CN106911516A - A kind of software defined network controller dispositions method - Google Patents
A kind of software defined network controller dispositions method Download PDFInfo
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- CN106911516A CN106911516A CN201710167522.4A CN201710167522A CN106911516A CN 106911516 A CN106911516 A CN 106911516A CN 201710167522 A CN201710167522 A CN 201710167522A CN 106911516 A CN106911516 A CN 106911516A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
Abstract
The present invention relates to a kind of software defined network controller dispositions method, belong to technical field of communication network.The method is comprised the following steps：Communication overhead between step 1, modeling candidate's controller and interchanger；Step 2, modeling candidate controller load restrictive condition；Step 3, modeling candidate's controller node number of degrees restrictive condition；Bitrate constraints are extended to when step 4, modeling interchanger, interchanger candidate's controller set is determined；Step 5, modeling candidate's controller and interchanger association identification restrictive condition；Step 6, in the case where controller and interchanger restrictive condition is met, based on controller communication overhead minimize determine controller deployment strategy.The method can optimize and determine SDN controller deployment strategys, so as to realize controller minimizing overhead in the case where the restrictive conditions such as controller load, exchange service characteristic are considered.
Description
Technical field
The invention belongs to technical field of communication network, it is related to a kind of software defined network controller dispositions method.
Background technology
Software defined network (Software Defined Networks, SDN) is proposed by Stanford Univ USA, with
The new and innovative network platform based on OpenFlow.The typical architecture of SDN is divided into three layers, and the superiors are application layer, including each
Plant different business and applications；Intermediate layer is key-course, the layout of main responsible processing data forwarding unit resource, safeguards network
Topological sum status information etc.；The bottom is data Layer, main to be responsible for the data processing based on flow table, forwarding and state collection.SDN
Key property is separated for control plane with datum plane, centralized network control, open between key-course and data Layer equipment
Network interface, network can be programmed by external program.Because key-course is separated with data Layer so that quickly open and Configuration network
Connection Service becomes possibility.In SDN frameworks, intelligentized SDN controllers can obtain the global view of network, and can
Control the data transfer equipment of whole network.
However, SDN centerized fusions also bring SDN scalability problem.As network size increases, SDN nets
Network only relies on single controller multiple threads mode, it will be difficult to ensure network QoS, and single controller has single point failure etc. and asks
Topic, considers in terms of network stabilization, security etc., and multi-controller deployment turns into current and solves SDN scalability
Main stream approach.Research shows that position, quantity that multi-controller is disposed in a network will all make a big impact to network performance,
Therefore SDN controller deployment issue turns into one of current SDN research emphasis.
Document [Adlen Ksentini, Miloud Bagaa, Tarik Taleb, Ilangko Balasingham.On
using bargaining game for optimal placement of SDN controllers.2016IEEE
International Conference on Communications (ICC)] propose that a kind of joint considers controller with control
Between device between time delay and controller and interchanger time delay location of controls system of selection, but the method do not consider to hand in network
Change planes practical business otherness.Document [Long Yao, Peilin Hong, Wen Zhang, Jianfei Li, Dan
Ni.Controller placement and flow based dynamic management problem towards
SDN.2015IEEE International Conference on Communication Workshop (ICCW)] propose one
Kind based on SDN switch node weights controller dispositions method, but author only by telephone net node in network topology
Next-hop neighbor node number models exchange service otherness, does not consider multi-hop link performance.Document [Tracy
Yingying Cheng,Mengqing Wang,Xiaohua Jia.QoS-guaranteed controller placement
In SDN.2015IEEE Global Communications Conference (GLOBECOM)] one kind is proposed to improve network
QoS is disposed for the controller of target, but only controller side time delay is modeled, and does not consider that exchanger side time delay and link are opened
The factors such as pin.
The content of the invention
In view of this, it is an object of the invention to provide a kind of software defined network controller dispositions method, the method energy
It is enough that in the case where the restrictive conditions such as controller load, exchange service characteristic are considered, optimization determines SDN controller deployment strategys,
So as to realize controller minimizing overhead.
To reach above-mentioned purpose, the present invention provides following technical scheme：
A kind of software defined network controller dispositions method, the method is comprised the following steps：Step 1, modeling candidate's control
Communication overhead between device and interchanger；Step 2, modeling candidate controller load restrictive condition；Step 3, modeling candidate's controller
Node number of degrees restrictive condition；Bitrate constraints are extended to when step 4, modeling interchanger, interchanger candidate's controller set is determined；
Step 5, modeling candidate's controller and interchanger association identification restrictive condition；Step 6, meeting controller and interchanger limitation bar
Under part, minimized based on controller communication overhead and determine controller deployment strategy.
Further, the step 1 is specifically included：
Assuming that can deployment controller, communication overhead between modeling candidate's controller and interchanger at all interchangers in network
It is communication overhead summation between all candidate's controllers and associated interchanger, i.e.,Wherein, DijIt is i-th candidate
Corresponding communication overhead when controller is associated with j-th interchanger, respectively with Ci, VjRepresent i-th candidate's controller and j-th
Interchanger, yijIt is CiWith VjBetween association identification, yij=1 represents CiWith VjAssociation, otherwise, yij=0,1≤i≤M, 1≤j≤
N, wherein M, N are respectively the number of network central control device and interchanger.
Further, the DijBe defined as communication link propagation delay, message transmission time delay and request message queuing delay it
With that is,Wherein,Represent CiWith VjCommunication link propagation delay during association,Represent CiWith VjBetween
Message transmission time delay,Represent VjRequest message in CiThe queuing delay at place, if i=j
It is describedIt is defined asWherein, LijRepresent CiWith VjBetween link range, v0It is Electromagnetic Wave Propagation speed
Degree, It is CiWith VjBetween h hop links distance, HijIt is CiWith VjBetween transmission path hop count；
It is describedIt is defined asWherein, λjRepresent VjRequest message arrival rate, β represent interchanger ask
Message packets size,Represent CiWith VjBetween h hop links footpath transmission rate；
Each candidate's controller processing switch message process is modeled as M/M/1 queuing models, and interchanger request message
Reach and obey poisson arrival process,It is defined asWherein σiRepresent CiProcess the Mean Speed of request message, Si
Represent and CiThe set of all interchangers of association.
Further, in step 2, modeling candidate controller load restrictive condition is the load difference of any two controller
Less than given threshold value, i.e., for arbitrary controller i, k, haveWherein, ξ is that controller load is poor
Exclusive-OR gate limit value.
Further, in step 3, candidate's controller node number of degrees restrictive condition is modeled, specifically, N is madeiIt is CiA jump
Neighbor node number, selected controller node should meet a hop neighbor interstitial content and be more than given threshold valueI.e. when and only
WhenCiIt can be target controller.
Further, in step 4, interchanger propagation delay time and bitrate constraints are modeled, specially：If CiWith VjAssociation,
Then need to meet VjPropagation delay time restrictive conditionWhereinIt is VjMaximum transmitted time delay can be allowed；Also then need to meet VjPass
Defeated bitrate constraintsWhereinIt is VjMinimum transmission rate requirements；According to propagation delay time and speed qualifications, can
Determine VjCandidate's controller set
Further, in steps of 5, modeling interchanger and controller association identification restrictive condition：①yij∈{0,1}；②③④If 5.Then yij=0.
Further, in step 6, it is minimum based on controller communication overhead in the case where controller, interchanger restrictive condition is met
Change and determine controller deployment strategy, i.e.,
The beneficial effects of the present invention are：The method of the invention can consider controller load, interchanger industry
Under the restrictive conditions such as business characteristic, optimization determines SDN controller deployment strategys, so as to realize controller minimizing overhead.
Brief description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is software network interchanger, controller schematic diagram of a scenario；
Fig. 2 is the schematic flow sheet of the method for the invention.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
A kind of software defined network controller dispositions method of the present invention, it is assumed that distributed director uses flat control
Mode processed, all controllers are placed on disjoint region, and respective network is managed respectively.Status phase between each controller
Deng, and in-band communications are carried out by East and West direction interface.And controller uses quilt to issuing for SDN switch device request message
Dynamic model formula.
Fig. 1 is software network interchanger, controller schematic diagram of a scenario, and interchanger is associated with into different controls by strategy
Device, in the case where most controller communication overhead is minimized, realizes centralized Control of the controller to whole network.
Fig. 2 is the schematic flow sheet of the method for the invention, as illustrated, the method for the invention specifically includes following step
Suddenly：
1) communication overhead between modeling candidate's controller and interchanger：
Communication overhead is between all candidate's controllers and associated interchanger between modeling candidate's controller and interchanger
Communication overhead andWherein, DijCorresponding communication overhead when being associated with j-th interchanger for i-th candidate's controller,
Respectively with Ci, VjRepresent i-th candidate's controller and j-th interchanger, yijIt is CiWith VjAssociation identification, yij=1 represents CiWith
VjAssociation, otherwise, yij=0,1≤i≤M, 1≤j≤N, wherein M, N are respectively the number of network central control device and interchanger.
The DijCommunication link propagation delay, message transmission time delay and request message queuing delay sum are defined as, i.e.,Wherein,Represent CiWith VjCommunication link propagation delay during association,Represent CiWith VjBetween message pass
Defeated time delay,Represent VjRequest message in CiThe queuing delay at place.
It is describedIt is defined asWherein, LijRepresent CiWith VjBetween link range, v0It is Electromagnetic Wave Propagation speed
Degree； It is CiWith VjBetween h hop links distance, HijIt is CiWith VjBetween transmission path hop count.It is described
It is defined asWherein, λjRepresent VjRequest message arrival rate, β represents interchanger request message data package size,Represent CiWith VjBetween h hop links footpath transmission rate.It is describedIn definition procedure, the treatment of each candidate's controller is handed over
Message process of changing planes is modeled as M/M/1 queuing models, and interchanger request message is reached and obeys poisson arrival process,It is defined asWherein σiRepresent CiProcess the Mean Speed of request message, SiRepresent and CiThe collection of all interchangers of association
Close.
2) modeling candidate controller load restrictive condition：
Modeling candidate controller load restrictive condition is less than given threshold value for the load difference of any two controller,
I.e.：For arbitrary controller i, k, haveWherein, ξ is controller load difference threshold value.The limit
Condition processed ensure that in SDN load balancing between different controllers.
3) candidate's controller node number of degrees restrictive condition is modeled：
Make NiIt is CiA hop neighbor interstitial content, selected controller node should meet a hop neighbor interstitial content and be more than
Given threshold valueI.e. and if only ifCiIt can be target controller.The restrictive condition can to a certain extent be reduced and asked
Solve the Algorithms T-cbmplexity of optimal deployment strategy problem.
4) interchanger candidate's controller set is determined：
If CiWith VjAssociation, then need to meet VjPropagation delay time restrictive condition isWhereinIt is VjMaximum can be allowed
Propagation delay time；If CiWith VjAssociation, then need to meet bitrate constraints and beWhereinIt is VjMinimum transmission rate requirements.
According to propagation delay time and speed qualifications, it may be determined that VjCandidate's controller set
5) modeling candidate's controller and interchanger association identification restrictive condition：
①yij∈{0,1}；②③④If 5.Then yij=0, wherein limiting bar
1. part represents that association identification is belonging to 0 or 1 Boolean variable；2. restrictive condition represents that a SDN switch can only be with a control
Device association processed；3. restrictive condition represents the controller number of all SDN switch associations and no more than candidate's controller number；
All of SDN switch must be associated with controller during 4. restrictive condition represents network；Restrictive condition is exchanged in 5. representing network
Controller associated by machine should belong to respective candidate's controller set.
6) minimized based on controller communication overhead and determine controller deployment strategy：
In the case where controller, interchanger restrictive condition is met, minimized based on controller communication overhead and determine controller deployment
Strategy, i.e.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of software defined network controller dispositions method, it is characterised in that：The method is comprised the following steps：
Communication overhead between step 1, modeling candidate's controller and interchanger；
Step 2, modeling candidate controller load restrictive condition；
Step 3, modeling candidate's controller node number of degrees restrictive condition；
Bitrate constraints are extended to when step 4, modeling interchanger, interchanger candidate's controller set is determined；
Step 5, modeling candidate's controller and interchanger association identification restrictive condition；
Step 6, in the case where controller and interchanger restrictive condition is met, minimized based on controller communication overhead and determine controller portion
Administration's strategy.
2. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：The step 1 has
Body includes：
Assuming that in network at all interchangers can deployment controller, modeling candidate's controller and interchanger between communication overhead be institute
There is communication overhead summation between candidate's controller and associated interchanger, i.e.,Wherein, DijIt is i-th candidate's control
Corresponding communication overhead when device is associated with j-th interchanger, respectively with Ci, VjRepresent i-th candidate's controller and j-th exchange
Machine, yijIt is CiWith VjBetween association identification, yij=1 represents CiWith VjAssociation, otherwise, yij=0,1≤i≤M, 1≤j≤N, its
Middle M, N are respectively the number of network central control device and interchanger.
3. a kind of software defined network controller dispositions method as claimed in claim 2, it is characterised in that：The DijIt is defined as
Communication link propagation delay, message transmission time delay and request message queuing delay sum, i.e.,Wherein,Table
Show CiWith VjCommunication link propagation delay during association,Represent CiWith VjBetween message transmission time delay,Represent VjRequest disappear
Breath is in CiThe queuing delay at place, if i=j
It is describedIt is defined asWherein, LijRepresent CiWith VjBetween link range, v0It is propagation velocity of electromagnetic wave, It is CiWith VjBetween h hop links distance, HijIt is CiWith VjBetween transmission path hop count；
It is describedIt is defined asWherein, λjRepresent VjRequest message arrival rate, β represents interchanger request message number
According to bag size,Represent CiWith VjBetween h hop links footpath transmission rate；
Each candidate's controller processing switch message process is modeled as M/M/1 queuing models, and interchanger request message is reached
Poisson arrival process is obeyed,It is defined asWherein σiRepresent CiProcess the Mean Speed of request message, SiRepresent
With CiThe set of all interchangers of association.
4. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：In step 2, build
Mould candidate controller load restrictive condition is less than given threshold value for the load difference of any two controller, i.e., for arbitrary
Controller i, k, haveWherein, ξ is controller load difference threshold value.
5. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：In step 3, build
Mould candidate's controller node number of degrees restrictive condition, specifically, makes NiIt is CiA hop neighbor interstitial content, selected controller section
Point should meet a hop neighbor interstitial content and be more than given threshold valueI.e. and if only ifCiIt can be target controller.
6. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：In step 4, build
Mould interchanger propagation delay time and bitrate constraints, specially：If CiWith VjAssociation, then need to meet VjPropagation delay time restrictive conditionWhereinIt is VjMaximum transmitted time delay can be allowed；Also then need to meet VjTransmission rate restrictive conditionWhereinIt is VjMinimum transmission rate requirements；According to propagation delay time and speed qualifications, it may be determined that VjCandidate's controller set
7. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：In steps of 5, build
Mould interchanger and controller association identification restrictive condition：①yij∈{0,1}；②③④⑤
IfThen yij=0.
8. a kind of software defined network controller dispositions method as claimed in claim 1, it is characterised in that：In step 6, exist
Meet under controller, interchanger restrictive condition, minimized based on controller communication overhead and determine controller deployment strategy, i.e.,
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| CN108092895A (en) * | 2017-12-26 | 2018-05-29 | 重庆邮电大学 | A kind of software defined network joint route selection and network function dispositions method |
| CN108206790A (en) * | 2018-01-11 | 2018-06-26 | 重庆邮电大学 | A kind of selection of SDN joint routes and resource allocation methods based on network slice |
| CN109088755A (en) * | 2018-08-01 | 2018-12-25 | 南京大学 | A kind of Complex event processing system deployment method under edge calculations |
| CN110034955A (en) * | 2019-03-26 | 2019-07-19 | 重庆邮电大学 | A kind of target controller choosing method considering plurality of switches migration index |
| CN111770515A (en) * | 2020-06-28 | 2020-10-13 | 重庆邮电大学 | SDN controller deployment method based on network cost optimization |
| CN112305973A (en) * | 2020-11-12 | 2021-02-02 | 中国电子科技集团公司第五十四研究所 | Controller cluster load sharing method based on link attributes |
| CN114979007A (en) * | 2022-05-18 | 2022-08-30 | 公诚管理咨询有限公司 | Load balancer adjusting method and system based on 5G core network NFV slicing technology |
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| CN108092895A (en) * | 2017-12-26 | 2018-05-29 | 重庆邮电大学 | A kind of software defined network joint route selection and network function dispositions method |
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| CN108206790A (en) * | 2018-01-11 | 2018-06-26 | 重庆邮电大学 | A kind of selection of SDN joint routes and resource allocation methods based on network slice |
| CN109088755A (en) * | 2018-08-01 | 2018-12-25 | 南京大学 | A kind of Complex event processing system deployment method under edge calculations |
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| CN110034955A (en) * | 2019-03-26 | 2019-07-19 | 重庆邮电大学 | A kind of target controller choosing method considering plurality of switches migration index |
| CN110034955B (en) * | 2019-03-26 | 2022-03-22 | 重庆邮电大学 | Target controller selection method considering multiple switch migration indexes |
| CN111770515A (en) * | 2020-06-28 | 2020-10-13 | 重庆邮电大学 | SDN controller deployment method based on network cost optimization |
| CN111770515B (en) * | 2020-06-28 | 2022-03-29 | 重庆邮电大学 | SDN controller deployment method based on network cost optimization |
| CN112305973A (en) * | 2020-11-12 | 2021-02-02 | 中国电子科技集团公司第五十四研究所 | Controller cluster load sharing method based on link attributes |
| CN112305973B (en) * | 2020-11-12 | 2021-07-27 | 中国电子科技集团公司第五十四研究所 | Controller cluster load sharing method based on link attributes |
| CN114979007A (en) * | 2022-05-18 | 2022-08-30 | 公诚管理咨询有限公司 | Load balancer adjusting method and system based on 5G core network NFV slicing technology |
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