CN104734907A - Method for actively measuring end-to-end path performance of OpenFlow network and system adopted by the same - Google Patents
Method for actively measuring end-to-end path performance of OpenFlow network and system adopted by the same Download PDFInfo
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Abstract
The invention provides a method for actively measuring an end-to-end path performance of an OpenFlow network and a system adopted by the same. Aiming at the problem that the end-to-end path performance of the OpenFlow network is currently unable to be measured, the efficient measuring method and the system which use an OpenFlow active measurement protocol OFMP and regard a controller as a center are provided. The measuring method and the system can provide technological means and practical tools for debugging of an SDN control program, quantitative analyzing of an SDN architecture and a mechanism and assessing of network behaviors. Under the condition of clock synchronization of equipment, the system sends one packet so that the end-to-end performance parameters such as routing, a one-way delay, a round trip delay, a piecewise one-way delay, and a delay and a packet loss probability between a control plane and a data plane can be efficiently measured. In addition, under the condition that the clock is desynchronized or not-OFMP enabled equipment is provided, the measuring system can still measure part of major performance indexes, and the advantage that the spending for a processing OFMP is little is provided.
Description
Technical field
The invention belongs to network communication field, specifically propose a kind of method and system of Active measuring OpenFlow network end-to-end path performance.
Background technology
At present, the network architecture of software defined network (Software Defined Networking, SDN) is strengthening network function, shortens the transmission via net cycle and solve an internet difficult problem and provide a new technological approaches.Although based on OpenFlow SDN in the data the field such as the heart, network management, network security obtain application, demonstrate feasibility and the availability of SDN architecture, but because SDN framework is more complicated, and lack debugging SDN control program, quantitative analysis SDN architecture and technological means that is machine-processed and critic network behavior, these seriously hinder the scientific development of SDN.
The basic means of network behavior and the important method of qualitative assessment network performance are understood in network measure.Along with the development of technique of internet, develop the Network Measurement Technologies comprising Active measuring and passive measurement two kinds of patterns.And the OpenFlow specification in current SDN provide only the interface from controller Real-time Obtaining stream information, this provides a kind of centralized passive measurement mode to a certain extent.Passive measurement has its limitation, is difficult to measure the many kinds of parameters such as such as connective between 2 and connectivity and actualizing technology is complicated.The experience of IP network tells us, and network end-to-end path performance is one of most important index in network, and the Main Means obtaining performance parameter is Active measuring.Active measuring by sending measured message (sequence) to Trail termination source, the then change that produces in network transmission process of observation analysis measured message (probe), thus infer and network state and correlation performance parameters.This active is injected and the metering system following the tracks of true route of dividing into groups more can reflect problem truth.But SDN lacks practical Active measuring mechanism and method at present.
Active measuring mechanism in contrast IP network, is not difficult to find that in SDN, develop efficiently easy-to-use Active measuring mechanism also exists very large difficulty.First be feasibility, all give tacit consent between any 2 in IP network and there is end-to-end path, this makes measurement end to end performance become possibility, and the path in SDN (below for OpenFlow network) between 2 may not exist, even if exist, grouping also will defer to the flow forwarding rule that controller is handed down to switch.Next is ease for use, IP network has the agreement of network enabled measurement as Internet Control Message Protocol (Internet control messages protocol, ICMP), this makes Active measuring be easy to carry out, and in SDN, there is not so a kind of agreement.3rd is high efficiency, and IP node protocol stack built-in support Active measuring function, this enables measurement task efficiently complete, and SDN node can not provide this support.Realize efficiently easy-to-use SDN Active measuring mechanism must in the face of and address these problems.
Summary of the invention
The present invention is directed to problem, a kind of method proposing Active measuring OpenFlow network end-to-end path performance and the system adopted thereof that effectively cannot carry out end-to-end path performance measurement at present in OpenFlow network.
Technical scheme of the present invention is:
A method for Active measuring OpenFlow network end-to-end path performance, on the basis of OpenFlow specification, it comprises the following steps:
A. user sends the measurement instruction of network end-to-end path performance to the enable controller of OFMP, after the measurement instruction of the network end-to-end path performance that user sends received by the enable controller of OFMP, resolve measurement instruction and obtain measurement index and measuring route, structure OFMP measured message also writes the local measurement information of the enable controller of OFMP in measured message, jump OFMP enabled switch according to measuring route head wherein and send this measured message (first jumping and final jump switch are OFMP enabled switch), described OFMP measured message comprises the local measurement information of each OFMP enabled switch in measuring route and measuring route,
B. first jumping OFMP enabled switch receives the OFMP measured message from the enable controller of OFMP, local measurement information is write in measured message, send according to measuring route down hop switch, if this switch is OFMP enabled switch, in measured message, then write the local measurement information of this OFMP enabled switch, then down hop switch sends this measured message; If this switch is not OFMP enabled switch, then send this measured message to its down hop switch again; The all switches traveled through in measuring route complete the forwarding of OFMP measured message successively, and final jump OFMP enabled switch is returned the enable controller of OFMP after OFMP measured message write local measurement information;
The enable controller of C.OFMP, according to the requirement of measurement index, processes the local measurement information sequence of each enabled switch in OFMP measured message, obtains end-to-end path performance parameter, and show these performance parameters to user.
In steps A of the present invention: the enable controller of OFMP refers to that can understand OpenFlow measures agreement OFMP, and performs the OpenFlow controller of corresponding function; OFMP switch refers to that can understand OpenFlow measures agreement OFMP, and performs the OpenFlow switch of corresponding function.
In steps A of the present invention: measuring route refers to that measured message sends from the enable controller of OFMP in OpenFlow network, required by measurement index and the switch sequence set until return to the path of the enable controller of OFMP, in this path the part of switch sequence and the path of measured stream consistent.
In steps A of the present invention: measurement index refers to the performance measure of end-to-end path, comprise route namely measure grouping the path node sequence of process, round-trip delay, One Way Delay, packet loss, switch hop-by-hop time delay and between control plane and datum plane time Yanzhong one or more.
In steps A of the present invention: OFMP is the agreement that OFMP enabled switch communicates with between the enable controller of OFMP or OFMP enabled switch, the message format of OFMP comprises elementary field: Version field is for representing OFMP version number, Flag field comprises multiple metering system (as single measurement or repetitive measurement, unidirectional measurement or come and go measure) flag, Identification field and Sequence Number field are for identifying different Active measuring processes and the different messages in identical Active measuring process, Path Pointer field represents the pointer of the current location inserting path measurements record, Measurement Start field and Measurement End field are for the Dpid value of the starting point and terminal switch that identify measuring route, Path Record field arrives the moment of this equipment for the MAC and measured message depositing this node identification Dpid or main frame.
Local measurement information of the present invention comprises identifier and the local clock time of local device, and the identifier of described local device is Dpid or MAC Address.
In step B of the present invention, first jumping OFMP enabled switch receives the OFMP measured message from the enable controller of OFMP in PACKET OUT mode, and final jump switch, then return this measured message in PACKET IN mode to the enable controller of OFMP.
The system that a kind of method of Active measuring OpenFlow network end-to-end path performance adopts, it is characterized in that, on the basis of OpenFlow specification, OpenFlow Active Measurement System comprises an enable controller of OFMP and at least two OFMP enabled switch, during systematic survey end-to-end path, the head in path jumps and final jump switch is OFMP enabled switch.
In systems in which, the clock of the enable controller of OFMP and the enable detecting devices of all OFMP all can adopt as the methods such as NTP (Network Time Protocol) (NTP) or satellite time transfer carry out clock synchronous.If system clock synchronization, all properties index 4 can be measured, defining; If but system clock is asynchronous, the partial properties such as round-trip delay and packet loss index also can be measured;
Pass through the function of non-OFMP enabled switch.For the system that there is non-OFMP enabled switch (as OpenFlow switch), this measuring system still can measure the performance index such as the One Way Delay/packet loss of end-to-end path, two-way time delay/packet loss.
Beneficial effect of the present invention:
The present invention proposes the method and system that a kind of framework in a centralized measures OpenFlow network end-to-end path performance first, solves the difficult problem cannot measuring end-to-end path performance at present.
The present invention also has the following advantages: (1) is synchronous at equipment clock and in forwarding strategy situation without the need to change stream, controller send a measured message just can obtain efficiently specifying flow route, One Way Delay, round-trip delay, the piecemeal end to end performance such as One Way Delay and packet loss parameter; (2) under equipment clock out of step conditions, the important end to end performance parameter of part of specifying stream can be measured; (3) the enable node of non-OFMP can be crossed over measure; (4) expense processing OFMP is little; (5) can time delay between Survey control plane and datum plane.
Accompanying drawing explanation
Fig. 1 is the structural representation of Active Measurement System.
Fig. 2 is OFMP Message processing flow chart.
Fig. 3 be the full OFMP of path node enable time unidirectional accumulation time delay the experimental result schematic diagram of mean value.
Embodiment
With embodiment, the present invention is further described by reference to the accompanying drawings below.
First provide the environment wanted required for the present invention, Fig. 1 gives the experimental enviroment of system.2, main frame and Spirent flow generator 1 is held comprising the P3290 general switch 1 of OpenFlow enabled switch 5, PICA company, the enable controller of POX 1 and Linux.5 OpenFlow enabled switch S1, S2, S3, S5 and S6 are the Linux PC running openflow-1.0.0 software.These PC adopt i5-3470CPU, and dominant frequency is 3.2GHz, inside saves as 4GB, have 4 port gigabit ethernets, and their Dpid value is set to 1,2,3,5,6 respectively, and the Dpid of switch S4 is set to 4.Wherein switch S1, S2, S3, S5 and S6 and controller have all run OFM finger daemon, and be the enable node of OFMP, switch S4 is then that non-OFMP is enable.Controller have employed pox-carp version, and uses in-band method to interconnect between switch.Control subnet is 10.0.0.0/24, and the OpenFlow subnet of ip address of datum plane is 192.168.1.0/24.In addition, all switches all can run Network Time Protocol, and they and controller can carry out the clock synchronous of Millisecond.
Fig. 3 gives the flow chart of the embodiment of the present invention, and this flow process starts from step S101, and then in step s 102, user sends measurement instruction, and the enable controller of OFMP resolves measuring route and index, and structure measured message also writes metrical information, sends measured message; In step s 103, first OFMP enabled switch of jumping parses measured message, write metrical information; In step S104, judgement is the time delay between Survey control plane and datum plane, if so, sends out measured message, otherwise go to step S105 in step S111 to OFMP controller, and down hop switch sends measured message; Then arrive step S106, judge whether it is OFMP switch, if go to step S107, judge whether that this OFMP switch is path final jump; If so, go to step S111, otherwise go to step S108, judge whether be come and go measure and this OFMP switch is path mid point; If so, go to step S109, send out measured message by original route rightabout, then go to step S105, otherwise directly go to step S105.In step S111, go to step S112, OFMP controller process measured message display measurement information, finally to S113, handling process terminates.
Embodiment
This gives and end-to-end path is carried out to network environment as shown in Figure 1 to carry out the course of work of Active measuring as follows: first between S1 to S6, produce TCP background stream with Spirent Avalanche flow generator, and be that background stream sets up stream table by controller, make its route be S1-S2-S3-S5-S6 (path 1 namely in Fig. 1).Use Network Time Protocol to carry out clock synchronous between switch and controller, then, controller calls measures the end to end performance that application program measures this path, and initiate to measure with PACKET-OUT, the starting point of measurement is S1, and terminal is S6.When adopting bidirectional measurement pattern, measured message turns back to S1 by original route after arriving S6, returned the measured message with controller and each exchange board time stamp to controller by S1 PACKET-IN, these node identification of controller process and timestamp, obtain measurement result.Fig. 3 gives the mean value (mean value measured for 100 times) along route hop-by-hop One Way Delay.
Result of the test shows, the Dpid that the Active measuring message utilizing system to send obtains and timestamp sequence, we obtain the performance parameters such as hop-by-hop time delay and end-to-end One Way Delay.Wherein, switch node is often jumped time delay and is all greater than 0.1ms.Fig. 3 display is along with the increase of background traffic, and the stream grouped data of switch processes increases, and hop-by-hop time delay and end-to-end One Way Delay also increase thereupon, and this meets the situation of network reality.Hop-by-hop average delay and variance calculate as shown in table 1.
Table 1
From the measurement data of Fig. 3 and table 1, when background traffic progressively increases to 600Mbps from 10 Mbps, network is often jumped time delay and is all progressively being strengthened, and this increase due to network packet queuing delay causes.Under measuring at 100 times, the variance of hop-by-hop time delay is less, and this shows that the measurement result of system is more stable.For the network switch, because measured message is consistent with the traffic identifier of background stream, therefore forwarding behavior is also consistent, and therefore the Dpid that carries of measured message and timestamp sequence truly can reflect the performance parameter of the current tested end-to-end path of network.
Two ends are the enable node of OFMP and have part non-OFMP enabled switch (i.e. common OpenFlow switch) in the middle of route, and other conditions are same as test above.Specifically, the route that controller is set up is: S1-S2-S4-S5-S6 (path 2 in Fig. 1).Wherein commercial OpenFlow switch S4 runs OpenvSwitch1.9.2, OpenFlow protocol version is 1.0, and it does not support OFMP, and other nodes to be OFMP enable.This Time Controller initiates bidirectional measurement, and starting point is S1, and terminal is that S6, S6 receive the transmission in the other direction along this path after measured message, finally by S1 to controller return measurement message.Analysis shows, the node identification that this measured message has controller, S1, S2, S5 and S6 write and timestamp sequence, but does not have any information of S4.
Measurement result contrast in 1 and test 3 tested by table 2
Table 2 compared for the node sequence and path round-trip time delay that in test 1 and test 3, measured message is carried.Can find out, although path 1 and path 2 different, both round-trip delay mean value is substantially identical.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (8)
1. a method for Active measuring OpenFlow network end-to-end path performance, is characterized in that, on the basis of OpenFlow specification, it comprises the following steps:
A. user sends the measurement instruction of network end-to-end path performance to the enable controller of OFMP, after the measurement instruction of the network end-to-end path performance that user sends received by the enable controller of OFMP, resolve measurement instruction and obtain measurement index and measuring route, structure OFMP measured message also writes the local measurement information of the enable controller of OFMP in measured message, jump OFMP enabled switch according to measuring route head wherein and send this measured message, described OFMP measured message comprises the local measurement information of each OFMP enabled switch in measuring route and measuring route; Wherein, first jumping and final jump switch are OFMP enabled switch;
B. first jumping OFMP enabled switch receives the OFMP measured message from the enable controller of OFMP, local measurement information is write in measured message, send according to measuring route down hop switch, if this switch is OFMP enabled switch, in measured message, then write the local measurement information of this OFMP enabled switch, then down hop switch sends this measured message; If this switch is not OFMP enabled switch, then send this measured message to its down hop switch again; The all switches traveled through in measuring route complete the forwarding of OFMP measured message successively, and final jump OFMP enabled switch is returned the enable controller of OFMP after OFMP measured message write local measurement information;
C. the enable controller of OFMP is according to the requirement of measurement index, processes, obtains end-to-end path performance parameter, and show these performance parameters to user to the local measurement information sequence of each enabled switch in OFMP measured message.
2. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, in steps A: the enable controller of OFMP refers to that can understand OpenFlow measures agreement OFMP, and performs the OpenFlow controller of corresponding function; OFMP switch refers to that can understand OpenFlow measures agreement OFMP, and performs the OpenFlow switch of corresponding function.
3. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, in steps A: measuring route refers to that measured message sends from the enable controller of OFMP in OpenFlow network, required by measurement index and the switch sequence set until return to the path of the enable controller of OFMP, in this path the part of switch sequence and the path of measured stream consistent.
4. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, in steps A: measurement index refers to the performance measure of end-to-end path, comprise route namely measure grouping the path node sequence of process, round-trip delay, One Way Delay, packet loss, switch hop-by-hop time delay and between control plane and datum plane time Yanzhong one or more.
5. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, in steps A: OFMP is the agreement that OFMP enabled switch communicates with between the enable controller of OFMP or OFMP enabled switch, the message format of OFMP comprises elementary field: Version field is for representing OFMP version number, Flag field comprises the flag of multiple metering system, Identification field and Sequence Number field are for identifying different Active measuring processes and the different messages in identical Active measuring process, Path Pointer field represents the pointer of the current location inserting path measurements record, Measurement Start field and Measurement End field are for the Dpid value of the starting point and terminal switch that identify measuring route, Path Record field arrives the moment of this equipment for the MAC and measured message depositing this node identification Dpid or main frame.
6. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, local measurement information comprises identifier and the local clock time of local device, and the identifier of described local device is Dpid or MAC Address.
7. the method for Active measuring OpenFlow network end-to-end path performance according to claim 1, it is characterized in that, in step B, first jumping OFMP enabled switch receives the OFMP measured message from the enable controller of OFMP in PACKET OUT mode, final jump switch, then return this measured message in PACKET IN mode to the enable controller of OFMP.
8. the system that adopts of the method for an Active measuring OpenFlow network end-to-end path performance, it is characterized in that, on the basis of OpenFlow specification, OpenFlow Active Measurement System comprises an enable controller of OFMP and at least two OFMP enabled switch, during systematic survey end-to-end path, the head in path jumps and final jump switch is OFMP enabled switch.
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| CN106330555A (en) * | 2016-08-29 | 2017-01-11 | 南京市产品质量监督检验院 | OpenFlow switch performance parameter measurement method based on KPLS algorithm |
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