CN106452850A - SDN controller performance testing method and system - Google Patents
SDN controller performance testing method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/085—Retrieval of network configuration; Tracking network configuration history
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H04L43/00—Arrangements for monitoring or testing data switching networks
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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Abstract
The invention provides an SDN controller performance testing method and system. The SDN controller performance testing system comprises a topology and data flow information read-in unit, a network topology simulated unit, a network data flow generation unit, a data flow statistical unit, a data storing unit and a performance calculating unit. Through the stimulation of a plurality of topological structures and the generation of network data flows with different characteristics, it is possible to test the performances of a variety of controllers. In addition, the design of a testing system module enables the performance calculation to be more flexible so that calculations can be carried out based on various performance indexes.
Description
【Technical field】
Inventive network technical field, is related to SDN field, more particularly, to a kind of SDN controller performance method of testing
And system.
【Background technology】
The application drives such as cloud computing, mobile Internet and Internet of Things the development of data center, with various applications
Emergence, and the lifting to network bandwidth requirements, data center is faced with increasing challenge.And traditional network rack
Structure cannot meet growing demand, SDN (Software Defined at aspects such as motility, costs
Networking) and OpenFlow appearance will to data center produce revolutionary impact.
SDN/OpenFlow by network control planes data planar separation, it is right that realize according to specifically strategy by datum plane
The forwarding capability of packet, control plane realizes the centerized fusion to whole network by using controller.Due to controller
In system architecture, the difference of realizing in terms of language and DLL, therefore, its performance is also different.
The control plane of SDN achieves centralized management in logic, once controller lost efficacy, it will directly result in network paralysis
The performance of paralysis, therefore controller has important impact to the function of whole network and performance.In addition, the performance of controller for
For user, it is the important evidence choosing whether using this controller；For developer, then it is that the Primary Reference of research and development refers to
Mark.Therefore, controller performance test is a very important job.
In recent years, mainly have with regard to SDN controller performance testing method and tool：
(1)：Cbench (Controller benchmarker) is a OpenFlow controller performance testing tool, it
It is connected to controller to be tested by simulating a number of switch, and produces a large amount of PacketIn message, wait controller
Issue the performance that PacketOut message carrys out computing controller.
(2)：The investigation of SDN controller and quantitative analysiss, propose a kind of controller performance based on Mininet emulation platform
Method of testing.It utilizes Mininet artificial network topology, and switch is connected long-range controller, by running ping utility,
The average ping latency of test heterogeneous networks topology and pingall time, the performance of different controllers is weighed with this.
In scheme (1), Cbench simulates N number of disconnected OpenFlow switch, produces a large amount of PacketIn message.But
It is the communication that the producing method of this PacketIn message have ignored between switch, this will affect controller performance test result
Accuracy.And the defect due to programming, Cbench do not support the test to multi-controller performance.
Scheme (2) method of testing is simple, does not have modular system design.And only consider controller from time angle
Performance, ignore the handling capacity of controller.In addition, Mininet is a simulated environment, need to rely on actual physical equipment, this
Body does not have the function of test controller performance yet.Utilize merely ping utility test it is difficult to ensure the accuracy of experimental result.
【Content of the invention】
It is an object of the invention to provide a kind of SDN controller performance method of testing and system, single in solution SDN/
The performance test problem of multi-controller it is achieved that modular SDN controller performance test system, simultaneously to multiple controllers
When being tested, between controller area, flow makes test result more closing to reality scene.
The purpose of the present invention is achieved through the following technical solutions：
A kind of SDN controller performance test system, reads in unit, network topological simulating list including topological sum flow information
Unit, network traffics signal generating unit, traffic statistics unit, data storage cell and Performance Calculation unit；
Topological sum flow information reads in unit and is used for for test profile being converted into network topology and flow information；Described
Topological sum flow information reads in unit and includes topology information reading unit and flow information reading unit；
Network topological simulating unit is used for emulating corresponding network node and network link, network topology according to topology information
Simulation unit, according to topology information, the telephone net node in artificial network and the connection status between node of input, makes to own
Telephone net node is set up with controller to be tested and is connected；
Network traffics signal generating unit is used for generating packet according to the network topology of generation and flow configuration information；
Traffic statistics unit is used for the packet information interacting between recording controller and network topology；
Data storage cell is used for storing the packet information in test process；
Performance Calculation unit is used for reading traffic statistics the performance according to performance indications formula computing controller.
Further, described network traffics signal generating unit is according to the flow information receiving and the topology information having generated,
Generate the flow of individual features, and call the interface transmitted traffic packet of telephone net node.
Further, when in artificial network, telephone net node passes through secure channel communication with controller, traffic statistics unit
According to the type of test pattern record data bag, quantity and temporal information.
Further, data storage cell is used for for the packet information of traffic statistics unit record being stored in certain data knot
In structure, provide the interface of quick search packet information to other units of system simultaneously.
A kind of SDN controller performance method of testing, comprises the steps：
(1). topological sum flow information reads in unit and will emulate the reading of topological sum flow information according to test profile, opens up
Information of flutterring is read in unit and topology information is converted into the discernible data structure of system is stored, and flow information reads in unit will
The eigenvalue of flow information carries out being extracted and stored in corresponding data structure；
(2). network topological simulating unit is according to the topology information being stored in related data structures, the institute in artificial network
Have the link between telephone net node and node, be telephone net node configuration ip and port attribute, be link configuration chain-circuit time delay and
Bandwidth attribute；
(3). network traffics signal generating unit reads the characteristic value information of simulating traffic, according to data package size, stream interval, source
IP, purpose IP and port information create traffic generator, then pass through network traffics signal generating unit and network topological simulating unit
Between interface flow is injected in the switch of artificial network；
(4). after emulated switch receives flow, the behavior of simulation OpenFlow switch, do not mate stream in flow table item
The stream rule of amount, data envelope is contained in PacketIn message and is sent to controller by switch, produces the communication stream that test needs
Amount.Traffic statistics unit is according to the relevant information of communication flows between test pattern record artificial network and controller；
(5). data storage cell provides write and reads interface for other cell calls.Traffic statistics unit 104 will be remembered
The flow information of record is stored in data storage cell；
(6). the reading interface of Performance Calculation cell call data storage cell, flow information is read according to test pattern,
And according to performance Index Calculation formula, controller performance is calculated.
Further, after the once test completing controller performance, test system is secondary by the test in test profile
Number k subtracts 1, if k is more than 0, repeats step (1)～(6) described in 7 again.
Further, network traffics signal generating unit can either directly generate PacketIn message, and calls the switch of emulation
Node interface sends it to controller；Also TCP or UDP flow amount can be generated, OpenFlow is converted into by telephone net node
Message.
Further, described step (4) is specially：
S1：The test pattern M of traffic statistics unit read test configuration file；
S2：If test pattern is in response to latency pattern, go to step S6；
S3：The transmission time T1 of first PacketIn message of record；
S4：Check the correctness of PacketOut message, if by the response of PacketIn message trigger, system is received
PacketOut quantity N arriving adds up Jia 1, and stores reception time T2, otherwise ignores and does not deal with；
S5：, until no longer receiving PacketOut message, the memory interface calling data storage cell will for repeat step S4
The value of T1, T2 and N is stored in unit, goes to step S9；
S6：Call data storage cell interface that PacketIn message and transmission time T1 are stored in data storage cell；
S7：Searched corresponding according to bufferID the or data field in the PacketOut message that artificial network receives
The message of PacketIn, is stored in its corresponding reception time T2；
S8：Until no longer receiving PacketOut message, each PacketIn message corresponds to circulation S6, S7 calculation process
T1 and T2 message be stored in data storage cell；
S9：Exit traffic statistics unit.
The SDN controller performance method of testing that the present invention provides, by emulating various topological structures and generating different characteristic
Network traffics, the performance of multi-controller is tested, and, the design of test system module makes Performance Calculation more
Flexibly, can be calculated according to multiple performance index.
The invention has the advantages that：
(1) flexible test environment, the system uses the mode of configuration file, and the network using during convenient modification test is opened up
The information such as traffic characteristic when flutterring, and testing.
(2) various flow rate generating mode, system both can generate TCP or UDP flow amount, passes through afterwards to emulate OpenFlow
Switch sends PacketIn message；PacketIn packet can also be directly generated, call exchange interface by data is activation
To controller.
(3) modular system design, the test for controller performance provides greater flexibility.User can be according to need
Add new performance indications, and traffic statistics unit and the implementation method of Performance Calculation unit are provided, thus realizing this performance
The calculating of index, expands the function of controller performance test system.
【Brief description】
Fig. 1 is controller performance test system framework figure proposed by the present invention；
Fig. 2 is operating diagram in the specific embodiment of the invention；
Fig. 3 is the flow chart of controller simulation network topology in the specific embodiment of the invention；
Fig. 4 is the flow chart that in the specific embodiment of the invention, controller generates network traffics；
Fig. 5 is SDN controller performance test system cell schematics in the specific embodiment of the invention.
【Specific embodiment】
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, all other reality that those of ordinary skill in the art are obtained under the premise of not making creative work
Apply example, broadly fall into the scope of protection of the invention.
The invention provides a kind of SDN controller performance method of testing.By modularized design, emulate various topological structures
And network traffics, the performance of analysis computing controller.
1st, the key object in controller performance Design of Test System
As shown in figure 5, in the specific embodiment of the invention, SDN controller performance test system, it includes substantially single as follows
Unit：
Topological sum flow information reads in unit 101 and is used for for test profile converting network topology and flow information, opens up
Flutter and include topology information reading unit 1011 and flow information reading unit 1012 with flow information reading unit 101；
Network topological simulating unit 102 is according to topology information, the telephone net node in artificial network and the node of input
Between connection status, so that all telephone net nodes and controller to be tested is set up and be connected；
Network traffics signal generating unit 103, according to the flow information receiving and the topology information having generated, generates corresponding
The flow of characteristic, and call the interface transmitted traffic packet of telephone net node；
Traffic statistics unit 104 is used for the packet information interacting between recording controller and network topology, when emulation net
When in network, telephone net node passes through secure channel communication with controller, traffic statistics unit 104 is according to test pattern record data
The information such as the type of bag, quantity and time；
The packet information that data storage cell 105 is used for recording traffic statistics unit 104 is stored in certain data knot
In structure, provide the interface of quick search packet information to other units of system simultaneously；
Performance Calculation unit 106 is used for reading traffic statistics, and according to user-defined user performance Index Formula
The performance of computing controller.
2nd, the present invention describes in detail
Shown in Figure 1, give modular controller performance test system framework figure.This system includes configuration and carries
Enter, topology simulation, traffic generating, traffic statistics with analysis data store five modules.
Traffic generating module is the basis of whole system, and its Main Function is to generate different characteristic according to configuration file
Flow, is injected in artificial network topology by the interface with topology simulation module.
Topology simulation module is responsible for creating different types of network topology, emulation OpenFlow switch, host port with
And link, and simulate the behavior of OpenFlow switch and set up with controller and be connected, complete PacketIn/PacketOut message
Send and receive.Topology simulation module is in the centre position of data flow, and it provides downwards the interface of traffic generating module,
To inject test flow；The interface of traffic statistics analysis module, process time data bag record are provided upwards.
The packet information that record test system sends and receives is responsible in traffic statistics and analysis.Control is sent to for system
The uplink traffic of device, needs to record the transmission time of PacketIn message, and preserves under response delay test pattern
PacketIn message, for later stage and PacketOut matching primitives.Controller is sent to the downlink traffic of system, module
Need to record time and its quantity that PacketOut message reaches.Disappear because the system short time can receive a large amount of PacketOut
Breath, direct computing controller performance can affect test result, so getting the relevant information of PacketIn/PacketOut
Afterwards, module needs to be deposited into data memory module, and the controller performance for the later stage calculates.Traffic statistics and analysis module root
According to the relevant information in data memory module, the performance of computing controller.
Data memory module is responsible for storage system convection current statistics of variables data, including PacketIn send time,
Data domain in PacketIn, PacketOut receive time and PacketOut quantity, and all of data is used for the later stage to control
The calculating of device performance.
Configuration insmods, and connection system is inside and outside, and it is permissible that the configuration file of its exterior is converted into system by module
The data structure of identification.It is decomposed into the topology information of network, including exchanger information, link after Content Transformation in configuration file
Information, with controller link information etc., and the characteristic information of flow.
Shown in Figure 2, the work process of SDN controller performance test system comprises the following steps：
S1：System brings into operation, and configures the reading configuration file that insmods, and reads configuration information therein, network is opened up
Flutter and be separately converted in the data structure that topology simulation module and traffic generating module can identify with flow information；
S2：Topology simulation module according to topological configuration data, emulates telephone net node in SDN, and switch it
Between link simulation include link delay, bandwidth etc..
S3：After traffic generating module receives flow configuration information, according to bag size, stream interval, source/destination IP and port etc.
Flow is injected into emulation net by the interface between traffic generating module and topology simulation module by information creating traffic generator
In the switch of network.
S4：After emulated switch receives flow, the behavior of simulation OpenFlow switch, do not mate flow in flow table item
Stream rule, data envelope is contained in PacketIn message and is sent to traffic statistics and processed with analysis module by switch.
S5：Traffic statistics are recorded according to test pattern (throughput mode and response delay pattern) with analysis module
PacketIn size of data, quantity, and corresponding time.All data that traffic statistics and analysis module are recorded pass through number
Processed according to memory module.
S6：The PacketOut message that controller issues reaches network simulation switch, traffic statistics and analysis module first
Time and the quantity of bag that record PacketOut reaches, then read the transmission time of corresponding PacketIn message, calculate and ring
Answer time delay.Read size of data and the quantity of PacketIn message, calculate handling capacity.
In order to realize SDN controller performance test system, need to solve two subject matters.
(1) network topology generates problem
In order to test controller connects performance when different scales, heterogeneous networks topology, system needs to generate various structures
Network topology, the verity of network element behavior will be ensured simultaneously.Therefore, topology simulation assembly should have following functions：First
First, can be with simulated linear, fat tree, the no various topological structures such as connection；Secondly, simulation node has real OpenFlow and exchanges
Machine behavior, realization is interacted with controller；Finally emulation link can arrange the attributes such as bandwidth, time delay.
With reference to Fig. 3 network topology product process figure, assembly call first the corresponding interface obtain network in node element be
The title of switch and its attribute, and the telephone net node in network is set up according to these information, imitate in Network switch nodes
After the completion of true, system obtains the information of link in network, starts artificial network link.If link nodes include controller,
So system is needed to set up telephone net node and is connected with the TCP of controller, if being all simulation node, then system is imitative by setting up
True link, completes the emulation of link.
(2) self-defined network traffics generate
In order to ensure the verity of the performance test results, the flow that system generates should be based on the topology generating.I.e.
Test system both can generate flow in domain, to test the disposal ability to flow in domain for the single controller；Can generate between domain again
Flow, to test the disposal ability of flow between multi-controller domain.And, the flow generating, when sending, speed should reach control
The process bottleneck of device processed.
In order to realize generating the function of multiple network topology, topology simulation assembly by network abstraction for node element and
Side, using the property of figure, by node and side information Store in the data structure of figure, and imitates accordingly according to the information foundation of figure
True node and link.Wherein simulation node will simulate the basic function of OpenFlow switch, and have DPID and uniquely mark
Know.Emulation two analog switch of link connection, and there is the attributes such as time delay, bandwidth.
In order to ensure the correctness of test result, based on existing emulation topology, traffic generating assembly should determine that flow is special
Property is so as to have the attributes such as source/destination ip, port number data bag size.
Network section with reference to shown in Fig. 4, first in searching loop test profile for the workflow of traffic generating assembly
Point, checks whether comprise flow traffic parameter in its property parameters, if comprising traffic flow parameter, needs to build
Vertical volume event.Traffic generating assembly defines according to flow and reads flow regulator list, then travels through flow regulator successively,
Volume event is set up according to the attribute in flow regulator, and is added into volume event list.When system start-up network topology
Afterwards, traffic generating assembly is injected into corresponding telephone net node by activating volume event.
The SDN controller performance method of testing that the present invention provides, can be by emulating various topological structures and different characteristic
Network traffics, the performance of multi-controller is tested, and, the design of this test system moduleization makes Performance Calculation more
Plus flexibly, can be calculated according to multiple performance index.
The above is the preferred embodiment of the present invention, by described above content, the related work of the art
Personnel can carry out various improvement and replacement on the premise of without departing from the technology of the present invention principle, and these improve and replace
Should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of SDN controller performance test system it is characterised in that：Read in unit (101), net including topological sum flow information
Network topology simulation unit (102), network traffics signal generating unit (103), traffic statistics unit (104), data storage cell (105)
With Performance Calculation unit (106)；
Topological sum flow information reads in unit (101) and is used for for test profile being converted into network topology and flow information；Institute
State topological sum flow information and read in unit (101) inclusion topology information reading unit (1011) and flow information reading unit
(1012)；
Network topological simulating unit (102) is used for emulating corresponding network node and network link according to topology information, and network is opened up
Flutter topology information, the telephone net node in artificial network and the connection status between node according to input for the simulation unit (102),
Make all telephone net nodes set up with controller to be tested to be connected；
Network traffics signal generating unit (103) is used for generating packet according to the network topology of generation and flow configuration information；
Traffic statistics unit (104) is used for the packet information interacting between recording controller and network topology；
Data storage cell (105) is used for storing the packet information in test process；
Performance Calculation unit (106) is used for reading traffic statistics the performance according to performance indications formula computing controller.
2. SDN controller performance test system as claimed in claim 1 it is characterised in that：Described network traffics signal generating unit
(103) according to the flow information receiving and the topology information having generated, generate the flow of individual features, and call switch
The interface transmitted traffic packet of node.
3. SDN controller performance test system as claimed in claim 1 it is characterised in that：When switch section in artificial network
When point passes through secure channel communication with controller, traffic statistics unit (104) is according to the type of test pattern record data bag, number
Amount and temporal information.
4. SDN controller performance test system as claimed in claim 1 it is characterised in that：Data storage cell (105) is used for
The packet information of traffic statistics unit record is stored in certain data structure, provides to other units of system fast simultaneously
The interface of packet information is ask in quick checking.
5. a kind of SDN controller performance method of testing of system described in any one based on claim 1-4 is it is characterised in that wrap
Include following steps：
(1). topological sum flow information reads in unit (101) and will emulate the reading of topological sum flow information according to test profile,
Topology information is converted into the discernible data structure of system and is stored by topology information reading unit (1011), and flow information is read
Enter unit (1012) to carry out being extracted and stored in corresponding data structure by the eigenvalue of flow information；
(2). network topological simulating unit (102) basis is stored in the topology information in related data structures, in artificial network
Link between all telephone net nodes and node, is telephone net node configuration ip and port attribute, is link configuration chain-circuit time delay
And bandwidth attribute；
(3). network traffics signal generating unit (103) reads the characteristic value information of simulating traffic, be spaced according to data package size, stream,
Source IP, purpose IP and port information create traffic generator, then pass through network traffics signal generating unit (103) and network topology is imitated
Flow is injected in the switch of artificial network interface between true unit (102)；
(4). after emulated switch receives flow, the behavior of simulation OpenFlow switch, do not mate flow in flow table item
Stream rule, data envelope is contained in PacketIn message and is sent to controller by switch, produces the communication flows that test needs, stream
Amount statistic unit (104) is according to the relevant information of communication flows between test pattern record artificial network and controller；
(5). data storage cell (105) provides write and reads interface for other cell calls.Traffic statistics unit 104 will be remembered
The flow information of record is stored in data storage cell (105)；
(6). Performance Calculation unit (106) calls the reading interface of data storage cell (105), reads flow according to test pattern
Information, and according to performance Index Calculation formula, controller performance is calculated.
6. method according to claim 5 it is characterised in that：After the once test completing controller performance, test system
Testing time k in test profile is subtracted 1 by system, if k is more than 0, repeats step (1)～(6) described in 7 again.
7. method according to claim 5 it is characterised in that：Network traffics signal generating unit (103) can either directly generate
PacketIn message, and call the telephone net node interface of emulation to send it to controller；Also TCP or UDP flow amount can be generated,
OpenFlow message is converted into by telephone net node.
8. method according to claim 5 is it is characterised in that described step (4) is specially：
S1：The test pattern M of traffic statistics unit (104) read test configuration file；
S2：If test pattern is in response to latency pattern, go to step S6；
S3：The transmission time T1 of first PacketIn message of record；
S4：Check the correctness of PacketOut message, if by the response of PacketIn message trigger, system is received
PacketOut quantity N adds up Jia 1, and stores reception time T2, otherwise ignores and does not deal with；
S5：, until no longer receiving PacketOut message, the memory interface calling data storage cell (105) will for repeat step S4
The value of T1, T2 and N is stored in unit, goes to step S9；
S6：Call data storage cell interface that PacketIn message and transmission time T1 are stored in data storage cell (105)；
S7：Searched corresponding according to bufferID the or data field in the PacketOut message that artificial network receives
The message of PacketIn, is stored in its corresponding reception time T2；
S8：Circulate S6, S7 calculation process until no longer receiving PacketOut message, the corresponding T1 of each PacketIn message
It is stored in data storage cell with T2 message；
S9：Exit traffic statistics unit.
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