CN106850803A - A kind of WRR system and algorithm based on SDN - Google Patents
A kind of WRR system and algorithm based on SDN Download PDFInfo
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- CN106850803A CN106850803A CN201710065812.8A CN201710065812A CN106850803A CN 106850803 A CN106850803 A CN 106850803A CN 201710065812 A CN201710065812 A CN 201710065812A CN 106850803 A CN106850803 A CN 106850803A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1029—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers using data related to the state of servers by a load balancer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
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Abstract
WRR system and algorithm the present invention relates to be based on SDN.Present system includes that client modules are asked for sending client；Server module, for receiving and processes client's request that the client modules send；SDN switch module, for server module described in dynamic detection, and reports SDN controller modules by testing result；SDN controller modules, testing result for being reported according to the SDN switch module generates WRR Policy Table, and according to the WRR Policy Table for the client of the client modules asks distribution server, and flow table is issued to the SDN switch module according to server-assignment result.The all of configuration of the present invention all concentrates on controller, and SDN switch can be with automatic sensing server and notification controller, configuration is conveniently simple, it is uniformly controlled by controller, controller formulates WRR strategy according to the server info for reporting, and flow table is issued, so as to realize load balancing function.
Description
Technical field
The present invention relates to mobile communication technology field, specially a kind of WRR system and algorithm based on SDN.
Background technology
Software defined network (SoftwareDefinedNetwork, SDN), is a kind of new network innovation of Emulex networks
Framework, is a kind of implementation of network virtualization, and its core technology OpenFlow is by by network equipment chain of command and data
Face separates, it is achieved thereby that the flexible control of network traffics, makes network become more intelligent as pipeline.Traditional IT architecture
In network, according to business demand deployment reach the standard grade after, if business demand changes, remodify corresponding network equipment
Configuration on (router, interchanger, fire wall) is a very cumbersome thing.In internet/mobile Internet instant ten thousand
Under the service environment of change, high stable and the high-performance of network are also insufficient for business demand, and flexibility and agility are all the better
It is key.The thing that SDN is done is to separate the control on the network equipment, by the controller management concentrated, without dependence
Underlay network device (router, interchanger, fire wall), shields the difference from underlay network device.And control has been
Full-open, user can be with self-defined any network route for wanting to realize and transmission rule strategy, so that more flexibly and intelligent.
SDN is the representative of next generation IP network network management framework design, and this thinking is emphasized to split control plane and forwarding
Face, with " stream is exchanged " replacement " bag conversion ", is replaced with " centralized management " and is separately configured.OpenFlow is then to realize this thinking
When, with the flow table of network central management platform, (FlowTable, more general word is NIB, i.e.,
NetworkInformationBase) the agreement of substitution network equipment routing table (RIB, RoutingInformationBase).
SDN includes SDNController (SDN controllers) and SDN switch.SDN controllers are software defined networks
Application program in network (SDN), is responsible for flow control to ensure intelligent network.SDN controllers are based on such as OpenFlow associations
View, it is allowed to which server tells interchanger to where sending packet.SDN controllers are the control centres of whole SDN,
By OpenFlow agreements, issue various flow tables by SDN controllers carries out message forwarding to SDN switch.In SDN, branch
The SDN interaction machines for holding OpenFlow carry out business forwarding by flow table, and the flow table in SDN interaction machines is that SDN controllers are generated simultaneously
One rule is handed down to SDN interaction machines.
With flowing of access rapid growth, portfolio is improved constantly, and server is often operated in overload state, therefore uses
Family cannot obtain uninterrupted availability and faster SRT.Existing solution is, by load-balancing technique, to pass
The load balancing of system is concentrated in a load-balancing device, and load-balancing device is responsible for user according to configured balance policy
Request is distributed in server farm.And Control granularity is what the port based on load-balancing device was set so that Control granularity
It is excessive, and whole configuration is distributed (whole network has many load-balancing devices), configuration complexity and easily error.And
When customer service is a lot, SDN controllers can generate a large amount of flow table items, by OpenFlow agreements flow table issuance mechanism in itself,
The flow table speed for configuring SDN switch is slow, therefore generation flow table is a lot, and flow table issuance speed is slow, causes business to be given birth to completely
The effect time can be very long, influences Consumer's Experience.
The content of the invention
The problem that the present invention exists for prior art, it is proposed that a kind of WRR system and algorithm based on SDN, institute
Some configurations all concentrate on controller, and SDN switch can be with automatic sensing server and notification controller, configuration convenience
Simply, it is uniformly controlled by controller, controller formulates WRR strategy according to the server info for reporting, and issues flow table,
So as to realize load balancing function.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of WRR system based on SDN, including：
Client modules, for sending client's request；
Server module, for receiving and processes client's request that the client modules send；
SDN switch module, for server module described in dynamic detection, and reports SDN controllers by testing result
Module；
SDN controller modules, the testing result for being reported according to the SDN switch module generates WRR strategy
Table, and according to the WRR Policy Table for the client of the client modules asks distribution server, and according to service
Device allocation result issues flow table to the SDN switch module.
Preferably, the SDN switch module includes：
PING packet sending units, for sending PING messages to obtain the IP address of active server to interface；
FTP request message structural units, ftp server address is enlivened obtaining for constructing FTP request messages；
HTTP request message structural unit, WEB server address is enlivened obtaining for constructing HTTP request message；
Message reporting unit, for by the PING packet sending units, the FTP request messages structural unit and described
The server info that HTTP request message structural unit is obtained reports the SDN controllers in Experimenter message forms
Module.
Preferably, the SDN controller modules include：
Message receiving unit, for receiving the Experimenter messages that the SDN switch module is reported；
Packet parsing unit, for parsing the Experimenter messages of the message receiving unit reception to obtain service
Device information；
WRR Policy Table's generation unit, for the server info generation weighting wheel obtained according to packet parsing unit
Ask Policy Table；
Server-assignment unit, weight and access times for obtaining each server according to WRR Policy Table,
And according to the weight and access times of each server for respective server distributes client；
Flow table issuance unit, for calculating forward-path according to the server-assignment result of the server-assignment unit,
And flow table is issued to the SDN switch module according to the forward-path.
Preferably, the SDN controller modules also include：
Threshold setting unit, the threshold value for setting flow table item；
Threshold test is detected, is connected with the threshold setting unit, for detecting the flow table item that the SDN controllers are generated
Quantity whether exceed default threshold value；
Stream file unit, is connected with the threshold detection unit, the number of the flow table item for being generated in the SDN controllers
Stream file of the generation comprising flow table item when amount is more than default threshold value；
Flow table information transmitting unit, is connected with the stream file unit, for being sent comprising described to the SDN switch
The flow table message of stream file information.
Preferably, also including in the SDN controllers：
Feedback information receiving unit, for judge to be had been received by Preset Time the SDN switch feedback for true
Recognize the feedback information for having obtained flow table item and having issued flow table.
A kind of Weighted Round Robin of use said system, comprises the following steps：
1) client is sent by client modules to ask；
2) by SDN switch module dynamic detection server module, and testing result is reported into SDN controller moulds
Block；
3) testing result reported according to the SDN switch module by SDN controller modules generates WRR plan
Sketch form, and according to the WRR Policy Table for the client of the client modules asks distribution server, and according to clothes
Business device allocation result issues flow table to the SDN switch module；
4) client's request that the client modules send is received and processed by server module.
Preferably, the step 2) specifically include：
21) PING messages are sent to obtain the IP address of active server to interface by PING packet sending units；
22) FTP request messages are constructed by FTP request messages structural unit and enlivens ftp server address to obtain；
23) HTTP request message is constructed by HTTP request message structural unit and enlivens WEB server address to obtain；
24) by message reporting unit by the PING packet sending units, the FTP request messages structural unit and institute
State the server info of HTTP request message structural unit acquisition and report the SDN controls in Experimenter message forms
Device module.
Preferably, the step 3) specifically include：
31) the Experimenter messages that the SDN switch module is reported are received by message receiving unit；
32) the Experimenter messages for being received by message receiving unit described in packet parsing unit resolves are obtaining clothes
Business device information；
33) server info obtained according to packet parsing unit by WRR Policy Table generation unit generates weighting
Polling schemas table；
34) weight of each server is obtained and using secondary according to WRR Policy Table by server-assignment unit
Number, and be that respective server distributes client according to the weight and access times of each server；
35) forwarding road is calculated according to the server-assignment result of the server-assignment unit by flow table issuance unit
Footpath, and flow table is issued to the SDN switch module according to the forward-path.
Preferably, the Weighted Round Robin of the SDN controllers is further comprising the steps of：
41) threshold value of flow table item is set by threshold setting unit；
42) detect the quantity of the flow table item that the SDN controllers are generated whether more than default by threshold detection unit
Threshold value；
43) it is used to exceed default threshold value in the quantity of the flow table item of SDN controllers generation by stream file unit
Stream files of the Shi Shengcheng comprising the flow table item；
44) flow table comprising the stream file information is sent to the SDN switch by flow table information transmitting unit to disappear
Breath.
Preferably, the Weighted Round Robin of the SDN controllers is further comprising the steps of：
Judge to be had been received by Preset Time that the SDN switch feeds back for confirming by feedback information receiving unit
Obtain flow table item and issue the feedback information of flow table；
When the feedback information of the SDN switch feedback is not received in Preset Time, the flow table issuance unit is to institute
State SDN switch and issue the flow table comprising the flow table item.
The beneficial effects of the invention are as follows:
Based on SDN frameworks, the strategy of WRR is based on whole network, there is provided service end to end, SDN switch possesses
The function of timing aware services device, and SDN controllers are reported by Experimenter messages, controller is according to the clothes for reporting
Business device information formulates WRR strategy, and issues flow table, so as to realize load balancing function.
Brief description of the drawings
Fig. 1 is the structural representation of WRR system of the present invention based on SDN；
Fig. 2 is the schematic diagram of Weighted Round Robin of the present invention based on SDN；
Fig. 3 is the general flow chart of Weighted Round Robin of the present invention based on SDN；
Fig. 4 is the handling process schematic diagram of SDN switch module of the present invention；
Fig. 5 is the handling process schematic diagram of SDN controller modules of the present invention；
Fig. 6 is the WRR schematic diagram of SDN controller modules of the present invention.
Specific embodiment
The following is specific embodiment of the invention and with reference to accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in Figure 1-2, a kind of WRR system based on SDN, including：
Client modules, for sending client's request, including some client devices.
Server module, for receiving and processes client's request that the client modules send.Including some servers,
Multiple servers constitute a group, and they are connected by the network equipment, and these servers provide same or analogous network
Service.
As shown in figure 4, SDN switch module, for server module described in dynamic detection, and testing result is reported
SDN controller modules.The SDN switch module includes, PING packet sending units, for interface send PING messages with
Obtain the IP address of active server；FTP request message structural units, for construct FTP request messages with obtain enliven FTP take
Business device address；HTTP request message structural unit, WEB server address is enlivened obtaining for constructing HTTP request message；Report
Literary reporting unit, for by the PING packet sending units, the FTP request messages structural unit and the HTTP request report
The server info that literary structural unit is obtained reports the SDN controller modules in Experimenter message forms.
As seen in figs. 5-6, SDN controller modules, the testing result for being reported according to the SDN switch module is generated
WRR Policy Table, and according to the WRR Policy Table for the client of the client modules asks distribution server,
And flow table is issued to the SDN switch module according to server-assignment result.By controller aware services device group, root
According to the strategy of WRR, the distribution by user's request in server farm provides the user service, and available to server
Property is safeguarded.The strategy of WRR is based on whole network, there is provided service end to end, and SDN switch possesses timing and perceives
The function of server, and SDN controllers are reported by Experimenter messages, controller is according to the server info for reporting
WRR strategy is formulated, and issues flow table, so as to realize load balancing function.
Controller should support the control plane hardware current limliting configuration task sequence based on SDN, should include：Control based on SDN
Plane hardware current-limiting function processed is opened or closed, hardware current limliting Policy Table.Configuration item includes the WRR function based on SDN,
For opening or closing WRR function and WRR Policy Table based on SDN, WRR Policy Table is by reporting
Experimenter messages are created, can be by the static modification configuration of user.
The field of Experimenter messages includes server ip address, this field definition server ip address；Server
Type, this field definition type of server, 1 is ftp server, and 2 is WEB server；Interchanger ID, this field specifies connection clothes
The interchanger ID of business device；Switch ports themselves, this field specifies the port of the interchanger of connection server；Weight, this field is specified
The weight of server；Access times, the number of times that this field given server is used.
From the form of the privately owned extension Experimenter messages of SDN switch module to SDN controller modules,
Experimenter values are needed to organize application to ONF for 255, and Experimenter type values are shown to be from SDN switch for 1
To controller direction.After server detection terminates, privately owned extension Experimenter messages report control by SDN switch
Device processed.Wherein server info includes:Server ip address and type of server.
The SDN controller modules include, message receiving unit, for receiving what the SDN switch module was reported
Experimenter messages；Packet parsing unit, for parsing the Experimenter messages that the message receiving unit is received
To obtain server info；WRR Policy Table's generation unit, for the server info obtained according to packet parsing unit
Generation WRR Policy Table；Server-assignment unit, the weight for obtaining each server according to WRR Policy Table
And access times, and be that respective server distributes client according to the weight and access times of each server；Flow table issuance list
Unit, for calculating forward-path according to the server-assignment result of the server-assignment unit, and according to the forward-path
Flow table is issued to the SDN switch module.
When customer service is a lot, SDN controller modules can generate a large amount of flow table items, by OpenFlow agreements in itself
Flow table issuance mechanism, the flow table speed for configuring SDN switch module is slow, therefore generation flow table is a lot, flow table issuance speed
Slowly, cause the business complete entry-into-force time can be very long, influence Consumer's Experience.Therefore, the SDN controller modules also include, threshold value
Setting unit, the threshold value for setting flow table item, the threshold value of flow table item can be set according to offered load ability, network speed etc.
It is fixed.Flow table is issued to SDN switch module by SDN controller modules, the allocative efficiency of server is further increased.
Threshold test is detected, is connected with the threshold setting unit, for detecting the flow table item that the SDN controllers are generated
Quantity whether exceed default threshold value.When the quantity of flow table item is not above threshold value, SDN controller modules continue with tradition
Flow table issuance mode is to SDN switch module, i.e. SDN controller modules generation flow table and a rule is handed down to SDN switch mould
Block.When the quantity of the flow table item of SDN controller modules generation exceedes the threshold value of default flow table item, then the stream file unit life
Into the stream file comprising the flow table item.
Stream file unit, is connected with the threshold detection unit, the number of the flow table item for being generated in the SDN controllers
Stream file of the generation comprising flow table item when amount is more than default threshold value.Flow table information transmitting unit, with the stream file list
Unit is connected, for sending the flow table message comprising the stream file information to the SDN switch.The flow table is included in generation
After the stream file of item, the flow table information transmitting unit sends the flow table comprising the stream file information to the SDN switch
Message, wherein at least including the title of stream file mark and stream file in the flow table information.
The SDN switch module is also included：Flow table information receiving unit, flow table item acquiring unit and configuration distributing list
Unit.The flow table information receiving unit is used to receive the flow table message comprising stream file information from SDN controller modules；The stream
List item acquiring unit is connected with the flow table information receiving unit, for according to the flow table message that receives with default net
Network access mode obtains the flow table item in the stream file from the SDN controller modules.
Additionally, after the flow table message comprising the stream file information is sent to the SDN switch module, to ensure
SDN switch module has obtained the flow table item in stream file, and the SDN controller modules send one and inquire that message inquiry is described
Whether SDN switch module has obtained the flow table item in stream file.Therefore, also included in the SDN switch module：Feedback
Information transmitting unit, is connected with the configuration distributing unit, for being sent for confirming to have obtained to the SDN controller modules
Flow table item has simultaneously issued the feedback information of flow table.Also include in the SDN controllers, feedback information receiving unit, for judging
Having obtained flow table item for confirmation and having issued the feedback letter of flow table for the SDN switch feedback is had been received by Preset Time
Breath.When feedback information receiving unit does not receive the feedback information of the SDN interactions machine feedback in Preset Time, under the flow table
Bill unit issues the flow table comprising the flow table item to the SDN switch module.That is, the feedback information receives single
Unit does not receive having obtained flow table item for confirmation and having issued stream for the feedback information transmitting element feedback in Preset Time
During the feedback information of table, SDN controller modules continue with traditional flow table issuance mode to SDN switch module, i.e. SDN controllers
Simultaneously a rule is handed down to SDN switch module to module generation flow table.
As shown in figure 3, a kind of Weighted Round Robin, it is comprised the following steps：
1) client is sent by client modules to ask；
2) by SDN switch module dynamic detection server module, and testing result is reported into SDN controller moulds
Block.The step 2) specifically include, 21) PING messages are sent to obtain active service to interface by PING packet sending units
The IP address of device；22) FTP request messages are constructed by FTP request messages structural unit and enlivens ftp server address to obtain；
23) HTTP request message is constructed by HTTP request message structural unit and enlivens WEB server address to obtain；24) by report
Literary reporting unit is by the PING packet sending units, the FTP request messages structural unit and the HTTP request message structure
The server info for making unit acquisition reports the SDN controller modules in Experimenter message forms.
3) testing result reported according to the SDN switch module by SDN controller modules generates WRR plan
Sketch form, and according to the WRR Policy Table for the client of the client modules asks distribution server, and according to clothes
Business device allocation result issues flow table to the SDN switch module.
The step 3) specifically include, 31) receive what the SDN switch module was reported by message receiving unit
Experimenter messages；32) Experimenter received by message receiving unit described in packet parsing unit resolves is reported
Text is obtaining server info；33) server obtained according to packet parsing unit by WRR Policy Table generation unit
Information generates WRR Policy Table；34) each server is obtained according to WRR Policy Table by server-assignment unit
Weight and access times, and according to the weight and access times of each server be respective server distribute client；35) lead to
Cross flow table issuance unit and forward-path is calculated according to the server-assignment result of the server-assignment unit, and according to described turn
Hair path issues flow table to the SDN switch module.
4) client's request that the client modules send is received and processed by server module.
The Weighted Round Robin of the SDN controllers is further comprising the steps of, and 41) flow table is set by threshold setting unit
The threshold value of item；42) detect the quantity of the flow table item that the SDN controllers are generated whether more than default by threshold detection unit
Threshold value；43) it is used to be given birth to when the quantity of the flow table item of SDN controllers generation exceedes default threshold value by stream file unit
Into the stream file comprising the flow table item；44) sent to the SDN switch by flow table information transmitting unit and include the stream
The flow table message of fileinfo.
The Weighted Round Robin of the SDN controllers is further comprising the steps of, is judged by feedback information receiving unit
Having obtained flow table item for confirmation and having issued the feedback letter of flow table for the SDN switch feedback is had been received by Preset Time
Breath；When the feedback information of the SDN switch feedback is not received in Preset Time, the flow table issuance unit is to the SDN
Interchanger issues the flow table comprising the flow table item.That is, the SDN controller modules do not receive institute in Preset Time
State when having obtained flow table item and issued the feedback information of flow table for confirmation of SDN switch module feedback, SDN controller moulds
Block continues with traditional flow table issuance mode to SDN switch module, i.e. SDN controller modules generation flow table and a rule is handed down to
SDN switch module.
SDN controller modules are responsible for whole SDN (Software Defined Network, software defined network)
Centralization control, there is very important effect for holding the whole network resource view, improving Internet resources delivery quality.It is single
Controller cannot tackle SDN problem across multiple regions；The distributed type assemblies of many motors control device formation are needed, is kept away
Exempt from the problem of the aspects such as reliability, autgmentability, performance that single controller node is caused.
Therefore, the SDN switch module also includes communications processor element, and the SDN controller modules include：First
SDN controllers, at least one the 2nd SDN controllers and configuration management element.The first SDN controllers, for described
The communications processor element of SDN switch module sets up main connection；The 2nd SDN controllers, for the SDN switch mould
The communications processor element of block sets up auxiliary connection；The configuration management element, in the case of the main Joint failure, in institute
State the new main connection selected in each described auxiliary connection of SDN switch module.The SDN controllers of the new main connection connect with old master
Data syn-chronization is kept between the SDN controllers for connecing, is lost activity in the SDN controller modules and (is for example broken down and make main company
Connect failure) the load of SDN controllers distribution to other active SDN controls is averaged according to default Load Sharing Algorithm
Device processed.
In order that SDN switch module can switch to new main connection from old master's connection, the SDN switch module and
Need the presence of corresponding communication interaction between SDN controller modules.Specifically, the configuration management element the SDN exchange
The new main connection selected in each described auxiliary connection of machine module, including：Receive comprising the SDN switch MAC Address first
Experimenter messages, and calculated each to determine according to the IP address and the MAC Address of the SDN controller modules
The connection type of SDN controllers and the SDN switch module, the connection type is the main connection or auxiliary connection, then,
The 2nd Experimenter messages are sent to the SDN switch module, each described 2nd Experimenter message is included
The IP address and connection type of a SDN controller in the SDN controller modules.
Synchronization between the SDN controllers is divided into real-time synchronization and cycle synchronisation, and real-time synchronization is increment synchronization, causes reality
When synchronous factor include at 4 points：Statistical information change, composer change, north orientation application change and the change of OF message etc.；Cycle
It is synchronously the synchronization of full database, due to spending the time more long, answers background process.Except connection state information, each SDN controls
Data content in the database of device can keep completely the same.
Specific embodiment described herein is only to the spiritual explanation for example of the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from spirit of the invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of WRR system based on SDN, it is characterised in that：Including,
Client modules, for sending client's request；
Server module, for receiving and processes client's request that the client modules send；
SDN switch module, for server module described in dynamic detection, and reports SDN controller modules by testing result；
SDN controller modules, the testing result for being reported according to the SDN switch module generates WRR Policy Table,
And according to the WRR Policy Table for the client of the client modules asks distribution server, and according to server point
With result flow table is issued to the SDN switch module.
2. a kind of WRR system based on SDN according to claim 1, it is characterised in that：The SDN switch mould
Block includes,
PING packet sending units, for sending PING messages to obtain the IP address of active server to interface；
FTP request message structural units, ftp server address is enlivened obtaining for constructing FTP request messages；
HTTP request message structural unit, WEB server address is enlivened obtaining for constructing HTTP request message；
Message reporting unit, for by the PING packet sending units, the FTP request messages structural unit and the HTTP
The server info that request message structural unit is obtained reports the SDN controllers mould in Experimenter message forms
Block.
3. a kind of WRR system based on SDN according to claim 1, it is characterised in that：The SDN controllers mould
Block includes,
Message receiving unit, for receiving the Experimenter messages that the SDN switch module is reported；
Packet parsing unit, is believed for parsing the Experimenter messages that the message receiving unit is received with obtaining server
Breath；
WRR Policy Table's generation unit, the server info for being obtained according to packet parsing unit generates WRR plan
Sketch form；
Server-assignment unit, weight and access times for obtaining each server according to WRR Policy Table, and root
According to the weight and access times of each server for respective server distributes client；
Flow table issuance unit, for calculating forward-path, and root according to the server-assignment result of the server-assignment unit
According to the forward-path flow table is issued to the SDN switch module.
4. a kind of WRR system based on SDN according to claim 3, it is characterised in that：The SDN controllers mould
Block also includes,
Threshold setting unit, the threshold value for setting flow table item；
Threshold test detection, is connected with the threshold setting unit, the number of the flow table item for detecting the SDN controllers generation
Whether amount exceedes default threshold value；
Stream file unit, is connected with the threshold detection unit, and the quantity of the flow table item for being generated in the SDN controllers surpasses
Stream file of the generation comprising flow table item when crossing default threshold value；
Flow table information transmitting unit, is connected with the stream file unit, for being sent comprising the stream text to the SDN switch
The flow table message of part information.
5. a kind of WRR system based on SDN according to claim 4, it is characterised in that：In the SDN controllers
Also include,
Feedback information receiving unit, for judge to be had been received by Preset Time the SDN switch feedback for confirming
Obtain flow table item and issue the feedback information of flow table.
6. in a kind of use claim 1-5 any system Weighted Round Robin, it is characterised in that：Comprise the following steps,
1) client is sent by client modules to ask；
2) by SDN switch module dynamic detection server module, and testing result is reported into SDN controller modules；
3) testing result reported according to the SDN switch module by SDN controller modules generates WRR Policy Table,
And according to the WRR Policy Table for the client of the client modules asks distribution server, and according to server point
With result flow table is issued to the SDN switch module；
4) client's request that the client modules send is received and processed by server module.
7. Weighted Round Robin according to claim 6, it is characterised in that：The step 2) specifically include,
21) PING messages are sent to obtain the IP address of active server to interface by PING packet sending units；
22) FTP request messages are constructed by FTP request messages structural unit and enlivens ftp server address to obtain；
23) HTTP request message is constructed by HTTP request message structural unit and enlivens WEB server address to obtain；
24) by message reporting unit by the PING packet sending units, the FTP request messages structural unit and described
The server info that HTTP request message structural unit is obtained reports the SDN controllers in Experimenter message forms
Module.
8. Weighted Round Robin according to claim 6, it is characterised in that：The step 3) specifically include,
31) the Experimenter messages that the SDN switch module is reported are received by message receiving unit；
32) the Experimenter messages for being received by message receiving unit described in packet parsing unit resolves are obtaining server
Information；
33) server info obtained according to packet parsing unit by WRR Policy Table generation unit generates WRR
Policy Table；
34) weight and access times of each server are obtained according to WRR Policy Table by server-assignment unit, and
Weight and access times according to each server are respective server distribution client；
35) forward-path is calculated according to the server-assignment result of the server-assignment unit by flow table issuance unit, and
Flow table is issued to the SDN switch module according to the forward-path.
9. Weighted Round Robin according to claim 8, it is characterised in that：The Weighted Round Robin of the SDN controllers
It is further comprising the steps of,
41) threshold value of flow table item is set by threshold setting unit；
42) whether the quantity for detecting the flow table item that the SDN controllers are generated by threshold detection unit exceedes default threshold value；
43) it is used to be given birth to when the quantity of the flow table item of SDN controllers generation exceedes default threshold value by stream file unit
Into the stream file comprising the flow table item；
44) the flow table message comprising the stream file information is sent to the SDN switch by flow table information transmitting unit.
10. Weighted Round Robin according to claim 9, it is characterised in that：The Weighted Round Robin of the SDN controllers
It is further comprising the steps of,
Judge to have been received by having been obtained for confirmation for the SDN switch feedback in Preset Time by feedback information receiving unit
Take flow table item and issue the feedback information of flow table；
When the feedback information of the SDN switch feedback is not received in Preset Time, the flow table issuance unit is to the SDN
Interchanger issues the flow table comprising the flow table item.
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