CN112040352B - Path switching method, device, equipment and readable storage medium - Google Patents
Path switching method, device, equipment and readable storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0037—Operation
- H04Q2011/0043—Fault tolerance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0073—Provisions for forwarding or routing, e.g. lookup tables
Abstract
The invention provides a path switching method, a path switching device, path switching equipment and a readable storage medium. The method comprises the following steps: when a transmission path between two nodes has a fault, determining the maximum transmission rate supported by the two nodes, and determining a target transmission path group with the transmission rate being the maximum transmission rate; if the target transmission path group has available transmission paths, determining an optimal transmission path in the available transmission paths for the two nodes to perform path switching; and if the available transmission path does not exist, determining the next-stage transmission rate supported by both the nodes, and taking the next-stage transmission rate as the maximum transmission rate to execute the step of determining the target transmission path group with the transmission rate as the maximum transmission rate. By the invention, the available resources on the network can be more effectively and flexibly utilized in a speed reduction path searching mode, and the normal operation of high-speed service is ensured to the maximum extent.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a readable storage medium for path switching.
Background
An automatic switched optical network is an optical transport network that performs automatic switching and connection control through a control plane. As an operating network providing various services to users, it must have high reliability for the high-capacity service of B100G, i.e. the network should have strong self-healing capability, and in case of a failure point, the network should have the capability of quickly adopting another route or other protection method to make the service operated thereon unaffected or less affected.
At present, when a transmission path between sites in a network fails, service restoration is generally performed in a 1:1 protection or dynamic rerouting manner, and normal operation of the service is seriously affected when the service cannot be restored in the 1:1 protection or dynamic rerouting manner. Therefore, it is necessary to recover the damaged service as much as possible through a new protection mechanism, so as to improve the self-healing recovery capability of the automatic switched optical network.
Disclosure of Invention
The invention mainly aims to provide a path switching method, a path switching device, path switching equipment and a readable storage medium, and aims to solve the technical problem that the self-healing recovery capability of an automatic switching optical network in the prior art is not strong enough.
In a first aspect, the present invention provides a path switching method, where the path switching method includes:
when a transmission path between two nodes has a fault, determining the maximum transmission rate supported by the two nodes, and determining a target transmission path with the transmission rate of the maximum transmission rate from a normal transmission path between the two nodes to obtain a target transmission path group;
detecting whether an available transmission path exists in the target transmission path group;
if an available transmission path exists, determining an optimal transmission path in the available transmission path, so that two nodes can switch to the optimal transmission path and perform data transmission at the maximum transmission rate;
and if no available transmission path exists, determining a next-stage transmission rate supported by both nodes, and executing a step of determining a target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain a target transmission path group.
Optionally, the step of detecting whether there is an available transmission path in the target transmission path group includes:
calculating to obtain the OSNR value of each sub-transmission path in the target transmission path group;
detecting whether a target sub-transmission path exists in the target transmission path group, wherein an OSNR value of the target sub-transmission path is greater than or equal to a reference OSNR value corresponding to the maximum transmission rate;
if the target sub-transmission path exists, taking the target sub-transmission path as an available transmission path;
and if the target sub-transmission path does not exist, determining that no available transmission path exists in the target transmission path group.
Optionally, the step of determining an optimal transmission path from among the available transmission paths includes:
and when the number of the available transmission paths is more than 1, taking the transmission path with the maximum OSNR value or the minimum node number or the shortest optical fiber length in the available transmission paths as the optimal transmission path.
Optionally, the step of determining an optimal transmission path from among the available transmission paths further includes:
when the number of the available transmission paths is larger than 1, calculating to obtain a performance quantized value of each available transmission path, wherein the performance quantized value is used for representing the goodness and badness of the transmission performance;
and selecting the transmission path with the optimal transmission performance as the optimal transmission path based on the performance quantization value of each available transmission path.
Optionally, the step of calculating a performance quantization value of each available transmission path includes:
acquiring the length value of the optical fiber and the number value of nodes of each available transmission path;
obtaining a performance quantization value of each available transmission path based on a quantization formula, wherein the performance quantization formula is as follows:
S＝α·M+β·N+γ·Q
wherein S is a performance quantization value, alpha is a first weight value, beta is a second weight value, gamma is a third weight value, M is an optical fiber length value, N is a node number value, Q is an OSNR value, and alpha is more than beta and less than gamma.
In a second aspect, the present invention further provides a path switching apparatus, including:
a rate determining module, configured to determine, when a transmission path between two nodes has a fault, a maximum transmission rate supported by both the two nodes, and determine, from a normal transmission path between the two nodes, a target transmission path whose transmission rate is the maximum transmission rate, to obtain a target transmission path group;
a detection module, configured to detect whether an available transmission path exists in the target transmission path group;
a path determining module, configured to determine an optimal transmission path in the available transmission paths if the available transmission path exists, so that two nodes switch to the optimal transmission path and perform data transmission at the maximum transmission rate;
and the circulating module is used for determining the next-stage transmission rate supported by both the nodes if no available transmission path exists, and executing the step of determining the target transmission path with the transmission rate as the maximum transmission rate in the normal transmission path between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain the target transmission path group.
In a third aspect, the present invention also provides a path switching apparatus, which includes a processor, a memory, and a path switching program stored on the memory and executable by the processor, wherein when the path switching program is executed by the processor, the steps of the path switching method as described above are implemented.
In a fourth aspect, the present invention further provides a readable storage medium, on which a path switching program is stored, where the path switching program, when executed by a processor, implements the steps of the path switching method as described above.
In the invention, when a transmission path between two nodes has a fault, the maximum transmission rate supported by the two nodes is determined, and a target transmission path with the transmission rate of the maximum transmission rate is determined from a normal transmission path between the two nodes to obtain a target transmission path group; detecting whether an available transmission path exists in the target transmission path group; if an available transmission path exists, determining an optimal transmission path in the available transmission path, so that two nodes can switch to the optimal transmission path and perform data transmission at the maximum transmission rate; and if no available transmission path exists, determining a next-stage transmission rate supported by both nodes, and executing a step of determining a target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain a target transmission path group. According to the invention, when the transmission path between two stations has a fault, the available resources on the network can be more effectively and flexibly utilized by a way of reducing the speed and searching the path, the normal operation of high-speed service is ensured to the maximum extent, the protection mechanism for recovering the damaged service is enriched, and the self-healing recovery capability of the automatic switching optical network is improved.
Drawings
Fig. 1 is a schematic hardware structure diagram of a path switching device according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a path switching method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a B100G network in an actual engineering network;
fig. 4 is a functional block diagram of a path switching apparatus according to an embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, an embodiment of the present invention provides a path switching device.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a path switching device according to an embodiment of the present invention. In this embodiment of the present invention, the path switching device may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, a memory 1005, which is one type of computer storage medium in fig. 1, may include therein an operating system, a network communication module, a user interface module, and a path switching program. The processor 1001 may call a path switching program stored in the memory 1005, and execute the path switching method provided by the embodiment of the present invention.
In a second aspect, an embodiment of the present invention provides a path switching method.
Referring to fig. 2, fig. 2 is a flowchart illustrating a path switching method according to an embodiment of the present invention. In one embodiment, a path switching method includes:
step S10, when the transmission path between two nodes has a fault, determining the maximum transmission rate supported by both nodes, and determining the target transmission path with the transmission rate being the maximum transmission rate from the normal transmission path between two nodes to obtain a target transmission path group;
in this embodiment, the node refers to a node in the B100G network, and the B100G network refers to a network with a transmission rate greater than or equal to 100G. Referring to fig. 3, fig. 3 is a schematic view of a B100G network in an actual engineering networking. As shown in fig. 3:
the OTU is a service board card of the B100G network; the optical/electrical conversion is carried out on the multiplexing optical path signal conforming to the G.957 standard, then the shaping, timing extraction and data regeneration are carried out on the converted electrical signal, and finally the electrical/optical conversion is carried out, and the DWDM multiplexing optical path signal with the wavelength conforming to the G.692 standard requirement is output.
The WSS receives and transmits an optical wavelength selection switch disc; typically deployed in optical multiplex stations as well as ROADM stations. When the optical wavelength division multiplexing device is applied to a multiplexing station, the bandwidth requirements of signals with different rates such as 10G, 40G, 100G, 400G and the like are met by flexibly adjusting the channel bandwidth, the optical wavelength multiplexing is realized, the attenuation setting meeting the precision requirement can be provided at any bandwidth level, and a wide and flat filtering passband is provided at any attenuation level. When the device is configured on a ROADM site, the device is mainly used for providing flexible up-down wave setting and line channel power leveling adjustment.
OA, optical power amplification disc; the main functions are to amplify the power of the line optical signal, compensate the attenuation of the device or the line, prolong the transmission distance of the optical signal or improve the sensitivity of the receiver.
In the scenario shown in fig. 3, a, B, C, and D are 4 nodes in a network, and each node has many machine room sites, and OTU signals flexibly adjust channel bandwidth through a local WSS, so as to meet bandwidth requirements of signals with different rates, such as 10G, 40G, 100G, and 400G, and implement optical wavelength multiplexing; and then the signal is compensated by an OA amplifying disc, is transmitted to an RODAM station WSS for flexible up-and-down wave setting and line channel power leveling, and finally is transmitted to the next node for a long distance on the node, for example, from the node A to the node B.
In this embodiment, when a transmission path between two nodes has a fault, the maximum transmission rate supported by both nodes is determined. For example, when the node a and the node B perform information transmission through the transmission path 1, and when the transmission path 1 fails, if the transmission rate supported by the node a includes: 600G, 500G, 400G, 300G, 200G, 100G, the transmission rates supported by the node B include: 600G, 500G, 400G, 300G, 200G, 100G, then 600G is used as the maximum transmission rate supported by both nodes. And determining a target transmission path with the maximum transmission rate from the normal transmission paths between the two nodes. For example, if the node a and the node B include the transmission path 1 to the transmission path 20, a target transmission path with a transmission rate of 600G is searched for from the transmission path 2 to the transmission path 20, and a target transmission path group is obtained.
Step S20, detecting whether there is an available transmission path in the target transmission path group;
in this embodiment, based on the above embodiment, if the target transmission path group includes the transmission path 2 to the transmission path 10, it is detected whether there is an available transmission path in the transmission path 2 to the transmission path 10. Specifically, the transmission path from the transmission path 2 to the transmission path 10, in which the OSNR value is greater than the reference OSNR value corresponding to 600G, is used as the available transmission path.
Further, in an embodiment, the step of detecting whether there is an available transmission path in the target transmission path group includes:
calculating to obtain the OSNR value of each sub-transmission path in the target transmission path group; detecting whether a target sub-transmission path exists in the target transmission path group, wherein an OSNR value of the target sub-transmission path is greater than or equal to a reference OSNR value corresponding to the maximum transmission rate; if the target sub-transmission path exists, taking the target sub-transmission path as an available transmission path; and if the target sub-transmission path does not exist, determining that no available transmission path exists in the target transmission path group.
In this embodiment, the OSNR (OSNR-Optical signal noise Ratio) refers to an Optical signal-to-noise Ratio, and different transmission rates have different OSNR requirements for transmission paths, that is, each transmission rate corresponds to a reference OSNR value. Similarly, the calculation of the OSNR value of each transmission path is the prior art, and is not described herein. As described in the above embodiment, the OSNR values of the transmission paths 2 to 10 are calculated respectively when the target transmission path group includes the transmission paths 2 to 10, and if the OSNR values of the transmission paths 2 to 5 are greater than or equal to the reference OSNR value corresponding to 600G, the transmission paths 2 to 5 are used as the available transmission paths. If the OSNR value corresponding to each of the transmission paths 2 to 10 is less than the reference OSNR value corresponding to 600G, it is determined that there is no available transmission path in the target transmission path group.
Step S30, if there is an available transmission path, determining an optimal transmission path in the available transmission path for two nodes to switch to the optimal transmission path and transmitting data at the maximum transmission rate;
in this embodiment, if there are available transmission paths, for example, the available transmission paths include the transmission path 2 to the transmission path 5, an optimal transmission path is selected from the transmission path 2 to the transmission path 5, so that the two nodes switch to the optimal transmission path and perform data transmission at the maximum transmission rate. When selecting the optimal transmission path, the selection may be performed based on indexes such as an OSNR value, a number of nodes, and an optical fiber length corresponding to the transmission path. It is easy to understand that if there is only one available transmission path, the only available transmission path is directly used as the optimal transmission path.
In an optional embodiment, the step of determining an optimal transmission path among the available transmission paths comprises:
and when the number of the available transmission paths is more than 1, taking the transmission path with the maximum OSNR value or the minimum node number or the shortest optical fiber length in the available transmission paths as the optimal transmission path.
In this embodiment, when the available transmission paths include the transmission path 2 to the transmission path 5, the transmission path with the largest OSNR value among the transmission path 2 to the transmission path 5 is used as the optimal transmission path; or, the transmission path with the least number of nodes from the transmission path 2 to the transmission path 5 is used as the optimal transmission path; or, the transmission path with the shortest optical fiber length from the transmission path 2 to the transmission path 5 is used as the optimal transmission path.
In another optional embodiment, the step of determining an optimal transmission path among the available transmission paths further includes:
when the number of the available transmission paths is larger than 1, calculating to obtain a performance quantized value of each available transmission path, wherein the performance quantized value is used for representing the goodness and badness of the transmission performance;
and selecting the transmission path with the optimal transmission performance as the optimal transmission path based on the performance quantization value of each available transmission path.
In this embodiment, the transmission performance of each available transmission path is quantized to obtain a performance quantization value of each available transmission path, so that a transmission path with the optimal transmission performance can be selected according to the performance quantization value.
Specifically, in an embodiment, the step of calculating the performance quantization value of each available transmission path includes:
acquiring the length value of the optical fiber and the number value of nodes of each available transmission path;
in this embodiment, the optical fiber length value and the node number value of each transmission path may be stored in the memory in advance as basic information of each transmission path. When the performance quantization value of each available transmission path needs to be calculated, the optical fiber length value and the node number value of each available transmission path can be obtained based on the information stored in the memory.
Obtaining a performance quantization value of each available transmission path based on a quantization formula, wherein the performance quantization formula is as follows:
S＝α·M+β·N+γ·Q
wherein S is a performance quantization value, alpha is a first weight value, beta is a second weight value, gamma is a third weight value, M is an optical fiber length value, N is a node number value, Q is an OSNR value, and alpha is more than beta and less than gamma.
In this embodiment, the optical fiber length value, the node number value, and the OSNR value of each available transmission path are substituted into the above formula, so as to obtain a performance quantization value of each available transmission path. And specific values of the first weight value, the second weight value and the third weight value are set according to actual needs.
In this embodiment, the optimal transmission path is determined by comprehensively considering the three dimensions of the optical fiber length value, the node number value and the OSNR value, so that the determined optimal transmission path better meets the actual needs.
Step S40, if there is no available transmission path, determining a next-stage transmission rate supported by both nodes, and taking the next-stage transmission rate as the maximum transmission rate, executing the step of determining a target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes, and obtaining a target transmission path group.
In this embodiment, it is assumed that the two nodes both support transmission rates, which are sequentially from large to small: 600G, 500G, 400G, 300G, 200G and 100G. When the first selected transmission rate is the maximum transmission rate 600G, if there is no available transmission path, 500G (i.e., the next stage transmission rate of 600G) is used as the maximum transmission rate, and a step of determining a target transmission path with the transmission rate being the maximum transmission rate from normal transmission paths between two nodes is performed to obtain a target transmission path group, that is, according to the scheme described in the above embodiment, a target transmission path group with the transmission rate of 500G is determined, whether there is an available transmission path in the target transmission path group is detected, and if there is an available transmission path, an optimal transmission path is selected from the available transmission paths for the two nodes to switch to the optimal transmission path, and data transmission is performed at the maximum transmission rate. If not, taking 400G (namely the next stage transmission rate of 500G) as the maximum transmission rate, and executing the step of determining the target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes to obtain the target transmission path group. And repeating the steps until an optimal transmission path is found or the next transmission rate does not exist, and ending the process.
In this embodiment, when a transmission path between two nodes has a fault, determining a maximum transmission rate supported by both the two nodes, and determining a target transmission path with a transmission rate of the maximum transmission rate from a normal transmission path between the two nodes to obtain a target transmission path group; detecting whether an available transmission path exists in the target transmission path group; if an available transmission path exists, determining an optimal transmission path in the available transmission path, so that two nodes can switch to the optimal transmission path and perform data transmission at the maximum transmission rate; and if no available transmission path exists, determining a next-stage transmission rate supported by both nodes, and executing a step of determining a target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain a target transmission path group. Through the embodiment, when a transmission path between two stations has a fault, the available resources on the network can be more effectively and flexibly applied by a way of reducing the speed and searching the path, the normal operation of high-speed service is ensured to the maximum extent, a protection mechanism for recovering the damaged service is enriched, and the self-healing recovery capability of the automatic switched optical network is improved.
In a third aspect, an embodiment of the present invention further provides a path switching apparatus.
Referring to fig. 4, fig. 4 is a functional module diagram of an embodiment of a path switching apparatus.
In one embodiment, the path switching apparatus includes:
a rate determining module 10, configured to determine, when a transmission path between two nodes has a fault, a maximum transmission rate supported by both the two nodes, and determine, from a normal transmission path between the two nodes, a target transmission path whose transmission rate is the maximum transmission rate, to obtain a target transmission path group;
a detecting module 20, configured to detect whether there is an available transmission path in the target transmission path group;
a path determining module 30, configured to determine, if there is an available transmission path, an optimal transmission path among the available transmission paths, so that two nodes switch to the optimal transmission path and perform data transmission at the maximum transmission rate;
and a loop module 40, configured to determine a next-stage transmission rate supported by both nodes if there is no available transmission path, and execute a step of determining, from the normal transmission paths between the two nodes, a target transmission path with the transmission rate of the maximum transmission rate, using the next-stage transmission rate as the maximum transmission rate, to obtain a target transmission path group.
Further, in an embodiment, the detecting module 20 is configured to:
calculating to obtain the OSNR value of each sub-transmission path in the target transmission path group;
detecting whether a target sub-transmission path exists in the target transmission path group, wherein an OSNR value of the target sub-transmission path is greater than or equal to a reference OSNR value corresponding to the maximum transmission rate;
if the target sub-transmission path exists, taking the target sub-transmission path as an available transmission path;
and if the target sub-transmission path does not exist, determining that no available transmission path exists in the target transmission path group.
Further, in an embodiment, the path determining module 30 is configured to:
and when the number of the available transmission paths is more than 1, taking the transmission path with the maximum OSNR value or the minimum node number or the shortest optical fiber length in the available transmission paths as the optimal transmission path.
Further, in an embodiment, the path determining module 30 is further configured to:
when the number of the available transmission paths is larger than 1, calculating to obtain a performance quantized value of each available transmission path, wherein the performance quantized value is used for representing the goodness and badness of the transmission performance;
and selecting the transmission path with the optimal transmission performance as the optimal transmission path based on the performance quantization value of each available transmission path.
Further, in an embodiment, the path determining module 30 is further configured to:
acquiring the length value of the optical fiber and the number value of nodes of each available transmission path;
obtaining a performance quantization value of each available transmission path based on a quantization formula, wherein the performance quantization formula is as follows:
S＝α·M+β·N+γ·Q
wherein S is a performance quantization value, alpha is a first weight value, beta is a second weight value, gamma is a third weight value, M is an optical fiber length value, N is a node number value, Q is an OSNR value, and alpha is more than beta and less than gamma.
The function implementation of each module in the path switching device corresponds to each step in the embodiment of the path switching method, and the function and implementation process are not described in detail here.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The readable storage medium of the present invention stores a path switching program, wherein the path switching program, when executed by a processor, implements the steps of the path switching method as described above.
The method for implementing the path switching program when executed may refer to various embodiments of the path switching method of the present invention, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A path switching method, characterized in that the path switching method comprises:
when a transmission path between two nodes has a fault, determining the maximum transmission rate supported by the two nodes, and determining a target transmission path with the transmission rate of the maximum transmission rate from a normal transmission path between the two nodes to obtain a target transmission path group;
detecting whether an available transmission path exists in the target transmission path group;
if an available transmission path exists, determining an optimal transmission path in the available transmission path, so that two nodes can switch to the optimal transmission path and perform data transmission at the maximum transmission rate;
and if no available transmission path exists, determining a next-stage transmission rate supported by both nodes, and executing a step of determining a target transmission path with the transmission rate as the maximum transmission rate from the normal transmission paths between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain a target transmission path group.
2. The path switching method according to claim 1, wherein the step of detecting whether there is an available transmission path in the target transmission path group comprises:
calculating to obtain the OSNR value of each sub-transmission path in the target transmission path group;
detecting whether a target sub-transmission path exists in the target transmission path group, wherein an OSNR value of the target sub-transmission path is greater than or equal to a reference OSNR value corresponding to the maximum transmission rate;
if the target sub-transmission path exists, taking the target sub-transmission path as an available transmission path;
and if the target sub-transmission path does not exist, determining that no available transmission path exists in the target transmission path group.
3. The path switching method according to claim 2, wherein the step of determining an optimal transmission path among the available transmission paths comprises:
and when the number of the available transmission paths is more than 1, taking the transmission path with the maximum OSNR value or the minimum node number or the shortest optical fiber length in the available transmission paths as the optimal transmission path.
4. The path switching method according to claim 2, wherein the step of determining an optimal transmission path among the available transmission paths further comprises:
when the number of the available transmission paths is larger than 1, calculating to obtain a performance quantized value of each available transmission path, wherein the performance quantized value is used for representing the goodness and badness of the transmission performance;
and selecting the transmission path with the optimal transmission performance as the optimal transmission path based on the performance quantization value of each available transmission path.
5. The path switching method according to claim 4, wherein the step of calculating the performance quantization value of each available transmission path comprises:
acquiring the length value of the optical fiber and the number value of nodes of each available transmission path;
obtaining a performance quantization value of each available transmission path based on a quantization formula, wherein the performance quantization formula is as follows:
S＝α·M+β·N+γ·Q
wherein S is a performance quantization value, alpha is a first weight value, beta is a second weight value, gamma is a third weight value, M is an optical fiber length value, N is a node number value, Q is an OSNR value, and alpha is more than beta and less than gamma.
6. A path switching apparatus, characterized in that the path switching apparatus comprises:
a rate determining module, configured to determine, when a transmission path between two nodes has a fault, a maximum transmission rate supported by both the two nodes, and determine, from a normal transmission path between the two nodes, a target transmission path whose transmission rate is the maximum transmission rate, to obtain a target transmission path group;
a detection module, configured to detect whether an available transmission path exists in the target transmission path group;
a path determining module, configured to determine an optimal transmission path in the available transmission paths if the available transmission path exists, so that two nodes switch to the optimal transmission path and perform data transmission at the maximum transmission rate;
and the circulating module is used for determining the next-stage transmission rate supported by both the nodes if no available transmission path exists, and executing the step of determining the target transmission path with the transmission rate as the maximum transmission rate in the normal transmission path between the two nodes by taking the next-stage transmission rate as the maximum transmission rate to obtain the target transmission path group.
7. The path switching apparatus according to claim 6, wherein the detecting module is configured to:
calculating to obtain the OSNR value of each sub-transmission path in the target transmission path group;
detecting whether a target sub-transmission path exists in the target transmission path group, wherein an OSNR value of the target sub-transmission path is greater than or equal to a reference OSNR value corresponding to the maximum transmission rate;
if the target sub-transmission path exists, taking the target sub-transmission path as an available transmission path;
and if the target sub-transmission path does not exist, determining that no available transmission path exists in the target transmission path group.
8. The path switching apparatus according to claim 6, wherein the path determining module is configured to:
and when the number of the available transmission paths is more than 1, taking the transmission path with the maximum OSNR value or the minimum node number or the shortest optical fiber length in the available transmission paths as the optimal transmission path.
9. A path switching apparatus, characterized in that the path switching apparatus comprises a processor, a memory, and a path switching program stored on the memory and executable by the processor, wherein the path switching program, when executed by the processor, implements the steps of the path switching method according to any one of claims 1 to 5.
10. A readable storage medium having a path switching program stored thereon, wherein the path switching program, when executed by a processor, implements the steps of the path switching method according to any one of claims 1 to 5.
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