CN104954166A - Hardware based network simulation system and method - Google Patents
Hardware based network simulation system and method Download PDFInfo
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- CN104954166A CN104954166A CN201510206210.0A CN201510206210A CN104954166A CN 104954166 A CN104954166 A CN 104954166A CN 201510206210 A CN201510206210 A CN 201510206210A CN 104954166 A CN104954166 A CN 104954166A
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H—ELECTRICITY
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Abstract
The invention discloses a hardware based network simulation system. The system comprises a network simulation unit and multiple simulation nodes, wherein the network simulation unit adjusts the topological graph of the simulation nodes in a simulation network according to users, and configures characteristic parameters of a simulation link connected to the simulation nodes; and based on the adjusted network topological graph and the configured link characteristic parameters, the simulation nodes implements simulated experiments on the network protocols or server program via the simulation link. The invention further discloses a simulation method based on the network simulation system. Compared with a traditional network experiment platform, a network simulator computer (or embedded equipment) is connected with multiple simulation node computers, a simulation control system of the network simulator computer is operated to realize network topology change and configuration of the characteristic parameters of the simulation link, and the network protocol can be verified under different network topologies and link characteristic parameters via fewer common computers.
Description
Technical field
The present invention relates to computer networking technology, particularly relate to a kind of hardware based network (WSN) emulation system and emulation mode.
Background technology
In the design of Internet agreement, experimental verification is one of them very important link.In the early-stage Study in prophesy stage, carry out large-area deployment experiment infeasible, therefore adopt simulation means to be necessary to the performance test that communication protocol or Routing Protocol are carried out under heterogeneous networks topology and link property.
At present, mainly contain software emulation and simple demo system for the emulation of the performance of procotol and the method such as to build.Wherein network software emulation is the statistical model by setting up the network equipment and network link, and the transmission of analog network flow, thus obtain the emulation technology of network design or the network performance data required for optimization.Because software emulation is not based on mathematical computations, but Corpus--based Method model, therefore, the randomness of statistic multiplexing is accurately reproduced, but due to amount of calculation huge, be difficult to realize real-time, software emulation cannot realize actual physical interface simultaneously, and simulation result and reality may have certain gap; The method that simple demo system is built builds fixing topological environmental by topology design in advance in laboratory environment, this emulation mode is true, credible, some problems of energy reaction network agreement, but experiment topology is fixing, network link characteristic configuration difficulty, operating flexibility is poor, is difficult to realize fairly large emulation experiment.
Therefore, need to build a kind of network (WSN) emulation system, realize the experimental verification fairly large under heterogeneous networks topology, link characteristic parameters to procotol by a small amount of common computer.
Summary of the invention
For solving the problems of the technologies described above, concrete technical scheme of the present invention is that hardware based network (WSN) emulation system is made up of a network simulator and some simulation nodes.Network simulator is a multiport computer or embedded device, it runs the server end having Topology g eneration software, link property configuration software, management simulation node software, carries out Local or Remote configuration by user interface; Simulation node is entity computer or virtual machine, runs the procotol program or business procedure that have and need test.
The parameter configuration of network simulator primary responsibility Topology g eneration, each emulation link;
1) generation of topology: first generate artificial network topological diagram according to user configured Connectivity matrix, Connectivity situation between two in connective matrix notation network topology, network simulator goes the connectedness between Controlling vertex by Connectivity matrix;
2) link characteristic parameters configuration: in the present invention, for making full use of computer resource, each simulation physical port of network simulator is invented multiple virtual port, the corresponding virtual link of each virtual port, every bar virtual link has corresponding bandwidth according to emulation demand, time delay, shake, the characteristics such as the error rate, each virtual link characterisitic parameter adopts link control software configuration, be configured as linux system TC (Traffic Control) instrument can be adopted, article one, a channel under virtual link corresponding respective physical ether port, by queue discipline under configuration TC instrument, class and filter configure different virtual link characteristic parameters.
Simulation node, runs and has experimental network agreement or business procedure, can be used as source, destination node, routing node etc.Each simulation node has a control port and an analog port: control port is connected switch, for telemanagement and configuration; Analog port interconnection network simulator, for emulation experiment.Meanwhile, in order to improve the simplification of simulation operations, the client-side program of simulation node also operational management simulation node software.For saving computer resource, virtual machine technique is adopted to be several virtual emulation nodes by a physical simulation node virtual.Dummy node and physical node are without any difference.
The overall technical architecture that the present invention adopts is as follows:
A kind of hardware based network (WSN) emulation system, this system comprises
A network analog unit, generates artificial network topological diagram based on the connective matrix of user configured simulation node, and is configured emulation link characteristic parameters;
Multiple simulation node, based on the link characteristic parameters of described artificial network topological diagram and configuration, carries out the emulation experiment of procotol or business procedure.
Preferably, described network analog unit comprises
Topology g eneration module, according to described Connectivity matrix, generates artificial network topological diagram;
Link configuration module, carries out parameter configuration according to subscriber simulation demand to emulation link;
Node control module, carries out basic controlling based on control link to simulation node in network.
Preferably, described network analog unit comprises
Node administration server, is obtained emulation link topology information and the simulation node experimental data of simulation node in artificial network in real time, and node control information is sent to simulation node by control link by control link;
Topology Discovery module, for periodic from transferring simulation node topology information node administration server, and is shown in real time by user interface.
Preferably, described network analog unit comprises
Database, for storing user configured topological diagram information and link configuration information;
General module, for setting up the information interaction of network analog unit and user, the format check data in database carried out based on user instruction, insertion, amendment and deletion action.
Preferably, described simulation node comprises node administration client, for the experimental data of current simulation node being carried out collection management and controlling simulation node based on the node control information that described node administration server sends.
Preferably, described simulation node comprises
The control port be connected with the switch of remote terminal, for the formation of control link, realizes telemanagement and configuration;
The analog port be connected with network analog unit, for the formation of emulation link, performs emulation experiment.
Based on an emulation mode for network (WSN) emulation system described in claim 1, the step of the method comprises
User configures the IP address of each emulated port of simulation node and network analog unit, and registers simulation node information in network analog unit;
Generate artificial network topological diagram based on user configured Connectivity matrix, and emulation link characteristic parameters is configured;
Simulation node carries out emulation experiment using described artificial network topological diagram and link characteristic parameters as experiment simulation environment;
Collect experimental data, obtain the simulation experiment result by analysis.
Preferably, the configuration step of described simulation node comprises
According to the IP address information of each emulated port of emulation demand configuration network simulator, as configurable different emulated port IP address network difference, its gateway and DNS are not configured;
Number according to simulation node corresponding to network analog unit emulation physical port configures corresponding virtual port, and collocation method is determined according to demand, as number different in configurable each virtual port IP address network;
The IP address of the emulated port of configuration simulation node, the network number that collocation method is determined because of demand as configurable each simulation node emulated port IP address network number coupled network simulator emulated port IP address is identical, gateway is the IP address of map network analogue unit port, comprise the IP address of its virtual port simultaneously, do not configure the DNS of simulation node emulated port.
Preferably, the step of the method comprises the artificial network topological diagram, the simulation node that adjust is connective at every turn and link characteristic parameters further stored in database, restarts configuration and the recovery of post-simulation network topology and link characteristic parameters for analogue system.
Preferably, the step of the method comprises further
Use topological diagram and the link property in method configuration each moment of emulation experiment that predetermined file imports or user interface directly inputs;
System cycle detects and obtains artificial network topological diagram or link property not situation of change in the same time;
According to the topological diagram obtained or link property situation of change, dynamic-configuration is carried out to emulation link.
The present invention uses a small amount of common computer to build fairly large, topological dynamic configuration, that link characteristic parameters can be joined procotol experimental situation.Such as, the common computer of 10 ports is used to do network simulator, the common computer of 9 medium configurations, 2 ports does physical simulation node, can realize the simulation scale of 81 nodes, and the network topology of 81 node compositions can pass through Simulation Platform Software system arbitrary disposition with corresponding link characteristic parameters.
Beneficial effect of the present invention is as follows:
Traditional network experimental platform topology is fixing, small scale, configuration are loaded down with trivial details, and a corresponding network simulation node of computer, serious waste computer resource.Technical scheme of the present invention is connected with some simulation node computers by a network simulator computer (or embedded device), realize network topology change by the analog control system operated on network simulator computer and link characteristic parameters configures, realize the experimental verification that a small amount of common computer is fairly large under heterogeneous networks topology, link characteristic parameters to procotol.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail;
Fig. 1 illustrates the schematic diagram of simple network topological diagram in the embodiment of the present invention;
Fig. 2 illustrates the schematic diagram of the connection matrix that simple network topological diagram is corresponding in the embodiment of the present invention;
Fig. 3 illustrates the schematic diagram of embodiment of the present invention link characterisitic parameter allocation plan one;
Fig. 4 illustrates the schematic diagram of embodiment of the present invention link characterisitic parameter allocation plan two;
Fig. 5 illustrates the schematic diagram of network (WSN) emulation system of the present invention;
Fig. 6 illustrates the schematic diagram of complex simulation network topological diagram in the embodiment of the present invention;
Fig. 7 illustrates the structure chart of network (WSN) emulation system of the present invention.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
Be illustrated in figure 1 a simple example network topology, with it, concrete grammar of Topology g eneration in the present invention be described at this.Topology g eneration is based on such principle, and namely no matter many complicated topological diagrams can represent by node connectedness between any two.In the present invention, in order to meet the demand of some ad hoc network agreement researchs, as the research of procotol in mobile ad hoc network, being communicated with and there is directivity: assuming that node H1, H2, H1->H2 is communicated with, and does not represent H2->H1 and is communicated with.As, if H1 node can only send message to H2, and can not accept the message of H2 node, then connective situation is now that H1->H2 is communicated with, and H2->H1 is not communicated with.
As shown in Figure 2, be the matrix notation of above-mentioned simple network topology connectivity.Wherein, the row of matrix and leu represent node H1, H2, H3, and position corresponding in matrix is be not communicated with between these two nodes of 0 expression, and being communicated with between 1 these two nodes of expression, is connected relation between node and node self.Topology g eneration software reads the connectedness of matrix with behavior unit, in Fig. 2, the first row representation node H1 of matrix is communicated with to the connective situation of other nodes: H1->H1, H1->H2 is communicated with, and H1->H3 is not communicated with.This matrix is generated or importing configuration files generation by the Web User Interface manual configuration of simulator software control system by user, and stored in database, is finally called by Topology g eneration module and generate artificial network topological diagram.
The present embodiment does link characteristic parameters configuration based on the TC instrument of (SuSE) Linux OS, and TC is primarily of queue discipline, class, these 3 assembly compositions of filter.As shown in Figure 3, circular represent queue discipline, rectangle representation class, filter according to the filtering rule of self-defining (as source, object IP to) packet is divided into different classes.A class represents a virtual link in the present invention, and link property is the same with Connectivity, has directivity, and the number of virtual link is determined by concrete network topology, and a simulation node may have multiple virtual link.The agreement of emulation is different, and the determination mode of virtual link may be different; Here, we with the source of direct-link node, object IP address in emulation topology to determining virtual link.
The solution of two kinds of virtual link configurations is provided in the present embodiment:
Scheme one, uses queue discipline (Priority, PRIO) the configuration virtual link parameter based on priority.Because PRIO priority number is limited, be maximumly classified as about 10 grades, under therefore this scheme is only adapted to little (the being no more than 10) situation of artificial network topology is fairly simple, each physical port of network simulator is corresponding virtual link number.The link characteristic parameters configuration structure of this scheme as shown in Figure 3, first TC instrument is used to set up 10 PRIO classification, then in each classification, use token bucket (Tocken Bucket Filter, TBF) queue discipline and network analog (Network Emulation, Netem) queue discipline, because Netem can not connect other queues again, so place it in the last of each classification.TBF queue discipline is used for the bandwidth (speed) of configuration virtual link, and Netem queue discipline is used for the parameter such as time delay, the error rate of configuration link.Each classification is determined by source and object IP, represents a virtual link, and in the use in PRIO, we use filter to classify to packet, does not utilize the function that PRIO classifies according to packet priority field.Because TC instrument can only the rate of discharge characteristic of control port, so in network simulator during configuration virtual link, link parameter should be configured at the network simulator physical port place that destination host is corresponding.Therefore, in network topology, the virtual link of direct-link node different directions should be configured in the different port of simulator.
Scheme two, uses token bucket (Hierarchical Token Bucket, HTB) the queue discipline configuration virtual link characteristic parameters of layering.HTB queue discipline is unlike the restriction of PRIO queue discipline number of categories by priority number, as long as Installed System Memory is enough large in theory, HTB can add countless multiple classification, and therefore it can meet the demand that in complex topology, virtual link is many.Use HTB to carry out the structure chart of virtual link characterisitic parameter configuration as shown in Figure 4, built-in TBF queue discipline in each HTB class, therefore in the diagram, each HTB classification adds circle with a rectangle and represents; The built-in speed limiting function of HTB queue discipline, so only need add a Netem queue discipline carries out other parameter configuration of virtual link after each HTB classification.Other situations of scheme two are identical with scheme one.
Fig. 5 is hardware based network (WSN) emulation system overall construction drawing, the present embodiment adopts control link and the thought emulating link disjoint, each simulation node has two links: one is control link, for researcher or run on simulation node management software on network simulator to simulation node configuration, monitoring and control, control link can carry out the basic controlling such as node dormancy, shutdown to node; Article one, be emulation link, for the experiment simulation of procotol.In the diagram, the dotted line without arrow is control link, and it connects switch and simulation node; Solid line with four-headed arrow and dotted line for emulate link, its interconnection network simulator and simulation node.By control link, researcher can use remote terminal to control any one simulation node and network simulator in platform.As shown in Figure 5, selected 5 common computer to be example in the present embodiment, being designated as H0-H4:H0 has 10 ether port eth0-eth9, and as network simulator, Fig. 5 shows the connection of its port eth0 to eth4, and other port connections are omitted.H1-H4 is emulation computer, according to configuration height, respectively by its virtual be 6,5,6,4 dummy nodes, each dummy node runs linux system, is to save device resource, and system cloud gray model is at command mode.
Network simulator computer is installed NFS (Network File System, NFS) server, then passes through control link shared file to simulation node, improve analogue system ease for operation.The control port connecting Internet of simulation node and network simulator computer, conveniently installs and downloads software, is convenient to researcher's telnet management node.The emulated port of simulation node for gateway, economizes the work of configure routing table with the IP address of port corresponding to network simulator.Network simulator computer is provided with Apache, PHP, MYSQL server, for supporting the operation of Web User Interface supervisor.
As shown in Figure 6, for complex simulation network topological diagram, wherein there are 18 simulation nodes, the hardware based network (WSN) emulation system shown in Fig. 5 is used to emulate in the present embodiment, in Fig. 6, the sequence number of 18 nodes is corresponding with the numerical portion of simulation node title each in Fig. 5, No. 1 node as corresponding in H1, corresponding No. 18 nodes of V18.According to topological diagram, we can obtain the number of analog link corresponding to each physical port of network simulator.Illustrate, the simulation node that the port eth1 of network analog is corresponding in Figure 5 has H1, V5-V9 six, and the node number corresponding to Fig. 6 is 1,5-9; In figure 6, object is that the virtual link of node 1 or 5-9 has 4,5,7,2,1 respectively, 1, and be added to obtain virtual link number 20 corresponding to network simulator port eth1, be greater than 10, therefore it needs operational version two to carry out the configuration of virtual link characterisitic parameter.Make to use the same method, we can obtain the number of virtual link corresponding to other ports of network simulator.Before system cloud gray model, we carry out automatic configuration link characteristic by link configuration module analysis network topology matrix and link parameter information.
As shown in Figure 7, be analogue system software architecture diagram, software agent part operates on network simulator, only has " node administration client " to operate in each simulation node, for management node, collector node artificial intelligence.The main part of analogue system software comprises WEB user interface, general module, Topology g eneration module, link configuration module, Topology Discovery module, node control module, node administration server end and database.Whole software adopts MVC framework, the full name of MVC is Model View Controller, it is the abbreviation of model (model)-view (view)-controller (controller), a kind of Software for Design model, code is organized by a kind of method that service logic, data, interface display are separated, service logic is gathered an inside components, while improvement and personalized customization interface and user interactions, do not need again to write service logic.General module is responsible for the mutual of bottom module and upper layer module, simultaneously the operation of database, as the operation such as format check, insertion, amendment, deletion data when data insert amendment.In the present invention, general module can also perform another one task: be exactly complete according to the record of database the configuration etc. that analogue system restarts post-simulation network topology and link characteristic parameters to resume work.Topology g eneration module, by the connectedness of user configured Connectivity matrix configuration network simulator link, generates artificial network topological diagram.Link configuration module configures every bar link delay, shake, the error rate, data rearrangement according to the configuration information of user to link property and the link property such as to copy.Node administration server end collects artificial network topology information by control link, Topology Discovery module periodically calls the artificial network topology information of node administration module server end mobile phone, profile information in current artificial network is shown by WEB interface by Topology Discovery module in real time, in simulation process, observe simulation status for researcher, judge whether system is normally run.Node control module is responsible for the interpolation of simulation node, amendment, deletion action, is realized operations such as the start of virtual emulation node, dormancy, shutdown, forced shutdown, abnormality processing by user interface interaction simultaneously.In addition, node administration module server end is also responsible for collecting each node experiment data of being paid by control link by node administration module client, is convenient to the statistical analysis of researcher to experimental result.
Use hardware based network (WSN) emulation system simulation process as follows:
Step 1, configuration of IP address.Each emulated port of simulation node and network simulator is configured according to emulation object.Allow simulation node be in the allocation plan of all-pass state between any two with reference to as follows: a 1. IP address for each emulated port of configuration network simulator, different emulated port IP address network difference, does not configure its gateway and DNS; 2. corresponding virtual port is configured according to the number of simulation node corresponding to network simulator physical port, 5 virtual emulation nodes as corresponding in network simulator port eth1 in Fig. 5, therefore need configuration 5 virtual ports, and each virtual port IP address network is number different; 3. the IP address of the emulated port of simulation node is configured, the network number of each simulation node emulated port IP address network number coupled network simulator emulated port IP address is identical, gateway is the IP address (comprising the IP address of its virtual port) of map network simulator port, does not configure the DNS of simulation node emulated port.
Step 2, register node information.In network simulator software systems, add simulation node information, comprise simulation node name, be subordinate to simulation node name, control port IP address, analog port IP address, if virtual emulation node, simulation node name walks abreast identical with corresponding virtual machine name.Nodal information is preserved in a database by general module.
Step 3, generates topological diagram.According to emulation topology in user interface drawing topological graph or interpolation Connectivity entry, then general module generates topological matrix, preserves in a database.General module generates the virtual link entry needing configuration according to topological matrix simultaneously, is presented at user interface, is convenient to user's configuration virtual link.
Step 4, configuration virtual link.The virtual link entry that configuration above-mentioned steps generates, is stored into database by general module.
Step 5, generates topology and link property.After all link entry have configured, general module calls Topology g eneration module and link characteristic parameters configuration module generates experiment simulation environment.In addition, in order to meet the emulation demand (as satellite simulation experiment) of some topological periodically variable experiment scenes, simulation softward system also provides the function of topological diagram and link property dynamic change, system is imported by file or is directly manually imported topological diagram and the link property in each moment of emulation experiment by user, general module periodically detects fileinfo, if topological diagram or link property change, then carry out dynamic-configuration.
Step 6, opens simulated program.Procotol or business procedure in node control module or remote terminal control imitation node is used to run.Topology Discovery module detects topology information simultaneously, and is presented at user interface in real time.
Step 5, collects experimental data.In experimentation, node administration module (comprising server end and client) collects experimental data; After experiment terminates, the experimental data that researcher's analytical system is collected, draws experiment conclusion.
By above step, can realize carrying out fairly large, that topology changes flexibly, that link property can be joined network experiment by a small amount of common computer.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all execution modes, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (10)
1. a hardware based network (WSN) emulation system, is characterized in that, this system comprises
A network analog unit, generates artificial network topological diagram based on the connective matrix of user configured simulation node, and is configured emulation link characteristic parameters;
Multiple simulation node, based on the link characteristic parameters of described artificial network topological diagram and configuration, carries out the emulation experiment of procotol or business procedure.
2. network (WSN) emulation system according to claim 1, is characterized in that, described network analog unit comprises
Topology g eneration module, according to described Connectivity matrix, generates artificial network topological diagram;
Link configuration module, carries out parameter configuration according to subscriber simulation demand to link;
Node control module, carries out basic controlling based on control link to simulation node in network.
3. network (WSN) emulation system according to claim 2, is characterized in that, described network analog unit comprises
Node administration server, is obtained topology information and the simulation node experimental data of simulation node in artificial network in real time, and node control information is sent to simulation node by link;
Topology Discovery module, for periodic from transferring simulation node topology information node administration server, and is shown in real time by user interface.
4. the network (WSN) emulation system according to claims 1 to 3 any one, is characterized in that, described network analog unit comprises
Database, for storing user configured topological diagram information and link configuration information;
General module, for setting up the information interaction of network analog unit and user, the format check data in database carried out based on user instruction, insertion, amendment and deletion action.
5. network (WSN) emulation system according to claim 3, it is characterized in that, described simulation node comprises node administration client, for the experimental data of current simulation node being carried out collection management and controlling simulation node based on the node control information that described node administration server sends.
6. network (WSN) emulation system according to claim 5, is characterized in that, described simulation node comprises
The control port be connected with the switch of remote terminal, for the formation of control link, realizes telemanagement and configuration;
The analog port be connected with network analog unit, for the formation of emulation link, performs emulation experiment.
7. based on an emulation mode for network (WSN) emulation system described in claim 1, it is characterized in that, the step of the method comprises
User configures the IP address of each emulated port of simulation node and network analog unit, and registers simulation node information in network analog unit;
Generate artificial network topological diagram based on user configured Connectivity matrix, and emulation link characteristic parameters is configured;
Simulation node carries out emulation experiment using described artificial network topological diagram and emulation link characteristic parameters as experiment simulation environment;
Collect experimental data, obtain the simulation experiment result by analysis.
8. emulation mode according to claim 7, is characterized in that, the configuration step of described simulation node comprises
According to the IP address information of each emulated port of emulation demand configuration network simulator, as configurable different emulated port IP address network difference, its gateway and DNS are not configured;
Number according to simulation node corresponding to network analog unit physical port configures corresponding virtual port, and collocation method is determined according to demand, as number different in configurable each virtual port IP address network;
The IP address of the emulated port of configuration simulation node, the network number that collocation method is determined because of demand as configurable each simulation node emulated port IP address network number coupled network simulator emulated port IP address is identical, gateway is the IP address of map network analogue unit port, comprise the IP address of its virtual port simultaneously, do not configure the DNS of simulation node emulated port.
9. emulation mode according to claim 7, it is characterized in that, the step of the method comprises the artificial network topological diagram adjusted, simulation node connectedness at every turn further and emulates link characteristic parameters stored in database, restarts post-simulation network topology and the configuration and the recovery that emulate link characteristic parameters for analogue system.
10. emulation mode according to claim 7, is characterized in that, the step of the method comprises further
Use topological diagram and the link property in method configuration each moment of artificial network that predetermined file imports or user interface directly inputs;
System cycle detects and obtains artificial network topological diagram or link property not situation of change in the same time;
According to the topological diagram obtained or link property situation of change, dynamic-configuration is carried out to emulation link.
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