CN103795596A - Programmable control SDN measuring system and method - Google Patents
Programmable control SDN measuring system and method Download PDFInfo
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Abstract
The invention discloses a programmable control SDN measuring system and a processing method. According to the programmable control SDN measuring system, on the basis of a network controller of a network control layer and a bottom-layer switch of a data transmission layer, two components are additionally arranged on a network application layer, the two components comprise a programmable control measuring component in charge of centralized management of measuring tasks and an adaptive module used for supporting the measuring component, and the bottom-layer switch is improved to be a programmable control switch in charge of specific execution of the measuring tasks. In this way, the programmable control measuring component and the programmable control switch form a control loop for network measurement. The programmable control SDN measuring system is simple in structure, easy to obtain and flexible in configuration and has powerful functions, a programmable control measuring system and method can be provided according to various network measurement algorithms and different measuring tasks, and the characteristics that an SDN can be defined by software, control and forwarding are separated from each other and an active measurement mode is adopted are brought into full play. The programmable control SDN measuring system and the processing method have good popularization and application prospect.
Description
Technical field
The present invention relates to a kind of for software defined network SDN(Software Defined Network) network measuring system and the method for measurement of control able to programme, exactly, SDN network measuring system of the present invention fully adapt to and utilized can software definition characteristic, and control and forwarding are separated, the central controlled feature of network controller, again the function of network controller and switch is expanded, can realize measurement and the analysis of the arbitrary path on network being carried out to multinomial performance index, thereby for existing SDN network provides a kind of network measuring system and method for measurement of control able to programme, belong to the technical field of network measure.
Background technology
Along with the fast development of the network information technology, the Internet has become indispensable in the world important infrastructure, and it has all brought huge convenient and abundant intension to people's study, production, work, life and even amusement, leisure etc.But under the background day by day complicated in the Internet, volume is increasingly huge, people also improve day by day to the performance requirement of network thereupon.How the various aspects of network are made to objective appraisal, improve network performance, and then for user provides high-quality service, meet different network applications and the demand of network user, not only significant, and, very necessary.
Network measure is to adopt method and the technology set, by software or hardware tools come test network running status, characterize the summation of a series of test activities of network characteristic.Network measure, for the overall operation situation of grasping network, improves network performance and has very important effect.By network measure, network management personnel can obtain various network performance parameters, for example: propagation delay time, packet loss, bandwidth etc., different performance parameters has reflected the performance of network different aspect.These performance parameters, to instructing network management personnel's routine work very helpful, can help their awareness network behavior, and it is congested that discovering network may exist, and improve network resource utilization.
Software defined network SDN(Software Defined Network) be a kind of new network framework that Stanford Univ USA proposes, the design concept of SDN is that the control plane of network is separated with data retransmission plane, and realizes the control of able to programmeization.
OpenFlow network based on OpenFlow agreement is a kind of implementation of SDN.Shown in Figure 1: the composition structure of OpenFlow network mainly comprises network controller and bottom switch.Wherein, network controller can be considered network operating system, has the overall visual field, and bottom switch is carried out centralized management and controlled.The network user can use the standard SDN API that network controller provides to upper-layer service to programme, and namely uses the mode developing network application of software definition.Bottom switch does not possess any network intelligence, and the stream table that it is only responsible for issuing according to network controller is carried out the operations such as parsing, coupling and forwarding to packet.
At present, mainly contain following several prior art about the network measure of SDN:
(1) adopt traditional network measure method to measure: can adopt the mode of initiatively measurement or passive measurement to measure network performance index, for example: by initiatively sending Internet Control Message Protocol ICMP(Internet Control Message Protocol) survey grouping and obtain the parameters such as network delay, grouping packet loss and connectedness, or divide into groups at network key node deploy measurement mechanism capture-data, and carry out statistical analysis, thereby obtain network state and performance index.Although traditional network measure method is a lot,, these methods all can not be utilized the central controlled feature of SDN network.
(2) measurement about primary statistics information such as stream table, stream list item and ports of preserving based on OpenFlow switch: according to OpenFlow specification, controller can be by the statistical information in inquiry respective switch, the performance condition of awareness network, this is a kind of mode of passive measurement.If adopted in this way, in the time that needs obtain a large amount of network information or while needing the Real-time Obtaining network information, will introduce huge extra load, cause communication capacity between disposal ability and controller and the switch of controller to become the bottleneck of network, have a strong impact on the properties of OpenFlow network itself; In addition, this metering system is understood the entirety of network and the understanding of network end-to-end behavior will be very difficult.
(3) Ofpeck---another kind of for measuring the scheme of OpenFlow network performance: it adopts the mode of initiatively measuring, and on the machine can isolated operation being connected with OpenFlow switch at any one, Ofpeck uses some simple instruments (for example ping and wget) to collect some parameters about network performance.Major parameter has following:
Flow Setup Time(stream is shown settling time): in OpenFlow switch, after a packet arrives, just start to extract occurrence and carry out stream table coupling.When it fails to match, exchange opportunity reports controller and waits for that controller issues new stream list item, for its represented data flow is set up new transmission path.The duration of this process is exactly Flow Setup Time.In OpenFlow network, Flow Setup Time is a very important network performance index, both, for weighing the disposal ability of switch to packet, can embody again the information interactive process between switch and controller.In Ofpeck scheme, normally carried out a ping at interval of 10 seconds and operate to measure this index.
RTT(round-trip delay) and Loss Rate(packet loss): in Ofpeck scheme, operate by carrying out a ping at interval of 1 second, for measuring round-trip delay and the packet loss of given host.
Wget Time(obtains the time of web server response): in Ofpeck scheme, connect by the Web server of carrying out wget order and standard, the disposal ability of the OpenFlow network while happening suddenly newly-built a large amount of connection for weighing.
The information that Ofpeck scheme is collected only limits to local host, and these information are stored in database termly.But the measurement index of this measurement scheme is limited, and can not measure the performance between the switch in OpenFlow network, also not utilize the feature of SDN network, just carry out simple performance measurement by third-party instrument.
Summary of the invention
In view of this, the object of this invention is to provide a kind of SDN network measuring system and method for measurement of control able to programme, be used for overcoming above-mentioned shortcoming of the prior art, system and method of the present invention can make full use of the characteristic that SDN network can software definition, and control and forwarding be separated, the central controlled feature of controller, thus the parameters of network is made to objective evaluation, to improve network performance, provide high-quality service.
In order to achieve the above object, the invention provides a kind of software defined network SDN measuring system of control able to programme, include: the network controller of network control layer and the bottom switch of data transfer layer; It is characterized in that: this system is also provided with: two building blocks that network application layer is set up: the adaptation module of assembly is measured in the measurement assembly of control able to programme and support, and bottom switch is improved to the switch of control able to programme; Wherein:
The measurement assembly of control able to programme, the parts based on supporting the exploitation of the application programming interfaces API for SDN network measure that the adaptation module of measuring assembly provides, be responsible for the management of measurement task, its function comprises: the one, by the Measurement Algorithm storehouse of containing many algorithms of its setting, for the survey crew algorithm suitable according to different measuring task choosing, and the corresponding series operation of customization, then task parameters and operational order are issued to bottom switch, instruct its work; The 2nd, the measurement data reporting according to bottom switch is calculated and stores it; The 3rd, issue and carry the con-figuration information of measuring operational order code, the processing procedure of control survey task to bottom switch; And in the time that fundamental measurement operation cannot meet measurement task, this measurement assembly can be according to the specific requirement of measuring type and Measurement Algorithm, the processing procedure of self-defined measurement operation, and be issued to bottom switch by OpenFlow agreement, at stream table after the match is successful, carry out corresponding operating, realize the processing to detection packet;
The switch of control able to programme, on bottom switch basis, setting up following three parts forms: programmable measurement operation storehouse, programmable measurement module and measurement queue management module, be responsible for the data flow that enters switch according to the matching result of various flows table, effectively distinguish the flow of detection packet or general data, carry out again corresponding operating, realize the processing of detection packet control able to programme, complete measurement task; Its function comprises: carry out structural exploration bag according to measuring the operation that puts rules into practice of the parameter of task, and be stored in that to measure queue medium to be sent; Complete transmission, forwarding and the reception of detection packet, and the extraction of measurement data and reporting; Also there is expanded function: allow the self-defined new measurement of programming to operate and be deployed in switch, so that survey crew can be carried out measurement task more expediently in programming Control mode;
Support to measure the adaptation module of assembly, also be to utilize to encapsulate to build for the SDN API of network measure to form, be responsible for transmission information between the measurement assembly of control able to programme and network controller, and provide the SDN API that is exclusively used in network measure business, adopt the measurement assembly of SDN art designs control able to programme for technological development personnel, realize the logic control of network measure business; Because of after a measurement event of network controller registration, just can make all measurement message mutual between the measurement assembly of control able to programme and the switch of control able to programme via network controller, and in reciprocal process, this adaptation module is responsible for two operations: the one, and the task parameters issuing for measurement assembly encapsulates, and is issued in switch by network controller; The 2nd, the measurement data reporting for switch is resolved, and with the measurement assembly that facilitates control able to programme, data is processed.
In order to achieve the above object, the present invention also provides a kind of method of measurement of software defined network SDN measuring system of control able to programme, it is characterized in that: described method comprises following operating procedure:
(1) the measurement assembly of control able to programme obtains measurement task, calls respective algorithms structure measurement message, for instructing the switch fabric detection packet of programmable control system according to task parameters;
(2) support to measure the adaptation module of assembly and obtain the measurement message that the measurement assembly of control able to programme issues and process, then transfer to network controller to be issued to the switch of corresponding control able to programme;
(3) switch of the control able to programme of transmitting terminal carries out the structure of detection packet according to task parameters, and is stored to measurement queue, then queue is measured in inquiry periodically, thereby overtime detection packet is sent in network;
(4) switch that forwards the control able to programme of end is processed detection packet according to the matching result of stream table, and forwards from corresponding port;
(5) switch of the control able to programme of receiving terminal carries out respective handling according to stream table matching result to the detection packet of receiving, extracts measurement of correlation data, and is encapsulated in to measure in message and reports;
(6) network controller is transferred to the measurement message of reception to support to measure the adaptation module of assembly, and this adaptation module is processed measuring message, then transfers to measure assembly;
(7) measurement data that the measurement component stores of control able to programme receives, has judged whether measurement task, and determines whether need measurement result to calculate and store according to judged result.
Main innovation technology of the present invention is: the detection SDN network performance index that a kind of control able to programme is provided: comprise list/two-way time delay, bandwidth and the isoparametric measuring system of packet loss and method of measurement, the measurement assembly of the control able to programme of setting up in measuring system is wherein positioned at network application layer, is responsible for the centralized management of measurement task; The switch that improves the control able to programme of structure is positioned at data transfer layer, be responsible for the concrete execution of measurement task, thereby the control plane of this network measuring system and datum plane are separated from each other, adopt the mode of initiatively measuring, realize the measurement of the multinomial performance index of SDN network.Concrete innovation main points of the present invention are as follows:
1, the measurement assembly of control able to programme: develop and develop based on standard SDN API, be mainly in charge of measurement task.It is provided with has contained the Measurement Algorithm storehouse of measuring the many algorithms of heterogeneous networks performance index, also allows survey crew to define with programming mode simultaneously and adds other algorithm and carry out surveying work.
2, support to measure the adaptation module of assembly: between the measurement assembly and network controller of control able to programme, for being provided, network-oriented measures the SDN API of business, thereby allow survey crew to adopt SDN art designs to measure assembly, realize the logic control of network measure business.
3, the measurement of software programmable operation: abstract definition of the present invention some basic operations of network measure, and these basic operations are added to the form of instruction code in the switch of control able to programme, survey crew both can operate according to the different corresponding series of measurement task customization, so that, according to operational order execution measurement task, can defining and add other with programmable way again, bottom switch operates to support surveying work.
4, measure queue: the present invention defines and added the queue of measuring bag in the input rank of existing SDN switch, for storing each detection packet to be sent, and guarantee the time interval between each detection packet by each detection packet is added to timestamp.
Like this, formed the control loop of network measure by the measurement assembly of control able to programme and the switch of control able to programme, simple in structure, easy enforcement, flexible configuration, powerful, a kind of measuring system and method for measurement of control able to programme can be provided for multiple network Measurement Algorithm and different measurement tasks, take full advantage of the characteristic that SDN network can software definition, and control the feature being separated with forwarding.Therefore, popularizing application prospect of the present invention is good.
Accompanying drawing explanation
Fig. 1 is OpenFlow network configuration composition schematic diagram.
Fig. 2 is the SDN network measuring system structure composition schematic diagram of the present invention's control able to programme.
The mutual sequential chart of each parts when Fig. 3 is measuring system execution measurement task of the present invention.
Fig. 4 is the measurement task parameters format chart of measuring system of the present invention.
Fig. 5 is the self-defining operation form of measuring system of the present invention
Fig. 6 is the programmable measurement module workflow diagram in measuring system of the present invention.
Fig. 7 is the measurement queue workflow diagram schematic diagram of measuring system of the present invention
Fig. 8 is the measurement message structure figure of measuring system of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.
Referring to Fig. 2, introduce the structure composition of the SDN measuring system of the present invention's control able to programme: it is except the network controller of original network control layer and the bottom switch of data transfer layer, this system is also set up two building blocks at network application layer: the adaptation module of assembly is measured in the measurement assembly of control able to programme and support, and bottom switch is improved to the switch of control able to programme.Introduce respectively this three modular constructions and function below:
(1) the measurement assembly of control able to programme, it is the parts based on supporting the exploitation of the application programming interfaces API for SDN network measure that the adaptation module of measuring assembly provides, be responsible for the management of measurement task, its function comprises: the one, by the Measurement Algorithm storehouse of containing many algorithms of its setting, for the survey crew algorithm suitable according to different measuring task choosing, and the corresponding series operation of customization, then task parameters and operational order are issued to bottom switch, instruct its work; The 2nd, the measurement data reporting according to bottom switch is calculated and stores it; The 3rd, issue and carry the con-figuration information of measuring operational order code, the processing procedure of control survey task to bottom switch; And in the time that fundamental measurement operation cannot meet measurement task, this measurement assembly can be according to the specific requirement of measuring type and Measurement Algorithm, the processing procedure of self-defined measurement operation, and be issued to bottom switch by OpenFlow agreement, at stream table after the match is successful, carry out corresponding operating, realize the processing to detection packet.Wherein in Measurement Algorithm storehouse, not only store the multiple Measurement Algorithm for measuring the heterogeneous networks performance index that comprise time delay and bandwidth, also allow User Defined and add other Measurement Algorithm, for expanding existing Measurement Algorithm storehouse, realize the measurement of multiple network performance index.
(2) switch of control able to programme, on bottom switch basis, setting up following three parts forms: programmable measurement operation storehouse, programmable measurement module and measurement queue management module, be responsible for the data flow that enters switch according to the matching result of various flows table, effectively distinguish the flow of detection packet or general data, carry out again corresponding operating, realize the processing of detection packet control able to programme, complete measurement task; Its function comprises: carry out structural exploration bag according to measuring the operation that puts rules into practice of the parameter of task, and be stored in that to measure queue medium to be sent; Complete transmission, forwarding and the reception of detection packet, and the extraction of measurement data and reporting; Also there is expanded function: allow the self-defined new measurement of programming to operate and be deployed in switch, so that survey crew can be carried out measurement task more expediently in programming Control mode.
The function of specifically introducing again three parts that the switch of control able to programme sets up is as follows:
(A) programmable measurement operation storehouse, is positioned at exchange data passage, for storing the detection packet of carrying out network measure from constructing, send, be forwarded to the various operational orders of whole measuring process of reception; Because existing bottom switch only supports that more than ten plant basic operation, and not for the operation of network measure definition, for network enabled measurement better, on bottom switch, expand and build this measurement operation storehouse.Concrete expansion mode is:
The first, directly arrange and multiplely shielded the details of heterogeneous networks Measurement Algorithm and make it basic operation instruction that possesses universality (particular content referring to explanation) below, and add in this programmable measurement operation storehouse.
Multiple fundamental measurement operational order in the network measure that the present invention sets comprises following content:
Message encapsulation operation: be responsible for detection packet to be packaged into dissimilar message, comprise the detection packet of traditional Ethernet message structure encapsulation and the detection packet with the message structure carrying measurement data of other type, select for survey crew; The different structure of message has determined that detection packet can measure the performance of different switches in the whole network, can measure for certain specific virtual net again, can also measure for a certain specific transactions.
Timestamp operation: be responsible for detection packet and add timestamp at assigned address: transmitting terminal switch is according to the calculation of parameter time offset of the task of measurement, and add transmitting time for detection packet and stab; This time offset represents that different detection packet in the measurement sequence of each measurement task are with respect to the transmission time interval between first detection packet; Receiving terminal switch adds the detection packet receiving to arrive timestamp, represents the time of advent of this bag.
Data stuffing operation: according to measuring task parameters, be responsible for filling each field information of data division in detection packet, for show this detection packet task identification ID, measure every base attribute of type and measurement result.
Measurement message constructing operation: be responsible for extracting related data the report network controller in detection packet, receiving terminal switch completes after the processing of detection packet, this operation will be extracted measurement data from detection packet, and by these data encapsulation measuring in message, report to measurement assembly.
The second, cannot meet measurement task in basic measurement operation, the measurement assembly of control able to programme can be according to the specific requirement of measuring type and Measurement Algorithm, and the processing procedure of self-defined measurement operation is also issued to switch by OpenFlow agreement.Namely, process flexibly dissimilar detection packet for making to exchange function, measurement assembly by control able to programme issues the con-figuration information that carries detection packet operational order code to switch by OpenFlow agreement, new measurement operation with software definition switch to detection packet, realizes and carries out measurement task in programming Control mode.Switch is using this section of instruction code as the extended operation to detection packet processing, and is stored in this programmable measurement operation storehouse; Once stream table, the match is successful, with regard to the corresponding operating of complete detection packet.
In network measure, the measurement of different network performance indexes is also not quite similar to the requirement of detection packet, and the parameter such as the content of such as detection packet, size, transmission number, transmission time interval, all needs to be determined on a case-by-case basis.The parameters of the detection packet of the network measure task of the switch fabric of control able to programme is also mutually different, but, the fundamental measurement operational order that the present invention therefrom extracts some relevant detection packet and carries out network measure, add to again in the programmable measurement operation storehouse of switch, can the instruction code of newly operation be handed down to switch by OpenFlow agreement in the mode of software definition again, thereby realize the control able to programme of network measure, network enabled is measured better.
(B) programmable measurement module, is positioned at Switch control passage, because the bottom switch of existing SDN network can only be carried out setting operation, voluntarily construction data bag to the packet of flowing through according to the matching result of stream table.This programmable measurement module is responsible for resolving and is measured the task parameters and the operational order that carry in message, then with the construction process of the mode control detection packet of software definition; Relate to multiple basic operations that are endowed different priorities because constructing a complete detection packet, programmable measurement module is according to the different priorities of operation, carry out one by one according to operational order regulation order, finally complete the structure of each detection packet, and be stored in measurement queue; Certainly, the measurement assembly of control able to programme also can be revised by issuing message the priority of wherein each operation.
(C) measure queue management module, be positioned at exchange data passage, be in charge of and be stored in the detection packet to be sent that self-defining surveying party lists; This measurement queue is constructed and detection packet to be sent for storing, then via the cyclic polling of this measurement queue management module, realizes the transmission on time of detection packet.Carry timestamp information because of each detection packet of measuring in queue, this measurement queue management module, as long as whether query time stamp is overtime, just can judge whether to send this detection packet; If desired, take out and transfer to data channel to process; Otherwise continue inquiry, until tail of the queue, to meet the requirement of measurement task to the time interval.
(3) adaptation module of assembly is measured in support, also be to utilize to encapsulate to build for the SDN API of network measure to form, be responsible for transmission information between the measurement assembly of control able to programme and network controller, and provide the SDN API that is exclusively used in network measure business, adopt the measurement assembly of SDN art designs control able to programme for technological development personnel, realize the logic control of network measure business.Because as long as after a measurement event of network controller registration, just can make all measurement message mutual between the measurement assembly of control able to programme and the switch of control able to programme via network controller, and in reciprocal process, this adaptation module is responsible for two operations: the one, and the task parameters issuing for measurement assembly encapsulates, and is issued in switch by network controller; The 2nd, the measurement data reporting for switch is resolved, and with the measurement assembly that facilitates control able to programme, data is processed.
Referring to Fig. 3, introduce the concrete operation step of the method for measurement of the SDN network measuring system of the present invention's control able to programme:
Step 1, the measurement assembly of control able to programme obtains measurement task, calls respective algorithms structure measurement message, for instructing the switch fabric detection packet of programmable control system according to task parameters.This step comprises following content:
(11) obtain task and resolve task parameters: the measurement assembly of control able to programme obtains after measurement task, first to measurement task comprise task ID and measure type related network measure basic parameter resolve so that this measurement assembly can select correct Measurement Algorithm to carry out network measure;
(12) structure is measured message, encapsulation task parameter and operational order: the measurement assembly of control able to programme is according to the specific requirement of Measurement Algorithm, fill each field of task parameters and add operational order, for the switch of control able to programme in structural exploration packet procedures, call corresponding measurement operation according to the regulation of operational order, carry out the structure of detection packet, and complete the filling of each field in detection packet according to task parameters, finally this measurement task is stored in Task-list.
Step 2, supports to measure the adaptation module of assembly and obtains the measurement message that the measurement assembly of control able to programme issues and process, and then transfers to network controller to be issued to the switch of corresponding control able to programme.
Step 3, the switch of the control able to programme of transmitting terminal carries out the structure of detection packet according to task parameters, and is stored to measurement queue, then cyclic polling measurement queue, thereby overtime detection packet is sent in network.
This step comprises following content of operation:
(31) resolve and measure message, obtain message content: the switch of transmitting terminal control able to programme judges according to the type of the OpenFlow protocol message receiving whether it is to measure message, if, transfer to programmable measurement module, carry out subsequent step (32), otherwise, finish this method of measurement flow process;
(32) structural exploration bag be stored to measurement queue: programmable measurement module is according to the operational order of measuring in message, judge the priority of each operation, and successively carry out corresponding operating according to priority height, complete the associative operation that message encapsulation, data stuffing and timestamp add, after complete detection packet of construction complete, be stored to and measured queue wait transmission;
(33) regularly queue is measured in inquiry, send detection packet: the switch of transmitting terminal control able to programme, in running, is measured queue management module cyclic polling and measured queue, checks the timestamp that detection packet is carried, and after comparing with the current system time, know whether detection packet needs to send; If need, detection packet transferred to data channel to carry out the coupling of stream table, and be sent to network from corresponding port; Otherwise, continue inquiry, until measure queue afterbody.
Step 4, the switch that forwards the control able to programme of end is processed detection packet according to the matching result of stream table, and forwards from corresponding port.
Step 5, the switch of the control able to programme of receiving terminal carries out respective handling according to stream table matching result to the detection packet of receiving, extracts measurement of correlation data, and is encapsulated in to measure in message and reports.
This step comprises following content of operation:
(51) stream table coupling, determine whether detection packet: packet, being forwarded to after the switch of receiving terminal control able to programme, first carries out the coupling of stream table, determines whether detection packet, and whether the object switch ID that this bag carries is consistent with this switch ID; If so, according to matching result, carry out subsequent step (52); Otherwise, continue to forward;
(52) carry out corresponding operating, extracting measurement data also reports: the switch of receiving terminal control able to programme according to the result of stream table coupling to detection packet carry out comprise add arrive timestamp, extract measurement data, structure is measured message and encapsulate the series operation of measurement data, finally by this measurement information reporting to network controller.
Step 6, network controller is transferred to the measurement message of reception to support to measure the adaptation module of assembly, and this adaptation module is processed measuring message, then transfers to measure assembly.
Step 7, the measurement data that the measurement component stores of control able to programme receives, has judged whether measurement task, and determines whether need measurement result to calculate and store according to judged result.
This step comprises following content of operation:
(71) resolve and measure message, obtain measurement data: the measurement assembly of control able to programme receives to be supported to measure after the measurement message that the adaptation module of assembly reports, extract the data in this measurement message, and the measurement data of this extraction is stored in to corresponding task node in Task-list.
(72) calculating and stores it: whether have completed task in the measurement component inspection Task-list of control able to programme, if had, from chained list, take out this task, call corresponding Measurement Algorithm according to task parameters, the measurement data of being extracted according to step (71) by Measurement Algorithm again completes the calculating of measurement result, and shows and stores it to survey crew; If no, finish whole flow processs.
The present invention has carried out repeatedly implementing test, and the result of test is successfully, has realized goal of the invention.The situation of brief description embodiment below:
The 1st embodiment: in measuring system of the present invention, the measurement assembly of control able to programme, by controlling the complete behavior of its bottom switch and forwarding detection packet, is realized a kind of SDN network measure of control able to programme, specifically adopts following two kinds of modes:
(1) the measurement assembly of control able to programme is by sending measuring task parameters and operational order, then with the process of the switch fabric detection packet of the mode control bottom control able to programme of software definition.
The measurement assembly of control able to programme is according to the corresponding Measurement Algorithm of measurement task choosing of obtaining, and according to the Measurement Algorithm of selecting by the design parameter configuration distributing of the task of measurement to the switch of control able to programme, the form of measurement task as shown in Figure 4, wherein each measurement parameter has identified a complete measurement task, by SDN API, these parameters can be issued to switch and instruct its work, thereby survey the complete behavior of dividing into groups with the mode control switch fabric of software definition.These parameters should comprise following substance:
Task ID: the unique identification of each measurement task.
Measure type: show which kind of performance index is this measurement task need to measure.
Packet length: the byte number that shows detection packet.
Source switch ID: the ID that measures task source switch.
Object switch ID: the ID that measures task objective end switch.
Number between group: the number of surveying grouping.
Number in group: survey the detection packet number in grouping.
The time interval between group: survey the time interval between grouping.
The time interval in group: the time interval of surveying each detection packet in grouping.
Operational set: show the sequence of operations of customization, can give these and operate different priority, switch, by the instruction in parse operation set, is known corresponding operating and the execution sequence of required execution in detection packet construction process.
Extension: allow other task parameters of user add, for example each layer protocol head parameter.
(2) the measurement assembly of control able to programme can issue the switch of new operational order code to control able to programme, thus the operation of the switch of software definition control able to programme to detection packet processing.
According to the needs of the task of measurement, the measurement assembly of control able to programme can customize the code of associative operation instruction in detection packet processing procedure, and be issued to the switch of control able to programme, the switch of control able to programme is using this section of code as the extended operation that detection packet is processed, and is stored in it and measures in operation storehouse.Match after specific stream list item in detection packet, will carry out and measure operation accordingly in operation storehouse.
The measurement assembly of control able to programme is in the time of the measurement operation storehouse of the switch of configurating programmable control, and the new operational order adding can adopt form shown in Fig. 5, and wherein parameters is described as follows:
Operational order: illustrate which kind of type this operation belongs to, and mainly comprises establishment, deletion and retouching operation etc.
Operation is described: describe the code of detection packet processing procedure, show the parameter list of this action need reception and the process of processing.
The 2nd embodiment:
Referring to Fig. 6, the three kinds of basic operations of message encapsulation, data stuffing, interpolation timestamp that need take structural exploration bag, as example, are introduced the workflow of programmable measurement module:
The priority of above-mentioned three kinds of operations is successively decreased successively, and the input of programmable measurement module is the measurement message of control channel, and its output is the detection packet of having constructed.
Programmable measurement module is measured message by parsing, obtains the relevant parameter of measurement task, and successively carries out above-mentioned three kinds of operations, thereby completes the structure of detection packet, and is stored in measurement queue.
The 3rd embodiment:
With reference to figure 7, in the workflow of measurement queue management module, whether the detection packet of measuring in queue by regular inquiry arrives transmitting time, judge whether to take out this detection packet, and transfer to data channel to be for further processing, each inquiry is all take queue as sky or has inquired about to queue afterbody as end mark.
The 4th embodiment:
In the implementation of adaptation module, both can expand the primary message set of OpenFlow agreement, define and add new type of message, to support to measure communication; Also can expand to the Experimenter message in OpenFlow agreement the measurement message of definition subtype.The embodiment of the present invention is for Experimenter extension of message.Particular content brief description is as follows:
OpenFlow agreement to standard is expanded, support the message of measuring by interpolation, the measurement data that the switch of measurement task parameters that the measurement assembly of control able to programme issues or control able to programme is reported is all filled in this measurement message, adaptation module is by encapsulation or parsing to measurement message, support the communication between measurement assembly and the switch of control able to programme of control able to programme, this scheme of brief description:
Experimenter message is that being exclusively used in of defining in OpenFlow specification left the message that third party's network development personnel expand for, and message structure is shown in Figure 8, and wherein parameters is described as follows:
Ofp_header(OpenFlow message header): adopt the standard head of OpenFlow agreement, type field is wherein set to OFPT_EXPERIMENTER, and its value is 4, is shown to be Experimenter message.
Experimenter_id(measures message identifier): when third party developer will expand Experimenter message, need to specify an ID for it, the message of all its expansions all must have this identical No. ID.
Type(measures message subtype): the particular type that shows the Experimenter message of expansion.Preliminary definition of the present invention the measurement message of two types, be respectively to measure task requests message and the task of measurement response message, be used for sending measuring task or reporting measurement data.
Data(measures message body): carry the particular content of measuring message.
Expand by the Experimenter message in OpenFlow agreement, can define flexibly about the message format of measuring, can support better between the measurement assembly of control able to programme and the switch of control able to programme about the communication of measuring.
Claims (10)
1. SDN network measuring system and the processing method of a control able to programme, this measuring system is on the bottom switch basis of the network controller of network control layer and data transfer layer, network application layer is set up two building blocks: the measurement assembly of control able to programme and support to measure the adaptation module of assembly, and the switch that bottom switch is improved to control able to programme is formed; Wherein:
The measurement assembly of control able to programme, the parts based on supporting the exploitation of the application programming interfaces API for SDN network measure that the adaptation module of measuring assembly provides, be responsible for the management of measurement task, its function comprises: the one, by the Measurement Algorithm storehouse of containing many algorithms of its setting, for the survey crew algorithm suitable according to different measuring task choosing, and the corresponding series operation of customization, then task parameters and operational order are issued to bottom switch, instruct its work; The 2nd, the measurement data reporting according to bottom switch is calculated and stores it; The 3rd, issue and carry the con-figuration information of measuring operational order code, the processing procedure of control survey task to bottom switch; And in the time that fundamental measurement operation cannot meet measurement task, this measurement assembly can be according to the specific requirement of measuring type and Measurement Algorithm, the processing procedure of self-defined measurement operation, and be issued to bottom switch by OpenFlow agreement, at stream table after the match is successful, carry out corresponding operating, realize the processing to detection packet;
The switch of control able to programme, on bottom switch basis, setting up following three parts forms: programmable measurement operation storehouse, programmable measurement module and measurement queue management module, be responsible for the data flow that enters switch according to the matching result of various flows table, effectively distinguish the flow of detection packet or general data, carry out again corresponding operating, realize the processing of detection packet control able to programme, complete measurement task; Its function comprises: carry out structural exploration bag according to measuring the operation that puts rules into practice of the parameter of task, and be stored in that to measure queue medium to be sent; Complete transmission, forwarding and the reception of detection packet, and the extraction of measurement data and reporting; Also there is expanded function: allow the self-defined new measurement of programming to operate and be deployed in switch, so that survey crew can be carried out measurement task more expediently in programming Control mode;
Support to measure the adaptation module of assembly, also be to utilize to encapsulate to build for the SDN API of network measure to form, be responsible for transmission information between the measurement assembly of control able to programme and network controller, and provide the SDN API that is exclusively used in network measure business, adopt the measurement assembly of SDN art designs control able to programme for technological development personnel, realize the logic control of network measure business; Because of after a measurement event of network controller registration, just can make all measurement message mutual between the measurement assembly of control able to programme and the switch of control able to programme via network controller, and in reciprocal process, this adaptation module is responsible for two operations: the one, and the task parameters issuing for measurement assembly encapsulates, and is issued in switch by network controller; The 2nd, the measurement data reporting for switch is resolved, and with the measurement assembly that facilitates control able to programme, data is processed.
2. SDN network measuring system according to claim 1, it is characterized in that: described Measurement Algorithm storehouse not only stores the multiple Measurement Algorithm for measuring the heterogeneous networks performance index that comprise time delay and bandwidth, also allow User Defined and add other Measurement Algorithm, be used for expanding existing Measurement Algorithm storehouse, realize the measurement of multiple network performance index.
3. SDN network measuring system according to claim 1, it is characterized in that: the parameters of content, size, transmission number and the transmission time interval of the detection packet of the network measure task of the switch fabric of described control able to programme is all to determine according to the heterogeneous networks performance index that detect, although the parameters of each detection packet is different, the multiple measurement operation that detection packet is carried out is added in the programmable measurement operation storehouse of switch as basic measurement operation; Can also the instruction code of newly operation be handed down to switch by OpenFlow agreement in software definition mode, thereby realize the control able to programme of network measure, network enabled is measured better.
4. SDN network measuring system according to claim 3, is characterized in that: the multiple basic measurement operational order of described network measure comprises following content:
Message encapsulation operation: be responsible for detection packet to be packaged into dissimilar message, comprise the detection packet of traditional Ethernet message structure encapsulation and the detection packet with the message structure carrying measurement data of other type, select for survey crew; The different structure of message has determined that detection packet can measure the performance between different switch transmission paths in the whole network, can measure for certain specific virtual net again, can also measure for a certain specific transactions;
Timestamp operation: be responsible for detection packet and add timestamp at assigned address: transmitting terminal switch is according to the calculation of parameter time offset of the task of measurement, and add transmitting time for detection packet and stab; This time offset represents that different detection packet in the measurement sequence of each measurement task are with respect to the transmission time interval between first detection packet; Receiving terminal switch adds the detection packet receiving to arrive timestamp, represents the time of advent of this bag;
Data stuffing operation: according to measuring task parameters, be responsible for filling each field information of data division in detection packet, for show this detection packet task identification ID, measure every base attribute of type and measurement result;
Measurement message constructing operation: be responsible for extracting related data the report network controller in detection packet, receiving terminal switch completes after the processing of detection packet, this operation will be extracted measurement data from detection packet, and by these data encapsulation measuring in message, report to measurement assembly.
5. SDN network measuring system according to claim 1, is characterized in that: the function of three parts that the switch of described control able to programme is set up is as follows:
Programmable measurement operation storehouse, be positioned at exchange data passage, because existing bottom switch only supports more than ten to plant the basic operation that can not be used for network measure, for network enabled is measured, on bottom switch, expand and build this measurement operation storehouse, for storing the detection packet of carrying out network measure from constructing, send, be forwarded to the various operational orders of whole measuring process of reception; Concrete expansion mode is: directly arrange and multiplely shielded the details of heterogeneous networks Measurement Algorithm and make its basic operation instruction that possesses universality, and add in this programmable measurement operation storehouse; Or process flexibly dissimilar detection packet for making to exchange function, measurement assembly by control able to programme issues detection packet operational order code by OpenFlow agreement to switch, new measurement operation with software definition switch to detection packet, realizes and carries out measurement task in programming Control mode; Switch is using this section of instruction code as the extended operation to detection packet processing, and is stored in this programmable measurement operation storehouse; Once stream table, the match is successful, with regard to the corresponding operating of complete detection packet;
Programmable measurement module, is positioned at Switch control passage, because the bottom switch of existing SDN network can only be carried out setting operation, voluntarily construction data bag to the packet of flowing through according to the matching result of stream table; This programmable measurement module is responsible for resolving and is measured the task parameters and the operational order that carry in message, then with the construction process of the mode control detection packet of software definition; Relate to multiple basic operations that are endowed different priorities because constructing a complete detection packet, programmable measurement module is according to the different priorities of operation, carry out one by one according to operational order regulation order, finally complete the structure of each detection packet, and be stored in measurement queue; Wherein the priority of each operation also can be modified by the measurement assembly issuing message of control able to programme;
Measure queue management module, be positioned at exchange data passage, be in charge of the detection packet to be sent that self-defining surveying party lists; This measurement queue is constructed and detection packet to be sent for storing, then via the cyclic polling of this measurement queue management module, realizes the transmission on time of detection packet; Carry timestamp information because of each detection packet of measuring in queue, this measurement queue management module, as long as whether query time stamp is overtime, just can judge whether to send this detection packet; If desired, take out and transfer to data channel to process; Otherwise continue inquiry, until tail of the queue, to meet the requirement of measurement task to the time interval.
6. a method of measurement for the software defined network SDN measuring system of control able to programme, is characterized in that: described method comprises following operating procedure:
(1) the measurement assembly of control able to programme obtains measurement task, calls respective algorithms structure measurement message, for instructing the switch fabric detection packet of programmable control system according to task parameters;
(2) support to measure the adaptation module of assembly and obtain the measurement message that the measurement assembly of control able to programme issues and process, then transfer to network controller to be issued to the switch of corresponding control able to programme;
(3) switch of the control able to programme of transmitting terminal carries out the structure of detection packet according to task parameters, and is stored to measurement queue, then queue is measured in inquiry periodically, thereby overtime detection packet is sent in network;
(4) switch that forwards the control able to programme of end is processed detection packet according to the matching result of stream table, and forwards from corresponding port;
(5) switch of the control able to programme of receiving terminal carries out respective handling according to stream table matching result to the detection packet of receiving, extracts measurement of correlation data, and is encapsulated in to measure in message and reports;
(6) network controller is transferred to the measurement message of reception to support to measure the adaptation module of assembly, and this adaptation module is processed measuring message, then transfers to measure assembly;
(7) measurement data that the measurement component stores of control able to programme receives, has judged whether measurement task, and determines whether need measurement result to calculate and store according to judged result.
7. the method for measurement of SDN measuring system according to claim 6, is characterized in that: described step (1) comprises following content of operation:
(11) obtain task and resolve task parameters: the measurement assembly of control able to programme obtains after measurement task, first to measurement task comprise task ID and measure type related network measure basic parameter resolve so that this measurement assembly can select correct Measurement Algorithm to carry out network measure;
(12) structure is measured message, encapsulation task parameter and operational order: the measurement assembly of control able to programme is according to the specific requirement of Measurement Algorithm, fill each field of task parameters and add operational order, for the switch of control able to programme in structural exploration packet procedures, call corresponding measurement operation according to the regulation of operational order, carry out the structure of detection packet, and complete the filling of each field in detection packet according to task parameters, finally this measurement task is stored in Task-list.
8. the method for measurement of SDN measuring system according to claim 6, is characterized in that: described step (3) comprises following content of operation:
(31) resolve and measure message, obtain message content: the switch of transmitting terminal control able to programme judges according to the type of the OpenFlow protocol message receiving whether it is to measure message, if, transfer to programmable measurement module, carry out subsequent step (32), otherwise, finish this method of measurement flow process;
(32) structural exploration bag be stored to measurement queue: programmable measurement module is according to the operational order of measuring in message, judge the priority of each operation, and successively carry out corresponding operating according to priority height, complete the associative operation that message encapsulation, data stuffing and timestamp add, after complete detection packet of construction complete, be stored to and measured queue wait transmission;
(33) regularly queue is measured in inquiry, send detection packet: the switch of transmitting terminal control able to programme, in running, is measured queue management module cyclic polling and measured queue, checks the timestamp that detection packet is carried, and after comparing with the current system time, know whether detection packet needs to send; If need, detection packet transferred to data channel to carry out the coupling of stream table, and be sent to network from corresponding port; Otherwise, continue inquiry, until measure queue afterbody.
9. the method for measurement of SDN measuring system according to claim 6, is characterized in that: described step (5) comprises following content of operation:
(51) stream table coupling, determine whether detection packet: packet, being forwarded to after the switch of receiving terminal control able to programme, first carries out the coupling of stream table, determines whether detection packet, and whether the object switch ID that this bag carries is consistent with this switch ID; If so, according to matching result, carry out subsequent step (52); Otherwise, continue to forward;
(52) carry out corresponding operating, extracting measurement data also reports: the switch of receiving terminal control able to programme according to the result of stream table coupling to detection packet carry out comprise add arrive timestamp, extract measurement data, structure is measured message and encapsulate the series operation of measurement data, finally by this measurement information reporting to network controller.
10. the method for measurement of SDN measuring system according to claim 6, is characterized in that: described step (7) comprises following content of operation:
(71) resolve and measure message, obtain measurement data: the measurement assembly of control able to programme receives to be supported to measure after the measurement message that the adaptation module of assembly reports, extract the data in this measurement message, and the measurement data of this extraction is stored in to corresponding task node in Task-list;
(72) calculating and stores it: whether have completed task in the measurement component inspection Task-list of control able to programme, if had, from chained list, take out this task, call corresponding Measurement Algorithm according to task parameters, the measurement data of being extracted according to step (71) by Measurement Algorithm again completes the calculating of measurement result, and shows and stores it to survey crew; If no, finish whole flow processs.
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