, and a storage medium. The route switching method includes: if it is determined that the operating state of the main route has changed to a fault state, sending a dispersion search range to the receiving end, so that all The receiving end and the sending end perform service data communication through the standby route, wherein the dispersion compensation parameter applied by the receiving end is performed by the receiving end within the dispersion search range for the standby route. get. According to the solution provided by the embodiment of the present application, the dispersion search range can be configured for the receiving end without in-band traversal, which effectively reduces the time spent on dispersion search, thereby improving the switching efficiency of the standby route and reducing the timeout risk of protection switching. Ensure quick business recovery.

The embodiments of the present application will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 1 is a routing switching method provided by an embodiment of the present application, which is applied to the master control node of ASON. Configure the primary route and standby route for the transmission service, and the route switching methods include:

Step S110, if it is determined that the operating state of the main route is changed to a failure state, send the dispersion search range to the receiving end, so that the receiving end and the sending end can communicate service data through the backup route, wherein the dispersion compensation parameters applied by the receiving end are determined by the receiving end The terminal performs dispersion search on the standby route within the dispersion search range.

It should be noted that for an OTN network, the dispersion of the route usually depends on the physical characteristics of the optical fiber link. Therefore, when the optical fiber link of the route remains unchanged, the dispersion can also be considered the same. Based on this, through the master control node to the The receiving end distributes the dispersion search range, so that the receiving end can perform the dispersion search within a smaller range, thereby reducing the time spent on the dispersion search and improving the efficiency of route switching.

It should be noted that the dispersion search range can be preset or calculated according to the set routing parameters. Of course, it can also be measured before the dispersion search is performed at the receiving end. The specific acquisition method of the dispersion search range in this embodiment Not much to limit.

It should be noted that after the receiving end obtains the dispersion search range, those skilled in the art know how to complete the dispersion search and start the protection switching process, so as to realize switching from the primary route to the backup route, which will not be described in this embodiment.

In addition, with reference to Fig. 2, ASON is connected with the network management system in communication, and the transmission service is configured with a service identifier. In one embodiment, step S110 in the embodiment shown in Fig. 1 also includes but is not limited to the following steps:

Step S210, acquiring the fault information sent by the network management system, the fault information carrying the fault service identifier;

In step S220, if the service identifier of the transmission service matches the failure service identifier, it is determined that the operation state of the main route of the transmission service is changed to a failure state.

It should be noted that the fault detection of the main route can be completed by the network management system based on WDM/OTN Automatically Switched Optical Network (WDM/OTN Automatically Switched Optical Network, WASON, wherein, Wavelength Division Multiplexing, WDM) , if WASON detects a fault in the fiber link, determine the transmission service involved in the fiber link and obtain the service ID, add it as the fault service ID to the alarm information and send it to the master control node, thereby triggering the master control node to issue the dispersion search range .

It should be noted that the faulty service ID can be the business ID of the business, and the business ID can be in any form, such as a common business identity number (Identity document, ID). By determining the faulty service ID, the corresponding main The control node provides a judgment basis for subsequent determination of the standby route.

It should be noted that after the master control node obtains the faulty service ID, it can match the faulty service ID with the locally configured service ID to determine the transmission service that needs protection switching, so as to perform route switching.

In addition, referring to FIG. 3, in an embodiment, in step S110 in the embodiment shown in FIG. 1, before sending the dispersion search range to the receiving end, the method further includes:

Step S310, obtaining the reference dispersion value of the standby route;

Step S320, determining the dispersion search range according to the reference dispersion value and preset search conditions.

It should be noted that the reference dispersion value can be the value stored in the main control node in advance. If the main route of the transmission service fails, the corresponding reference dispersion value can be queried according to the service ID of the transmission service; it can also be the value in the main route In the case of a fault, it is obtained by measuring the standby route, and this embodiment does not limit the specific acquisition method of the reference dispersion value.

It should be noted that the reference dispersion value may be a specific value of dispersion. After obtaining the reference dispersion value, the dispersion search range may be determined according to preset search conditions. For example, according to the set threshold, the reference dispersion value is added to The upper limit of the dispersion search range is obtained by the threshold value, and the lower limit of the dispersion search range is obtained by subtracting the threshold value from the reference dispersion value, and the interval formed by the upper limit and the lower limit is used as the dispersion search range; value query to find out the corresponding dispersion search range; another example, pre-set the function expression, and substitute the reference dispersion value into the function expression to obtain a curve describing the dispersion value, and use the value range of the curve as the dispersion search range , those skilled in the art have the motivation to adjust the search conditions according to actual needs, and no more limitations are made here.

In addition, referring to FIG. 4, the transmission service is configured with a service identifier. In one embodiment, step S310 in the embodiment shown in FIG. 3 also includes but is not limited to the following steps:

Step S410, determining a reference dispersion value from pre-saved dispersion values according to the service identifier.

It should be noted that, since the optical fiber link of the route remains unchanged, the dispersion value can also be considered the same. Therefore, the reference dispersion value can be measured in advance for each standby route, so that in the case of failure of the main route The reference dispersion value can be obtained directly to determine the dispersion search range, which further improves the efficiency of determining the dispersion compensation parameters of the backup route.

In addition, referring to FIG. 5, in one embodiment, step S310 in the embodiment shown in FIG. 3 also includes but is not limited to the following steps:

Step S510, sending dispersion measurement information to the sending end, so that the sending end sends at least two optical probe signals to the receiving end, wherein the wavelengths of the at least two optical probe signals are different from each other;

Step S520, determine the transmission delay of the optical probe signal, and determine at least one transmission delay difference, where the transmission delay difference is the difference between the transmission delays of the two optical probe signals;

Step S530, obtaining the route length information of the standby route, and determining at least one dispersion coefficient, wherein the dispersion coefficient is obtained according to the transmission delay difference, the wavelength difference of the two optical probe signals corresponding to the transmission delay difference, and the route length information;

Step S540, determining a reference dispersion value according to at least one dispersion coefficient.

Those skilled in the art know that the optical probe signal is a probe signal that can simulate service signal light, and parameters such as the wavelength and bandwidth of the optical probe signal can be adjusted according to actual needs. The reference dispersion value can better simulate the actual transmission of service optical signals, so that the measured reference dispersion value has a better reference value.

It should be noted that the dispersion measurement information sent to the sending end may include specific measurement requirements, such as the number of optical probe signals to be sent, the wavelength of each optical probe signal, etc., which can trigger the sending end to send At least two optical probe signals are sufficient. It can be understood that the wavelength of the optical probe signal can be realized by adjusting the signal amplifier and signal adjuster at the sending end, and it only needs to make the wavelengths of the optical probe signals different from each other.

It should be noted that, as shown in Figure 6, the transmitting end and the receiving end shown in Figure 6 are provided with an optical transmission unit (Optical Transform Unit, OTU), and the transmitting end sends i wavelength distributions to the OUT of the receiving end through OUT as (λ ₁ , λ ₂ ···λ _i ), where i is a natural number greater than or equal to 2, since each optical probe signal will produce a dispersion effect in the process of optical fiber transmission, so according to the optical probe signal received by the receiving end .

It should be noted that the transmission delay of the optical probe signal can be determined by sending time information and receiving time information, and the acquisition of sending time information and receiving time information can be determined by the time stamp of the local timer, or by The form of modulating the optical label information in the signal is obtained. Those skilled in the art know how to obtain the sending time information and receiving time of the optical probe signal, and there is no limitation here. For example, as shown in _FIG . The sending time of the probe signal is t ₁₁ , and the receiving time is t ₁₂ , then the transmission delay is delay ₁ +offset=t ₁₂ -t ₁₁ , where delay is the link delay, and offset is the time deviation reference between the sending end and the receiving end The value can be determined by the configuration parameters of the sending end and the receiving end. Similarly, the sending time of the optical probe signal with a wavelength of λ ₂ is t ₂₁ , and the receiving time is t ₂₂ , then the transmission delay is delay ₂ +offset=t ₂₂ -t ₂₁ t, since the offset is a constant, the transmission delay difference Δt ₁ =delay ₁ -delay ₂ =(t ₁₂ -t ₁₁ )-(t ₂₂ -t ₂₁ ) of the two optical probe signals can be determined.

It should be noted that the route length information of the standby route depends on the length of the fiber link, and the length of the fiber link is usually fixed and known, so the route length information can be set in the master control node in advance, so that when calculating Direct access to use. After obtaining the transmission delay difference, the dispersion coefficient can be calculated by the following formula:

Where Δt ₁ is the transmission delay difference obtained above, L is the route length information λ ₁ and λ ₂ are the wavelengths of the two optical probe signals respectively.

It is worth noting that, referring to the above description, each dispersion coefficient requires the parameters of two optical probe signals to be determined, but it does not necessarily require two continuously sent optical probe signals. In different cases, the dispersion coefficient can be calculated by using any two optical probe signals, and details will not be described here.

It should be noted that after the dispersion coefficient is obtained, the dispersion coefficient can be directly used as the reference dispersion value. If there is a need to reduce the error, multiple dispersion coefficients can also be calculated and obtained by statistical means or by fitting the curve. The reference dispersion value can be estimated by the method, and the specific method can be selected according to the actual needs.

In addition, referring to FIG. 7, in one embodiment, step S540 in the embodiment shown in FIG. 5 also includes but is not limited to the following steps:

Step S710, if the number of dispersion coefficients is one, determine the dispersion coefficient as a reference dispersion value;

or,

Step S720, if there are at least two dispersion coefficients, fitting a dispersion curve according to the at least two dispersion coefficients, and estimating a reference dispersion value according to the dispersion curve.

It should be noted that after the reference dispersion value is obtained, the dispersion search range needs to be combined with the search conditions, so the reference dispersion value is the data basis for determining the dispersion search range, since the reference dispersion value is determined by the parameters of the two optical probe signals , there may be a certain error, and the number of dispersion coefficients can be adjusted according to the allowable range of the error. For example, when the allowable error is large, a dispersion coefficient can be calculated from two optical probe signals and directly determined as the reference dispersion For another example, when the accuracy of the dispersion search range is required to be high, multiple sets of optical probe signals can be selected to obtain multiple dispersion coefficients, and the dispersion curve can be fitted to estimate a more accurate reference dispersion value.

It should be noted that, after obtaining at least two dispersion coefficients, those skilled in the art know how to fit multiple values to obtain related curves, for example, establish a coordinate system with dispersion coefficients and wavelengths, and use the mathematical relationship between the two to obtain The dispersion curve, and the corresponding reference dispersion value is calculated by a statistical method, which is not limited in this embodiment.

In addition, referring to FIG. 8, in one embodiment, step S520 in the embodiment shown in FIG. 5 also includes but is not limited to the following steps:

Step S810, acquiring the sending time information and receiving time information of the optical probe signal;

Step S820, acquiring a time offset reference value between the sending end and the receiving end;

In step S830, the transmission delay is obtained according to the sending time information, receiving time information and time offset reference value.

It should be noted that the sending time information and receiving time information can be obtained through the local timer, for example, before the sending end sends the optical probe signal, the time stamp of the local timer is obtained as the sending time stamp and added to the optical probe signal After receiving the optical probe signal, the receiving end obtains the time stamp of the local timer as the receiving time stamp. Those skilled in the art are familiar with how to obtain the time stamp when the signal is sent and received, so I won’t go into details here.

It should be noted that the time offset reference value of the sending end and the receiving end can be determined during device configuration, and those skilled in the art are familiar with how to determine the time offset reference value between two routing devices, so details will not be repeated here.

It should be noted that, for the step of obtaining the transmission delay according to the sending time information, receiving time information and time offset reference value, reference may be made to the description of the embodiment shown in FIG. 5 , and details will not be repeated here.

In addition, referring to FIG. 9 , in one embodiment, after step S540 in the embodiment shown in FIG. 5 is executed, the following steps are also included but not limited to:

Step S910, acquiring the service identifier of the transmission service;

Step S920, establishing and saving the mapping relationship between the service identifier and the reference dispersion value.

It should be noted that the reference dispersion value may be pre-measured and stored at the master control node when the master route and the backup route are running normally, or it may be in the case of failure of the master route, in the case of the embodiment shown in Figure 5 After the steps are confirmed, save and select the specific method according to the actual situation.

It should be noted that after the dispersion reference is obtained, the mapping relationship is established with the service identifier as the identification condition, so that the reference dispersion value can be quickly obtained after the main route corresponding to the transmission service fails, and the efficiency of the dispersion search is improved.

In addition, in order to better illustrate the technical solution of the embodiment of the present application, a specific example is proposed below in conjunction with the structure shown in FIG. 10 , wherein, in the structure shown in FIG. 1030, where the light source 1010 may be an external light source, or an internal light source of the sending end 1020, which is not limited here. In addition, the sending end 1020 includes a first signal amplifier 1021 , a signal conditioner 1022 , at least two second signal amplifiers 1023 , and a first local timer 1024 ; the receiving end 1030 includes a second local timer 1031 .

If the network management system determines that protection switching is required, it will issue the recovery service ID to the master controllers of each node on the path. Enter the signal adjuster 1022, adjust the wavelength by the signal adjuster 1022, and then send the optical probe signal whose emission wavelength is _λ1 through the second signal amplifier 1023, and obtain the timestamp sent by the first local timer 1024, and the sending time is recorded as t ₁₁ , similarly send an optical probe signal with a wavelength of λ ₂ , and obtain the time stamp sent by the first local timer 1024, record the sending time as t ₁₂ , and receive the optical probe signal with a wavelength of λ ₁ at the receiving end 1030 Afterwards, the time stamp sent by the second local timer 1031 is obtained, and the receiving time is recorded as t ₂₁ , and the same is true. After receiving the optical probe signal with a wavelength of _λ2 , the receiving end 1030 obtains the time stamp sent by the second local timer 1031, and the receiving time is recorded as _t22 .

Calculate the transmission delay difference between λ ₁ and λ ₂ : △t ₁ =delay ₁ -delay ₂ =(t ₁₂ -t ₁₁ )-(t ₂₂ -t ₂₁ ), where delay ₁ is the light with wavelength λ ₁ The link delay of the probe signal satisfies delay ₁ + offset = t ₁₂ -t ₁₁ , delay ₂ is the link delay of the optical probe signal with a wavelength of λ ₂ , and satisfies delay ₂ + offset = t ₂₂ -t ₂₁ , offset It is the reference value of the time offset between the sending end and the receiving end.

Obtain the route length information L of the standby route, and calculate the dispersion coefficient corresponding to the group of optical probe signals:

Continue to adjust the signal adjuster 1022, test the dispersion coefficients D _i at different wavelengths λ _i , fit the obtained multiple D _i , obtain the dispersion curve, and estimate the reference dispersion value of the standby route according to the dispersion curve.

Upload the reference dispersion value and service ID to the network management system, and record and save it. At the same time, the dispersion search range is obtained and sent to the receiving end. The dispersion search is performed by the receiving end to achieve dispersion compensation, and the route of the transmission service is switched to the standby route.

In addition, referring to FIG. 11 , the embodiment of the present application also provides a route switching method, which is applied to the sending end. The sending end communicates with the receiving end. The receiving end is configured with a primary route and a standby route for transmitting services, and the route switching method includes but is not limited to the following steps:

Step S1110, communicate service data with the receiving end through the standby route, wherein the dispersion compensation parameters applied by the receiving end are obtained by the receiving end performing dispersion search on the standby route within the dispersion search range, and the dispersion search range is determined by the main control node Sent to the receiving end when the operating state of the route changes to a faulty state.

It should be noted that, the technical solution and principle of this embodiment can refer to the embodiment shown in Figure 1, the main difference is that the execution subject of this embodiment is the sending end, otherwise it is similar to the principle of the embodiment shown in Figure 1, For the sake of brevity, no further details are given here.

In addition, referring to FIG. 12 , in one embodiment, the dispersion search range is determined by the master control node according to the reference dispersion value and preset search conditions, and the method of obtaining the reference dispersion value includes but is not limited to the following steps:

Step S1210, acquiring dispersion measurement information sent by the master control node;

Step S1220, sending at least two optical probe signals to the receiving end, so that the master control node determines at least one transmission delay difference according to the transmission delay of the at least two optical probe signals, thereby determining at least one dispersion coefficient, and according to at least A dispersion coefficient determines the reference dispersion value, wherein the wavelengths of at least two optical probe signals are different from each other, the transmission delay difference is the difference between the transmission delays of the two optical probe signals, and the dispersion coefficient is based on the transmission delay difference, The wavelength difference and route length information of the two optical probe signals corresponding to the transmission time delay difference are obtained.

It should be noted that, the technical solution and principle of this embodiment can refer to the embodiment shown in Figure 5, the main difference is that the execution subject of this embodiment is the sending end, other than that the principle is similar to that of the embodiment shown in Figure 5, For the sake of brevity, no more details are given here.

In addition, referring to FIG. 13 , the embodiment of the present application also provides a routing switching method, which is applied to the receiving end. The receiving end communicates with the sending end. The receiving end is configured with a primary route and a standby route for transmitting services, and the route switching method includes but is not limited to the following steps:

Step S1310, acquiring the dispersion search range sent by the master control node, wherein the dispersion search range is sent by the master control node when it is determined that the operating state of the master route is changed to a fault state;

Step S1320, within the dispersion search range, perform a dispersion search for the standby route to obtain dispersion compensation parameters;

Step S1330, apply the dispersion compensation parameter, and communicate the service data with the sending end through the backup route.

It should be noted that, the technical solution and principle of this embodiment can refer to the embodiment shown in Figure 1, the main difference is that the execution subject of this embodiment is the receiving end, otherwise it is similar to the principle of the embodiment shown in Figure 1, For the sake of brevity, no more details are given here.

In addition, referring to FIG. 14 , in one embodiment, the dispersion search range is determined by the master control node according to the reference dispersion value and preset search conditions, and the method of obtaining the reference dispersion value includes but is not limited to the following steps:

Step S1410, acquiring at least two optical probe signals sent by the sending end, so that the master control node determines at least one transmission delay difference according to the transmission delays of at least two optical probe signals, so as to determine at least a dispersion coefficient, and determine the reference dispersion value according to the at least one dispersion coefficient, wherein the wavelengths of at least two optical probe signals are different from each other, and the transmission time delay difference is two optical probes The difference value of the transmission delay of the signal, the dispersion coefficient is obtained according to the transmission delay difference, the wavelength difference of the two optical probe signals corresponding to the transmission delay difference, and the route length information, the The optical probe signal is sent by the sending end after obtaining the dispersion measurement information sent by the master control node.

It should be noted that, the technical solution and principle of this embodiment can refer to the embodiment shown in Figure 5, the main difference is that the execution subject of this embodiment is the receiving end, otherwise it is similar to the principle of the embodiment shown in Figure 5, For the sake of brevity, no further details are given here.

In addition, referring to FIG. 15 , an embodiment of the present application also provides a master control node. The master control node 1500 includes: a memory 1510 , a processor 1520 , and a computer stored in the memory 1510 and capable of running on the processor 1520 program.

The processor 1520 and the memory 1510 may be connected through a bus or in other ways.

The non-transitory software programs and instructions required to implement the route switching method of the above-mentioned embodiment are stored in the memory 1510, and when executed by the processor 1520, the route switching method applied to the master control node 1500 in the above-mentioned embodiment is executed, for example , execute method step S110 in Fig. 1 described above, method step S210 to step S220 in Fig. 2, method step S310 to step S320 in Fig. 3, method step S410 in Fig. 4, method step S510 in Fig. 5 Go to step S540, method steps S710 to step S720 in FIG. 7 , method steps S810 to step S830 in FIG. 8 , method steps S910 to step S920 in FIG. 9 .

In addition, referring to FIG. 16 , an embodiment of the present application also provides a routing device. The routing device 1600 includes: a memory 1610 , a processor 1620 , and a computer program stored in the memory 1610 and operable on the processor 1620 .

The processor 1620 and the memory 1610 may be connected through a bus or in other ways.

The non-transitory software programs and instructions required to implement the routing switching method of the above-mentioned embodiment are stored in the memory 1610, and when executed by the processor 1620, the routing switching method applied to the routing device 1600 in the above-mentioned embodiment is executed, for example, Execute the method step S1110 in FIG. 11 described above, the method step S1210 to step S1220 in FIG. 12; or execute the method step S1310 to step S1330 in FIG. 13 and the method step S1410 in FIG. 14 described above.

The device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, an embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by a processor or a controller, for example, by the above-mentioned Execution by a processor in the embodiment of the master control node can cause the above-mentioned processor to execute the route switching method applied to the master control node in the above embodiment, for example, execute the method step S110 in FIG. 1 described above, and the method in FIG. 2 Method step S210 to step S220, method step S310 to step S320 in Fig. 3, method step S410 in Fig. 4, method step S510 to step S540 in Fig. 5, method step S710 to step S720 in Fig. 7, Fig. Steps S810 to S830 of the method in 8, and steps S910 to S920 of the method in FIG. The route switching method of the master control node, for example, executes the above method step S1110 in FIG. 11 and the method step S1210 to step S1220 in FIG. 12; or executes the method step S1310 to step S1330 in FIG. 13 described above, and Step S1410 of the method in 14. Those skilled in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware and an appropriate combination thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit . Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. permanent, removable and non-removable media. Computer storage media include but not limited to Random Access Memory (Random Access Memory, RAM), Read-Only Memory (Read-Only Memory, ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash memory or other memory technologies, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The embodiment of the present application includes: if it is determined that the operating state of the main route has changed to a fault state, sending the dispersion search range to the receiving end, so that the receiving end and the sending end perform service data exchange through the standby route communication, wherein the dispersion compensation parameter applied by the receiving end is obtained by the receiving end performing dispersion search on the backup route within the dispersion search range. According to the solution provided by the embodiment of the present application, the dispersion search range can be configured for the receiving end without in-band traversal, which effectively reduces the time spent on dispersion search, thereby improving the switching efficiency of the standby route and reducing the timeout risk of protection switching. Ensure quick business recovery.

The above is a specific description of several embodiments of the present application, but the present application is not limited to the above-mentioned embodiments, and those skilled in the art can also make various equivalent deformations or replacements without violating the spirit of the present application. Equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims

A routing switching method, applied to the main control node of the automatic switching optical network ASON, the main control node is connected with the sending end and the receiving end respectively, and the main control node of the transmission service is configured between the sending end and the receiving end Routing and backup routing, the routing switching method includes:

If it is determined that the operating state of the primary route is changed to a fault state, sending a dispersion search range to the receiving end, so that the receiving end and the sending end communicate service data through the backup route, wherein the The dispersion compensation parameter applied by the receiving end is obtained by performing dispersion search on the standby route within the dispersion search range by the receiving end.
The method according to claim 1, wherein said ASON is connected to a network management system in communication, said transmission service is configured with a service identifier, and the change of the operating state of said main route to a fault state is determined by the following manner:

Obtaining fault information sent by the network management system, where the fault information carries a fault service identifier;

If the service identifier of the transmission service matches the failure service identifier, it is determined that the running state of the main route of the transmission service is changed to a failure state.
The method according to claim 1, wherein, before sending the dispersion search range to the receiving end, the method further comprises:

Acquiring the reference dispersion value of the standby route;

The dispersion search range is determined according to the reference dispersion value and a preset search condition.
The method according to claim 3, wherein the transmission service is configured with a service identifier, and the acquiring the reference dispersion value of the standby route comprises:

The reference dispersion value is determined from pre-saved dispersion values according to the service identifier.
The method according to claim 3, wherein said acquiring the reference dispersion value of said standby route comprises:

sending dispersion measurement information to the sending end, so that the sending end sends at least two optical probe signals to the receiving end, wherein the wavelengths of at least two of the optical probe signals are different from each other;

determining the transmission delay of the optical probe signal, and determining at least one transmission delay difference, wherein the transmission delay difference is the difference between the transmission delays of the two optical probe signals;

Obtain the route length information of the standby route, and determine at least one dispersion coefficient, wherein the dispersion coefficient is based on the transmission delay difference and the wavelength difference between the two optical probe signals corresponding to the transmission delay difference and the route length information is obtained;

The reference dispersion value is determined according to the at least one dispersion coefficient.
The method according to claim 5, wherein said determining said reference dispersion value according to said at least one dispersion coefficient comprises:

If the number of the dispersion coefficient is one, determining the dispersion coefficient as the reference dispersion value;

or,

If there are at least two dispersion coefficients, fitting a dispersion curve according to at least two dispersion coefficients, and estimating the reference dispersion value according to the dispersion curve.
The method according to claim 5, wherein said determining the transmission delay of said optical probe signal comprises:

Acquiring the sending time information and receiving time information of the optical probe signal;

Acquiring a time offset reference value between the sending end and the receiving end;

The transmission delay is obtained according to the sending time information, the receiving time information and the time offset reference value.
The method according to claim 5, wherein, after said determining said reference dispersion value according to said at least one dispersion coefficient, said method further comprises:

Obtain the service identifier of the transmission service;

A mapping relationship between the service identifier and the reference dispersion value is established and saved.
A routing switching method, applied to the sending end, the sending end and the receiving end are connected in communication, the sending end and the receiving end are connected to the main control node of ASON respectively, and the connection between the sending end and the receiving end A primary route and a standby route for transmitting services are configured between, and the route switching method includes:

Communicating service data with the receiving end through the backup route, wherein the dispersion compensation parameter applied by the receiving end is obtained by the receiving end performing a dispersion search on the backup route within a dispersion search range, and the dispersion The search range is sent to the receiving end by the master control node when it is determined that the running state of the master route has changed to a fault state.
The method according to claim 9, wherein the dispersion search range is determined by the master control node according to a reference dispersion value and a preset search condition, and the reference dispersion value is obtained in the following manner:

Obtain the dispersion measurement information sent by the master control node;

sending at least two optical probe signals to the receiving end, so that the master control node determines at least one transmission delay difference according to the transmission delay of at least two of the optical probe signals, thereby determining at least one dispersion coefficient, and determining the reference dispersion value according to the at least one dispersion coefficient, wherein the wavelengths of at least two of the optical probe signals are different from each other, and the transmission delay difference is the transmission time of the two optical probe signals delay difference, the dispersion coefficient is obtained according to the transmission delay difference, the wavelength difference of the two optical probe signals corresponding to the transmission delay difference, and the route length information.
A routing switching method, applied to a receiving end, the receiving end communicates with the sending end, the sending end and the receiving end communicate with the main control node of ASON respectively, and the connection between the sending end and the receiving end A primary route and a standby route for transmitting services are configured between, and the route switching method includes:

Acquiring the dispersion search range sent by the master control node, wherein the dispersion search range is sent by the master control node when it is determined that the operation state of the master route is changed to a fault state;

Within the dispersion search range, perform a dispersion search on the standby route to obtain a dispersion compensation parameter;

Applying the dispersion compensation parameter, communicating service data with the sending end through the standby route.
The method according to claim 11, wherein the dispersion search range is determined by the master control node according to a reference dispersion value and a preset search condition, and the reference dispersion value is obtained in the following manner:

Acquiring at least two optical probe signals sent by the sending end, so that the master control node determines at least one transmission delay difference according to the transmission delay of at least two of the optical probe signals, thereby determining at least one dispersion coefficient , and determine the reference dispersion value according to the at least one dispersion coefficient, wherein the wavelengths of at least two of the optical probe signals are different from each other, and the transmission time delay difference is the transmission of the two optical probe signals The delay difference, the dispersion coefficient is obtained according to the transmission delay difference, the wavelength difference of the two optical probe signals corresponding to the transmission delay difference and the route length information, the optical probe The needle signal is sent by the sending end after obtaining the dispersion measurement information sent by the master control node.
A master control node, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein, when the processor executes the computer program, any one of claims 1 to 8 is implemented. The route switching method described in the item.
A routing device, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein, when the processor executes the computer program, any one of claims 9 to 10 is realized The routing switching method; or, when the processor executes the computer program, the routing switching method according to claims 11 to 12 is realized.
A computer-readable storage medium storing computer-executable instructions for executing the route switching method according to any one of claims 1-12.