CN101330411B - Method and system for simulating large-scale network topological - Google Patents
Method and system for simulating large-scale network topological Download PDFInfo
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Abstract
The invention discloses a method for stimulating a large-scale network topology and a system thereof. The method comprises the following steps: (1) a first device under test (DUT) utilizes VPN technology to construct a plurality of VRF processes, wherein the interface of the first DUT enables a corresponding sub-interface for each VRF process; (2) each sub-interface of the first DUT receives a test flow from a first test instrument; (3) if the sub-interface studies the routing information from a second test instrument from a second DUT, then the sub-interface sends the test flow to the second test instrument according to the routing information. The method and the system can test network diffusion performance only by using four testing resources, including the first test instrument, the first DUT, the second DUT and the second test instrument, and compared with the prior art, the method and the system save a large quantity of repetitive configurations and physical links as well as the required labor and time thereof,.
Description
Technical field
The present invention relates to data communication and network topology thereof, relate in particular to a kind of method and system of simulating large-scale network topological.
Background technology
Along with the continuous propelling of social informatization, people increase day by day to the demand of data communication.Since last century, middle nineteen seventies was released, now developed into the de facto standard of network layer communication agreement from ICP/IP protocol bunch, also become maximum, most important network based on the internet of TCP/IP.
Router is as the agreement that interconnects between the network (Internet Protocol, IP) server equipment has obtained unprecedentedly using widely, its technology has become the key technology of current information industry, and this has played more and more important effect its equipment in data communication.As the nucleus equipment of public network, the quality of router performance directly influences IP network network size, network stabilization and network scalability.So the test to router has its importance and necessity.
In data communication network, as communicate the information that to obtain relevant data chain line and data encapsulation along physical pathway, also need to obtain and preserve involved relevant information in transport layer/network layer, these relevant informations are stored in the routing table, it has identified the many information such as next jumping that reach that comprise objective network, is the basic passage of data forwarding aspect.The generation and the management of routing table are controlled by Routing Protocol, Routing Protocol is divided into static routing protocol and dynamic routing protocol, dynamic routing protocol can make the network also variation of response to network topology automatically rapidly, dynamic routing protocol commonly used has ospf (Open Shortest Path First, OSPF), Border Gateway Protocol (Border Gateway Protocol, BGP), routing information protocol (Routing InformationProtocol, RIP), Intermediate System-to-Intermediate System (Intermediate System-IntermediateSystem, ISIS) etc.Dynamic routing is selected to compare static routing and is selected, and maximum advantage is that dynamic routing is selected to alleviate the influence that change in topology is brought.Agreement not only execution route decision-making and routing table update function are selected in dynamic routing, but also will be when optimal path is unavailable, next bar optimal path of making a strategic decision.
Present performance of route protocol test comprises contents such as constringency performance, extensibility, route flapping performance, route learning/diffusion time usually.In actual application, particularly in the core layer network topology, because the Routing Protocol neighbours are numerous, the renewal of route need be to numerous neighbours' diffusions, route diffusion in this larger network topology is tested, particularly in non-existing network environment, how the performance of simulation test equipment in this environment is an important problem.At present, the typical method that route study/diffusion is tested is, is example with the OSPF Routing Protocol:
Test the diffusion of OSPF route in the large-scale network topological, promptly when new advertising of route or the inefficacy of original route, node in the network need send LSA (Link-StateAdvertisement, LSA) renewal message is given its neighbor node, when there is more neighbor node in this node, receive from first neighbor node and to upgrade message and upgrade it and transmit, all receive to all neighbor nodes and to upgrade message and finish to transmit separately and upgrade the needed time, reflected the performance of router diffusion route in the whole network.
Test Networking such as Fig. 1 of conventional OSPF route diffusion, equipment under test (DUT) comprises first equipment under test ..., n equipment under test, n+1 equipment under test; From first equipment under test to the n equipment under test all is the ospf neighbor of n+1 equipment under test, and each equipment under test all connects with it corresponding tester, that is, first equipment under test is connected with first tester, ..., the n equipment under test is connected with the n tester.
, flood to its n neighbours by the n+1 equipment under test again to n+1 equipment under test announcement OSPF LSA by the n+1 tester, i.e. first equipment under test ..., the n equipment under test.
Test topology such as Fig. 1, first tester ..., the stream that the n tester is all being sent out same to specified network prefixes all the time.At first equipment under test ..., when the n equipment under test was not all also received the LSA of specified network prefixes, the flow of receiving on the n+1 tester was 0; When first equipment under test ..., after having an equipment under test to receive the LSA of specified network prefixes in the n equipment under test and upgrading it and transmit, the n+1 tester begins to receive partial discharge; When first equipment under test, ..., after all equipment under tests in the n equipment under test were all received all network prefix LSA and upgraded transmitting separately, the flow that the n+1 tester is received began to equal the summation that first tester to the n tester sends flow.The n+1 tester is exactly the diffusion time of OSPF route on this network from beginning to receive that flow equals other n platform tester to flow and sends the time that the flow summation is spent.
In the ideal case, to the test of route, only need two tester ports, two equipment to single neighbours' diffusion.But this method of testing is had relatively high expectations for equipment and test instrumentation port; And this method of testing is under the situation that simulation routing neighbor quantity increases, test Routing Protocol capacity strengthens, and when carrying out the test of route whole network diffusion, following problems may be encountered: need more equipment under test and tester resource.Require tester port and the linear increase of equipment under test number.Illustrate, in 200 neighbours' diffusion, this method of testing needs 201 test instrumentation ports and 201 equipment in the test route, and this is implacable in actual test process.And, build such large-scale network topological and need on router and tester, carry out a large amount of repeated configuration and physical connection, need more manpower of cost and time.
Therefore, also there is defective in prior art, awaits improving and development.
Summary of the invention
The technical problem that the present invention solves provides a kind of method and system of simulating large-scale network topological, adopts this method and system to carry out the test of network diffusion by enough less test resources.
For solving the problems of the technologies described above, the present invention adopts following scheme:
A kind of method of simulating large-scale network topological may further comprise the steps, and S1, first equipment under test utilize VPN technologies to set up a plurality of VRF processes, and the interface of first equipment under test is enabled corresponding sub-interface for each VRF process; Each sub-interface of S2, described first equipment under test receives the test stream from first tester; If the VRF process under the described sub-interface of S3 is learnt routing iinformation from second tester from second equipment under test, the VRF process under the then described sub-interface is sent to described second tester according to this routing iinformation with described test stream.
Described method, wherein, further comprising the steps of: S4, described second tester send to described second equipment under test and cancel the announcement of routing iinformation; S5, described sub-interface receive by second equipment under test transmit cancel announcement after, delete described routing iinformation; It is 0 process from beginning to reduce to flow that S6, described second tester write down instantaneous delivery on it.
Described method, wherein, described test stream is the test stream of specifying network prefix, described routing iinformation is the routing iinformation of specifying network prefix.
Described method, wherein, the test stream that the number of the network prefix of the described second tester appointment and first tester send is corresponding one by one.
Described method, wherein, the neighborhood between first equipment under test and second equipment under test comprises: be in the same area, be in zones of different.
Described method, wherein, described step S1 also comprises: the number of specifying described equipment under test.
The present invention also provides a kind of system of simulating large-scale network topological, comprise: first tester of Lian Jieing, first equipment under test, second equipment under test, second tester successively, wherein, also comprise many group instantiation modules, every group of instantiation module comprises: one group of set of interfaces that is arranged on first tester, first equipment under test and second equipment under test respectively, the Routing Protocol of one this set of interfaces special use, a routing table independently; Described set of interfaces is used for flowing, receiving routing iinformation from described second tester from described second equipment under test from the described first tester acceptance test by this Routing Protocol, this routing iinformation is write in the described routing table, and by this Routing Protocol described test stream is sent to described second tester according to this routing iinformation.
Described system, wherein, described second tester comprises: cancel notification unit, be used for cancelling the announcement of routing iinformation to the transmission of second equipment under test; Logging modle is used to write down instantaneous delivery on second tester and is reduced to 0 process.
Described system, wherein, described first equipment under test and second equipment under test are respectively the first router and the second router.
Described system, wherein, described first equipment under test and second equipment under test are respectively first switch and second switch.
Compared with prior art, the present invention's first equipment under test utilizes VPN technologies to set up a plurality of VRF processes, because each VRF process has one group of set of interfaces that is arranged on first equipment under test, links to each other with second equipment under test with first tester respectively, the Routing Protocol of one this set of interfaces special use, a routing table independently; Set of interfaces is used for flowing, receiving routing iinformation from second tester from described second equipment under test from the described first tester acceptance test by this Routing Protocol, this routing iinformation is write in the described routing table, and by this Routing Protocol described test stream is sent to second tester according to this routing iinformation.Like this, only adopted first tester, first equipment under test, second equipment under test and four test resources of second tester can finish the test of network diffusion.And, saved a large amount of repeated configuration and physical connection compared to prior art, and manpower that will spend and time.
Description of drawings
Fig. 1 is the performance test networking schematic diagram of OSPF route diffusion of the prior art;
Fig. 2 is the physical schematic of the performance test networking of OSPF route diffusion of the present invention;
Fig. 3 is the logical schematic of the performance test networking of OSPF route diffusion of the present invention;
Fig. 4 is the concrete implementation step flow chart when increasing the OSPF route newly among the present invention;
Fig. 5 is the concrete implementation step flow chart when cancelling the OSPF route among the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing.
Core of the present invention is, bristle with anger to each sub-interface of first equipment under test by first tester and to decide the stream of network prefix, have only when the routing table of VRF process under the sub-interface has the route of (perhaps not having) specified network prefixes, flow just can be forwarded (perhaps abandoning), can judge thus whether the VRF process under this sub-interface has finished routing update.Under the prerequisite of using less router and tester resource, a kind of method of simulating large-scale network topological is provided, be example also below with the OSPF Routing Protocol, technical scheme of the present invention is described.
VPN (Virtual Private Network, virtual private networks) utilizes public network to make up private dedicated network, makes the VPN of setting up on public network provide fail safe, reliability and manageability etc. as the existing private network of enterprise.VPN is not genuine dedicated network, but can rely on because of special service provider and other Internet Service Provider, sets up the technology of special-purpose data communication network in common network.In VPN, the connection between any two nodes does not have the required physical link end to end of traditional private network, but utilizes the logical network on the resource dynamic of certain public network to form, and user data transmits in logical links.
VRF (VPN Routing﹠amp; Forwarding Instance, the VPN route and transmit) be "VPN routing and forwarding (VRF) instance because each virtual router has: a VRF routing table (comprising independently address space) independently; One group of set that belongs to the interface of this VRF; One group of Routing Protocol that only is used for this VRF.Each VRF process can be regarded a virtual router as, similarly be PE (the Provider Edge Router of a special use, the backbone network edge router) equipment, virtual router can be isolated the route between the different VPN user, also can solve the overlapping problem of IP address space between the different VPN.
The present invention by the following technical solutions,
100, first equipment under test utilizes VPN to set up a plurality of VRF processes, and the interface of first equipment under test is enabled the sub-interface of corresponding number for each VRF process,
That is, on first equipment under test, enable sub-interface, utilize that different VRF processes have separately independently VRF routing table on first equipment under test, set up the neighbours of different OSPF VRF processes by corresponding sub-interface respectively with first tester and second equipment under test;
May further comprise the steps:
110, first equipment under test has first interface and second interface, and first interface and second interface are physical interfaces, and first interface comprises a plurality of sub-interfaces, is respectively Int1.1～Int1.n, and second interface comprises a plurality of sub-interfaces, is respectively Int2.1～Int2.n; Equally, Int3.1～Int3.n is a plurality of sub-interfaces of the 3rd interface on first tester; Int4.1～Int4.n is a plurality of sub-interfaces of the 4th interface on second equipment under test, referring to Fig. 3;
120, the sub-interface of first tester by the 3rd interface, the neighbours that set up OSPF with the corresponding sub-interface of first interface of first equipment under test; Second equipment under test is set up ospf neighbor by the sub-interface of the 4th interface with the corresponding sub-interface of second interface of first equipment under test; Ospf neighbor in the networking all reaches the full state.
Referring to Fig. 2, on first equipment under test, the sub-interface in first interface belongs to identical VRF process with sub-interface in corresponding second interface, that is, (1≤i≤n) belongs to identical VRF process i for Int1.i and Int2.i.Because each VRF process all has an independently routing table, need transmit according to the routing table of VRF process i from the flow that Int1.i enters, the route of learning from the neighbours of Int2.i also only can be upgraded the routing table of VRF process i, so can come certain equipment under test in the simulation drawing 1 with the VRF process i on first equipment under test, thereby realize with of the simulation of first equipment under test to n platform equipment under test among Fig. 1.
It below is the newly-increased route diffusion in networking of test.As shown in Figure 4,
200, each sub-interface of first equipment under test receives the test stream from the corresponding sub-interface of first tester; For example, test stream is the stream of certain specified network prefixes.
If 300 described sub-interfaces have been learnt routing iinformation from second tester from second equipment under test, then described sub-interface is sent to second tester according to this routing iinformation with described test stream.May further comprise the steps:
310, second tester is to second equipment under test announcement routing iinformation; Corresponding with the stream of specified network prefixes in the step 200, this routing iinformation is the LSA that specifies network segment prefix;
320, after second equipment under test is learnt these routing iinformations, can flood to each neighbours of second equipment under test, flow is received in beginning gradually on second tester;
330, on first equipment under test all VRF processes all learn these routing iinformations and finish transmit renewal separately after, the instantaneous delivery of receiving on second tester begins to equal the summation of the instantaneous delivery that first tester sends.
Begin to be increased to instantaneous delivery from instantaneous delivery on second tester and reach peaked process, reflected that router is to the diffusion of newly-increased OSPF route under this networking.This is because have only when in the routing table of VRF process under the sub-interface corresponding routing iinformation being arranged, test stream just can be forwarded to second tester, thus, second tester can judge whether the VRF process under this sub-interface has finished routing update, the foundation of judging the route diffusion process is that second tester flows to reception fully from the beginning acceptance test, show that route diffusion finishes, finish traffic statistics.
Introduce VRF and solved the flow decision problem of route after each neighbours' diffusion in the large scale network simulation.With topological diagram 2 contrasts of not introducing VRF, among Fig. 2 when a plurality of sub-interfaces are set up the Routing Protocol neighbours, as long as second equipment under test has been finished the route diffusion to one of them sub-interface neighbour, flow is all to receive, and can't judge whether other neighbours have finished diffusion from the size that receives flow.And after introducing VRF, have only second equipment under test after all neighbours finish the route diffusion, and flow could all receive, otherwise second tester can only receive partial discharge.Compare with existing network, this test is invented on the basis of dynamic routing protocol, in conjunction with the characteristics of VPN route, has realized the simulation to large-scale network topological neatly, has used less test resource.
Similarly, the diffusion when identical networking (as shown in Figure 2) can be tested OSPF and cancels route, prerequisite is that second tester has been announced routing iinformation, and these routing iinformations are learnt by all the VRF processes in the networking.Concrete implementation step is as follows, sees Fig. 5:
500, first equipment under test is set up ospf neighbor with first tester, second equipment under test respectively by sub-interface, and second tester and second equipment under test are set up ospf neighbor, and the ospf neighbor in the networking all reaches the full state;
600, first tester is by the sub-interface of the 3rd interface, the test stream that each sub-interface of first interface is bristled with anger and decided network prefix on first equipment under test respectively can see that instantaneous delivery that this moment, second tester was received equals the summation of the instantaneous delivery that first tester sends;
700, second tester sends to second equipment under test and cancels the announcement of routing iinformation, i.e. the LSA of second tester appointment network segment prefix of announcement before second equipment under test is cancelled;
800, second equipment under test receives that second tester sends out cancel announcement and upgrade message after, immediately to its neighbor advertisement, after the neighbours of certain VRF process received that upgrading message also upgrades transmitting of oneself, its routing iinformation of corresponding deletion, the flow that second tester is received began to reduce; This moment is constant by the flow that first tester sends; The flow that receives on second tester can reduce gradually, is because route withdraw, and flow can not forward from first equipment under test.
900, on first equipment under test all VRF processes all receive upgrade message and finish separately transmit renewal after, the flow that second tester is received is kept to 0.
Begin to reduce to instantaneous delivery from instantaneous delivery on second tester and be kept to 0 process, reflected that router is to cancelling the diffusion of OSPF route under this networking.
To sum up, the present invention sets up a plurality of VRF processes by sub-interface, utilizes large-scale network topological of two routers simulation, the performance test of route diffusion in the router networking is become be easy to realize.Described here only is a basic networking mode, also has a lot of method of testing combinations certainly.Simultaneously, the parameter in the test also can be made amendment, and as the number of specified network prefixes, the numerical value of n, zone that neighbours adhere to separately or the like, just gives unnecessary details no longer one by one here.
In addition, the present invention also provides a kind of system of simulating large-scale network topological, comprise: first tester of Lian Jieing, first equipment under test, second equipment under test, second tester successively, also comprise many group instantiation modules, every group of instantiation module comprises: one group of set of interfaces that is arranged on first tester, first equipment under test and second equipment under test respectively, the Routing Protocol of one this set of interfaces special use, a routing table independently; Described set of interfaces is used for flowing, receiving routing iinformation from second tester from second equipment under test from the first tester acceptance test by this Routing Protocol, this routing iinformation is write in the described routing table, and by this Routing Protocol described test stream is sent to second tester according to this routing iinformation.In this embodiment, by a plurality of equipment under tests of a plurality of instantiation module simulations, reached the purpose that reduces equipment under test, and, can adopt the scheme in the present embodiment, second tester writes down the test stream of its reception from beginning to be increased to the process that stops to increase, and finishes the test of network diffusion.
On the basis of a last execution mode, further be improved to, described second tester comprises: cancel notification unit, be used for cancelling the announcement of routing iinformation to the transmission of second equipment under test; Logging modle is used to write down instantaneous delivery on second tester and is reduced to 0 process.Adopt the scheme in the present embodiment, the test stream that second tester writes down its reception also can be finished the test of network diffusion from beginning to reduce to 0 the process of being reduced to.
Described first equipment under test and second equipment under test are respectively the first router and the second router.Certainly described first equipment under test and second equipment under test also can be respectively first switch and second switch.
Should be understood that; the above embodiment that provides is just to explanation of the present invention; and not should be understood to limitation of the present invention; to those skilled in the art; can be improved according to the above description or conversion; and all these improve and conversion all should be disclosed principle and feature, all belong to protection scope of the present invention.
Claims (7)
1. a method of simulating large-scale network topological is characterized in that, may further comprise the steps:
S1, first equipment under test utilize the virtual private network technology to set up a plurality of Virtual Switch Instance VRF processes, and the interface of first equipment under test is enabled corresponding sub-interface for each VRF process;
Each sub-interface of S2, described first equipment under test receives the test stream from the corresponding sub-interface of first tester;
S3, if the sub-interface of described first equipment under test has been learnt routing iinformation from second tester from second equipment under test, the sub-interface of then described first equipment under test is sent to described second tester according to described routing iinformation with described test stream;
S4, after the instantaneous delivery that second tester is received equals the summation of the instantaneous delivery that first tester sends, described second tester sends to described second equipment under test and cancels the announcement of routing iinformation;
The sub-interface of S5, described first equipment under test receive by second equipment under test transmit cancel announcement after, delete described routing iinformation;
S6, described second tester record begin to reduce to instantaneous delivery from instantaneous delivery and are kept to 0 process.
2. method according to claim 1 is characterized in that, described test stream is the test stream of specifying network prefix, and described routing iinformation is the routing iinformation of specifying network prefix.
3. method according to claim 1 is characterized in that, the test stream that the number of the network prefix of the described second tester appointment and first tester send is corresponding one by one.
4. method according to claim 1 is characterized in that, the neighborhood between first equipment under test and second equipment under test comprises: be in the same area, be in zones of different.
5. system of simulating large-scale network topological, comprise: first tester of Lian Jieing, first equipment under test, second equipment under test, second tester successively, it is characterized in that, also comprise many group instantiation modules, every group of instantiation module comprises: one group of set of interfaces that is arranged on first tester, first equipment under test and second equipment under test respectively, the Routing Protocol of one this set of interfaces special use, a routing table independently; The Routing Protocol of described set of interfaces utilization special use and independently routing table communicate;
Described set of interfaces is used for flowing, receiving routing iinformation from described second tester from described second equipment under test from the described first tester acceptance test by described Routing Protocol, described routing iinformation is write in the described routing table, and by described Routing Protocol described test stream is sent to described second tester according to described routing iinformation;
Described second tester comprises: cancel notification unit, be used for after the instantaneous delivery that second tester is received equals the summation of the instantaneous delivery that first tester sends, send to second equipment under test and cancel the announcement of routing iinformation; Logging modle is used to write down and begins to reduce to instantaneous delivery from instantaneous delivery on second tester and be kept to 0 process.
6. system according to claim 5 is characterized in that, described first equipment under test and second equipment under test are respectively the first router and the second router.
7. system according to claim 5 is characterized in that, described first equipment under test and second equipment under test are respectively first switch and second switch.
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| CN101527730B (en) * | 2009-05-04 | 2012-05-30 | 中国电信股份有限公司 | Test method for obtaining load factors of router and system thereof |
| CN103873311B (en) * | 2012-12-11 | 2017-05-31 | 中国移动通信集团公司 | A kind of method of testing and system for router forwarding information table capacity |
| CN104468285B (en) * | 2014-12-31 | 2018-04-27 | 迈普通信技术股份有限公司 | Network equipment multicast performance measuring method and system |
| CN106911538B (en) * | 2017-04-24 | 2019-11-12 | 新华三技术有限公司 | Flow statistical method and device |
| CN110266597B (en) * | 2019-06-17 | 2021-10-22 | 北京百度网讯科技有限公司 | Flow control method, device, equipment and storage medium |
| CN113794584B (en) * | 2021-08-15 | 2023-04-14 | 新华三信息安全技术有限公司 | Network management method and equipment |
| CN114285783B (en) * | 2021-12-14 | 2023-08-11 | 中国联合网络通信集团有限公司 | Route diffusion simulation method and device based on multiple matrixes |
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