CN111683008A - SDN-based transmission network service path scheduling and protecting method and system - Google Patents
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Abstract
The invention discloses a method and a system for scheduling and protecting a service path of a transmission network based on an SDN (software defined network). an SDN controller acquires topology information and state information of the transmission network, calculates the topology information to form a topology database, and determines the cost of each section of link; acquiring the original address, the destination address and the bandwidth demand information of the transmission network service; the SDN controller calculates each available path according to the original address and the destination address; and the SDN controller evaluates each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, bandwidth demand information and each available path, and determines an optimal path for carrying the service. The advantages are that: bandwidth evaluation indexes are increased, an optimal path is selected as a link allocation basis, and idle bandwidth redundancy is reduced; when node failure or link failure occurs, the path can be updated to a new backup path in time, and the path switching time is reduced.
Description
Technical Field
The invention relates to a SDN-based transmission network service path scheduling and protecting method and system, and belongs to the technical field of transmission networks.
Background
The transmission network is a network used as a transmission channel of a communication carrier, and is generally configured under a switching network, a data network and a support network to provide a network for signal transmission and conversion.
The transmission network traffic path has a fixed bandwidth and a high requirement on transmission quality. The establishment, update and deletion of the service need to be controlled manually.
Traditional transmission networks such as SDH, IPRAN, PTN require computation of the allocation of active/standby paths. When the main path fails, the protection switching is started to switch the service to the standby link. However, when the active link and the standby link fail at the same time, the service fails (even if there is a path that can be forwarded, the service still fails).
Traditional transport networks like SDH, IPRAN, PTN require allocation of active and standby paths and reservation of bandwidth. Therefore, the bandwidth utilization of the conventional transmission network is below 50% (although the ip ran and the PTN can provide redundancy for protecting the bandwidth, they still cannot provide high bandwidth utilization for ensuring the network transmission quality). If multiple protections are established, greater bandwidth redundancy needs to be provided, thereby reducing network bandwidth utilization.
In a transmission network networking, when node failure and link failure occur, protection packet exchange needs to be carried out immediately, and a service is updated to a new service path. The protection switching time is generally required to be within 50 ms.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a transmission network service path scheduling and protecting method and system based on SDN.
In order to solve the above technical problems, the present invention provides a transmission network service path scheduling method based on SDN,
the SDN controller acquires transmission network topology information and state information, calculates the topology information to form a topology database, and determines the cost of each link section; calculating the current residual bandwidth of each link section according to the state information;
acquiring original address, destination address and bandwidth demand information of transmission network service;
the SDN controller calculates each available path according to the original address and the destination address;
and the SDN controller evaluates each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, the bandwidth demand information and each available path, and determines an optimal path for carrying the service.
Further, if the transmission network service is cancelled, deleting the corresponding transmission network service path and releasing the bandwidth resource.
Further, the SDN controller evaluates each path by using an optimal bandwidth allocation method according to the overhead of each path and the minimum residual bandwidth of the link, and the determined overhead of each link and the determined residual bandwidth of each link, and the process of determining an optimal path for carrying out service is as follows:
selecting a path with the least expense from j paths for the service i according to the determined expense of each section of link and the remaining bandwidth of each section of link, calculating the minimum remaining bandwidth of the path, and comparing the minimum remaining bandwidth with bandwidth requirement information;
if the requirement of the bandwidth demand information is met, determining the path as an optimal path and carrying out service bearing;
if the cost does not meet the requirement of the bandwidth requirement information, sequentially selecting paths from low to high and comparing the paths with the bandwidth requirement information until an optimal path is determined;
and if all paths do not meet the requirement of the bandwidth requirement information, prompting that the service delivery fails.
A SDN-based transmission network service path protection method,
when a link or a node in a path fails, setting the path containing the failed node or the failed link to be in a blocking state, and reselecting an optimal path for service bearing by using the scheduling method of any one of claims 1 to 3;
the SDN controller is periodically updated, and if a fault node or a fault link of an original path is detected to be recovered, the service path is switched back to the original path; and if the failure node or the failure link of the original path is not recovered, deleting the original path.
An SDN-based transport network service path scheduling system, comprising:
the first acquisition module is used for acquiring transmission network topology information and state information through an SDN controller, calculating the topology information to form a topology database, and determining the overhead of each link section; calculating the current residual bandwidth of each link section according to the state information;
the second acquisition module is used for acquiring the original address, the destination address and the bandwidth demand information of the transmission network service;
a calculation module, configured to calculate, by the SDN controller, each available path according to the original address and the destination address;
and the determining module is used for evaluating each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, the bandwidth demand information and each available path through the SDN controller, and determining an optimal path for carrying the service.
Further, the method also comprises the following steps:
and the deleting module is used for deleting the corresponding transmission network service path and releasing the bandwidth resource when the transmission network service cancels the affairs.
Further, the determining module further comprises:
the comparison module is used for selecting a path with the least expense from j paths for the service i according to the determined expense of each section of link and the residual bandwidth of each section of link, calculating the minimum residual bandwidth of the path and comparing the minimum residual bandwidth with the bandwidth requirement information;
if the requirement of the bandwidth demand information is met, determining the path as an optimal path and carrying out service bearing;
if the cost does not meet the requirement of the bandwidth requirement information, sequentially selecting paths from low to high and comparing the paths with the bandwidth requirement information until an optimal path is determined;
and if all paths do not meet the requirement of the bandwidth requirement information, prompting that the service delivery fails.
An SDN-based transport network traffic path protection system, comprising:
a scheduling module, configured to set a path including a failed node or a failed link to a blocking state when a link or a node in the path fails, and reselect an optimal path for service bearer by using the scheduling system of any one of claims 5 to 7;
the updating module is used for periodically updating through the SDN controller, and switching the service path back to the original path if the fault node or the fault link of the original path is detected to be recovered; and if the failure node or the failure link of the original path is not recovered, deleting the original path.
The invention achieves the following beneficial effects:
1. the invention provides a service path optimization method, which increases bandwidth evaluation indexes when selecting paths, selects an optimal path as a link allocation basis and reduces idle bandwidth redundancy.
2. The invention provides a protection switching method, which can be updated to a new backup path in time when a node fault or a link fault occurs. The path switching time is reduced.
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FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a flow chart of protection switching of the method of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The SDN (software defined network) is a novel network innovation architecture provided by the clean slate research group of Stanford university in America, and the core idea is that application software is expected to participate in control management of the network, so that the requirement of upper-layer services is met, and the operation and maintenance of the network are simplified through automatic service deployment.
As shown in fig. 1 and 2, a method for scheduling and protecting a service path of a transport network based on an SDN includes the following steps:
1) and in the initialization stage, the SDN controller acquires the transmission network topology information and the state information, and calculates the topology information to form a topology database. Counting the node of the current nodew＝{node1，node2，node3,…,nodew}. Counting each section of link information, and counting as segment _ stateabv＝{(segmentab1，costab1，free_bwab1)，(segmentab2，costab2，free_bwab2),…,(segmentabv，costabv，free_bwabv) }; wherein segmentabvIs a nodeaTo the nodebThe vth link of (1); wherein costabvIs a nodeaTo the nodebThe cost of the vth link of (1) is calculated as costabv1000 MbPS/link bandwidth; wherein free _ bwabvIs a nodeaTo the nodebThe current remaining bandwidth size of the vth link.
2) The transmission network service is opened and comprises the original address, the destination address and the bandwidth requirement information bw of the servicei。
3) The SDN controller calculates all j available paths of the transmission network service i according to the original address and the destination address, and the paths are recorded as pathsij＝{pathi1，pathi2，pathi3，…pathin，…pathijN is more than or equal to 1 and less than or equal to j; each pathin＝(nodem，path_cost，path_min_free_bw，state)，nodemComprises the following steps: a set of nodes comprised by the nth path of service i. The path _ cost is: the sum of costs included in the nth path of the service i, path _ min _ free _ bw, is: the minimum value of all residual bandwidths contained by the nth path of the service i; wherein the state is a current link state (an activestate activated state, a backup state, a block state locked state, and is initially set to a backup state).
4) SDN controller according to pathijThe path _ cost and the path _ min _ free _ bw in the path _ cost and the path _ min _ free _ bw adopt an optimal bandwidth allocation method to carry out the processing on each pathAnd (3) performing evaluation, namely determining an optimal path for carrying out service bearing:
4.1) selecting the path with the optimal path residual bandwidth from the shortest paths of the j paths of the service i as a transmission path. Bandwidth requirement information bw according to serviceiFirst, select the cost minimum path to search best _ pathi，best_pathiMin { path _ min _ free _ bw } and path _ min _ free _ bw>bwiI.e. the link with the least amount of redundancy.
4.2) path of the service path at the same timeinSet to active state, update segment _ stateabvFree _ bw ofabvAnd (4) resource information.
4.3) if there is no satisfactory best _ path, adding cost and repeating the step 4.1 to select the optimal path for the service.
4.4) if all paths do not have the best _ path meeting the requirement, prompting that the service delivery fails.
5) When a link or node fails, at pathinSetting the state containing the failed node or the failed link path as a Blocking state (Blocking state), returning to step 4, selecting an optimal path in the representation of the backup state (backup state) for service bearing, and simultaneously starting to update the segment _ stateabvFree _ bw ofabvAnd (4) resource information. To achieve fast protection switching.
6) When the failed node or the failed link recovers, the path is startedijIn the process, the current link is restored to a backup state (backup state), and the path entry of the Blocking state is reset to an active state. And switching the service path back to the original path.
7) The SDN controller is periodically updated, and if a failed node or a link is found not to be recovered in three periods, the SDN controller is updated in a pathijWherein the path entry of the Blocking state is deleted and the segment _ state is updatedabvOf (2).
8) Canceling service, canceling service at application side, triggering update pathijAnd segment _ stateabvAnd deleting the corresponding entry and releasing the resource.
Correspondingly, the invention also provides a SDN-based transmission network service path scheduling system, which comprises:
the first acquisition module is used for acquiring transmission network topology information and state information through an SDN controller, calculating the topology information to form a topology database, and determining the overhead of each link section; calculating the current residual bandwidth of each link section according to the state information;
the second acquisition module is used for acquiring the original address, the destination address and the bandwidth demand information of the transmission network service;
a calculation module, configured to calculate, by the SDN controller, each available path according to the original address and the destination address;
and the determining module is used for evaluating each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, the bandwidth demand information and each available path through the SDN controller, and determining an optimal path for carrying the service.
Further, the method also comprises the following steps:
and the deleting module is used for deleting the corresponding transmission network service path and releasing the bandwidth resource when the transmission network service cancels the affairs.
Further, the determining module further comprises:
the comparison module is used for selecting a path with the least expense from j paths for the service i according to the determined expense of each section of link and the residual bandwidth of each section of link, calculating the minimum residual bandwidth of the path and comparing the minimum residual bandwidth with the bandwidth requirement information;
if the requirement of the bandwidth demand information is met, determining the path as an optimal path and carrying out service bearing;
if the cost does not meet the requirement of the bandwidth requirement information, sequentially selecting paths from low to high and comparing the paths with the bandwidth requirement information until an optimal path is determined;
and if all paths do not meet the requirement of the bandwidth requirement information, prompting that the service delivery fails.
An SDN-based transport network traffic path protection system, comprising:
a scheduling module, configured to set a path including a failed node or a failed link to a blocking state when a link or a node in the path fails, and reselect an optimal path for service bearer by using the scheduling system of any one of claims 5 to 7;
the updating module is used for periodically updating through the SDN controller, and switching the service path back to the original path if the fault node or the fault link of the original path is detected to be recovered; and if the failure node or the failure link of the original path is not recovered, deleting the original path.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A SDN-based transmission network service path scheduling method is characterized in that,
the SDN controller acquires transmission network topology information and state information, calculates the topology information to form a topology database, and determines the cost of each link section; calculating the current residual bandwidth of each link section according to the state information;
acquiring original address, destination address and bandwidth demand information of transmission network service;
the SDN controller calculates each available path according to the original address and the destination address;
and the SDN controller evaluates each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, the bandwidth demand information and each available path, and determines an optimal path for carrying the service.
2. The SDN-based transport network service path scheduling method of claim 1, further comprising deleting a corresponding transport network service path and releasing bandwidth resources if the transport network service is cancelled.
3. The SDN-based transport network traffic path scheduling method of claim 1,
and the SDN controller evaluates each path by adopting an optimal bandwidth allocation method according to the cost of each path, the minimum residual bandwidth of each link, the determined cost of each link section and the determined residual bandwidth of each link section, and the process of determining an optimal path for carrying out service is as follows:
selecting a path with the least expense from j paths for the service i according to the determined expense of each section of link and the remaining bandwidth of each section of link, calculating the minimum remaining bandwidth of the path, and comparing the minimum remaining bandwidth with bandwidth requirement information;
if the requirement of the bandwidth demand information is met, determining the path as an optimal path and carrying out service bearing;
if the cost does not meet the requirement of the bandwidth requirement information, sequentially selecting paths from low to high and comparing the paths with the bandwidth requirement information until an optimal path is determined;
and if all paths do not meet the requirement of the bandwidth requirement information, prompting that the service delivery fails.
4. A SDN-based transmission network service path protection method is characterized in that,
when a link or a node in a path fails, setting the path containing the failed node or the failed link to be in a blocking state, and reselecting an optimal path for service bearing by using the scheduling method of any one of claims 1 to 3;
the SDN controller is periodically updated, and if a fault node or a fault link of an original path is detected to be recovered, the service path is switched back to the original path; and if the failure node or the failure link of the original path is not recovered, deleting the original path.
5. A SDN-based transport network service path scheduling system, comprising:
the first acquisition module is used for acquiring transmission network topology information and state information through an SDN controller, calculating the topology information to form a topology database, and determining the overhead of each link section; calculating the current residual bandwidth of each link section according to the state information;
the second acquisition module is used for acquiring the original address, the destination address and the bandwidth demand information of the transmission network service;
a calculation module, configured to calculate, by the SDN controller, each available path according to the original address and the destination address;
and the determining module is used for evaluating each path by adopting an optimal bandwidth allocation method according to the overhead of each link section, the residual bandwidth of each link section, the bandwidth demand information and each available path through the SDN controller, and determining an optimal path for carrying the service.
6. The SDN based transport network traffic path scheduling system of claim 5, further comprising:
and the deleting module is used for deleting the corresponding transmission network service path and releasing the bandwidth resource when the transmission network service cancels the affairs.
7. The SDN based transport network traffic path scheduling system of claim 5, wherein the determining module further comprises:
the comparison module is used for selecting a path with the least expense from j paths for the service i according to the determined expense of each section of link and the residual bandwidth of each section of link, calculating the minimum residual bandwidth of the path and comparing the minimum residual bandwidth with the bandwidth requirement information;
if the requirement of the bandwidth demand information is met, determining the path as an optimal path and carrying out service bearing;
if the cost does not meet the requirement of the bandwidth requirement information, sequentially selecting paths from low to high and comparing the paths with the bandwidth requirement information until an optimal path is determined;
and if all paths do not meet the requirement of the bandwidth requirement information, prompting that the service delivery fails.
8. A SDN-based transport network traffic path protection system, comprising:
a scheduling module, configured to set a path including a failed node or a failed link to a blocking state when a link or a node in the path fails, and reselect an optimal path for service bearer by using the scheduling system of any one of claims 5 to 7;
the updating module is used for periodically updating through the SDN controller, and switching the service path back to the original path if the fault node or the fault link of the original path is detected to be recovered; and if the failure node or the failure link of the original path is not recovered, deleting the original path.
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