WO2022105499A1 - 一种路径选择方法以及路径选择装置 - Google Patents

一种路径选择方法以及路径选择装置 Download PDF

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WO2022105499A1
WO2022105499A1 PCT/CN2021/123958 CN2021123958W WO2022105499A1 WO 2022105499 A1 WO2022105499 A1 WO 2022105499A1 CN 2021123958 W CN2021123958 W CN 2021123958W WO 2022105499 A1 WO2022105499 A1 WO 2022105499A1
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Prior art keywords
srlg
path
distance
oms
node
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PCT/CN2021/123958
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English (en)
French (fr)
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马军棋
严可荣
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华为技术有限公司
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • 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
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present application relate to the technical field of optical networks, and in particular, to a path selection method and a path selection apparatus.
  • ASON Automatically switched optical network
  • WDM wavelength division multiplexing
  • the management and control system or the ASON controller performs path selection based on an optical multiplex section (optical multiplex section, OMS) topology. Specifically, the management and control system or the ASON controller selects a transmission path for the service to be transmitted according to the routing policy of the OMS.
  • OMS optical multiplex section
  • the foregoing solution does not involve the actual situation of the optical fiber path carrying the OMS. Therefore, the failure risk of the transmission path determined based on the foregoing solution cannot be estimated, which is not conducive to ensuring the reliability of service transmission.
  • Embodiments of the present application provide a path selection method and a path selection device, which are used to select a target path for transmitting service data based on attribute information of a shared risk link group (SRLG) bearing an OMS. Since the attribute information of the SRLG can reflect the attributes of the actual physical fiber segment/optical cable segment, selecting a target path with a lower failure risk according to the attributes of the SRLG is beneficial to improve the reliability of service transmission.
  • SRLG shared risk link group
  • the present application provides a path selection method.
  • the path selection method can be applied to a scenario where a known source node and a destination node select a working path, and can also be applied to a known source node, a destination node, and a working path to select a working path. Scenes to protect the path.
  • the path selection device will first determine the OMS topology of the optical multiplexing section between the source node and the destination node, where the OMS topology includes multiple OMSs. Then, the path selection device obtains the attribute information of the shared risk link group SRLG corresponding to each OMS.
  • the path selection device selects a target path according to the attribute information of the SRLG, wherein the target path is used to transmit service data from the source node to the destination node through at least one OMS of the plurality of OMSs.
  • the target path is used to transmit service data from the source node to the destination node; when the target path is the protection path (or backup path) of a certain working path, the target path is used for When the working path fails, the aforementioned service data is transmitted from the source node to the destination node instead of the working path.
  • the foregoing solution may be executed by a management and control system that manages the ASON network, and may also be executed by a certain node (for example, the foregoing source node) in the ASON network.
  • the step of determining the OMS topology of the optical multiplexing section between the source node and the destination node can be understood as the management and control system selects the source node to the destination node from the entire OMS topology stored in the management and control system. OMS topology between.
  • the step of determining the OMS topology between the source node and the destination node can be understood as that the node obtains the OMS topology between the source node and the destination node from the management and control system.
  • the aforementioned OMS topology of the optical multiplexing section between the source node and the destination node includes a plurality of OMSs that have a direct or indirect connection relationship with the source node, and also include OMSs that have a direct and indirect connection relationship with the destination node, and , there are multiple OMSs in the OMS topology that can be connected to each other to form a path from the source node to the destination node.
  • the SRLG corresponding to the aforementioned OMS refers to the SRLG to which the optical fiber carrying the OMS belongs. It can also be understood that the OMS is a logical link, and the SRLG is a physical link carrying the aforementioned logical link. Generally, one OMS corresponds to one or more SRLGs, that is, one OMS may be borne by one SRLG, or may be borne by multiple SRLGs.
  • the attribute information of the SRLG corresponding to the OMS is considered when selecting the target path for transmitting service data, that is, the actual situation of the optical fiber path carrying the OMS is considered.
  • the attribute information of the SRLG can reflect the failure risk situation of the actual optical fiber path. Therefore, screening the target path based on the attribute information of the SRLG is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • the solution that only considers the number of OMSs between the source node and the destination node and the solution that only considers the number of SRLGs between the source node and the destination node the solution of this application will refer to the solution of each SRLG.
  • Attribute information since the value of an attribute of different SRLGs is different, determining the target path based on the attribute information of the SRLG can truly and objectively reflect the situation of the SRLG (that is, the situation of the physical link), and thus can more accurately Avoid the risk of failure. Therefore, compared with the solution of the traditional technology, it is beneficial to reduce the failure risk of the transmission path.
  • the attribute information includes the SRLG distance.
  • the attribute information of the SRLG is the SRLG distance of the SRLG.
  • the SRLG distance refers to the length of the optical fiber segment/optical cable segment in a shared risk link group, and the optical fiber segment/optical cable segment in the same SRLG has the same or a similar risk of failure.
  • An SRLG may contain an optical fiber segment/optical cable segment, and in this case, the SRLG distance is the length of the optical fiber segment/optical cable segment located in the SRLG.
  • One SRLG may also contain two or more optical fiber segments/cable segments, in this case, the SRLG distance is the length of two or more side-by-side optical fiber segments/cable segments located in the SRLG.
  • the SRLG distance needs to be considered when determining the target path, not just the number of SRLGs or the number of OMSs. Since most of the optical fiber sections/cable sections are laid in the form of SRLGs, if the number of SRLGs and the SRLG distance of each SRLG are known, the actual physical optical fiber link can be inferred. Therefore, it is beneficial for the path selection device to filter out target paths with lower failure risks.
  • each of the OMSs corresponds to one or more SRLGs.
  • the aforementioned path selection device selects the target path according to the attribute information of the SRLG, including: calculating the SRLG cumulative distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs, and the SRLG cumulative distance is the SRLG corresponding to all the OMSs on the candidate path.
  • the cumulative sum of the SRLG distances; when the cumulative SRLG distance is less than the first preset value, and the candidate path includes the destination node, the candidate path corresponding to the cumulative SRLG distance is determined as the target path.
  • the SRLG cumulative distance of at least one candidate path is calculated, that is, the SRLG distances of all SRLGs on a certain path are summed.
  • the SRLG cumulative distance can reflect the actual fiber path length. The shorter the aforementioned SRLG cumulative distance is, the shorter the actual fiber path length in this path can be inferred. In general, the shorter the actual fiber path, the lower the risk of failure. Therefore, the candidate path corresponding to the smaller SRLG cumulative distance can be selected as the target path to ensure that the failure risk of the target path is reduced.
  • the aforementioned candidate paths include not only the path from the source node to the destination node, but also the path from the source node to some intermediate node. That is to say, in the process of determining the target path, the path selection device will continuously search for the OMS and the intermediate node from the source node to the destination node. In this process, if the cumulative SRLG distance of a certain path from the source node to the intermediate node is greater than the first preset value, the path selection device may no longer search for the destination node based on the intermediate node of the candidate path.
  • the path selection device does not search for every path from the source node to the destination node, but searches for a path whose cumulative SRLG is less than the first preset value based on the source node, so that the reduction of The calculation amount is reduced, and the calculation load of the routing device is reduced.
  • selecting the target path according to the attribute information of the SRLG includes: the path selection device first obtains the SRLG distances of the SRLGs corresponding to the first OMS connected to the source node and calculates a first cumulative sum , and the SRLG distance of each SRLG corresponding to the second OMS connected to the source node, and calculate the second cumulative sum.
  • the first cumulative sum refers to the cumulative sum of SRLG distances of all SRLGs corresponding to the first OMS.
  • the second cumulative sum refers to the cumulative sum of SRLG distances of all SRLGs corresponding to the second OMS.
  • the path selection device compares the first cumulative sum with the second cumulative sum, and if the first cumulative sum is smaller than the second cumulative sum, it is determined that the node connected to the source node through the first OMS is the first candidate node. Then, the path selection device obtains the SRLG distance of each SRLG corresponding to the third OMS connected to the first candidate node, and calculates a third cumulative sum, and the distance of each SRLG corresponding to the fourth OMS connected to the first candidate node SRLG distance, and calculate the fourth cumulative sum.
  • the path selection device compares the third cumulative sum with the fourth cumulative sum, if the third cumulative sum is smaller than the fourth cumulative sum, and the node connected to the first candidate node through the fourth OMS is The destination node determines that the node connected to the first candidate node through the third OMS is the second candidate node. Then, the path selection device will acquire the SRLG distances of the respective SRLGs corresponding to the fifth OMS connected to the second candidate node, and calculate a fifth cumulative sum.
  • the node connected to the second candidate node through the fifth OMS is the destination node, and the sum of the fifth cumulative sum and the third cumulative sum is less than the fourth cumulative sum, then determine the first OMS, the first The path formed by the three OMSs and the fifth OMS is the target path.
  • the first candidate node and the second candidate node are intermediate nodes between the source node and the destination node. It should be understood that the foregoing embodiment is only a process of determining a target path in an OMS topology with a small number of OMSs. In practical applications, there will be more intermediate nodes between the source node and the destination node, and the path selection device will determine more candidate nodes. However, the specific calculation method is similar to the aforementioned method.
  • the selecting the target path according to the attribute information of the SRLG includes: obtaining the SRLG corresponding to the first OMS between the source node and the first node according to the source node and the first node distance; according to the source node and the second node, obtain the SRLG distance corresponding to the second OMS between the source node and the second node; if the SRLG distance corresponding to the first OMS is less than the SRLG distance corresponding to the second OMS, Then, according to the first node and the third node, obtain the SRLG distance corresponding to the third OMS between the first node and the third node, and obtain the first node and the target node according to the first node and the destination node.
  • the SRLG distance corresponding to the fourth OMS between the destination nodes if the SRLG distance corresponding to the third OMS is smaller than the SRLG distance corresponding to the fourth OMS, then obtain the third node and the destination node according to the third node and the destination node.
  • the first node, the second node, and the third node are intermediate nodes between the source node and the destination node. It should be understood that the foregoing embodiment is only a process of determining a target path in an OMS topology with a small number of OMSs. In practical applications, there will be more intermediate nodes between the source node and the destination node, and the path selection device will determine more candidate nodes. However, the specific calculation method is similar to the aforementioned method.
  • each of the OMSs corresponds to one or more SRLGs.
  • the selecting a target path according to the attribute information of the SRLG includes: calculating the SRLG coincidence distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs, each of the candidate paths includes at least one OMS, and the SRLG coincidence distance is a candidate path and The cumulative sum of the SRLG distances of the same SRLG between a working path, and the working path is used to transmit service data from the source node to the destination node through at least one of the OMS; if the SRLG overlap distance is less than the second preset value, and, If the candidate path includes the destination node, the candidate path corresponding to the SRLG coincidence distance is determined as the target path.
  • the path selection device may determine the protection path of the working path based on the SRLG distance. Since the protection path is used to transmit service data instead of the working path when the working path fails, the working path should not affect the protection path as much as possible when the working path fails. That is, the working path and the protection path should be separated as much as possible or not interfere with each other. From the point of view of SRLG, the same SRLG should be avoided as much as possible between each SRLG constituting the working path and each SRLG constituting the protection path. Even if there is no complete SRLG separation between the working path and the protection path, the distance of the SRLG shared by the working path and the protection path should be as short as possible. Therefore, the target path, that is, the protection path of the working path, can be selected by calculating the SRLG coincidence distance.
  • the O&M personnel generally select the path that is completely separated from the working path by the SRLG as the protection path. If there is no path completely separated from the working path by the SRLG, the protection path is often selected based on the preset OMS routing policy. For example, the path containing the least number of OMSs between the source node and the destination node is selected as the path for transmitting service data. For example, if the candidate path A from the source node to the destination node needs to pass through 3 OMSs, and the candidate path B from the source node to the destination node only needs to pass through 2 OMSs, then, according to the traditional technical solution, the candidate path B will be selected as the The final path for transmitting service data.
  • the preset OMS routing policy only refers to the number of OMSs and does not consider attributes such as the SRLG distance of the SRLG, it is not conducive to screening out target paths with lower risks.
  • the solution in this embodiment can screen out the path with the smallest SRLG overlap distance as the target path when a path with complete SRLG separation cannot be found, which can reduce the risk of failure of the target path to a certain extent, thereby improving service data transmission. reliability.
  • the working path in this embodiment may be determined in the manner before this embodiment, or may be manually selected by operation and maintenance personnel, which is not specifically limited here.
  • the method further includes: calculating the SRLG cumulative distance of the candidate path according to the SRLG distance, where the SRLG cumulative distance is the cumulative sum of the SRLG distances of the SRLGs corresponding to all OMSs on the candidate path; if The SRLG coincidence distance is less than the second preset value, and the SRLG accumulated distance is less than the third preset value, and the candidate path includes the destination node, then the candidate path corresponding to the SRLG accumulated distance is determined as the target path.
  • the SRLG coincidence distance and the SRLG accumulated distance are considered at the same time, and among several candidate paths with the same length of SRLG accumulated distance, the candidate path with the smaller SRLG coincidence distance can be selected as the target path; Among several candidate paths with the same length of SRLG coincidence distance, the candidate path with the smaller SRLG cumulative distance is selected as the target path. It is beneficial to further reduce the failure risk of the target path, thereby improving the reliability of service data transmission.
  • the attribute information further includes an SRLG type
  • the selecting a target path according to the attribute information of the SRLG includes: determining the risk coefficient of each SRLG type and the risk coefficient of the overlapping distance of the SRLG ; Determine the risk value of at least one candidate path according to the SRLG distance, the SRLG type, the risk coefficient of the SRLG type and the SRLG coincidence risk coefficient, and the SRLG coincidence risk coefficient is used to indicate the degree of risk when the candidate path coincides with the working path; If the risk value is smaller than the fourth preset value, and the candidate path includes the destination node, the candidate path corresponding to the risk value is determined as the target path.
  • the attribute information of the SRLG not only includes the aforementioned SRLG distance, but also includes the SRLG type, and different SRLG types will introduce different degrees of failure risk. That is to say, if the SRLG distances of two SRLGs are the same, but the SRLG types of the two SRLGs are different, then when the two different SRLGs are used to form the target path, the introduced failure risks are different.
  • the SRLG type includes overhead co-cable, pipeline co-cable, and pipeline co-ditch. Generally, the failure risk of overhead co-cable is greater than that of pipeline co-cable, and the failure risk of pipeline co-cable is greater than that of pipeline co-ditch.
  • this embodiment introduces a risk value, which is a quantified symbol for the SRLG distance and the SRLG type.
  • a risk value is a quantified symbol for the SRLG distance and the SRLG type.
  • the present application provides a path selection device.
  • the path selection device may be a management and control system for managing an ASON network or a functional module in the management and control system; the path selection device may also be a function located in a certain computing node. module.
  • the path selection device includes a determination module, an acquisition module, and a selection module.
  • the determining module is used to determine the OMS topology of the optical multiplexing section between the source node and the destination node, and the OMS topology includes multiple OMSs;
  • the acquiring module is used to acquire the attributes of the shared risk link group SRLG corresponding to each of the OMSs information;
  • a selection module configured to select a target path according to the attribute information of the SRLG, where the target path is used to transmit service data from the source node to the destination node through at least one OMS of the plurality of OMSs.
  • the attribute information of the SRLG corresponding to the OMS is considered, that is, the actual situation of the optical fiber path carrying the OMS is considered.
  • the attribute information of the SRLG can reflect the failure risk situation of the actual optical fiber path. Therefore, screening the target path based on the attribute information of the SRLG is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • the solution that only considers the number of OMSs between the source node and the destination node and the solution that only considers the number of SRLGs between the source node and the destination node the solution of this application will refer to the solution of each SRLG.
  • Attribute information since the value of an attribute of different SRLGs is different, determining the target path based on the attribute information of the SRLG can truly and objectively reflect the situation of the SRLG (that is, the situation of the physical link), and thus can more accurately Avoid the risk of failure. Therefore, compared with the solution of the traditional technology, it is beneficial to reduce the failure risk of the transmission path.
  • the attribute information includes the SRLG distance.
  • each of the OMSs corresponds to one or more SRLGs.
  • the selection module is specifically used for: calculating the SRLG cumulative distance of at least one candidate path according to the SRLG distances corresponding to multiple OMSs, and the SRLG cumulative distance is the cumulative sum of the SRLG distances of the SRLGs corresponding to all OMSs on the candidate path; when the SRLG If the accumulated distance is less than the first preset value, and the candidate path includes the destination node, the candidate path corresponding to the accumulated distance of the SRLG is determined as the target path.
  • each of the OMSs corresponds to one or more SRLGs.
  • the selection module is specifically configured to: calculate the SRLG coincidence distance of at least one candidate path according to the SRLG distances corresponding to multiple OMSs, each of the candidate paths includes at least one OMS, and the SRLG coincidence distance is between a candidate path and a working path The cumulative sum of the SRLG distances of the same SRLG, the working path is used to transmit service data from the source node to the destination node through at least one of the OMS; if the SRLG coincidence distance is less than the second preset value, and the candidate path includes the target node, then determine the candidate path corresponding to the SRLG coincidence distance as the target path.
  • the selection module is further configured to: calculate the SRLG cumulative distance of the candidate path according to the SRLG distance, where the SRLG cumulative distance is the cumulative SRLG distance of the SRLGs corresponding to all OMSs on the candidate path and; if the SRLG coincidence distance is less than the second preset value, and the SRLG cumulative distance is less than the third preset value, and, the candidate path includes the destination node, then determine that the SRLG cumulative distance corresponding candidate path is the Target path.
  • the attribute information further includes the SRLG type.
  • This selection module is specifically used for:
  • Determine the risk coefficient of each SRLG type and the SRLG coincidence risk coefficient determine the risk value of at least one candidate path according to the SRLG distance, the SRLG type, the risk coefficient of the SRLG type, and the SRLG coincidence risk coefficient, and the SRLG coincidence risk coefficient is determined by Indicates the risk level when the candidate path coincides with the working path; if the risk value is less than the fourth preset value, and the candidate path includes the destination node, the candidate path corresponding to the risk value is determined as the target path.
  • the SRLG type includes overhead co-cable, pipeline co-cable, and pipeline co-ditch.
  • the present application further provides a path selection device, the path selection device includes a processor, the processor is coupled to a memory, the memory stores a program, and when the program instructions stored in the memory are executed by the processor, the processor causes the The path selection apparatus implements the method described in any one of the foregoing embodiments of the first aspect.
  • the present application further provides a computer-readable storage medium, including a computer program, where the computer program is executed by a processor to implement the method described in any one of the embodiments of the foregoing first aspect.
  • the present application also provides a computer program product containing instructions, the computer program product includes computer program code, when the computer program code is run on a computer, the computer is made to execute any one of the implementations of the foregoing first aspect. method described in the method.
  • the embodiments of the present application have the following advantages:
  • the path selection device when there is a service request that needs to transmit service data from the source node to the destination node, the path selection device will first determine the OMS topology of the optical multiplex section between the source node and the destination node. Then, attribute information of the shared risk link group SRLG corresponding to each of the OMSs is acquired, where the attribute information includes the SRLG distance. Then, a target path for transmitting service data is determined according to the SRLG distance. Because, when selecting the target path for transmitting service data, the attribute information of the SRLG corresponding to the OMS is considered, that is, the actual situation of the optical fiber path corresponding to the OMS is considered. The attribute information of the SRLG can reflect the failure risk situation of the actual optical fiber path. Therefore, screening the target path based on the attribute information of the SRLG is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • 1A is a network architecture diagram of a path selection method in an embodiment of the present application.
  • FIG. 1B is another network architecture diagram of the path selection method in the embodiment of the present application.
  • FIG. 2 is a flowchart of a path selection method in an embodiment of the present application.
  • FIG. 3 is an exemplary diagram of an OMS topology in an embodiment of the present application.
  • FIG. 4 is another flowchart of the path selection method in the embodiment of the present application.
  • FIG. 5A is another exemplary diagram of the OMS topology in the embodiment of the present application.
  • 5B is an example diagram of an SRLG topology in an embodiment of the present application.
  • 5C is another exemplary diagram of the SRLG topology in the embodiment of the present application.
  • FIG. 7 is a schematic diagram of an embodiment of a path selection apparatus in an embodiment of the present application.
  • FIG. 8 is a schematic diagram of another embodiment of a path selection apparatus in an embodiment of the present application.
  • Embodiments of the present application provide a path selection method and a path selection device, which are used to select a target path for transmitting service data based on attribute information of a shared risk link group SRLG that bears an OMS. Because the target path with lower failure risk can be selected according to the attributes of the SRLG, it is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • FIG. 1A it is a system architecture diagram of a path selection method proposed by an embodiment of the present application.
  • the system includes a management and control system/ASON controller 101 , an ASON network 102 and an operator management device 103 .
  • the ASON network 102 includes a plurality of nodes and an OMS connected to the aforementioned nodes, and the aforementioned nodes transmit service data through the OMS.
  • node A and node D are connected through OMS6, and node A can transmit service data to node D through the aforementioned OMS6. Since there are multiple OMSs in the aforementioned ASON network, when one OMS is determined, the nodes at both ends of the OMS are also determined. Therefore, in this embodiment of the present application, the connection situation between each OMS and the node in the ASON network is referred to as an OMS topology.
  • the aforementioned node can be understood as a site that needs to use service data, or a site that can transfer service data, which is not specifically limited here.
  • the nodes introduced in this application may also be network elements in a data transmission network and other devices or devices capable of transferring or processing service data, which are not specifically limited here.
  • the management and control system/ASON controller 101 is used to manage each node in the aforementioned ASON network 102 , including sending control signaling to each node in the ASON network 102 and collecting information of each node in the ASON network 102 .
  • the management and control system/ASON controller 101 sends a control instruction to the node A in the ASON network 102 to instruct the node A to transmit service data to the node C, then the node A will transmit the service data from the node A to the node C through the OMS7 node C.
  • the aforementioned management and control system/ASON control 101 can also communicate with the operator management device 103, so that the management and control system/ASON controller 101 can provide the information of each OMS in the ASON network to the operator management device 103, and can also enable the operator to
  • the management device 103 provides the management and control system/ASON controller 101 with information on the optical fibers carrying the aforementioned respective OMSs.
  • FIG. 1A is a diagram of a physical link carrying the OMS topology shown in the foregoing FIG.
  • point F represents an optical switching box.
  • the OMS7 between the node A and the node C is carried by the optical cable section AF and the optical cable section FC; the OMS1 between the node A and the node B is carried by the optical cable section AF and the optical cable section FB.
  • the physical link carrying OMS7 and the physical link carrying OMS1 include a common optical cable segment AF, and these two side-by-side optical cable segments with the same or similar failure risks are called shared risk link groups ( Shared risk link group, SRLG), different fiber segments/cable segments in the same SRLG have the same or similar failure risk.
  • SRLG shared risk link group
  • one OMS corresponds to one or more SRLGs, and it can also be understood that one OMS is carried by one or more SRLGs.
  • the logical link between node A and node C is OMS7
  • the physical fiber link carrying the aforementioned OMS7 includes SRLG1 and SRLG3.
  • SRLG1 and SRLG3 are connected through an optical switching box (ie point F).
  • the logical link between Node A and Node B is OMS1
  • the physical fiber link carrying the aforementioned OMS1 includes SRLG1 and SRLG2.
  • SRLG1 and SRLG3 are connected through an optical switching box (ie point F).
  • the service data from node A to node B can be transmitted through OMS1 or through OMS8.
  • the SRLGs corresponding to different OMSs are not identical, that is, the physical links connecting Node A and Node B are not identical.
  • the physical fiber link carrying the aforementioned OMS1 includes SRLG1 and SRLG2; and the physical fiber link bearing the aforementioned OMS8 is SRLG8.
  • FIG. 1A and FIG. 1B are only examples for the convenience of introducing the solution.
  • the OMS topology will include more OMSs, and the correspondence between OMSs and SRLGs will be more complicated.
  • the management and control system/ASON control 101 can obtain the aforementioned physical link bearing the aforementioned OMS from the aforementioned operator management device 103 information of the link (for example, the attribute information of the SRLG), and then the target path can be selected based on the information of the physical link carrying the OMS (for example, the attribute information of the SRLG).
  • the path selection device when the target path from the source node to the target node needs to be calculated, the path selection device will perform the following steps:
  • Step 201 Determine the OMS topology of the optical multiplexing section between the source node and the destination node.
  • the source node is the starting point of transmitting service data
  • the destination node is the end point of transmitting service data.
  • the aforementioned OMS topology between the source node and the destination node refers to including multiple OMSs that have direct or indirect connections with the source node, and also includes OMSs that have direct and indirect connections with the destination node, and there are multiple OMSs in the OMS topology.
  • the OMSs can be connected to each other to form a path from a source node to a destination node.
  • node A is a source node and node D is a destination node
  • node A can be directly communicated with node D through OMS6; this node A can also be indirectly communicated with node D through OMS5, node E and OMS4;
  • the node A can also be indirectly connected to the node D through the OMS7, the node C and the OMS3; the node A can also be indirectly connected to the node D through the OMS1, the node B, the OMS2, the node C and the OMS3. Therefore, the network topology shown in FIG. 1A can be understood as an OMS topology from a source node (ie, node A) to a destination node (ie, node D).
  • the path selection device may be a management and control system that manages the ASON network, or may be a certain node (for example, the aforementioned source node) in the ASON network.
  • the step of determining the OMS topology between the source node and the destination node can be understood as: the management and control system filters out the OMS topology from the source node to the destination node from the entire OMS topology stored in the management and control system. OMS topology.
  • the step of determining the OMS topology between the source node and the destination node can be understood as that the node obtains the OMS topology between the source node and the destination node from the management and control system.
  • Step 202 Obtain attribute information of the shared risk link group SRLG corresponding to each OMS.
  • the SRLG corresponding to the aforementioned OMS refers to the SRLG to which the optical fiber carrying the OMS belongs. It can also be understood that the OMS is a logical link, and the SRLG is a physical link that carries the aforementioned logical link.
  • one OMS corresponds to one or more SRLGs, that is, one OMS may be borne by one SRLG, or may be borne by multiple SRLGs. For details, please refer to the related description corresponding to FIG. 1B above, which will not be repeated here.
  • the attribute of the SRLG refers to the property of one SRLG that is different from other SRLGs, and the property of the SRLG is determined by the optical fiber segment/optical cable segment in the SRLG.
  • the properties of the SRLG are properties that are determined when the fiber segment/cable segment is laid.
  • the attribute information of the SRLG includes attributes such as SRLG distance and SRLG type.
  • the risk of damage to the two optical cables due to road construction will be the same or similar in future road construction.
  • an excavator may cut two fiber optic cables at the same time during construction.
  • the length of the aforementioned optical cable segment ie 5km determines the SRLG distance of the SRLG, and the laying method of the aforementioned optical cable segment is convenient It is determined that the SRLG type is different cables in the same groove. Therefore, the attribute information of the SRLG can reflect the characteristics of the optical fiber segment/cable segment (eg, length, distribution location, etc.).
  • the entire fiber/cable segment may not function properly due to the failure of a small segment of the fiber segment/cable segment. Therefore, it is generally believed that the longer the length of the optical fiber segment/optical cable segment between two nodes, the greater the probability that the entire optical fiber segment/optical cable segment cannot work due to the failure of a small segment. That is, the longer the length of the fiber/cable segment, the greater the chance of failure.
  • attributes of the SRLG may also be regarded as attributes of the SRLG, for example, the risk coefficient of the SRLG type, etc., which are not specifically limited here.
  • the step of obtaining the attribute information of the SRLG corresponding to the OMS by path selection and transposition can be implemented in many different ways:
  • the path selection device may acquire the information of the optical fiber segment/optical cable segment corresponding to the OMS from the operator management device, and then the path selection device may use the aforementioned information on the optical fiber segment/optical cable segment corresponding to the OMS. Attribute information converted to SRLG.
  • the operator management device only stores the information of the OMS and the information of the optical fiber segment/optical cable segment corresponding to the OMS, but does not store the information of the SRLG corresponding to the OMS. That is to say, the operator management device stores the correspondence between the information of the OMS and the information of the optical fiber segment/optical cable segment.
  • the operator management device can search for the optical fiber segment/optical cable corresponding to the OMS based on the information of the OMS carried in the foregoing message.
  • Segment information for example, fiber number, fiber cable number, length of the fiber optic cable segment, number of the trench where the fiber optic cable segment is located, and so on.
  • the management and control system can directly perform signaling interaction with the operator's management device to obtain the information of the optical fiber segment/optical cable segment corresponding to each OMS. Then, the management and control system determines the attribute information of the SRLG according to the information of the optical fiber segments/cable segments of the multiple OMSs. Exemplarily, the optical fibers with the same optical cable number are set as an SRLG group, and the distance of the optical fibers is determined as the SRLG distance, and the SRLG type is determined as the same cable. Exemplarily, the numbered optical cables having the same groove are set as an SRLG group, the distance between the optical cables is determined as the SRLG distance, and the SRLG type is determined as the same groove. If the path selection device is a node in the ASON network, the node obtains the attribute information of the SRLG corresponding to each OMS from the management and control system.
  • the operator management device stores a correspondence table including the information of the OMS and the information of the optical fiber segment/optical cable segment.
  • the management and control system sends the OMS identifier to the operator management device
  • the operator management device can look up the aforementioned correspondence table according to the OMS identifier to obtain information of all optical fiber segments/cable segments corresponding to the OMS.
  • the correspondence table stored in the operator management device may be as shown in Table 1 below:
  • the route selection device Take the route selection device as the management and control system as an example to introduce.
  • the management and control system sends the identification of the OMS to the operator management device as OMS001
  • the operator management device will reply to the management and control system with the identification of the OMS (ie OMS001), the number of the optical fiber corresponding to the OMS (ie the fiber_ 101 and fiber_102), the numbers of the optical cables to which the aforementioned optical fibers belong (ie, cable_201 and cable_202), and the numbers of the grooves to which the aforementioned cables belong (ie, groove_301 and groove_301).
  • the management and control system sends the OMS identifiers OMS001, OMS002, and OMS003 to the operator management device
  • the operator management device will reply to the management and control system with the content shown in Table 1 above.
  • the management and control system will determine the attribute information of the SRLG corresponding to each OMS based on the information of the optical fiber segment/optical cable segment shown in Table 1.
  • the management and control system determines that optical fiber_103 and optical fiber_105 are located in the same SRLG, and determines that the SRLG The type is the same cable with different grooves.
  • the SRLG information corresponding to the OMS may be originally stored in the operator management device, and the path selection apparatus only obtains the attribute information of the SRLG corresponding to the OMS from the operator management device.
  • the operator management device stores the information of the OMS and the information of the SRLG corresponding to the OMS, that is, the operator management device stores the correspondence between the OMS and the SRLG. Therefore, when the path selection device sends a message carrying information of a certain OMS to the operator management device, the operator management device can search for the SRLG corresponding to the OMS based on the information of the OMS carried in the foregoing message, that is to say , the operator management device can find out the information of one or more SRLGs carrying the aforementioned OMS based on the information of the OMS.
  • the path selection device is a management and control system
  • the management and control system can directly perform signaling interaction with the operator management device to obtain attribute information of the SRLG corresponding to each OMS.
  • the path selection device is a node in the ASON network
  • the node obtains the attribute information of the SRLG corresponding to each OMS from the management and control system.
  • the attribute information of the SRLG corresponding to the OMS in the management and control system also comes from The operator manages the device.
  • the operator management device stores a correspondence table including OMS information and SRLG information, and the aforementioned OMS information and SRLG information are associated with the OMS identifier and the SRLG identifier.
  • the operator management device may search the aforementioned correspondence table according to the identification of the OMS, and obtain information of all SRLGs corresponding to the OMS. For example, if the OMS corresponds to 3 SRLGs, that is, the OMS is borne by the 3 SRLGs, the operator management device will obtain the attribute information of each of the foregoing 3 SRLGs from the management and control system.
  • the correspondence table stored in the operator management device may be as shown in Table 2 below:
  • the route selection device Take the route selection device as the management and control system as an example to introduce.
  • the management and control system sends the identification of the OMS to the operator management device as OMS001
  • the operator management device will reply to the management and control system with the identification of the OMS (ie OMS001), the identification of the two SRLGs corresponding to the OMS (ie SRLG111 and SRLG112) and the attribute information of the aforementioned two SRLGs.
  • the attribute information of the aforementioned two SRLGs includes: the attribute information of the SRLG identified as SRLG111 and the attribute information of the SRLG identified as SRLG112.
  • the attribute information of the SRLG refers to information that can reflect the attribute of the SRLG.
  • the attribute information of the SRLG includes information such as SRLG distance, SRLG type, and the like.
  • the SRLG distance refers to the length of the optical fiber segment/optical cable segment in a shared risk link group, and the optical fiber segment/optical cable segment in the same SRLG has the same or similar fault risk.
  • An SRLG may contain an optical fiber segment/optical cable segment, and in this case, the SRLG distance is the length of the optical fiber segment/optical cable segment located in the SRLG.
  • One SRLG may also contain two or more optical fiber segments/cable segments, in this case, the SRLG distance is the length of two or more side-by-side optical fiber segments/cable segments located in the SRLG. In general, the SRLG distances are different for different SRLGs.
  • the SRLG distance can reflect the length of the optical fiber segment/cable segment.
  • the SRLG type can reflect whether different optical fiber segments/cable segments are in the same cable or in the same channel.
  • SRLG types include overhead co-cable, pipeline co-cable, and pipeline co-ditch. Different SRLG types will introduce different degrees of failure risk. That is to say, if the SRLG distances of two SRLGs are the same, but the SRLG types of the two SRLGs are different, then when the two different SRLGs are used to form the target path, the introduced failure risks are different.
  • Step 203 Select a target path according to the attribute information of the SRLG.
  • the path selection device will refer to the attribute information of the SRLG corresponding to each OMS in the aforementioned OMS topology, and select at least one OMS from the aforementioned multiple OMSs to form a target path.
  • the target path is used to transmit service data from the source node to the destination node through at least one OMS in the first plurality of OMSs.
  • the target path includes N OMSs, where N is an integer greater than or equal to 1, and N is less than or equal to M.
  • the path selection device will acquire the attribute information of the SRLG corresponding to the OMS connected to the aforementioned source node, and then select one or more from the multiple OMSs connected to the aforementioned source node according to the attribute information of the SRLG corresponding to the aforementioned OMS OMS, and determine the node connected to the source node through the aforementioned OMS. Then, based on the selected node connected to the source node, the path selection device further searches for the OMS and the SRLG corresponding to the OMS until the destination node is found. At this time, multiple OMSs connecting the previous source node and the destination node constitute a target path.
  • the attribute information of the SRLG corresponding to the OMS is considered when selecting the target path for transmitting service data, that is, the actual situation of the optical fiber path corresponding to the OMS is considered.
  • the attribute information of the SRLG can reflect the failure risk situation of the actual optical fiber path. Therefore, screening the target path based on the attribute information of the SRLG is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • the path selection device may select the target path according to the SRLG distance.
  • the path selection device may calculate the cumulative SRLG distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs.
  • the SRLG cumulative distance is the cumulative sum of the SRLG distances of the SRLGs corresponding to all OMSs on a candidate path. For example, if there are 3 OMSs on the candidate path, and each OMS corresponds to 2 SRLGs, then the SRLGs corresponding to all OMSs on the candidate path are 6 SRLGs. At this time, the cumulative sum of the SRLGs of the candidate paths is the cumulative sum of the SRLG distances of the aforementioned six SRLGs.
  • the aforementioned candidate path refers to a path from the source node to a certain node in the OMS topology (ie, the OMS topology between the source node and the destination node).
  • the candidate path may not include the destination node, and at this time, the path selection device is searching for the destination node by calculating the candidate path.
  • the candidate path may also include a destination node. In this case, the path selection device just searches for the destination node and uses the destination node as the termination point.
  • the path selection device will determine whether the candidate path can be used as the target path according to the SRLG accumulated distance. Exemplarily, if the SRLG accumulated distance satisfies a preset condition, the candidate path corresponding to the SRLG accumulated distance may be determined as the target path. Exemplarily, when the cumulative distance of the SRLG is less than the first preset value, and the candidate path includes a destination node, the candidate path corresponding to the cumulative distance of the SRLG is determined as the target path.
  • the first preset value may be calculated by the operation and maintenance personnel according to experience, or may be calculated by the path selection device according to historical data, which is not specifically limited here. In addition, the first preset value may be a small fixed value, for example, 10km; it may also be a relative value, for example, the first preset value is the minimum SRLG cumulative distance among the currently calculated candidate paths . There is no specific limitation here.
  • node A is the source node
  • node E is the destination node
  • the OMS topology from the source node to the destination node includes: a second OMS connecting node A and node B, The first OMS connecting node A and node C, the sixth OMS connecting node B and node F, the third OMS connecting node C and node F, the fourth OMS connecting node C and node E, the connecting node F and node E The fifth OMS.
  • the path selection device will start searching from the source node.
  • the path selection device first obtains the SRLG distance of each SRLG corresponding to the first OMS connected to the source node and calculates the first cumulative sum, and the second OMS connected to the source node.
  • the corresponding SRLG distances of each SRLG are calculated, and the second cumulative sum is calculated.
  • the first cumulative sum refers to the cumulative sum of SRLG distances of all SRLGs corresponding to the first OMS. For example, if the first OMS includes 3 SRLGs, and the distance of each SRLG is 3 km, the first cumulative sum is 9 km.
  • the second cumulative sum refers to the cumulative sum of SRLG distances of all SRLGs corresponding to the second OMS.
  • the path selection device compares the aforementioned first cumulative sum with the second cumulative sum, and if the first cumulative sum is smaller than the second cumulative sum, determines the node (ie the node connected to the source node) through the first OMS C) is the first candidate node. Then, the path selection device acquires the SRLG distances of the respective SRLGs corresponding to the third OMS connected to the first candidate node (ie, node C), and calculates a third cumulative sum, and the first candidate node (ie, node C) The SRLG distance of each SRLG corresponding to the connected fourth OMS is calculated, and the fourth cumulative sum is calculated.
  • the path selection device calculates the aforementioned cumulative sum of SRLGs from node A to node F (ie, the sum of the first cumulative sum and the third cumulative sum), and the cumulative sum of SRLGs from node A to node E (ie, the first cumulative sum and the fourth cumulative sum)
  • the sum of the cumulative sums) and the SRLG cumulative sum (ie the second cumulative sum) of node A to node B are compared. If the cumulative sum of SRLGs from node A to node B is the smallest, the path selection device will determine node B as the second candidate node, and search for OMS based on node B. If the cumulative sum of SRLGs from node A to node F is the smallest, the path selection device will determine node F as the second candidate node, and search for OMS based on node F.
  • the path selection device will acquire the SRLG distances of the respective SRLGs corresponding to the fifth OMS connected to the second candidate node (ie, node F), and calculate the fifth cumulative sum.
  • the node connected to the second candidate node through the fifth OMS is the destination node (ie, node E), and the sum of the fifth cumulative sum and the third cumulative sum is less than the fourth cumulative sum, then determine the first A path formed by an OMS, the third OMS and the fifth OMS is the target path.
  • the first candidate node and the second candidate node are intermediate nodes between the source node and the destination node. It should be understood that the foregoing embodiments are only examples of determining the target path in an OMS topology with a small number of OMSs. In practical applications, there will be more intermediate nodes between the source node and the destination node, and the path selection device will determine more candidate nodes. However, the specific calculation method is similar to the aforementioned method.
  • the SRLG distance can reflect the length of the optical fiber segment/optical cable segment, and the longer the SRLG distance is, the longer the optical fiber segment/optical cable segment is, and the greater the risk of failure of the optical fiber segment/optical cable segment. Therefore, selecting a path with a smaller SRLG cumulative distance according to the SRLG distance is not only beneficial to control the fault risk, but also to find the fault point when a fault occurs.
  • the path selection apparatus will perform the following steps:
  • Step 401 Determine the OMS topology of the optical multiplexing section between the source node and the destination node.
  • Step 402 Obtain the SRLG distance of the SRLG corresponding to each OMS.
  • step 401 and step 402 are similar to the aforementioned step 201 and step 202 , for details, please refer to the relevant introduction in the aforementioned step 201 and step 202 , and details are not repeated here.
  • Step 403 Determine the target path according to the SRLG distance of each SRLG in the working path and the SRLG distance of the SRLG corresponding to each OMS in the OMS topology.
  • the working path may be a path that exists before calculating the target path, or may be a working path calculated by the path selection device using the method in the embodiment corresponding to FIG. 2 , which is not specifically limited here.
  • the path selection device needs to determine the attribute information of each SRLG corresponding to each OMS on the working path, so that when calculating the target path (ie, the protection path), try to avoid overlapping with the SRLG in the working path, and also Try to avoid the risk of failures affecting the working path.
  • the target path ie, the protection path
  • the path selection device selects the target path for the working path based on the SRLG distance in the following ways:
  • the path selection device selects the target path according to the SRLG coincidence distance.
  • the SRLG coincidence distance is the cumulative sum of the SRLG distances of the same SRLG between a candidate path and a working path. For example, if the working path includes three SRLGs, SRLG_a, SRLG_b, and SRLG_c, and the candidate path includes SRLG_b, SRLG_c, SRLG_d, and SRLG_e, then the SRLGs with the same working path and the candidate path are SRLG_c and SRLG_d. At this time, the SRLG overlap distance is SRLG_c The cumulative sum of the SRLG distance and the SRLG distance of SRLG_d.
  • the path selection apparatus will calculate the SRLG coincidence distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs. Wherein, each of the candidate paths includes at least one OMS. Then, the path selection device will judge whether the candidate path can be used as the target path according to the SRLG coincidence distance. Exemplarily, if the SRLG coincidence distance satisfies a preset condition, the candidate path corresponding to the SRLG coincidence distance may be determined as the target path. Exemplarily, when the SRLG coincidence distance is less than the second preset value, and the candidate path includes a destination node, the candidate path corresponding to the SRLG coincidence distance is determined as the target path.
  • the second preset value may be calculated by the operation and maintenance personnel according to experience, or may be calculated by the path selection device according to historical data, which is not specifically limited here.
  • the second preset value may be a small fixed value, for example, 2km or 0km; it may also be a relative value, for example, the second preset value is the minimum SRLG among the multiple candidate paths currently calculated Coincidence distance. There is no specific limitation here.
  • the OMS topology includes OMS_ab (ie the OMS between node A and node B), OMS_bd (ie the OMS between node B and node D), OMS_ac (ie the OMS between node A and node C), OMS_cd (ie OMS between node C and node D) and OMS_ad (ie OMS between node A and node D). It can also be understood that the OMS topology also includes nodes at both ends of each OMS.
  • FIG. 5B is an example of an SRLG topology diagram corresponding to the OMS topology shown in FIG. 5A .
  • OMS_ab corresponds to SRLG1, SRLG2 and SRLG3
  • OMS_bd corresponds to SRLG7
  • OMS_ac corresponds to SRLG1 and SRLG4
  • OMS_cd corresponds to SRLG5
  • OMS_ad corresponds to SRLG1, SRLG2 and SRLG6.
  • the path between node A and node B is working path A_B.
  • the path selection means will obtain the SRLG distance of each SRLG corresponding to the OMS connected to the source node (ie, node A). Specifically, it includes: the distances of the SRLGs of SRLG1, SRLG2, and SRLG3 corresponding to OMS_ab; the distances of the SRLGs of SRLG1, SRLG2, and SRLG6 corresponding to OMS_ad; and the distances of the SRLGs of SRLG1 and SRLG4 corresponding to OMS_ac. Among them, except OMS_ab is a working path, other OMSs are used to determine candidate paths.
  • OMS_ab and OMS_ad have two common SRLGs, namely SRLG1 and SRLG2.
  • OMS_ab and OMS_ac share one SRLG, namely SRLG1. Therefore, the path selection device can determine that the SRLG coincidence distance of the candidate path A_C (that is, the candidate path passing through OMS_ac) is smaller than the SRLG coincidence distance of the candidate path A_D (the candidate path passing through OMS_ad), and that node C and node D are not destination nodes ( i.e. Node B). Therefore, the path selection device will determine node C as a candidate node, and then the path selection device will continue to search for OMS based on node C.
  • the SRLG corresponding to the OMS_cd connected to the node C is SRLG5.
  • the candidate path A_C_D that is, the candidate path passing through OMS_ac and OMS_cd
  • the working path A_B also have only one SRLG in common, that is, SRLG1. Therefore, the SRLG coincidence distance of the candidate path A_C_D is smaller than the SRLG coincidence distance of the candidate path A_C, and node C and node D are not destination nodes (ie, node B). Therefore, the path selection device will determine node D as a candidate node, and then the path selection device will continue to search for OMS based on node D.
  • the SRLG corresponding to the OMS_db connected to the node D is SRLG7.
  • the candidate path A_C_D_B that is, the candidate path passing through OMS_ac, OMS_cd, and OMS_db
  • the working path A_B also have only one SRLG in common, that is, SRLG1. Therefore, the SRLG coincidence distance of the candidate path A_C_D_B is smaller than the SRLG coincidence distance of the candidate path A_C, and the other end of the OMS_db is the node B (ie, the destination node).
  • the path selection device will determine the candidate path A_C_D_B as the protection path of the working path A_B, so that when the working path A_B fails, the candidate path A_C_D_B replaces the working path A_B to transmit service data.
  • the SRLG distance of the same SRLG between the candidate path and the working path is considered when the target path is selected, and the candidate path with less same SRLG between the working path and the working path is selected as much as possible (that is, the SRLG coincidence distance is selected. smaller candidate paths). Therefore, the target path determined by the path selection device can avoid overlapping with the SRLG of the working path as much as possible, which is beneficial to reduce the probability that the protection path is affected by the failure of the working path.
  • the path selection device selects the target path according to the SRLG coincidence distance and the SRLG accumulated distance.
  • the candidate path corresponding to the SRLG coincidence distance and the SRLG accumulated distance may be determined as the target path. For example, if the SRLG overlap distance is less than the second preset value, and the SRLG cumulative distance is less than the third preset value, and the candidate path includes the destination node, then determine the candidate path corresponding to the SRLG cumulative distance as the Target path.
  • the third preset value may be calculated by the operation and maintenance personnel according to experience, or may be calculated by the path selection device according to historical data, which is not specifically limited here.
  • the third preset value may be a small fixed value, for example, 10km; it may also be a relative value, for example, the third preset value may be the minimum SRLG cumulative distance among the currently calculated candidate paths . There is no specific limitation here.
  • the path selection device may also consider the SRLG overlap distance first and then consider the SRLG accumulated distance. For example, a candidate path with a smaller SRLG overlap distance is preferentially selected.
  • the SRLG cumulative distance of the aforementioned multiple candidate paths ie, candidate paths with the same or similar SRLG coincidence distances. Then, from the multiple candidate paths with the same or similar SRLG coincidence distance, the candidate path with the smaller SRLG cumulative distance is selected as the target path.
  • the path selection device may also consider the SRLG cumulative distance first and then consider the SRLG coincidence distance. For example, a candidate path with a smaller SRLG cumulative distance is preferentially selected. If there are multiple candidate paths whose SRLG cumulative distances are the same or similar, the path selection can be performed again.
  • the SRLG coincidence distance of the aforementioned multiple candidate paths ie, candidate paths with the same or similar SRLG cumulative distance. Then, from multiple candidate paths with the same or similar SRLG cumulative distance, the candidate path with smaller SRLG coincidence distance is selected as the target path.
  • FIG. 5C is another example of the SRLG topology diagram corresponding to the OMS topology shown in FIG. 5A .
  • OMS_ab' corresponds to SRLG1 and SRLG2
  • OMS_bd' corresponds to SRLG6
  • OMS_ac' corresponds to SRLG1 and SRLG3
  • OMS_cd' corresponds to SRLG4
  • OMS_ad' corresponds to SRLG1 and SRLG5.
  • the path selection means will obtain the SRLG distance of each SRLG corresponding to the OMS connected to the source node (ie, node A). Among them, it specifically includes: the distance between SRLG1 and SRLG2 corresponding to OMS_ab'; the distance between SRLG1 and SRLG5 corresponding to OMS_ad'; the distance between SRLG1 and SRLG3 corresponding to OMS_ac'.
  • OMS_ab' and OMS_ad' share one SRLG, namely SRLG1.
  • OMS_ab' and OMS_ac' share one SRLG, namely SRLG1. Therefore, the path selection device needs to select a candidate path with a smaller SRLG overlap distance from the candidate paths with the same SRLG cumulative distance as the protection path. Therefore, the path selection means will continue to search for the OMS based on node C and node D, respectively.
  • the SRLG corresponding to the OMS_cd' connected to the node C is SRLG4.
  • the SRLG corresponding to the OMS_db' connected to node D is SRLG6.
  • the path selection device determines that the candidate path A_D_B' is the protection path of the working path A_B', so that when the working path A_B' fails, the candidate path A_D_B' replaces the working path A_B' to transmit service data.
  • the path selection device may introduce a risk value so as to quantify the aforementioned calculation process.
  • risk value SRLG cumulative distance+SRLG overlap distance ⁇ SRLG overlap risk coefficient.
  • the risk value may also reflect the degree of influence on the protection path when the working path fails.
  • the SRLG coincidence risk coefficient is used to indicate the degree of influence of the SRLG coincidence distance on the failure risk of the candidate path.
  • the path selection device prioritizes the SRLG coincidence distance when determining the target path
  • the SRLG coincidence distance has a greater impact on the fault risk of the path than the SRLG cumulative distance
  • the SRLG coincidence risk coefficient can be set to a higher value. large value.
  • the SRLG coincidence risk coefficient is orders of magnitude larger than the SRLG cumulative distance.
  • the path selection device prioritizes the SRLG cumulative distance when determining the target path
  • the SRLG coincidence distance has a smaller impact on the fault risk of the path than the SRLG cumulative distance
  • the SRLG coincidence risk coefficient can be set to a higher value. small value.
  • the SRLG coincidence risk coefficient is orders of magnitude smaller than the SRLG cumulative distance.
  • risk value SRLG cumulative distance+SRLG overlap distance ⁇ M.
  • M is the SRLG coincidence risk coefficient.
  • M may be 100 or 1000, etc.
  • the path selection means determines the target path as the candidate path A_C_D_B.
  • risk value SRLG cumulative distance+SRLG overlap distance ⁇ M.
  • M is the SRLG coincidence risk coefficient.
  • M may be 100 or 1000, etc.
  • the path selection means determines the target path as the candidate path A_C_D_B.
  • the path selection apparatus not only needs to consider the SRLG distance, but also needs to consider SRLG attributes such as the SRLG type. Specifically, the path selection device will perform the following steps:
  • Step 601 Determine the OMS topology of the optical multiplex section between the source node and the destination node.
  • Step 602 Acquire the SRLG distance and SRLG type of the SRLG corresponding to each OMS.
  • steps 601 and 602 are similar to the foregoing steps 201 and 202.
  • steps 601 and 602 are similar to the foregoing steps 201 and 202.
  • steps 601 and 602 are similar to the foregoing steps 201 and 202.
  • steps 601 and 602 are similar to the foregoing steps 201 and 202.
  • Step 603 Determine the target path according to the SRLG distance and SRLG type of each SRLG in the working path and the candidate path.
  • the working path may be a path that exists before calculating the target path, or may be a working path calculated by the path selection device using the method in the embodiment corresponding to FIG. 2 , which is not specifically limited here. Specifically, please refer to the relevant introduction in the foregoing step 403, which is not repeated here.
  • SRLG types include overhead co-cable, pipeline co-cable and pipeline co-ditch.
  • Different SRLG types will introduce different degrees of failure risk. That is to say, if the SRLG distances of two SRLGs are the same, but the SRLG types of the two SRLGs are different, then when the two different SRLGs are used to form the target path, the introduced failure risks are different.
  • the failure risk of overhead co-cable is greater than that of pipeline co-cable
  • the failure risk of pipeline co-cable is greater than that of pipeline co-ditch.
  • overhead co-cable failure risk is greater than that of pipeline co-ditch.
  • this embodiment introduces a risk value, which is a quantified symbol for the SRLG distance and the SRLG type.
  • the risk value may be determined from the SRLG distance, the SRLG type, the risk factor for the SRLG type, and the SRLG coincidence risk factor.
  • the risk coefficient of the SRLG type is used to indicate the degree of failure risk that this SRLG type may introduce.
  • the risk coefficient of SRLG type of overhead co-cable is greater than that of SRLG type of pipeline co-cable
  • the risk coefficient of SRLG type of pipeline co-cable is greater than that of pipeline co-ditch SRLG type, which is not limited here.
  • the SRLG coincidence risk coefficient is used to indicate the degree of influence of the SRLG coincidence distance on the failure risk of the candidate path. Specifically, please refer to the introduction about the SRLG coincidence risk coefficient above, and will not repeat them here.
  • the path selection device may first determine the risk coefficient of each SRLG type and the SRLG coincidence risk coefficient. Then, the path selection device determines a risk value of at least one candidate path according to the SRLG distance, the SRLG type, the risk coefficient of the SRLG type, and the SRLG coincidence risk coefficient.
  • the risk value is equal to the sum of the SRLG cumulative distance, the first distance and the second distance, the first distance is the product of the SRLG coincidence distance and the coincidence risk coefficient, and the second distance is the SRLG distance of each SRLG and the SRLG Weighted sum of risk factors for SRLG types.
  • the risk value can be determined by the following formula:
  • the candidate path corresponding to the risk value is determined as the target path.
  • the coincidence risk coefficient can be greater than the risk coefficient of a certain SRLG type, which means that the risk introduced by the overlapping SRLG between the working path and the protection path is greater than the risk introduced by this SRLG type; the coincidence risk coefficient can also be smaller than a certain SRLG The risk coefficient of the type, indicating that the risk introduced by the overlapping SRLG between the working path and the protection path is smaller than the risk introduced by this SRLG type.
  • the aforementioned SRLG coincidence risk coefficient and the SRLG type risk coefficient may be adjusted according to the requirements of the transmission service, which is not specifically limited in this embodiment.
  • N 2 far greater than N 1 and N 1 far greater than M as an example, it can also be understood that the magnitude of N 2 is greater than that of N 1 , and the magnitude of N 1 is greater than that of M.
  • the path selection means determines the target path as the candidate path A_C_D_B.
  • attribute information of the SRLG such as the SRLG distance and the SRLG type
  • the attribute information of the SRLG can reflect the failure risk situation of the actual optical fiber path. Therefore, screening the target path based on the attribute information of the SRLG is beneficial to reduce the failure risk of the transmission path and improve the reliability of service transmission.
  • the solution that only considers the number of OMSs between the source node and the destination node and the solution that only considers the number of SRLGs between the source node and the destination node the solution of this application will refer to the solution of each SRLG.
  • Attribute information since the value of an attribute of different SRLGs is different, determining the target path based on the attribute information of the SRLG can truly and objectively reflect the situation of the SRLG (that is, the situation of the physical link), and thus can more accurately Avoid the risk of failure. Therefore, compared with the solution of the traditional technology, it is beneficial to reduce the failure risk of the transmission path.
  • FIG. 7 is a schematic structural diagram of the path selection apparatus 70 .
  • the path selection device 70 can be used to execute the methods in the above embodiments corresponding to FIG. 2 , FIG. 4 and FIG. 6 .
  • the path selection apparatus 70 may include a processor 710 , a memory 720 and a transceiver 730 .
  • the processor 710 is coupled to the memory 720
  • the processor 710 is coupled to the transceiver 730 .
  • the aforementioned transceiver 730 may also be referred to as a transceiver unit, a transceiver, a transceiver, or the like.
  • the device used to implement the receiving function in the transceiver unit may be regarded as a receiving unit
  • the device used to implement the transmitting function in the transceiver unit may be regarded as a transmitting unit, that is, the transceiver unit includes a receiving unit and a transmitting unit, and the receiving unit also It can be called a receiver, an input port, a receiving circuit, etc.
  • the sending unit can be called a transmitter, a transmitter, or a transmitting circuit, etc.
  • the transceiver 730 may be an optical module.
  • the aforementioned processor 710 may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP), or a combination of CPU and NP.
  • the processor may also be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general-purpose array logic (generic array logic, GAL) or any combination thereof.
  • the processor 710 may refer to one processor, or may include multiple processors.
  • the aforementioned memory 720 is mainly used for storing software programs and data.
  • the memory 720 may exist independently and be connected to the processor 710 .
  • the memory 720 may be integrated with the processor 710, for example, in one or more chips.
  • the memory 720 can store program codes for implementing the technical solutions of the embodiments of the present application, and is controlled and executed by the processor 710 .
  • the memory 720 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include non-volatile memory (non-volatile memory), such as read-only memory (read-only memory) only memory, ROM), flash memory (flash memory), hard disk drive (HDD) or solid-state drive (solid-state drive, SSD); the memory 720 may also include a combination of the above-mentioned types of memory.
  • volatile memory such as random-access memory (RAM)
  • the memory may also include non-volatile memory (non-volatile memory), such as read-only memory (read-only memory) only memory, ROM), flash memory (flash memory), hard disk drive (HDD) or solid-state drive (solid-state drive, SSD); the memory 720 may also include a combination of the above-mentioned types of memory.
  • the memory 720 may refer to one memory, or may include multiple memories.
  • computer-readable instructions are stored in the memory 720 , and the computer-readable instructions include a plurality of software modules, such as a sending module 721 , a processing module 722 and a receiving module 723 .
  • the processor 710 can perform corresponding operations according to the instructions of each software module.
  • an operation performed by a software module actually refers to an operation performed by the processor 710 according to the instruction of the software module.
  • the processing module 722 is configured to select a target path according to the attribute information of the SRLG, where the target path is used to transmit service data from the source node to the OMS through at least one OMS of the plurality of OMSs. destination node.
  • the processing module 722 is further configured to calculate the SRLG cumulative distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs; and, when the SRLG cumulative distance is less than a first preset value, and the candidate path If the destination node is included, the candidate path corresponding to the accumulated distance of the SRLG is determined as the target path.
  • the aforementioned sending module 721 is configured to send a request message to the operator management device, where the request message is used to obtain attribute information of the SRLG corresponding to one or more OMSs.
  • the foregoing receiving module 723 is configured to receive attribute information of the SRLG corresponding to one or more OMSs from the operator management device.
  • the aforementioned sending module 721 is configured to send a request message to the management and control system, where the request message is used to obtain the OMS correspondence between the source node and the destination node. Attribute information of the SRLG.
  • the aforementioned receiving module 723 is configured to receive the attribute information of the SRLG corresponding to one or more OMSs from the management and control system.
  • an embodiment of the present application provides a schematic structural diagram of a path selection apparatus 80 .
  • the foregoing method embodiments corresponding to FIG. 2 , FIG. 4 , and FIG. 6 may all be based on the structure of the path selection apparatus 80 shown in FIG. 8 .
  • the path selection device 80 includes a plurality of functional modules.
  • the aforementioned functional modules may be integrated into one processing unit, or each module may exist physically alone, or two or more modules may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
  • the path selection device 80 may be a management and control system for managing the ASON network or a functional module in the management and control system; the path selection device 80 may also be a functional module located in a certain computing node.
  • the path selection device 80 includes a determination module 801 , an acquisition module 802 , and a selection module 803 .
  • the determining module 801 is used to determine the OMS topology of the optical multiplexing section between the source node and the destination node, and the OMS topology includes multiple OMSs;
  • the obtaining module 802 is used to obtain the shared risk link group SRLG corresponding to each OMS
  • the selection module 803 is configured to select a target path according to the attribute information of the SRLG, where the target path is used to transmit service data from the source node to the destination node through at least one OMS of the plurality of OMSs.
  • the selection module 803 is specifically configured to: calculate the SRLG cumulative distance of at least one candidate path according to the SRLG distances corresponding to the multiple OMSs, where the SRLG cumulative distance is all OMSs on the candidate path The cumulative sum of the SRLG distances of the corresponding SRLGs; when the cumulative SRLG distance is less than the first preset value, and the candidate path includes the destination node, the candidate path corresponding to the cumulative SRLG distance is determined to be the target path.
  • the selection module 803 is specifically configured to: calculate the SRLG coincidence distance of at least one candidate path according to the SRLG distances corresponding to multiple OMSs, each of the candidate paths includes at least one OMS, the SRLG The coincidence distance is the cumulative sum of the SRLG distances of the same SRLG between a candidate path and a working path, and the working path is used to transmit service data from the source node to the destination node through at least one of the OMS; if the SRLG coincidence distance is less than the first two preset values, and if the candidate path includes the destination node, the candidate path corresponding to the SRLG coincidence distance is determined as the target path.
  • the selection module 803 is further configured to: calculate the SRLG cumulative distance of the candidate path according to the SRLG distance, where the SRLG cumulative distance is the SRLG distance of the SRLGs corresponding to all OMSs on the candidate path Cumulative sum; if the SRLG coincidence distance is less than the second preset value, and the SRLG accumulated distance is less than the third preset value, and the candidate path includes the destination node, then determine that the SRLG accumulated distance corresponding candidate path is the target path.
  • the attribute information further includes the SRLG type; the selection module 803 is specifically configured to: determine the risk coefficient of each SRLG type and the SRLG coincidence risk coefficient; according to the SRLG distance, the SRLG Type, the risk coefficient of the SRLG type, and the SRLG coincidence risk coefficient determine the risk value of at least one candidate path, and the SRLG coincidence risk coefficient is used to indicate the degree of risk when the candidate path coincides with the working path; If the value is set, and the candidate path includes the destination node, the candidate path corresponding to the risk value is determined as the target path.
  • each step of the above-mentioned method can be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art.
  • the storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, detailed description is omitted here. It should also be understood that the first, second, third, fourth and various numerical numbers involved in this document are only distinctions made for convenience of description, and are not used to limit the scope of the embodiments of the present application.
  • the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be dealt with in the embodiments of the present application. implementation constitutes any limitation.

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Abstract

申请实施例公开了一种路径选择方法以及路径选择装置，用于基于承载OMS的SRLG的属性信息，选择用于传输业务数据的目标路径。具体地，路径选择装置确定源节点到目的节点之间的光复用段OMS拓扑，并，获取每个该OMS对应的共享风险链路组SRLG的属性信息。然后，根据该SRLG的属性信息选择目标路径，该目标路径用于通过该多个OMS中的至少一个OMS将业务数据从该源节点传输至该目的节点。由于，SRLG的属性信息能够反映实际的物理光纤段/光缆段的属性，因此，根据SRLG的属性选择较低故障风险的目标路径，有利于提高业务传输的可靠性。

Description

一种路径选择方法以及路径选择装置
本申请要求于2020年11月18日提交中国国家知识产权局、申请号为202011293847.5、申请名称为“一种路径选择方法以及路径选择装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及光网络技术领域，尤其涉及一种路径选择方法以及路径选择装置。
背景技术
自动交换光网络(automatically switched optical network，ASON)技术是指在管控系统或ASON控制器的信令控制下，能够完成光网络连接自动交换功能，并具有网络资源按需动态配置能力的光传送网络。该ASON技术的核心是在光传送网络中引入控制平面，实现网络资源实时和动态地按需配置，优化对波分复用(wavelength division multiplexing，WDM)网络波长资源的使用，从而实现光网络的智能化。
在传统技术中，管控系统或ASON控制器基于光复用段(optical multiplex section，OMS)拓扑进行路径选择。具体地，管控系统或ASON控制器根据OMS的路由策略为待传输业务选择传输路径。但是，前述方案并未涉及承载OMS的光纤路径的实际情况，因此，基于前述方案确定的传输路径的故障风险无法预估，不利于保证业务传输的可靠性。
发明内容
本申请实施例提供了一种路径选择方法以及路径选择装置，用于基于承载OMS的共享风险链路组(shared risk link group，SRLG)的属性信息，选择用于传输业务数据的目标路径。由于，SRLG的属性信息能够反映实际的物理光纤段/光缆段的属性，因此，根据SRLG的属性选择较低故障风险的目标路径，有利于提高业务传输的可靠性。
第一方面，本申请提供了一种路径选择方法，该路径选择方法可以应用于已知源节点和目的节点选择工作路径的场景，也可以应用于已知源节点、目的节点和工作路径来选择保护路径的场景。在该方法中，路径选择装置将先确定源节点到目的节点之间的光复用段OMS拓扑，该OMS拓扑包括多个OMS。然后，该路径选择装置再获取每个该OMS对应的共享风险链路组SRLG的属性信息。然后，该路径选择装置根据该SRLG的属性信息选择目标路径，其中，该目标路径用于通过该多个OMS中的至少一个OMS将业务数据从该源节点传输至该目的节点。当该目标路径是工作路径时，该目标路径用于将业务数据从源节点传输至目的节点；当该目标路径是某条工作路径的保护路径(或备用路径)时，该目标路径用于在工作路径出现故障时代替工作路径将前述业务数据传输从源节点传输至目的节点。
应当理解的是，前述方案可以由管理ASON网络的管控系统执行，也可以由ASON网 络中的某个节点(例如，前述源节点)执行。当前述方案由管控系统执行时，确定源节点到目的节点之间的光复用段OMS拓扑的步骤，可以理解为，管控系统从该管控系统内部存储的整个OMS拓扑中筛选出源节点到目的节点之间的OMS拓扑。当前述方案由某个节点执行时，确定源节点到目的节点之间的OMS拓扑的步骤，可以理解为，该节点从管控系统获取源节点到目的节点之间的OMS拓扑。
还应理解的是，前述源节点到目的节点之间的光复用段OMS拓扑包括多个与源节点有直接或间接连接关系的OMS，也包括与目的节点有直接和间接连接关系的OMS，并且，该OMS拓扑中存在多个OMS能够相互连接而构成从源节点到目的节点的通路。
还应理解的是，前述OMS对应的SRLG指的是承载OMS的光纤所属的SRLG，也可以理解为，OMS是逻辑链路，SRLG是承载前述逻辑链路的物理链路。一般地，一个OMS对应着一个或多个SRLG，也就是说，一个OMS可以由一个SRLG承载，也可以又多个SRLG承载。
本实施例中，由于在选择传输业务数据的目标路径时，考虑了OMS对应的SRLG的属性信息，也就是说，考虑了承载OMS的光纤路径的实际情况。该SRLG的属性信息能够反映实际光纤路径的故障风险情况，因此，基于SRLG的属性信息筛选目标路径有利于降低传输路径故障风险，提高业务传输的可靠性。相比于传统技术中，仅考虑源节点与目的节点之间的OMS的个数的方案和仅考虑源节点与目的节点之间的SRLG的个数的方案，本申请的方案将参考各个SRLG的属性信息，由于不同SRLG的某一项属性的取值是不同的，因此，基于SRLG的属性信息确定目标路径能够真实客观地反映SRLG的情况(即物理链路的情况)，进而能够较为准确地避开故障风险。因此，相比于传统技术的方案有利于降低传输路径的故障风险。
在一种可选的实施方式中，该属性信息包括SRLG距离。
本实施方式中，提出SRLG的属性信息为SRLG的SRLG距离，该SRLG距离指在一个共享风险链路组内的光纤段/光缆段的长度，在同一个SRLG中的光纤段/光缆段有着相同或相近的故障风险。一个SRLG中可以包含一条光纤段/光缆段，此时，该SRLG距离为位于该SRLG中的这一条光纤段/光缆段的长度。一个SRLG也可以包含两条或多条光纤段/光缆段，此时，该SRLG距离为位于该SRLG中的两条或多条并排的光纤段/光缆段的长度。由于，不同SRLG的SRLG距离是不同的，因此，在确定目标路径时需要考虑SRLG距离，而不仅仅是考虑SRLG的个数或者OMS的个数。由于，光纤段/光缆段大多是以SRLG的形式铺设的，若已知SRLG个数和每个SRLG的SRLG距离的，则能够推断出实际物理光纤链路的情况。因此，有利于路径选择装置筛选出具有较低故障风险的目标路径。
在另一种可选的实施方式中，每个该OMS对应一个或多个SRLG。前述路径选择装置根据该SRLG的属性信息选择目标路径，包括：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离，该SRLG累计距离为一条该候选路径上全部OMS对应的SRLG的SRLG距离累积和；当该SRLG累计距离小于第一预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
本实施方式中，将计算至少一条候选路径的SRLG累计距离，即将某一条路径上的全 部SRLG的SRLG距离求和。该SRLG累计距离可以反映实际光纤路径的长度。前述SRLG累计距离越短，则可以推断出该条路径中的实际光纤路径的长度越短。一般地，实际光纤路径越短，出现故障的风险越低。因此，可以选择较小的SRLG累计距离对应的候选路径作为目标路径，以确保降低目标路径的故障风险。
应当理解的是，前述候选路径不仅包括从源节点到目的节点的通路，还包括从源节点到某个中间节点的通路。也就是说，路径选择装置在确定目标路径的过程中，会从源节点不断地向目的节点方向搜索OMS和中间节点。在此过程中，若某一条从源节点到中间节点的路径的SRLG累计距离已经大于第一预设值，则该路径选择装置可以不再基于该候选路径的中间节点向目的节点搜索。在这样的实现方式中，该路径选择装置并没有将从源节点到目的节点的每一条路径均查找出来，而是基于源节点搜索出累计SRLG小于第一预设值的路径，因此，能够降低计算量，降低路径选择装置的计算负荷。
具体地，在根据SRLG距离选择目标路径时，可以采用如下方式实现：
在一种可能的实施方式中，该根据该SRLG的属性信息选择目标路径，包括：该路径选择装置先获取与该源节点连接的第一OMS对应的各个SRLG的SRLG距离并计算第一累计和，以及与该源节点连接的第二OMS对应的各个SRLG的SRLG距离，并计算第二累计和。其中，第一累计和指该第一OMS对应的全部SRLG的SRLG距离累计和。类似的，第二累计和指该第二OMS对应的全部SRLG的SRLG距离累计和。然后，该路径选择装置将前述第一累计和与第二累计和比对，若该第一累计和小于该第二累计和，则确定通过该第一OMS与该源节点连接的节点为第一候选节点。然后，该路径选择装置获取与该第一候选节点连接的第三OMS对应的各个SRLG的SRLG距离，并计算第三累计和，以及与该第一候选节点连接的第四OMS对应的各个SRLG的SRLG距离，并计算第四累计和。然后，该路径选择装置将前述第三累计和与第四累计和比对，若该第三累计和小于该第四累计和，且，通过该第四OMS与该第一候选节点连接的节点为该目的节点，则确定通过该第三OMS与该第一候选节点连接的节点为第二候选节点。然后，该路径选择装置将获取与该第二候选节点连接的第五OMS对应的各个SRLG的SRLG距离，并计算第五累计和。若通过该第五OMS与该第二候选节点连接的节点为该目的节点，且，该第五累计和与第三累计和的总和小于该第四累计和，则确定该第一OMS、该第三OMS以及该第五OMS构成的路径为该目标路径。
本实施方式中，第一候选节点和第二候选节点为源节点与目的节点之间的中间节点。应当理解的是，前述实施方式仅仅是在OMS数量较少的OMS拓扑中确定目标路径的过程。在实际应用中，源节点与目的节点之间将存在更多的中间节点，该路径选择装置将确定出更多的候选节点。但是，具体的计算方式与前述方式相似。
在另一种可能的实施方式中，该根据该SRLG的属性信息选择目标路径，包括：根据该源节点和第一节点，获取该源节点与该第一节点之间的第一OMS对应的SRLG距离；根据该源节点和第二节点，获取该源节点与该第二节点之间的第二OMS对应的SRLG距离；若该第一OMS对应的SRLG距离小于该第二OMS对应的SRLG距离，则根据该第一节点和第三节点，获取该第一节点与该第三节点之间的第三OMS对应的SRLG距离，并 根据该第一节点和该目的节点，获取该第一节点和该目的节点之间的第四OMS对应的SRLG距离；若该第三OMS对应的SRLG距离小于该第四OMS对应的SRLG距离，则根据该第三节点和该目的节点，获取该第三节点与该目的节点之间的第五OMS对应的SRLG距离；若该第三OMS对应的SRLG距离与该第五OMS对应的SRLG距离的和小于该第四OMS对应的SRLG距离，则确定该第一OMS、该第三OMS以及该第五OMS构成的路径为该目标路径。
本实施方式中，第一节点、第二节点、第三节点为源节点与目的节点之间的中间节点。应当理解的是，前述实施方式仅仅是在OMS数量较少的OMS拓扑中确定目标路径的过程。在实际应用中，源节点与目的节点之间将存在更多的中间节点，该路径选择装置将确定出更多的候选节点。但是，具体的计算方式与前述方式相似。
在另一种可选的实施方式中，每个该OMS对应一个或多个SRLG。该根据该SRLG的属性信息选择目标路径，包括：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离，每条该候选路径包括至少一个OMS，该SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和，该工作路径用于将业务数据从该源节点通过至少一个该OMS传输至该目的节点；若该SRLG重合距离小于第二预设值，且，该候选路径包括该目的节点，则确定该SRLG重合距离对应的候选路径为该目标路径。
本实施方式中，提出在已知工作路径的情况下，该路径选择装置可以基于SRLG距离确定该工作路径的保护路径。由于保护路径用于在工作路径出现故障时代替工作路径传输业务数据，因此，该工作路径在出现故障时应当尽可能不影响到保护路径。也就是说，工作路径和保护路径应当尽可能的分离或互不干扰。从SRLG的角度来说，构成工作路径的各个SRLG与构成保护路径的各个SRLG之间应尽可能避免有相同的SRLG。即使该工作路径和保护路径之间没有完全SRLG分离，该工作路径和保护路径共用的SRLG的距离也应当尽量地短。因此，可以通过计算SRLG重合距离来选择目标路径，即工作路径的保护路径。
在传统的方案中，一般是由运维人员选择与工作路径完全SRLG分离的路径作为保护路径，若不存在与工作路径完全SRLG分离的路径时，常基于预设的OMS路由策略选择保护路径。例如，选择源节点与目的节点之间包含最少OMS数量的路径作为传输业务数据的路径。例如，若从源节点到目的节点的候选路径A需要经过3个OMS，而从源节点到目的节点的候选路径B仅需要经过2个OMS，那么，按照传统技术的方案会选择候选路径B作为最终的传输业务数据的路径。由于预设的OMS路由策略仅参考了OMS的个数，没有考虑SRLG的SRLG距离等属性，因此不利于筛选出具有较低风险的目标路径。而本实施方式中的方案可以在查找不到完全SRLG分离的路径时，筛选出SRLG重合距离尽量小的路径作为目标路径，能够在一定程度上降低目标路径出现故障的风险，进而提高业务数据传输的可靠性。
应当理解的是，本实施方式中的工作路径可以是采用本实施方式之前的方式确定的，也可以是运维人员人为选择的，具体此处不做限定。
在另一种可选的实施方式中，该方法还包括：根据该SRLG距离计算该候选路径的 SRLG累计距离，该SRLG累计距离为该候选路径上全部OMS对应的SRLG的SRLG距离累积和；若该SRLG重合距离小于该第二预设值，且该SRLG累计距离小于第三预设值，且该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
本实施方式中，还提出同时考虑SRLG重合距离和SRLG累计距离，可以在具有相同长度的SRLG累计距离的若干候选路径中，选择SRLG重合距离较小的候选路径作为目标路径；类似的，可以在具有相同长度的SRLG重合距离的若干候选路径中，选择SRLG累计距离较小的候选路径作为目标路径。有利于进一步降低目标路径的故障风险，进而提高业务数据传输的可靠性。
在另一种可选的实施方式中，该属性信息还包括SRLG类型；该根据该SRLG的属性信息选择目标路径，包括：确定每种该SRLG类型的风险系数以及存在该SRLG重合距离的风险系数；根据该SRLG距离、该SRLG类型、该SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值，该SRLG重合风险系数用于指示该候选路径与工作路径重合时的风险程度；若该风险值小于第四预设值，且，该候选路径包括该目的节点，则确定该风险值对应的候选路径为该目标路径。
本实施方式中，提出该SRLG的属性信息除了包括前述SRLG距离以外，该SRLG属性信息还包括SRLG类型，不同SRLG类型将引入不同程度的故障风险。也就是说，若两个SRLG的SRLG距离相同，但这两个SRLG的SRLG类型不同，那么，在采用这两个不同的SRLG构成目标路径时，引入的故障风险是不同的。可选的，该SRLG类型包括架空同缆、管道同缆以及管道同沟。一般地，架空同缆的故障风险大于管道同缆的故障风险，管道同缆的故障风险大于管道同沟的故障风险，当然，架空同缆的故障风险大于管道同沟的故障风险。为了将SRLG距离和SRLG类型均作为选择目标路径的参考因素，本实施方式引入了风险值，该风险值是对SRLG距离和SRLG类型的量化符号。当该风险值越大时，则该候选路径的故障风险越大，应尽量避免选择；当该风险值越小时，则该候选路径的故障风险越小，可以考虑选择。
第二方面，本申请提供了一种路径选择装置，该路径选择装置可以是管理ASON网络的管控系统或该管控系统中的功能模块；该路径选择装置也可以是位于某个计算节点中的功能模块。具体地，该路径选择装置包括确定模块、获取模块、选择模块。其中，确定模块，用于确定源节点到目的节点之间的光复用段OMS拓扑，该OMS拓扑包括多个OMS；获取模块，用于获取每个该OMS对应的共享风险链路组SRLG的属性信息；选择模块，用于根据该SRLG的属性信息选择目标路径，该目标路径用于通过该多个OMS中的至少一个OMS将业务数据从该源节点传输至该目的节点。
本实施例中，由于，路径选择装置在选择传输业务数据的目标路径时，考虑了OMS对应的SRLG的属性信息，也就是说，考虑了承载OMS的光纤路径的实际情况。该SRLG的属性信息能够反映实际光纤路径的故障风险情况，因此，基于SRLG的属性信息筛选目标路径有利于降低传输路径故障风险，提高业务传输的可靠性。相比于传统技术中，仅考虑源节点与目的节点之间的OMS的个数的方案和仅考虑源节点与目的节点之间的SRLG的个数的方案，本申请的方案将参考各个SRLG的属性信息，由于不同SRLG的某一项属 性的取值是不同的，因此，基于SRLG的属性信息确定目标路径能够真实客观地反映SRLG的情况(即物理链路的情况)，进而能够较为准确地避开故障风险。因此，相比于传统技术的方案有利于降低传输路径的故障风险。
在一种可选的实施方式中，该属性信息包括SRLG距离。
在另一种可选的实施方式中，每个该OMS对应一个或多个SRLG。该选择模块，具体用于：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离，该SRLG累计距离为一条该候选路径上全部OMS对应的SRLG的SRLG距离累积和；当该SRLG累计距离小于第一预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，每个该OMS对应一个或多个SRLG。该选择模块，具体用于：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离，每条该候选路径包括至少一个OMS，该SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和，该工作路径用于将业务数据从该源节点通过至少一个该OMS传输至该目的节点；若该SRLG重合距离小于第二预设值，且，该候选路径包括该目的节点，则确定该SRLG重合距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，该选择模块，还用于：根据该SRLG距离计算该候选路径的SRLG累计距离，该SRLG累计距离为该候选路径上全部OMS对应的SRLG的SRLG距离累积和；若该SRLG重合距离小于该第二预设值，且，该SRLG累计距离小于第三预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，该属性信息还包括SRLG类型。该选择模块，具体用于：
确定每种该SRLG类型的风险系数以及SRLG重合风险系数；根据该SRLG距离、该SRLG类型、该SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值，该SRLG重合风险系数用于指示该候选路径与工作路径重合时的风险程度；若该风险值小于第四预设值，且，该候选路径包括该目的节点，则确定该风险值对应的候选路径为该目标路径。
在另一种可选的实施方式中，该SRLG类型包括架空同缆、管道同缆以及管道同沟。
需要说明的是，本申请实施例还有多种具体其他实施方式，具体可参见第一方面的具体实施方式和其有益效果，在此不再赘述。
第三方面，本申请还提供了一种路径选择装置，该路径选择装置包括处理器，该处理器和存储器耦合，该存储器存储有程序，当该存储器存储的程序指令被该处理器执行时使得该路径选择装置实现如前述第一方面任意一种实施方式所介绍的方法。
第四方面，本申请还提供了一种计算机可读存储介质，包括计算机程序，该计算机序被处理器执行以实现如前述第一方面任意一种实施方式所介绍的方法。
第五方面，本申请还提供了一种包含指令的计算机程序产品，该计算机程序产品包括计算机程序代码，当该计算机程序代码在计算机上运行时，使得计算机执行如前述第一方面任意一种实施方式所介绍的方法。
从以上技术方案可以看出，本申请实施例具有以下优点：
本申请实施例中，当有业务请求需要从源节点向目的节点传输业务数据时，路径选择装置将先确定源节点到目的节点之间的光复用段OMS拓扑。然后，获取每个所述OMS对应的共享风险链路组SRLG的属性信息，所述属性信息包括SRLG距离。然后，根据所述SRLG距离确定传输业务数据的目标路径。由于，在选择传输业务数据的目标路径时，考虑了OMS对应的SRLG的属性信息，也就是说，考虑了OMS对应的光纤路径的实际情况。该SRLG的属性信息能够反映实际光纤路径的故障风险情况，因此，基于SRLG的属性信息筛选目标路径有利于降低传输路径故障风险，提高业务传输的可靠性。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例。
图1A为本申请实施例中路径选择方法的一个网络架构图；
图1B为本申请实施例中路径选择方法的另一个网络架构图；
图2为本申请实施例中路径选择方法的一个流程图；
图3为本申请实施例中OMS拓扑的一个示例图；
图4为本申请实施例中路径选择方法的另一个流程图；
图5A为本申请实施例中OMS拓扑的另一个示例图；
图5B为本申请实施例中SRLG拓扑的一个示例图；
图5C为本申请实施例中SRLG拓扑的另一个示例图；
图6为本申请实施例中路径选择方法的另一个流程图；
图7为本申请实施例中路径选择装置的一个实施例示意图；
图8为本申请实施例中路径选择装置的另一个实施例示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本申请实施例提供了一种路径选择方法以及路径选择装置，用于基于承载OMS的共享风险链路组SRLG的属性信息，选择用于传输业务数据的目标路径。由于，能够根据SRLG的属性选择较低故障风险的目标路径，有利于降低传输路径故障风险，提高业务传输的可 靠性。
下面对本申请实施例提出的路径选择方法的系统架构进行介绍：
如图1A所示，为本申请实施例提出的路径选择方法的系统架构图。该系统包括管控系统/ASON控制器101、ASON网络102和运营商管理设备103。
其中，ASON网络102包括多个节点以及连接前述各个节点的OMS，前述各个节点之间通过OMS传输业务数据。例如，节点A和节点D通过OMS6连接，该节点A能够通过前述OMS6将业务数据传输至节点D。由于前述ASON网络中有多个OMS，当确定了一个OMS的情况下，也就确定了该OMS两端的节点。因此，本申请实施例将由ASON网络中的各个OMS与节点的连接情况称为OMS拓扑。在实际应用中，前述节点可以理解为需要使用业务数据的站点，或者，能够中转业务数据的站点，具体此处不做限定。另外，本申请所介绍的节点还可以是数据传输网络中的网元以及其他能够中转或处理业务数据的装置或设备，具体此处不做限定。
管控系统/ASON控制器101用于对前述ASON网络102中的各个节点进行管理，包括向ASON网络102中的各个节点发送控制信令，以及收集ASON网络102中各个节点的信息。例如，该管控系统/ASON控制器101向ASON网络102中的节点A发送控制指令，以指示该节点A向节点C传输业务数据，那么，该节点A将通过OMS7将业务数据从节点A传输至节点C。此外，前述管控系统/ASON控制101还可以与运营商管理设备103通信，以使得管控系统/ASON控制器101能够将ASON网络中各个OMS的信息提供至运营商管理设备103，也可以使运营商管理设备103向管控系统/ASON控制器101提供关于承载前述各个OMS的光纤的信息。
应当注意的是，前述图1A中的各个OMS可以理解为是各节点之间的逻辑链路，而承载前述OMS的物理链路由光纤连接而成。由于铺设光纤的特性，即多条光纤封装于一条光缆中，而多条光缆并排地铺设于管道中或架空于空中。因此，在前述ASON网络中，虽然OMS拓扑中的两个OMS分别连接的是不同节点，但是，承载前述两个OMS的光缆可能是并排铺设的，或者，由同一段光纤承载前述两个OMS。以图1B为例，图1B为承载前述图1A所示的OMS拓扑对应的物理链路图，其中，F点表示光交换箱。其中，节点A和节点C之间的OMS7由光缆段AF和光缆段FC承载；节点A和节点B之间的OMS1由光缆段AF和光缆段FB承载。由此可知，承载OMS7的物理链路与承载OMS1的物理链路包括了共同的光缆段AF，这种两条并排的有着相同或相近的故障风险的光缆段被称为共享风险链路组(shared risk link group，SRLG)，在同一SRLG中不同光纤段/光缆段具有相同或相近的故障风险。由此可知，一个OMS与一个或多个SRLG对应，也可以理解为，一个OMS由一个或多个SRLG承载。例如，节点A和节点C之间的逻辑链路为OMS7，而承载前述OMS7的物理光纤链路包括SRLG1和SRLG3。其中，SRLG1与SRLG3通过光交换箱(即点F)连接。又例如，节点A和节点B之间的逻辑链路为OMS1，而承载前述OMS1的物理光纤链路包括SRLG1和SRLG2。其中，SRLG1与SRLG3通过光交换箱(即点F)连接。
还应注意的是，在实际应用中，两个节点之间可能存在两个并列的OMS。例如，如图 1A所示，从节点A到节点B的业务数据可以通过OMS1传输，也可以通过OMS8传输。但是，不同的OMS对应的SRLG不完全相同，也就是说，连接节点A和节点B的物理链路不完全相同。例如，承载前述OMS1的物理光纤链路包括SRLG1和SRLG2；而承载前述OMS8的物理光纤链路为SRLG8。
应当理解的是，图1A和图1B仅是为便于介绍方案而列举的示例，在实际应用中，OMS拓扑将包括更多的OMS，并且，OMS与SRLG的对应关系也将更加复杂。
由于，前述运营商管理设备103中存储有OMS的信息以及承载前述OMS的物理链路的信息，因此，该管控系统/ASON控制101可以从前述运营商管理设备103中获取到前述承载OMS的物理链路的信息(例如，SRLG的属性信息)，进而能够基于承载OMS的物理链路的信息(例如，SRLG的属性信息)选择目标路径。
如图2所示，为本申请提出的路径选择方法的一种实施例，在该方法中，当需要计算从源节点到目标节点之间的目标路径时，该路径选择装置将执行如下步骤：
步骤201、确定源节点到目的节点之间的光复用段OMS拓扑。
其中，源节点是传输业务数据的起点，目的节点是传输业务数据的终点。前述源节点到目的节点之间的OMS拓扑指包括多个与源节点有直接或间接连接关系的OMS，也包括与目的节点有直接和间接连接关系的OMS，并且，该OMS拓扑中存在多个OMS能够相互连接而构成从源节点到目的节点的通路。
以前述图1A为例，若节点A为源节点，节点D为目的节点，则节点A可以通过OMS6直接与节点D连通；该节点A也可以通过OMS5、节点E以及OMS4与节点D间接连通；该节点A也可以通过OMS7、节点C以及OMS3与节点D间接连接；该节点A还可以通过OMS1、节点B、OMS2、节点C以及OMS3与节点D间接连接。因此，该图1A所示的网络拓扑可以理解为是从源节点(即节点A)到目的节点(即节点D)之间的OMS拓扑。
本实施例中，该路径选择装置可以是管理ASON网络的管控系统，也可以是ASON网络中的某个节点(例如，前述源节点)。当路径选择装置为管控系统时，确定源节点到目的节点之间的OMS拓扑的步骤，可以理解为，管控系统从该管控系统内部存储的整个OMS拓扑中筛选出从源节点到目的节点之间的OMS拓扑。当路径选择装置为某个节点时，确定源节点到目的节点之间的OMS拓扑的步骤，可以理解为，该节点从管控系统获取源节点到目的节点之间的OMS拓扑。
步骤202、获取每个OMS对应的共享风险链路组SRLG的属性信息。
其中，前述OMS对应的SRLG指的是承载该OMS的光纤所属的SRLG，也可以理解为，OMS是逻辑链路，SRLG是承载前述逻辑链路的物理链路。一般地，一个OMS对应着一个或多个SRLG，也就是说，一个OMS可以由一个SRLG承载，也可以又多个SRLG承载。具体请参阅前文图1B对应的相关描述，此处不再赘述。
其中，SRLG的属性指一个SRLG区别于其他SRLG的性质，该SRLG的性质是由该SRLG中的光纤段/光缆段确定的。可选的，该SRLG的性质是在铺设光纤段/光缆段时就确定的性质。示例性的，该SRLG的属性信息包括SRLG距离、SRLG类型等属性。
例如，将两条5km的光缆段并排铺设于同一条沟中，那么，在以后道路施工时，这两 条光缆因道路施工而被破坏的风险是相同或相近的。例如，挖掘机在施工时可能同时将两条光缆挖断。此时，若将这两条光缆段视作是一个共风险的组合(即SRLG)，那么，前述光缆段的长度(即5km)便确定了该SRLG的SRLG距离，前述光缆段的铺设方式便确定了SRLG类型为同沟不同缆。因此，SRLG的属性信息能够反映光纤段/光缆段的特性(例如，长度、分布位置等)。另外，由于光纤段/光缆段中的某一小段出现故障，那么整条光纤段/光缆段可能都无法正常工作。因此，一般认为，两个节点之间的光纤段/光缆段的长度越长，因某一小段出现故障而导致整条光纤段/光缆段无法工作的几率越大。也就是说，光纤段/光缆段的长度越长，出现故障的几率越大。
在实际应用中，还可以将SRLG的其他特性也视作SRLG的属性，例如，SRLG类型的风险系数等，具体此处不做限定。
本实施例中，路径选择转置获取OMS对应的SRLG的属性信息的步骤可以有多种不同的实现方式：
在一种可选的实现方式中，可以是路径选择装置从运营商管理设备获取OMS对应的光纤段/光缆段的信息，然后，由路径选择装置将前述OMS对应的光纤段/光缆段的信息转换为SRLG的属性信息。
在这种实现方式中，运营商管理设备仅存储有OMS的信息以及OMS对应的光纤段/光缆段的信息，而未存储有OMS对应的SRLG的信息。也就是说，该运营商管理设备中存储有OMS的信息与光纤段/光缆段的信息的对应关系。此时，当该路径选择装置向运营商管理设备发送携带某个OMS的信息的消息时，该运营商管理设备可以基于前述消息中携带的OMS的信息查找出与该OMS对应的光纤段/光缆段的信息，例如，光纤编号、光缆编号、光缆段的长度、该光缆段所在沟的编号等信息。
若该路径选择装置为管控系统，则该管控系统可以直接与运营商管理设备进行信令交互以获取每个OMS对应的光纤段/光缆段的信息。然后，该管控系统根据多个OMS的光纤段/光缆段的信息确定出SRLG的属性信息。示例性的，将拥有相同光缆编号的光纤设置为一个SRLG组，并确定该光纤的距离为SRLG距离，确定该SRLG类型为同缆。示例性的，将拥有相同沟的编号的光缆设置为一个SRLG组，并确定该光缆的距离为SRLG距离，确定该SRLG类型为同沟。若该路径选择装置为ASON网络中的某个节点，则是由该节点从管控系统获取每个OMS对应的SRLG的属性信息。
在一种具体的实施方式中，运营商管理设备中存储有包含OMS的信息与光纤段/光缆段的信息的对应关系表。当管控系统向运营商管理设备发送OMS的标识时，该运营商管理设备可以根据该OMS标识查找前述对应关系表，获得与该OMS对应的全部光纤段/光缆段的信息。示例性的，该运营商管理设备中存储的对应关系表可以如下表1所示：
表1
Figure PCTCN2021123958-appb-000001
以路径选择装置为管控系统为例进行介绍。例如，若管控系统向运营商管理设备发送OMS的标识为OMS001，则该运营商管理设备将向该管控系统回复该OMS的标识(即OMS001)、与该OMS对应的光纤的编号(即光纤_101和光纤_102)、前述光纤所属的光缆的编号(即光缆_201和光缆_202)以及前述光缆所属的沟的编号(即沟_301和沟_301)。又例如，若管控系统向运营商管理设备发送OMS的标识为OMS001、OMS002以及OMS003，则该运营商管理设备将向管控系统回复前述表1所示的内容。然后，该管控系统将基于表1所示的光纤段/光缆段的信息确定各个OMS对应的SRLG的属性信息。示例性的，管控系统根据OMS002对应的光纤_103和OMS003对应的光纤_105属于同一条光缆(即光缆_203)，则确定光纤_103与光纤_105位于同一个SRLG中，并确定该SRLG的类型为同缆不同沟。
在另一种可选的实施方式中，可以是该OMS对应的SRLG信息本就存储于运营商管理设备中，路径选择装置仅从运营商管理设备中获取OMS对应的SRLG的属性信息。
如前述图1A所介绍的，运营商管理设备中存储有OMS的信息以及OMS对应的SRLG的信息，也就是说，该运营商管理设备中存储有OMS与SRLG的对应关系。因此，当该路径选择装置向运营商管理设备发送携带某个OMS的信息的消息时，该运营商管理设备可以基于前述消息中携带的OMS的信息查找出与该OMS对应的SRLG，也就是说，该运营商管理设备可以基于OMS的信息查找出承载前述OMS的一个或多个SRLG的信息。应当注意的是，若该路径选择装置为管控系统，则该管控系统可以直接与运营商管理设备进行信令交互以获取每个OMS对应的SRLG的属性信息。若该路径选择装置为ASON网络中的某个节点，则是由该节点从管控系统获取每个OMS对应的SRLG的属性信息，当然，该管控系统中的OMS对应的SRLG的属性信息也是来自于运营商管理设备。
在一种具体的实施方式中，运营商管理设备中存储有包含OMS的信息与SRLG的信息的对应关系表，前述OMS的信息与SRLG的信息通过OMS的标识和SRLG的标识关联。当管控系统向运营商管理设备发送OMS的标识时，该运营商管理设备可以根据该OMS标识查找前述对应关系表，获得与该OMS对应的全部SRLG的信息。例如，该OMS对应3个SRLG，即该OMS由3个SRLG承载，则该运营商管理设备将向管控系统将获得前述3个SRLG中每个SRLG的属性信息。
示例性的，该运营商管理设备中存储的对应关系表可以如下表2所示：
表2
Figure PCTCN2021123958-appb-000002
以路径选择装置为管控系统为例进行介绍。例如，若管控系统向运营商管理设备发送OMS的标识为OMS001，则该运营商管理设备将向该管控系统回复该OMS的标识(即OMS001)、与该OMS对应的两个SRLG的标识(即SRLG111和SRLG112)以及前述2个SRLG的属性信息。其中，前述2个SRLG的属性信息包括：标识为SRLG111的SRLG的属性信息以及标识为SRLG112的SRLG的属性信息。
本实施例中，该SRLG的属性信息指能够反映SRLG的属性的信息。
在一种可选的实施方式中，该SRLG的属性信息包括SRLG距离、SRLG类型等信息。其中，该SRLG距离指在一个共享风险链路组内的光纤段/光缆段的长度，在同一个SRLG中的光纤段/光缆段有着相同或相近的故障风险。一个SRLG中可以包含一条光纤段/光缆段，此时，该SRLG距离为位于该SRLG中的这一条光纤段/光缆段的长度。一个SRLG也可以包含两条或多条光纤段/光缆段，此时，该SRLG距离为位于该SRLG中的两条或多条并排的光纤段/光缆段的长度。一般地，不同SRLG的SRLG距离是不同的。可以理解为，SRLG距离能够反映出光纤段/光缆段的长度。其中，SRLG类型可以反映不同的光纤段/光缆段的是否同缆或者是否同沟。示例性的，SRLG类型包括架空同缆、管道同缆以及管道同沟。不同SRLG类型将引入不同程度的故障风险。也就是说，若两个SRLG的SRLG距离相同，但这两个SRLG的SRLG类型不同，那么，在采用这两个不同的SRLG构成目标路径时，引入的故障风险是不同的。
步骤203、根据SRLG的属性信息选择目标路径。
具体地，该路径选择装置将参考前述OMS拓扑中的各个OMS对应的SRLG的属性信息，从前述多个OMS中选择出至少一个OMS以组成目标路径。其中，该目标路径用于通过前多个OMS中的至少一个OMS将业务数据从所述源节点传输至所述目的节点。
示例性的，若前述OMS拓扑包括M个OMS，其中，M为大于1的整数。那么，该目标路径中包括N个OMS，其中，N为大于或等于1的整数，并且，N小于或等于M。
具体地，该路径选择装置将获取与前述源节点相连的OMS对应的SRLG的属性信息，然后，根据前述OMS对应的SRLG的属性信息从与前述源节点相连的多个OMS中选择一个或多个OMS，并确定通过前述OMS与源节点连接的节点。然后，该路径选择装置再基于选出的与源节点连接的节点，进一步搜寻OMS以及该OMS对应的SRLG，直到搜寻到 目的节点。此时，连接前源节点和目的节点的多个OMS便构成了目标路径。
本实施例中，由于在选择传输业务数据的目标路径时，考虑了OMS对应的SRLG的属性信息，也就是说，考虑了OMS对应的光纤路径的实际情况。该SRLG的属性信息能够反映实际光纤路径的故障风险情况，因此，基于SRLG的属性信息筛选目标路径有利于降低传输路径故障风险，提高业务传输的可靠性。
基于前述实施方式，在一种可选的实施方式中，该路径选择装置可以根据SRLG距离选择目标路径。
该路径选择装置可以根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离。其中，SRLG累计距离为一条候选路径上全部OMS对应的SRLG的SRLG距离累积和。例如，若该候选路径上有3个OMS，每个OMS对应2个SRLG，则该候选路径上的全部OMS对应的SRLG为6个SRLG。此时，该候选路径的SRLG累计和为前述6个SRLG的SRLG距离的累计和。另外，前述候选路径指从源节点到OMS拓扑(即源节点与目的节点之间的OMS拓扑)中的某个节点之间的路径。该候选路径可能并未包括目的节点，此时，该路径选择装置正通过计算候选路径搜寻目的节点。该候选路径也可以包括目的节点，此时，该路径选择装置恰好搜寻到目的节点，并将目的节点作为终结点。
在该实施方式中，路径选择装置将根据SRLG累计距离判断该候选路径是否可以作为目标路径。示例性的，若该SRLG累计距离满足预设的条件，则可以确定该SRLG累计距离对应的候选路径为目标路径。示例性的，当SRLG累计距离小于第一预设值，且，该候选路径包括目的节点，则确定该SRLG累计距离对应的候选路径为目标路径。其中，第一预设值可以由运维人员根据经验计算得出，也可以由路径选择装置根据历史数据计算得出，具体此处不做限定。另外，该第一预设值可以是一个较小的固定值，例如，10km；也可以是一个相对值，例如，该第一预设值为当前计算的多条候选路径中的最小SRLG累计距离。具体此处不做限定。
在一种具体的示例中，如图3所示，节点A为源节点，节点E为目的节点，从源节点到目的节点之间的OMS拓扑包括：连接节点A和节点B的第二OMS，连接节点A和节点C的第一OMS，连接节点B和节点F的第六OMS，连接节点C和节点F的第三OMS，连接节点C和节点E的第四OMS，连接节点F和节点E的第五OMS。
该路径选择装置将从源节点开始搜寻，该路径选择装置先获取与该源节点连接的第一OMS对应的各个SRLG的SRLG距离并计算第一累计和，以及与该源节点连接的第二OMS对应的各个SRLG的SRLG距离，并计算第二累计和。其中，第一累计和指该第一OMS对应的全部SRLG的SRLG距离累计和。例如，该第一OMS包含3个SRLG，每个SRLG的距离为3km，则该第一累计和为9km。类似的，第二累计和指该第二OMS对应的全部SRLG的SRLG距离累计和。然后，该路径选择装置将前述第一累计和与第二累计和比对，若该第一累计和小于该第二累计和，则确定通过该第一OMS与该源节点连接的节点(即节点C)为第一候选节点。然后，该路径选择装置获取与该第一候选节点(即节点C)连接的第三OMS对应的各个SRLG的SRLG距离，并计算第三累计和，以及与该第一候选节 点(即节点C)连接的第四OMS对应的各个SRLG的SRLG距离，并计算第四累计和。然后，该路径选择装置将前述节点A到节点F的SRLG累计和(即第一累计和与第三累计和的和)、节点A到节点E的SRLG累计和(即第一累计和与第四累计和的和)以及节点A到节点B的SRLG累计和(即第二累计和)比较。若节点A到节点B的SRLG累计和是最小的，则该路径选择装置将确定节点B为第二候选节点，并基于节点B搜索OMS。若节点A到节点F的SRLG累计和是最小的，则该路径选择装置将确定节点F为第二候选节点，并基于节点F搜索OMS。
假设，节点A到节点F的SRLG累计和是最小的，且，通过该第四OMS与该第一候选节点连接的节点为该目的节点(即节点E)，则确定通过该第三OMS与该第一候选节点连接的节点(即节点F)为第二候选节点。然后，该路径选择装置将获取与该第二候选节点(即节点F)连接的第五OMS对应的各个SRLG的SRLG距离，并计算第五累计和。若通过该第五OMS与该第二候选节点连接的节点为该目的节点(即节点E)，且，该第五累计和与第三累计和的总和小于该第四累计和，则确定该第一OMS、该第三OMS以及该第五OMS构成的路径为该目标路径。
本实施方式中，第一候选节点和第二候选节点为源节点与目的节点之间的中间节点。应当理解的是，前述实施方式仅仅是在OMS数量较少的OMS拓扑中确定目标路径的实例。在实际应用中，源节点与目的节点之间将存在更多的中间节点，该路径选择装置将确定出更多的候选节点。但是，具体的计算方式与前述方式相似。
本实施例中，由于SRLG距离能够反映光纤段/光缆段的长度，并且，SRLG距离越大，光纤段/光缆段的长度越长，该光纤段/光缆段出现故障的风险越大。因此，根据SRLG距离选择SRLG累计距离更小的路径，不仅有利于控制故障风险，还有利于在出现故障时查找故障点。
在实际应用中，为了避免工作路径出现故障而影响传输业务数据，一般地，需要基于该工作路径选择一条或多条保护路径。当工作路径发生故障时，由保护路径承担业务数据传输的任务。在前述场景下，本申请提出了路径选择方法的另一种实施例，具体如图4所示，在该方法中，路径选择装置将执行如下步骤：
步骤401、确定源节点到目的节点之间的光复用段OMS拓扑。
步骤402、获取每个OMS对应的SRLG的SRLG距离。
本实施例中，步骤401和步骤402与前述步骤201和步骤202类似，具体请参阅前述步骤201和步骤202中的相关介绍，具体此处不再赘述。
步骤403、根据工作路径中各个SRLG的SRLG距离以及OMS拓扑中各个OMS对应的SRLG的SRLG距离确定目标路径。
其中，该工作路径可以是在计算目标路径之前便存在的路径，也可以是路径选择装置采用前述图2对应实施例中的方式计算出的工作路径，具体此处不做限定。
具体地，该路径选择装置需要确定该工作路径上的每个OMS对应的每个SRLG的属性信息，以使得在计算目标路径(即保护路径)时，尽量避免与工作路径中的SRLG重合， 也尽量避免影响工作路径的故障风险。
本实施例中，路径选择装置基于SRLG距离为工作路径选择目标路径的方式有如下几种：
在一种可选的实施方式中，该路径选择装置根据SRLG重合距离选择目标路径。
其中，SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和。例如，若工作路径包含SRLG_a、SRLG_b以及SRLG_c三个SRLG，候选路径包含SRLG_b、SRLG_c、SRLG_d以及SRLG_e，那么，工作路径与候选路径相同的SRLG为SRLG_c和SRLG_d，此时，该SRLG重合距离为SRLG_c的SRLG距离与SRLG_d的SRLG距离的累计和。
具体地，该路径选择装置将根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离。其中，每条该候选路径包括至少一个OMS。然后，该路径选择装置将根据SRLG重合距离判断该候选路径是否可以作为目标路径。示例性的，若该SRLG重合距离满足预设的条件，则可以确定该SRLG重合距离对应的候选路径为目标路径。示例性的，当SRLG重合距离小于第二预设值，且，该候选路径包括目的节点，则确定该SRLG重合距离对应的候选路径为目标路径。其中，第二预设值可以由运维人员根据经验计算得出，也可以由路径选择装置根据历史数据计算得出，具体此处不做限定。另外，该第二预设值可以是一个较小的固定值，例如，2km或0km；也可以是一个相对值，例如，该第二预设值为当前计算的多条候选路径中的最小SRLG重合距离。具体此处不做限定。
为便于理解，下面将结合图5A和图5B的示例进行介绍：
其中，图5A为从源节点(即节点A)到目的节点(即节点B)的OMS拓扑，其中，每两个节点之间的连线表示一个OMS。具体地，该OMS拓扑包括OMS_ab(即节点A与节点B之间的OMS)、OMS_bd(即节点B与节点D之间的OMS)、OMS_ac(即节点A与节点C之间的OMS)、OMS_cd(即节点C与节点D之间的OMS)以及OMS_ad(即节点A与节点D之间的OMS)。也可以理解为，该OMS拓扑也包括每个OMS两端的节点。
图5B为图5A所示的OMS拓扑对应的SRLG拓扑图的一个示例。其中，OMS_ab对应SRLG1、SRLG2和SRLG3；OMS_bd对应SRLG7；OMS_ac对应SRLG1和SRLG4；OMS_cd对应SRLG5；OMS_ad对应SRLG1、SRLG2和SRLG6。
其中，节点A与节点B之间的路径为工作路径A_B。该路径选择装置将获取与源节点(即节点A)连接的OMS对应的每个SRLG的SRLG距离。其中，具体包括：OMS_ab对应的SRLG1、SRLG2和SRLG3的SRLG的距离；OMS_ad对应的SRLG1、SRLG2和SRLG6的SRLG的距离；OMS_ac对应的SRLG1和SRLG4的SRLG的距离。其中，除了OMS_ab为工作路径之外，其他OMS用于确定候选路径。其中，OMS_ab与OMS_ad具有2个共同的SRLG，即SRLG1和SRLG2。OMS_ab与OMS_ac具有1个共同的SRLG，即SRLG1。因此，路径选择装置可以确定候选路径A_C(即经过OMS_ac的候选路径)的SRLG重合距离比候选路径A_D(经过OMS_ad的候选路径)的SRLG重合距离小，并且，节点C和节点D并非目的节点(即节点B)。因此，该路径选择装置将确定节点C为候选节点，然后，该路径选择装置将基于节点C继续搜寻OMS。此时，与节点C连接的OMS_cd对 应的SRLG为SRLG5。由图5B可知，候选路径A_C_D(即经过OMS_ac和OMS_cd的候选路径)与工作路径A_B也仅具有1个共同的SRLG，即SRLG1。因此，候选路径A_C_D的SRLG重合距离小于候选路径A_C的SRLG重合距离，并且，节点C和节点D并非目的节点(即节点B)。因此，该路径选择装置将确定节点D为候选节点，然后，该路径选择装置将基于节点D继续搜寻OMS。此时，与节点D连接的OMS_db对应的SRLG为SRLG7。此时，候选路径A_C_D_B(即经过OMS_ac、OMS_cd和OMS_db的候选路径)与工作路径A_B也仅具有1个共同的SRLG，即SRLG1。因此，候选路径A_C_D_B的SRLG重合距离小于候选路径A_C的SRLG重合距离，并且，OMS_db的另一端为节点B(即目的节点)。因此，该路径选择装置将确定候选路径A_C_D_B为工作路径A_B的保护路径，以使得工作路径A_B出现故障时，由候选路径A_C_D_B代替工作路径A_B传输业务数据。
本实施方式中，由于在选择目标路径时考虑了候选路径与工作路径的相同的SRLG的SRLG距离，并且，尽量选择与工作路径之间具有较少的相同SRLG的候选路径(即选择SRLG重合距离更小的候选路径)。因此，该路径选择装置确定出的目标路径可以尽量避免与工作路径的SRLG重合，有利于降低因工作路径出现故障而影响到保护路径的几率。
在另一种可选的实施方式中，该路径选择装置根据SRLG重合距离和SRLG累计距离选择目标路径。
其中，SRLG重合距离和SRLG累计距离的介绍可以参阅前文的描述，具体此处不再赘述。
示例性的，若候选路径的SRLG重合距离和SRLG累计距离均满足预设的条件，则可以确定该SRLG重合距离和SRLG累计距离对应的候选路径为目标路径。例如，若该SRLG重合距离小于该第二预设值，且，该SRLG累计距离小于第三预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。其中，第三预设值可以由运维人员根据经验计算得出，也可以由路径选择装置根据历史数据计算得出，具体此处不做限定。另外，该第三预设值可以是一个较小的固定值，例如，10km；也可以是一个相对值，例如，该第三预设值为当前计算的多条候选路径中的最小SRLG累计距离。具体此处不做限定。
示例性的，该路径选择装置也可以先考虑SRLG重合距离再考虑SRLG累计距离，例如，优先选择SRLG重合距离较小的候选路径，若存在多条候选路径的SRLG重合距离相同或相近，可以再考虑前述多条候选路径(即SRLG重合距离相同或相近的候选路径)的SRLG累计距离。然后，从SRLG重合距离相同或相近的多条候选路径中选择SRLG累计距离较小的候选路径作为目标路径。
示例性的，该路径选择装置也可以先考虑SRLG累计距离再考虑SRLG重合距离，例如，优先选择SRLG累计距离较小的候选路径，若存在多条候选路径的SRLG累计距离相同或相近，可以再考虑前述多条候选路径(即SRLG累计距离相同或相近的候选路径)的SRLG重合距离。然后，从SRLG累计距离相同或相近的多条候选路径中选择SRLG重合距离较小的候选路径作为目标路径。
为便于理解，下面将结合图5A和图5C的示例进行介绍：
图5C为图5A所示的OMS拓扑对应的SRLG拓扑图的另一个示例。其中，OMS_ab’对应SRLG1和SRLG2；OMS_bd’对应SRLG6；OMS_ac’对应SRLG1和SRLG3；OMS_cd’对应SRLG4；OMS_ad’对应SRLG1和SRLG5。
其中，节点A与节点B之间的路径为工作路径A_B’。该路径选择装置将获取与源节点(即节点A)连接的OMS对应的每个SRLG的SRLG距离。其中，具体包括：OMS_ab’对应的SRLG1和SRLG2的SRLG的距离；OMS_ad’对应的SRLG1和SRLG5的SRLG的距离；OMS_ac’对应的SRLG1和SRLG3的SRLG的距离。
以路径选择装置先考虑SRLG重合距离再考虑SRLG累计距离为例。
其中，OMS_ab’与OMS_ad’具有1个共同的SRLG，即SRLG1。OMS_ab’与OMS_ac’具有1个共同的SRLG，即SRLG1。因此，路径选择装置需要从前述SRLG累计距离相同的候选路径中选择SRLG重合距离较小的候选路径作为保护路径。因此，路径选择装置将分别基于节点C和节点D继续搜寻OMS。
假设，若前述图5C中每个SRLG对应的SRLG距离如下表3所示：
表3
SRLG标识 SRLG距离
SRLG1 2km
SRLG2 2km
SRLG3 1km
SRLG4 5km
SRLG5 1km
SRLG6 1km
此时，与节点C连接的OMS_cd’对应的SRLG为SRLG4。候选路径A_C_D’(即经过OMS_ac’和OMS_cd’的候选路径)的SRLG累计距离等于SRLG1的距离、SRLG3的距离和SRLG4的距离的累计和，即2+1+5＝8km。与节点D连接的OMS_db’对应的SRLG为SRLG6。候选路径A_D_B’(即经过OMS_ad’和OMS_db’的候选路径)的SRLG累计距离等于SRLG1的距离、SRLG5的距离和SRLG6的距离的累计和，即2+1+1＝4km。由于，候选路径A_D_B’的SRLG累计距离小于候选路径A_C_D’的累计距离，并且，候选路径A_D_B’包括目的节点(即节点B)。因此，路径选择装置确定候选路径A_D_B’为工作路径A_B’的保护路径，以使得工作路径A_B’出现故障时，由候选路径A_D_B’代替工作路径A_B’传输业务数据。
本实施方式中，由于在选择目标路径时不仅考虑了SRLG重合距离还考虑了SRLG累计距离，有利于降低因工作路径出现故障而影响到保护路径的几率。
在实际应用中，路径选择装置可以引入风险值，以使得量化前述计算过程。
在一种可选的实施方式中，风险值＝SRLG累计距离+SRLG重合距离×SRLG重合风险系数。其中，风险值越大代表该路径出现故障风险的几率越大。若该路径为某条工作路径的保护路径，那么，该风险值也可以反映该工作路径出现故障时对该保护路径的影响程度。 例如，风险值越大，代表工作路径出现故障时对该保护路径的影响程度越大。此外，SRLG重合风险系数用于指示SRLG重合距离对候选路径的故障风险的影响程度。
示例性的，若路径选择装置在确定目标路径时优先考虑SRLG重合距离，也可以理解为，SRLG重合距离比SRLG累计距离对路径的故障风险影响更大，则该SRLG重合风险系数可以设置为较大值。例如，SRLG重合风险系数的数量级大于SRLG累计距离的数量级。
示例性的，若路径选择装置在确定目标路径时优先考虑SRLG累计距离，也可以理解为，SRLG重合距离比SRLG累计距离对路径的故障风险影响更小，则该SRLG重合风险系数可以设置为较小值。例如，SRLG重合风险系数的数量级小于SRLG累计距离的数量级。
依然以前述图5B为例，前述图5B中每个SRLG对应的SRLG距离如下表4所示：
表4
SRLG标识 SRLG距离
SRLG1 2km
SRLG2 8km
SRLG3 1km
SRLG4 1km
SRLG5 5km
SRLG6 1km
SRLG7 6km
其中，风险值＝SRLG累计距离+SRLG重合距离×M。其中，M为SRLG重合风险系数。示例性的，由于每个SRLG的SRLG距离的数量级为10，因此，M可以取100或1000等。
该路径选择装置的具体计算过程如下：
1)从节点A出发，依次搜索到{B，C，D}，并记录每条候选路径的风险值为{B(A_B):11+11M，C(A_C):3+2M，D(A_D):11+10M}。
2)选择风险值最小的候选路径对应的节点，即节点C(A_C)。继续向外搜索，得到节点D。计算候选路径A_C_D的风险值为8+2M，得到每条候选路径的风险值为{B(A_B):11+11M，D(A_D):11+10M，D(A_C_D):8+2M}。
3)选择风险值最小的候选路径对应的节点，即节点D(A_C_D)。继续向外搜索，得到节点B。计算候选路径A_C_D_B的风险值为14+2M，得到每条候选路径的风险值为{B(A_B):11+11M，D(A_D):11+10M，B(A_C_D_B):14+2M}。
4)由于，风险值最小的候选路径为候选路径A_C_D_B，并且，候选路径A_C_D_B包含目的节点(即节点B)。因此，路径选择装置确定目标路径为候选路径A_C_D_B。
又例如，以前述图5C为例，前述图5C中每个SRLG对应的SRLG距离如前述表2所示。
其中，风险值＝SRLG累计距离+SRLG重合距离×M。其中，M为SRLG重合风险系数。示例性的，由于每个SRLG的SRLG距离的数量级为10，因此，M可以取100或1000等。
1)从节点A出发，依次搜索到{B，C，D}，并记录每条候选路径的风险值为{B(A_B):4+4M，C(A_C):3+2M，D(A_D):3+2M}。
2)选择风险值最小的候选路径对应的节点，即节点C(A_C)。继续向外搜索，得到节点D。计算候选路径A_C_D的风险值为8+2M，得到每条候选路径的风险值为{B(A_B):4+4M，D(A_D):3+2M，D(A_C_D):8+2M}。
3)选择风险值最小的候选路径对应的节点，即节点D(A_D)。继续向外搜索，得到节点B。计算候选路径A_D_B的风险值为9+2M，得到每条候选路径的风险值为{B(A_B):4+4M，D(A_C_D):8+2M，B(A_D_B):9+2M}。
4)选择风险值最小的候选路径对应的节点，即节点D(A_C_D)。继续向外搜索，得到B。计算候选路径A_D_B的风险值为14+2M，得到每条候选路径的风险值为{B(A_B):4+4M，B(A_D_B):9+2M，D(A_C_D_B):14+2M}。
5)选择风险值最小的候选路径对应的节点，即节点B(A_D_B)，出堆，B点已经是目的节点，得到最小风险路径A_D_B。
由于，风险值最小的候选路径为候选路径A_C_D_B，并且，候选路径A_C_D_B包含目的节点(即节点B)。因此，路径选择装置确定目标路径为候选路径A_C_D_B。
如图6所示，为本申请提出的路径选择方法的另一种实施例，在该方法中，路径选择装置不仅需要考虑SRLG距离，还需要考虑SRLG类型等SRLG属性。具体地，该路径选择装置将执行如下步骤：
步骤601、确定源节点到目的节点之间的光复用段OMS拓扑。
步骤602、获取每个OMS对应的SRLG的SRLG距离和SRLG类型。
本实施例中，步骤601和步骤602与前述步骤201和步骤202类似，具体请参阅前述步骤201和步骤202中的相关介绍，具体此处不再赘述。
步骤603、根据工作路径和候选路径中各个SRLG的SRLG距离和SRLG类型确定目标路径。
其中，该工作路径可以是在计算目标路径之前便存在的路径，也可以是路径选择装置采用前述图2对应实施例中的方式计算出的工作路径，具体此处不做限定。具体地，请参阅前述步骤403中的相关介绍，此处不再赘述。
其中，SRLG类型包括架空同缆、管道同缆以及管道同沟。不同SRLG类型将引入不同程度的故障风险。也就是说，若两个SRLG的SRLG距离相同，但这两个SRLG的SRLG类型不同，那么，在采用这两个不同的SRLG构成目标路径时，引入的故障风险是不同的。一般地，架空同缆的故障风险大于管道同缆的故障风险，管道同缆的故障风险大于管道同沟的故障风险，当然，架空同缆的故障风险大于管道同沟的故障风险。
为了将SRLG距离和SRLG类型均作为选择目标路径的参考因素，本实施方式引入了 风险值，该风险值是对SRLG距离和SRLG类型的量化符号。该风险值可以由SRLG距离、该SRLG类型、该SRLG类型的风险系数以及SRLG重合风险系数确定。其中，SRLG类型的风险系数用于指示该种SRLG类型可能引入的故障风险的程度。一般地，架空同缆的SRLG类型的风险系数大于管道同缆的SRLG类型的风险系数，管道同缆的SRLG类型的风险系数大于管道同沟SRLG类型的风险系数，具体此处不做限定。另外，该SRLG重合风险系数用于指示SRLG重合距离对候选路径的故障风险的影响程度。具体地，请参阅前文关于SRLG重合风险系数的介绍此处不再赘述。
具体地，该路径选择装置可以先确定每种SRLG类型的风险系数以及SRLG重合风险系数。然后，该路径选择装置根据该SRLG距离、该SRLG类型、该SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值。其中，该风险值等于SRLG累计距离、第一距离以及第二距离的总和，第一距离为该SRLG重合距离与重合风险系数的乘积，该第二距离为每个SRLG的SRLG距离与该SRLG的SRLG类型的风险系数的加权总和。
示例性的，可以采用如下公式确定风险值：
Figure PCTCN2021123958-appb-000003
当该风险值越大时，则该候选路径的故障风险越大，应尽量避免选择；当该风险值越小时，则该候选路径的故障风险越小，可以考虑选择。本实施例中，若该风险值小于第四预设值，且，该候选路径包括该目的节点，则确定该风险值对应的候选路径为该目标路径。
应当注意的是，重合风险系数与SRLG类型的风险系数之间可以没有明确的大小限定。也就是说，重合风险系数可以大于某种SRLG类型的风险系数，表示工作路径和保护路径存在重合SRLG时引入的风险比该种SRLG类型引入的风险更大；重合风险系数也可以小于某种SRLG类型的风险系数，表示工作路径和保护路径存在重合SRLG时引入的风险比该种SRLG类型引入的风险更小。在实际应用中可以根据传输业务的需求调整前述SRLG重合风险系数和SRLG类型的风险系数，具体本实施例不做限定。
依然以前述图5B为例，前述图5B中每个SRLG对应的SRLG距离、SRLG类型等信息如下表5所示：
表5
SRLG标识 SRLG距离 SRLG类型 SRLG类型的风险系数
SRLG1 8km 管道同缆 N 1
SRLG2 2km 架空同缆 N 2
SRLG3 1km 管道同缆 N 1
SRLG4 1km 管道同缆 N 1
SRLG5 6km 管道同缆 N 1
SRLG6 1km 管道同缆 N 1
SRLG7 1km 管道同缆 N 1
在本示例中，前述风险值采用如下公式表示：
Figure PCTCN2021123958-appb-000004
Figure PCTCN2021123958-appb-000005
以N 2远大于N 1，且，N 1远大于M为例，也可以理解为，N 2的数量级大于N 1的数量级，N 1的数量级大于M的数量级。例如，N 2＝10000，N 1＝1000，M＝100。
(1)从节点A出发，先依次搜索到{B，C，D}，并记录每条候选路径的风险值为{B(A_B):11+11M+9N 1+2N 2，C(A_C):9+8M+9N 1，D(A_D):11+8M+9N 1+2N 2}。
(2)选择风险值最小的候选路径对应的节点，即节点C(A_C)。继续向外搜索，得到节点D。计算候选路径A_C_D的风险值为15+8M+15N 1，得到每条候选路径的风险值为{B(A_B):11+11M+9N 1+2N 2，C(A_C_D):15+8M+15N 1，D(A_D):11+8M+9N 1+2N 2}。
(3)选择风险值最小的候选路径对应的节点，即节点B(A-C-D)。继续向外搜索，得到节点B。计算候选路径A_C_D_B的风险值为计算当前风险16+8M+16N 1，得到每条候选路径的风险值为{B(A_B):11+11M+9N 1+2N 2，C(A_C_D_B):16+8M+16N 1，B(A_D):11+8M+9N 1+2N 2}。
(4)由于，风险值最小的候选路径为候选路径A_C_D_B，并且，候选路径A_C_D_B包含目的节点(即节点B)。因此，路径选择装置确定目标路径为候选路径A_C_D_B。
本实施方式中，由于路径选择装置在选择目标路径时考虑了SRLG距离、SRLG类型等SRLG的属性信息。也就是说，考虑了承载OMS的光纤路径的实际情况。该SRLG的属性信息能够反映实际光纤路径的故障风险情况，因此，基于SRLG的属性信息筛选目标路径有利于降低传输路径故障风险，提高业务传输的可靠性。相比于传统技术中，仅考虑源节点与目的节点之间的OMS的个数的方案和仅考虑源节点与目的节点之间的SRLG的个数的方案，本申请的方案将参考各个SRLG的属性信息，由于不同SRLG的某一项属性的取值是不同的，因此，基于SRLG的属性信息确定目标路径能够真实客观地反映SRLG的情况(即物理链路的情况)，进而能够较为准确地避开故障风险。因此，相比于传统技术的方案有利于降低传输路径的故障风险。
此外，如图7所示，本申请实施例还提供了一种路径选择装置70，图7为该路径选择装置70的结构示意图。该路径选择装置70可以用于执行以上图2、图4以及图6对应实施例中的方法。
如图7所示，路径选择装置70可以包括处理器710、存储器720和收发器730。其中，该处理器710与该存储器720耦合连接，该处理器710与该收发器730耦合连接。
其中，前述收发器730也可以称为收发单元、收发机、收发装置等。可选的，可以将收发单元中用于实现接收功能的器件视为接收单元，将收发单元中用于实现发送功能的器件视为发送单元，即收发单元包括接收单元和发送单元，接收单元也可以称为接收机、输入口、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。示例性的，该收发器730可以是光模块。
其中，前述处理器710可以是中央处理器(central processing unit，CPU)，网络处理器(network processor，NP)或者CPU和NP的组合。处理器还可以是专用集成电路(application-specific integrated circuit，ASIC)，可编程逻辑器件(programmable logic device，PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device， CPLD)，现场可编程逻辑门阵列(field-programmable gate array，FPGA)，通用阵列逻辑(generic array logic，GAL)或其任意组合。处理器710可以是指一个处理器，也可以包括多个处理器。
此外，前述该存储器720主要用于存储软件程序和数据。存储器720可以是独立存在，与处理器710相连。可选的，该存储器720可以和该处理器710集成于一体，例如集成于一个或多个芯片之内。其中，该存储器720能够存储执行本申请实施例的技术方案的程序代码，并由处理器710来控制执行，被执行的各类计算机程序代码也可被视为是处理器710的驱动程序。存储器720可以包括易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)；存储器也可以包括非易失性存储器(non-volatile memory)，例如只读存储器(read-only memory，ROM)，快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)；存储器720还可以包括上述种类的存储器的组合。存储器720可以是指一个存储器，也可以包括多个存储器。
在一个实现方式中，存储器720中存储有计算机可读指令，所述计算机可读指令包括多个软件模块，例如发送模块721，处理模块722和接收模块723。处理器710执行各个软件模块后可以按照各个软件模块的指示进行相应的操作。在本实施例中，一个软件模块所执行的操作实际上是指处理器710根据所述软件模块的指示而执行的操作。
示例性的，该处理模块722用于根据所述SRLG的属性信息选择目标路径，所述目标路径用于通过所述多个OMS中的至少一个OMS将业务数据从所述源节点传输至所述目的节点。
示例性的，该处理模块722还用于根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离；以及，当所述SRLG累计距离小于第一预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG累计距离对应的候选路径为所述目标路径。
示例性的，当前述路径选择装置70由管控系统实现时，前述发送模块721用于向运营商管理设备发送请求消息，该请求消息用于获取一个或者多个OMS对应的SRLG的属性信息。前述接收模块723用于从运营商管理设备接收一个或者多个OMS对应的SRLG的属性信息。
示例性的，当前述路径选择装置70由OMS网络中的一个节点实现时，前述发送模块721用于向管控系统发送请求消息，该请求消息用于获取从源节点到目的节点之间的OMS对应的SRLG的属性信息。前述接收模块723用于从管控系统接收一个或者多个OMS对应的SRLG的属性信息。
其余可以参考图2、图4以及图6对应实施例中路径选择装置的方法，此处不再赘述。
如图8所示，为本申请实施例提供了一种路径选择装置80的结构示意图。前述图2、图4和图6对应的方法实施例均可以基于图8所示的路径选择装置80的结构。
该路径选择装置80包括多个功能模块，前述各个功能模块可以集成在一个处理单元中，也可以是各个模块单独物理存在，也可以两个或两个以上模块集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
具体地，该路径选择装置80可以是管理ASON网络的管控系统或该管控系统中的功能模块；该路径选择装置80也可以是位于某个计算节点中的功能模块。具体地，该路径选择装置80包括确定模块801、获取模块802、选择模块803。
其中，确定模块801，用于确定源节点到目的节点之间的光复用段OMS拓扑，该OMS拓扑包括多个OMS；获取模块802，用于获取每个该OMS对应的共享风险链路组SRLG的属性信息；选择模块803，用于根据该SRLG的属性信息选择目标路径，该目标路径用于通过该多个OMS中的至少一个OMS将业务数据从该源节点传输至该目的节点。
在另一种可选的实施方式中，该选择模块803，具体用于：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离，该SRLG累计距离为一条该候选路径上全部OMS对应的SRLG的SRLG距离累积和；当该SRLG累计距离小于第一预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，该选择模块803，具体用于：根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离，每条该候选路径包括至少一个OMS，该SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和，该工作路径用于将业务数据从该源节点通过至少一个该OMS传输至该目的节点；若该SRLG重合距离小于第二预设值，且，该候选路径包括该目的节点，则确定该SRLG重合距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，该选择模块803，还用于：根据该SRLG距离计算该候选路径的SRLG累计距离，该SRLG累计距离为该候选路径上全部OMS对应的SRLG的SRLG距离累积和；若该SRLG重合距离小于该第二预设值，且，该SRLG累计距离小于第三预设值，且，该候选路径包括该目的节点，则确定该SRLG累计距离对应的候选路径为该目标路径。
在另一种可选的实施方式中，该属性信息还包括SRLG类型；该选择模块803，具体用于：确定每种该SRLG类型的风险系数以及SRLG重合风险系数；根据该SRLG距离、该SRLG类型、该SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值，该SRLG重合风险系数用于指示该候选路径与工作路径重合时的风险程度；若该风险值小于第四预设值，且，该候选路径包括该目的节点，则确定该风险值对应的候选路径为该目标路径。
其余可以参考图2、图4以及图6对应实施例中路径选择装置的方法，此处不再赘述。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。还应理解，本文中涉及的第一、第二、第三、第四以及各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围。
应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (17)

  1. 一种路径选择方法，其特征在于，包括：
    确定源节点到目的节点之间的光复用段OMS拓扑，所述OMS拓扑包括多个OMS；
    获取每个所述OMS对应的共享风险链路组SRLG的属性信息；
    根据所述SRLG的属性信息选择目标路径，所述目标路径用于通过所述多个OMS中的至少一个OMS将业务数据从所述源节点传输至所述目的节点。
  2. 根据权利要求1所述的方法，其特征在于，所述属性信息包括SRLG距离。
  3. 根据权利要求2所述的方法，其特征在于，每个所述OMS对应一个或多个SRLG；
    所述根据所述SRLG的属性信息选择目标路径，包括：
    根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离，所述SRLG累计距离为一条所述候选路径上全部OMS对应的SRLG的SRLG距离累积和；
    当所述SRLG累计距离小于第一预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG累计距离对应的候选路径为所述目标路径。
  4. 根据权利要求2所述的方法，其特征在于，每个所述OMS对应一个或多个SRLG；
    所述根据所述SRLG的属性信息选择目标路径，包括：
    根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离，每条所述候选路径包括至少一个OMS，所述SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和，所述工作路径用于将业务数据从所述源节点通过至少一个所述OMS传输至所述目的节点；
    若所述SRLG重合距离小于第二预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG重合距离对应的候选路径为所述目标路径。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    根据所述SRLG距离计算所述候选路径的SRLG累计距离，所述SRLG累计距离为所述候选路径上全部OMS对应的SRLG的SRLG距离累积和；
    若所述SRLG重合距离小于所述第二预设值，且，所述SRLG累计距离小于第三预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG累计距离对应的候选路径为所述目标路径。
  6. 根据权利要求2至5中任意一项所述的方法，其特征在于，所述属性信息还包括SRLG类型；
    所述根据所述SRLG的属性信息选择目标路径，包括：
    确定每种所述SRLG类型的风险系数以及SRLG重合风险系数；
    根据所述SRLG距离、所述SRLG类型、所述SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值，所述SRLG重合风险系数用于指示所述候选路径与工作路径重合时的风险程度；
    若所述风险值小于第四预设值，且，所述候选路径包括所述目的节点，则确定所述风险值对应的候选路径为所述目标路径。
  7. 根据权利要求6所述的方法，其特征在于，所述SRLG类型包括架空同缆、管道同 缆以及管道同沟。
  8. 一种路径选择装置，其特征在于，包括：
    确定模块，用于确定源节点到目的节点之间的光复用段OMS拓扑，所述OMS拓扑包括多个OMS；
    获取模块，用于获取每个所述OMS对应的共享风险链路组SRLG的属性信息；
    选择模块，用于根据所述SRLG的属性信息选择目标路径，所述目标路径用于通过所述多个OMS中的至少一个OMS将业务数据从所述源节点传输至所述目的节点。
  9. 根据权利要求8所述的路径选择装置，其特征在于，所述属性信息包括SRLG距离。
  10. 根据权利要求9所述的路径选择装置，其特征在于，每个所述OMS对应一个或多个SRLG；
    所述选择模块，具体用于：
    根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG累计距离，所述SRLG累计距离为一条所述候选路径上全部OMS对应的SRLG的SRLG距离累积和；
    当所述SRLG累计距离小于第一预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG累计距离对应的候选路径为所述目标路径。
  11. 根据权利要求9所述的路径选择装置，其特征在于，每个所述OMS对应一个或多个SRLG；
    所述选择模块，具体用于：
    根据多个OMS对应的SRLG距离计算至少一条候选路径的SRLG重合距离，每条所述候选路径包括至少一个OMS，所述SRLG重合距离为一条候选路径与一条工作路径之间相同SRLG的SRLG距离累积和，所述工作路径用于将业务数据从所述源节点通过至少一个所述OMS传输至所述目的节点；
    若所述SRLG重合距离小于第二预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG重合距离对应的候选路径为所述目标路径。
  12. 根据权利要求11所述的路径选择装置，其特征在于，所述选择模块，还用于：
    根据所述SRLG距离计算所述候选路径的SRLG累计距离，所述SRLG累计距离为所述候选路径上全部OMS对应的SRLG的SRLG距离累积和；
    若所述SRLG重合距离小于所述第二预设值，且，所述SRLG累计距离小于第三预设值，且，所述候选路径包括所述目的节点，则确定所述SRLG累计距离对应的候选路径为所述目标路径。
  13. 根据权利要求9至12中任意一项所述的路径选择装置，其特征在于，所述属性信息还包括SRLG类型；
    所述选择模块，具体用于：
    确定每种所述SRLG类型的风险系数以及SRLG重合风险系数；
    根据所述SRLG距离、所述SRLG类型、所述SRLG类型的风险系数以及SRLG重合风险系数确定至少一条候选路径的风险值，所述SRLG重合风险系数用于指示所述候选路径与工作路径重合时的风险程度；
    若所述风险值小于第四预设值，且，所述候选路径包括所述目的节点，则确定所述风险值对应的候选路径为所述目标路径。
  14. 根据权利要求13所述的路径选择装置，其特征在于，所述SRLG类型包括架空同缆、管道同缆以及管道同沟。
  15. 一种路径选择装置，其特征在于，包括处理器，所述处理器和存储器耦合，所述存储器存储有程序，当所述存储器存储的程序指令被所述处理器执行时使得所述路径选择装置实现权利要求1至7中任意一项所述的方法。
  16. 一种计算机可读存储介质，包括计算机程序，所述计算机序被处理器执行以实现如权利要求1至7中任意一项所述的方法。
  17. 一种包含指令的计算机程序产品，所述计算机程序产品包括计算机程序代码，当所述计算机程序代码在计算机上运行时，使得计算机执行如权利要求1至7中任意一项所述的方法。
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