CN103236944A - QoS (quality of service) integrated management system based on OpenFlow network - Google Patents
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Abstract
The invention discloses a QoS (quality of service) integrated management system based on an OpenFlow network, and belongs to the technical field of OpenFlow network design. The QoS integrated management system comprises an OpenFlow switch and a control node. The OpenFlow switch comprises a DiffServ model function component and a control proxy component which are connected sequentially. The DiffServ model function component is used for performing standard QoS control of data reaching the node where the OpenFlow switch is located, and the control proxy component is used for performing read/write operations to parameters of the DiffServ model function component. The control node comprises a command configuration component and a control management component. The command configuration component is used for receiving commands sent by an administrator, and the control management component is used for packaging and transmitting commands sent by the administrator according to a protocol format. The QoS integrated management in the OpenFlow network environment is realized.
Description
Technical field
The invention belongs to OpenFlow network design technical field, relate in particular to a kind of QoS centralized management system based on the OpenFlow network.
Background technology
OpenFlow server thought be with the transmission of network with control two major functions and separate, respectively by the transmission node in the network, i.e. OpenFlow switch, and the control node in the network, namely core controller is realized.When the transmission characteristic that the demand of transmission new business or network occur when network need change, the manager only need revise functions of control program logic on the belonging network core controller, and need not to pay close attention to or change the network that the bottom transmission node is formed fully.OpenFlow has increased flexibility and the extensibility of network management.The research of at present relevant OpenFlow network progressively launches, and relates to some key technologies in traditional the Internet, guarantees (QOS) and traffic engineering etc. such as IP route, service quality.
Network characteristic as user's care, the service quality assurance technology of network transmission is through years of researches and development, formed some technical comparatively ripe industrywide standards, wherein differentiated service (DiffServ) realizes that with it characteristics simple, that extensibility is strong have obtained approving widely and using in current commercial network.Because DiffServ mechanism is distinguished the kind of function node in the territory, a kind of efficient and rational DiffServ administrative mechanism is to guarantee the important means of DiffServ operational efficiency.Therefore proposing a kind of practicable Governance framework at DiffServ mechanism, is one of direction of future studies.
Summary of the invention
The objective of the invention is to, design the centralized management system under the OpenFlow network environment, it can bookkeeping such as monitor and reshuffle to the DiffServ functional unit of Softrouter open source software exploitation on the bottom transmission node.
To achieve these goals, the technical scheme that the present invention proposes is, a kind of QoS centralized management system based on the OpenFlow network, comprise OpenFlow switch and control node, it is characterized in that described OpenFlow switch comprises differentiated service functional unit and the control agent assembly that is linked in sequence, described differentiated service functional unit is used for the data of the node that arrives OpenFlow switch place are carried out standard QoS control, comprise data are carried out traffic classification successively, measure, mark, queue management and queue scheduling are handled, and described control agent assembly is for read/write operation that the parameter of differentiated service functional unit is correlated with; Described control node comprises command configuration assembly and the control and management assembly that is linked in sequence, described command configuration assembly is used for the instruction that receiving management person sends, and described control and management assembly is used for according to setting protocol format with the instruction encapsulation of keeper's transmission and transmitting.
The present invention has realized the QoS centralized management under the OpenFlow network environment.
Description of drawings
Fig. 1 is that the OpenFlow controller is by escape way control OpenFlow switch figure;
Fig. 2 is based on the QoS centralized management system general frame figure of OpenFlow network;
Fig. 3 is based on the QoS centralized management system functional block diagram of OpenFlow network;
Fig. 4 is management system functional unit interaction diagrams;
Fig. 5 is Click module connection layout.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
1, analyzes and Frame Design based on the QoS centralized management system of OpenFlow network
(1) OpenFlow network overview
In the OpenFlow network model, the low layer transmission node is a kind of special Ethernet switch that is different from the legacy network node.Switch is safeguarded the stream table of an inside, and the interface by standard to its add, operations such as modification and deletion.The OpenFlow network configuration is by the forwarding node of bottom, i.e. the forwarding node controller of OpenFlow switch, and top layer, and namely Controller forms.
Communicating by letter of switch and controller adopts the OpenFlow agreement to carry out in the OpenFlow network.When OpenFlow agreement regulation switch and controller intercommunication control information, should carry out the biography of message based on research and the realization of the QoS centralized management system of OpenFlow network by reliable transmission safety passage.As shown in Figure 1.Control information comprises that handshake information, switch configuration message, status modification message, formation configuration messages, state read message etc.Control message mainly realizes the grouping that switch is uploaded data flow to controller, and controller issues operations such as stream table to switch.
(2) differentiated service (DiffServ)
DiffServ adopts the thought of class polymerization, grade of service contract (SLA) according to ISP and user's as offered, the multiple user traffic flow that has the same services grade is carried out converging of class of service, and according to each different priorities that converges the class representative, provide the relative service quality of hop-by-hop to guarantee.The network of DiffServ architecture embodies a network of being made up of Differentiated Services district (DS district), can comprise one or more different service domains (DS territory) in each DS district again, and each DS territory then provides the minimum unit of complete DiffServ function.Comprise the Differentiated Services node of dividing according to the present position (DS node) in the DS territory, comprise DS edge nodes and DS obs network node.Edge nodes in the DiffServ standard recommendation DS territory provides complicated stream of packets processing capacity, comprise to stream of packets classify, the function of concrete mechanism such as measurement, mark and adjusting, assorting process and intserv model by traffic classification and inequality, but adopt Business Stream is carried out the classification of converging such as five-tuple according to packet header information, different classes of Business Stream can obtain to enjoy the different priority of Internet resources.
(3) QoS management system
Network QoS management is the part of network management, and it to the effect that plans the network Limited resources, as management and the distribution of network bandwidth resources, and the control of queue resource management and scheduling feature etc. on the forwarding node.According to the difference of administrative model structure, the QoS administrative mechanism can be divided into centralized and the distributed management model.In traditional IP network management system, occupy critical role based on the management method of strategy.To manage with carrying out by policy mechanism and to separate, and deposit the strategy that defines in the strategic memory pool, network entity automatically performs pre-seting of task according to these strategies.With respect to the legacy network way to manage, have advantages such as uniformity, abstractness and adaptivity based on the management method of strategy based on the QoS management system of strategy, thereby obtain deep research and use widely.
(4) the OpenFlow network is divided into following a few class by function: network connectivty, network service quality guarantee, network traffics are controlled, the network burst.
(5) the OpenFlow network of Ti Chuing concentrates the QoS management system need finish following target:
1) Frame Design of differentiated service (DiffServ) under the OpenFlow network;
2) realization mechanism of DiffServ model functional unit;
3) under the OpenFlow network based on the Frame Design of the QoS management system of DiffServ model;
4) realization mechanism of QoS management system.
Final goal based on the centralized QoS management system of OpenFlow network is to realize a such OpenFlow network management system.It can be on the hybrid network of OpenFlow SoftSwitch and traditional routing device composition, according to experiment predetermined quality of service classification, the service quality assurance of traditional DiffServ standard definition is provided for the related service of this network of flowing through, and by OpenFlow controller and QoS core controller, each functional unit of DiffServ of realizing on the junction associated is managed and controls.
(6) system framework design
Need data stream be carried out correctly, effectively in the transmission, provide real-time monitoring and the regulatory function of QoS correlation function assembly satisfying the DiffServ standard feature based on the QoS management system of OpenFlow network.Monitoring and the objectives of regulating are carried out the input of corresponding strategies by application program for the information input interface that the system manager provides.The hierarchical model of whole management system as shown in Figure 2.
The edge of management system is Connection Service supplier and user respectively, and whole network is responsible for the Business Stream that the ISP submits to the user is realized the function of transmission and control.Management system is based on the OpenFlow network, can be divided into data transfer layer, control and management layer and command configuration layer according to functional hierarchy is bottom-up, the system manager is responsible for issuing related management instruction or control strategy to management system as the guardian of management system operation.
2, the QoS centralized management system function based on the OpenFlow network designs and realization
Management system need provide standard DiffServ service quality to guarantee ability for the transmission of user data, and the mode by centralized management realizes management and the control to the DiffServ associated component simultaneously.According to the difference that realizes function, the integral module of management system can be divided into DiffServ functional unit, control agent assembly, control and management assembly and four functional modules of command configuration assembly, and their deployment scenario on each entity of management system as shown in Figure 2.
Be in the datum plane of system among the figure except the DiffServ functional unit, other modules all then are in the control plane of system.The former function is that the data of system transmissions are carried out certain processing; The latter is the direct data of processing service flow not then, but carry out configuration and the transmission of control information.Transmission node is represented bottom OpenFlow SoftSwitch node, and the functional module that comprises has DiffServ functional unit and control agent assembly, realizes the data that arrive this node are carried out the function that standard DiffServ handles.Simultaneously, the control message that obtains by the control agent analyzing component is to the read/write operation of being correlated with of the parameter of relevant DiffServ functional unit; The control node is represented QoS controller node, comprises being responsible for receiving management person's designated command configuration component, and the responsible control and management assembly that above-mentioned information is encapsulated and transmits according to certain protocol format.The control node encapsulates the transport layer udp protocol of the instruction by keeper input by traditional the Internet, makes it to become relevant control information, and by carrying out the transmission of message with the control channel of transmission node.
The systemic-function detailed design
(1) DiffServ standard feature
Edge nodes at OpenFlow SoftSwitch place is carried out QoS control according to the standard logarithmic of DiffServ framework according to stream, and data flow is carried out processing such as traffic classification, measurement and mark, queue management and queue scheduling successively.
(2) system management function
DiffServ mechanism realizes because the QoS management system is based on, and the management function of system must be able to be supported the read/write operation to the DiffServ functional unit.The major function of management system support has: l) by the initialization of management QoS node; 2) mutual by the read-write of management node DiffServ functional unit; 3) management information feedback; 4) information presentation system.
(3) management system interaction flow
Node is divided into control node and controlled node two classes according to function in the management system, and two class nodes are inner and need carry out the mutual and transmission of message according to certain flow process between them.
Interaction flow is that whole management system is finished the data flow operative norm DiffServ classification, measurement and mark, queue management and the queue scheduling that arrive controlled node and carried out reading and management function such as rewriting of relevant DiffServ component parameter between node.
Interaction flow between five functional units of system is as shown in Figure 4:
(4) realization mechanism of system
1) Click modular router
The Click software platform runs on the operating system of normal hosts, and by rationally connecting between the standalone module with sub-function moduleization, the data that Click makes current main frame have similar hardware router or switch are handled and control ability.Each independently functional module be called assembly, realize carrying out in logic independently processing capacity to arriving packet.The various processing data packets functions that DS node in the DiffServ model provides can adopt independent Click assembly to realize, according to the standard of RFC document specifies, the research staff can write the Click script of describing module annexation.The configuration parameter of these assemblies of script describing and annexation, thus make current main frame that complete DS node function is provided.
The port attribute of Click module is divided three classes, be push, pull and agnostic, push represents will initiatively send packet to the Click connection downstream module at this module place when front port, pull initiatively connects up-stream module reception packet to the Click at this module place when front port, agnostic then is uncertain condition, namely does differentiating and processing according to the difference of the situation of connection.The connection principle of Click modular router is that port of the same type is connected, and the situation that the push port is connected with the pull port can not occur; The operation config string of module is actually with Click user provides the form of character string to carrying out functional configuration when front module.Config string occurs with the real ginseng tabular form of Click module class name or object name in the configuration script.Management system rewrites the operation config string realization of Click module to function management and the control of module by dynamic.
2) application of Click in the management system
Bottom OpenFlow SoftSwitch in the management system namely is to realize in the mode of kernel state module carry by the Click modular router that runs on the (SuSE) Linux OS.The assembly that this moment, some Click functional modules constituted replaces the ICP/IP protocol stack of operating system, and the data flow of this main frame of flowing through is carried out relevant treatment.In the design of systemic-function summary management system is divided into four assemblies according to function, the DiffServ functional unit that wherein is positioned on the bottom transmission node is realized by Click: wherein DiffServ traffic classification subfunction can realize based on the OpenFlow Click assembly of Click exploitation by the control of OpenFlow controller, oneself finishes OpenFlow Click and issues by the mode of increasing income via researcher's exploitation, its function is that the standard according to the OpenFlow agreement connects basic module in the Click modular router according to certain method, make it externally to become the module of an independent operating, the major function of OpenFlow switch is provided; Also can carry by Click
The IPClassifier module realizes the traffic classification of IP bag.Other functions independently realize each subfunction assembly and carry out correct connection according to the standard of DiffServ framework, and then constitute DiffServ Click.The connection instance graph that has shown a kind of DiffServ of comprising Click sub-function module as Fig. 5.
3) QoS centralized management system
The Click file system
When moving in the mode of kernel state, can in operating system, generate a file system, i.e. Click file system based on the Click modular router example of (SuSE) Linux OS automatically.This document system is positioned at/the Click catalogue under, the relevant configuration information that comprises the current Click example that is just moving with the modular manner carry in operating system is as the config string of the Click content for script of correspondence, sub-function module tabulation that the Click example comprises, Click submodule and each key parameter value thereof etc.But all management information of these current C lick running example are complete with respect to the demand of management system.Click file system and (SuSE) Linux OS /the proc file system is similar, and principle is by memory-mapped the real time data in the internal memory to be stored with the form of file, and the management method identical with ordinary file in the operating system is provided.Therefore, after moving a Click profile instance in the mode of kernel state, by associated documents executive system in the Click file system is called or read-write operation, management system can be obtained all running statuses and the configuration parameter of current C lick example in user's attitude, for management system provides key mechanism to configuration and the management of Click example.
The final realization of management system Core Feature is exactly to be undertaken alternately by relevant operating system system call and Click file system by the control agent assembly that is positioned at user's attitude.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (1)
1. QoS centralized management system based on the OpenFlow network, comprise OpenFlow switch and control node, it is characterized in that described OpenFlow switch comprises differentiated service functional unit and the control agent assembly that is linked in sequence, described differentiated service functional unit is used for the data of the node that arrives OpenFlow switch place are carried out standard QoS control, comprise data are carried out traffic classification successively, measure, mark, queue management and queue scheduling are handled, and described control agent assembly is for read/write operation that the parameter of differentiated service functional unit is correlated with; Described control node comprises command configuration assembly and the control and management assembly that is linked in sequence, described command configuration assembly is used for the instruction that receiving management person sends, and described control and management assembly is used for according to setting protocol format with the instruction encapsulation of keeper's transmission and transmitting.
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| CN104378309B (en) * | 2013-08-16 | 2019-05-21 | 中兴通讯股份有限公司 | Method, system and the relevant device of QoS are realized in OpenFlow network |
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| CN105791151B (en) * | 2014-12-22 | 2019-01-18 | 华为技术有限公司 | A kind of dynamic flow control method and device |
| CN105791151A (en) * | 2014-12-22 | 2016-07-20 | 华为技术有限公司 | Dynamic flow control method and device |
| CN105490962B (en) * | 2015-12-04 | 2018-10-26 | 哈尔滨工程大学 | A kind of QoS management methods based on OpenFlow networks |
| CN105490962A (en) * | 2015-12-04 | 2016-04-13 | 哈尔滨工程大学 | QoS management method based on OpenFlow network |
| CN106254271A (en) * | 2016-08-08 | 2016-12-21 | 北京邮电大学 | A kind of queue configuration method able to programme for software defined network and device |
| CN106254271B (en) * | 2016-08-08 | 2019-07-19 | 北京邮电大学 | A kind of programmable queue configuration method and device for software defined network |
| CN108270675A (en) * | 2016-12-30 | 2018-07-10 | 中国电信股份有限公司 | Flow table realizes controller, forwarding unit, system and method |
| CN108270675B (en) * | 2016-12-30 | 2020-10-30 | 中国电信股份有限公司 | Flow table implementation controller, forwarding device, system and method |
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Application publication date: 20130807 |