CN114422010A - Protocol testing method of satellite communication simulation platform based on network virtualization - Google Patents
Protocol testing method of satellite communication simulation platform based on network virtualization Download PDFInfo
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Abstract
The invention relates to a protocol testing method of a satellite communication simulation platform based on network virtualization, which is characterized in that a satellite communication network simulation platform capable of realizing virtual-real interconnection is constructed by utilizing a network function virtualization technology, the platform is a four-layer framework, and the first layer is a user interface layer and is used for network topology structure customization, test protocol arrangement, test control and result output; the second layer is a user instruction analysis layer, generates a virtual container and a link establishing instruction according to a network topological structure formulated by a user, converts a protocol arranged by the user into a uniform format instruction set, and converts a returned test result into a chart form to be presented to the user; the third layer is a virtual satellite communication network management layer and is used for creating, configuring and destroying the satellite network nodes and the links; and the fourth layer is an operation monitoring layer, collects operation data and feeds back the operation data to the user. Dynamic deployment and operation tests of various heterogeneous protocols are realized based on the platform, and the test difficulty of the satellite communication network protocol is effectively reduced.
Description
Technical Field
The invention relates to a protocol testing method of a satellite communication simulation platform based on network virtualization, and belongs to the field of satellite communication networks.
Background
With the increasing demand for ubiquitous communications and the increasing of high data rate data communication services, the advantages of seamless coverage and large communication capacity of satellite communication will play a key role in the new generation of communication systems. In addition, with the improvement of the functions of baseband data exchange and processing on the satellite, the communication satellite can not only realize the forwarding of data any more, but also realize the multiplexing, exchange, routing, storage and processing of data, so that the application of the satellite communication network and the research on related technologies are endless. However, since the satellite channel has the characteristics of prolonged transmission time, large time delay jitter, asymmetric link bandwidth and the like, the technology which is already applied in the ground network in a mature way is not completely applicable to broadband satellite communication, so that the existing ground network cannot provide a test and verification environment for application and technical research of the satellite communication network. Satellite communication networks are time-varying macrosystems that are complex complexes rather than simple heaps of large numbers of channels and satellites. Although theoretically, we can adopt condition scenarios based on a real satellite communication network, a satellite network prototype system or an analog simulation system to test and verify satellite communication network related technologies, these scenarios still have many limitations:
first, it is not practical to perform real tests on satellite communication networks in actual operation. Various types of satellite communication networks are responsible for important communication services and are not capable of performing any tests that may cause network instability.
Secondly, a satellite communication network physical environment capable of representing large-scale and complex network characteristics is established, and is not feasible economically, temporally and technically; and the small scale and simple scene can hardly ensure the fidelity of the satellite communication network. When various application tests are carried out, the satellite communication network environment also has the defects of high guarantee cost, long maintenance period, low test verification efficiency, non-visual result presentation and the like.
Thirdly, the existing simulation system is adopted to construct the satellite communication network, and because the characteristics of the satellite communication network, such as channel error rate, time delay jitter and time variation, are difficult to accurately describe, the simulation process may have a large difference from the real situation, and the authenticity of the simulation is difficult to ensure. The missing of a link or even the wrong setting of a parameter will result in the simulation result of "milli-centimeter difference, thousand miles missing".
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the protocol testing method of the satellite communication simulation platform based on network virtualization is used for overcoming the defects of the prior art, constructing the satellite communication network simulation platform capable of realizing virtual-real interconnection by utilizing a network function virtualization technology, realizing dynamic deployment and operation testing of various heterogeneous protocols based on the platform and effectively reducing the testing difficulty of the satellite communication network protocol.
The technical solution of the invention is as follows:
a protocol testing method of a satellite communication simulation platform based on network virtualization comprises the following steps:
the method comprises the following steps: designing a satellite communication network simulation platform with a four-layer architecture;
the first layer is a user interface layer and is used for customizing a network topological structure, arranging a test protocol, controlling a test and outputting a result;
the second layer is a user instruction analysis layer, generates a virtual container and a link establishing instruction according to a network topological structure formulated by a user, converts a protocol arranged by the user into a uniform format instruction set, and converts a returned test result into a chart form to be presented to the user;
the third layer is a virtual satellite communication network management layer and is used for creating, configuring and destroying the satellite network nodes and the links;
the fourth layer is an operation monitoring layer, collects operation data and feeds back the operation data to the user;
step two: based on the satellite communication network simulation platform, automatically generating a network topology structure according to the number of nodes, the node distribution model and the number of links set by a user;
step three: according to protocol test requirements, configuring functions, processing capacity and link performance indexes of the satellite communication network nodes; initially, setting all parameter indexes as optimal default values, changing parameters within an effective range by a user according to actual needs, and generating a network configuration file for describing a satellite communication network based on the satellite communication network simulation platform;
step four: installing and operating a Linux kernel operating system in a computer to serve as a test operating environment, and simulating the functions of the satellite communication network equipment by adopting a Docker container technology;
step five: setting an online protocol editor, describing protocol contents by using a formatting language, and describing a time sequence relation between protocol packets by adopting event correlation;
step six: setting a universal protocol converter, uniformly converting a protocol added by a user into xml format description, storing the relation between protocol packets by adopting a petri network, and establishing a protocol finite state machine as a judgment criterion of normal protocol interaction;
step seven: after the test environment is built, a user interconnects a ground network and a virtual satellite communication network through an externally provided interface to carry out protocol interaction test;
step eight: the user interface layer acquires data transmitted by the operation monitoring layer in real time, presents a protocol interaction process in a chart form and generates a corresponding test report at the same time; when protocol interaction has an error, the error location is displayed.
Further, a topology generator is adopted to generate the relationship between nodes with specific constraints according to a topology model set by a user, namely, a network topology structure is formed.
Further, the generation of the network configuration file is divided into two steps:
(3.1) generating a network topology file for describing the connection relationship between the nodes according to the network topology structure;
and (3.2) expanding the network topology file into a formatted NFV network configuration file, and generating the NFV network according to the NFV network configuration file.
Further, the expanding the network topology file into a formatted NFV network configuration file specifically includes:
a. supplementing network related information for each connected node pair, and distributing port numbers, IP addresses/masks and MAC address parameters for two endpoints;
b. configuring a routing protocol: if the node is a router, the routing protocol related information required by the node needs to be specified.
Further, a Docker container technology is adopted to realize the simulation of the functions of the satellite communication network equipment, and the simulation method specifically comprises the following steps: creating a satellite network virtual equipment pool, wherein N containers are in a default pool, when the number of the containers is less than N, the number of the containers is 0< N < N, starting a container creation process, and adding the containers which are successfully created into the equipment pool; the virtual satellite communication network management layer selects an idle container from the virtual equipment pool according to the network configuration file, simultaneously starts corresponding functions, and establishes a connection relation and a virtual link performance index between the virtual equipment by modifying the network configuration file, so as to realize the simulation of the satellite communication network.
Furthermore, in the test process, the monitoring agent program residing in each virtual container is used for acquiring the actual protocol packet and uniformly transmitting the actual protocol packet to the operation monitoring layer, and the operation monitoring layer judges whether the protocol normally operates according to the protocol finite state machine and transmits the monitoring result to the user interface layer in real time.
Compared with the prior art, the invention has the beneficial effects that:
(1) the virtual satellite communication network testing platform is built based on the network function virtual technology, the Docker container technology is adopted, the Linux kernel of the server is directly shared, repeated loading of each container is not needed, a large amount of memory space is saved, and 100-1000 containers can be deployed on one server. Moreover, the Docker supports an incremental updating technology, when updating operation is needed, only the incremental content of the mirror image file needs to be distributed, transmitted and stored, so that the updating efficiency is greatly improved, and the virtual network deployment efficiency is further improved by adopting a container pool automatic filling technology.
(2) The invention is designed with a protocol operation monitoring function, can quickly locate errors in the operation of the protocol and effectively reduces the difficulty of protocol testing.
(3) The invention provides a test and verification platform which is low in price, easy to learn and use and has certain popularization and application values for the research of the satellite communication network related technology.
Drawings
FIG. 1 is a schematic diagram of a satellite communication network simulation platform;
FIG. 2 is a diagram of a finite state machine for TCP connection establishment;
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
According to the situation of the prior art, it is urgently needed to develop a test platform which is very close to the functions and performances of a large-scale complex real satellite communication network, and meanwhile, the platform has the excellent characteristics of easiness in deployment, easiness in use, low cost, open interface and the like, and has the following important characteristics:
1. for satellite communication networks with known communication relationships, the test platform should be able to produce networks that are topologically identical, functionally identical and perform very similarly. For a network with unknown communication relation, the test platform should approach the function and performance of a real network statistically according to the application requirements and the network scale and topological characteristics. Therefore, all virtual nodes (devices) in the satellite communication network test platform must be capable of actually running a satellite communication network protocol to carry real communication traffic.
2. The virtual nodes in the satellite communication network test platform can be configured into various virtual devices, and the virtual devices can be connected with real devices outside the platform through actual interfaces.
3. The simulated satellite communication network should be of a relatively large scale and have a construction time of less than or equal to 30 minutes. Obviously, the simulation platform should run on a powerful computing platform, and a large-scale virtual satellite communication network should be automatically deployed and completed by adopting a program control method.
4. The satellite communication network test platform environment comprises an actual ground network and a satellite communication network based on network function virtualization, wherein the satellite communication network serves as a core, and the ground network serves as an edge network. The edge network can be a set of the existing local area network/campus network or host, can be actually connected with the satellite communication network through a standard network interface, and receives and transmits packets; the interaction between hosts of different local area networks needs to be performed through a satellite communication network.
5. The satellite communication network test platform can provide visualization functions of a core network and a marginal network so as to show virtual and real network topology, network traffic distribution and performance conditions of specific parts and improve the usability of the satellite communication network test platform. The network core part topology is automatically generated based on the satellite communication network measurement rule or according to the existing information, the network edge part is generated in a manual configuration mode, and all network topology views can be manually modified, stored and reused.
6. The satellite communication network test platform can acquire required information in real time by calling a standard API (application programming interface), process and transmit the messages in time at any virtual network equipment interface, thereby providing support for specific network applications on a qualitative display and quantitative evaluation platform.
Based on the satellite communication network test platform, various satellite network communication protocols can be conveniently tested and verified, the test cost is effectively reduced, and the efficiency is improved.
The invention realizes the simulation of the functions of the satellite communication network equipment and the network transmission performance based on the network function virtualization technology, and realizes the test and verification of the application layer protocol on the basis.
The invention provides a protocol testing method of a satellite communication simulation platform based on network virtualization, which specifically comprises the following steps:
the method comprises the following steps: designing a satellite communication network simulation platform with a four-layer architecture, as shown in fig. 1;
the first layer is a user interface layer and is used for customizing a network topological structure, arranging a test protocol, controlling a test and outputting a result;
the second layer is a user instruction analysis layer, generates a virtual container and a link establishing instruction according to a network topological structure formulated by a user, converts a protocol arranged by the user into a uniform format instruction set, and converts a returned test result into a chart form to be presented to the user;
the third layer is a virtual satellite communication network management layer and is used for creating, configuring and destroying the satellite network nodes and the links;
the fourth layer is an operation monitoring layer, collects operation data and feeds back the operation data to the user;
step two: based on the satellite communication network simulation platform, automatically generating a network topology structure according to the number of nodes, the node distribution model and the number of links set by a user;
and generating the relation between the nodes with specific constraints according to a topology model set by a user by adopting a topology generator, namely forming a network topology structure. Commonly used topology generators include GT-ITM, Inet, Brite, etc., where Brite is a better performing, easy to use topology generator that can be used to generate multiple model topologies.
Step three: according to protocol test requirements, configuring functions, processing capacity and link performance indexes of the satellite communication network nodes; initially, setting all parameter indexes as optimal default values, changing parameters within an effective range by a user according to actual needs, and generating a network configuration file for describing a satellite communication network based on the satellite communication network simulation platform;
the generation of the network configuration file comprises two steps:
(3.1) generating a network topology file for describing the connection relationship between the nodes according to the network topology structure;
below is an example of an output file format for a 5-node and 10-edge topology graph. The Edge connection attribute is sequentially an Edge ID number, a source node ID number, a destination node ID number, length, time delay, bandwidth, an AS number of the source node, an AS number of the destination node and an Edge type.
Nodes：(C)
Edges:(10)
And (3.2) expanding the network topology file into a formatted NFV network configuration file, and generating the NFV network according to the NFV network configuration file. NFV: network function virtualization, Network function virtualization.
The expanding the network topology file into a formatted NFV network configuration file specifically includes:
a. supplementing network related information for each connected node pair, and distributing port numbers, IP addresses/masks and MAC address parameters for two endpoints;
b. configuring a routing protocol: if the node is a router, the routing protocol related information required by the node needs to be specified.
The algorithm for generating the NFV network according to the NFV network topology description file is as follows:
in the algorithm, the 1 st to 2 nd behaviors generate topology through a topology generator according to the selected topology model, the number of nodes, the number of edges and other parameter information, and output the topology to a topo.conf file; line 3 represents all links in the scanning topology, lines 4-6 represent that if AS of nodes at two ends of the link is the same, the link is an internal link and internal IP addresses are respectively allocated to ports where the nodes are located; lines 7-9 show that otherwise, for the external link, the external IP address is allocated to the port where the nodes at the two ends are located. Behavior 10 updates the port number used by the node; line 12 shows that a topology conversion program is executed, and a topology configuration file topo.conf is output according to a specific format by combining port IP information and topology information in topo.conf; line 13 is to execute a function CreateNet () according to the topology configuration file, and build an NFV network composed of LXCs;
step four: installing and operating a Linux kernel operating system in a computer to serve as a test operating environment, and simulating the functions of the satellite communication network equipment by adopting a Docker container technology;
the method adopts a Docker container technology to realize the simulation of the functions of the satellite communication network equipment, and specifically comprises the following steps: creating a satellite network virtual equipment pool, wherein N containers are in a default pool, when the number of the containers is less than N, the number of the containers is 0< N < N, starting a container creation process, and adding the containers which are successfully created into the equipment pool; the virtual satellite communication network management layer selects an idle container from the virtual equipment pool according to the network configuration file, simultaneously starts corresponding functions, and establishes a connection relation and a virtual link performance index between the virtual equipment by modifying the network configuration file, so as to realize the simulation of the satellite communication network.
For the hardware requirement of a PC (personal computer), a high-performance server of a multi-core CPU (Central processing Unit) with a main frequency of 3.0GHz or above has an internal memory of more than or equal to 128GB and a hard disk of more than 2TB, and runs an Fedora 30 or higher version operating system;
step five: setting an online protocol editor, wherein a user can describe protocol contents by using formatting languages such as xml, json, html and the like, and describe a time sequence relation between protocol packets by adopting event association;
step six: setting a universal protocol converter, uniformly converting a protocol added by a user into xml format description, storing the relation between protocol packets by adopting a petri network, and establishing a protocol finite state machine as a judgment criterion of normal protocol interaction;
the lower part is an xml description example of a TCP three-way handshake protocol and a corresponding finite-state machine description;
the built state machine is shown in fig. 2.
Step seven: after the test environment is built, a user interconnects a ground network and a virtual satellite communication network through an externally provided interface to carry out protocol interaction test;
in the test process, the monitoring agent program residing in each virtual container is used for acquiring the actual protocol packet and uniformly transmitting the actual protocol packet to the operation monitoring layer, and the operation monitoring layer judges whether the protocol normally operates according to the protocol finite state machine and transmits the monitoring result to the user interface layer in real time.
Step eight: the user interface layer acquires data transmitted by the operation monitoring layer in real time, presents a protocol interaction process in a chart form and generates a corresponding test report at the same time; when protocol interaction has an error, the error location is displayed.
The virtual satellite communication network testing platform is built based on the network function virtual technology, the Docker container technology is adopted, the Linux kernel of the server is directly shared, repeated loading of each container is not needed, a large amount of memory space is saved, and 100-1000 containers can be deployed on one server. Moreover, the Docker supports an incremental updating technology, when updating operation is needed, only the incremental content of the mirror image file needs to be distributed, transmitted and stored, so that the updating efficiency is greatly improved, and the virtual network deployment efficiency is further improved by adopting a container pool automatic filling technology. The protocol operation monitoring module can quickly locate errors in the operation of the protocol and effectively reduce the difficulty of protocol testing. The invention provides a test and verification platform which is low in price, easy to learn and use and has certain popularization and application values for the research of the satellite communication network related technology.
The invention is not described in detail and is within the knowledge of a person skilled in the art.
Claims (6)
1. A protocol testing method of a satellite communication simulation platform based on network virtualization is characterized by comprising the following steps:
the method comprises the following steps: designing a satellite communication network simulation platform with a four-layer architecture;
the first layer is a user interface layer and is used for customizing a network topological structure, arranging a test protocol, controlling a test and outputting a result;
the second layer is a user instruction analysis layer, generates a virtual container and a link establishing instruction according to a network topological structure formulated by a user, converts a protocol arranged by the user into a uniform format instruction set, and converts a returned test result into a chart form to be presented to the user;
the third layer is a virtual satellite communication network management layer and is used for creating, configuring and destroying the satellite network nodes and the links;
the fourth layer is an operation monitoring layer, collects operation data and feeds back the operation data to the user;
step two: based on the satellite communication network simulation platform, automatically generating a network topology structure according to the number of nodes, the node distribution model and the number of links set by a user;
step three: according to protocol test requirements, configuring functions, processing capacity and link performance indexes of the satellite communication network nodes; initially, setting all parameter indexes as optimal default values, changing parameters within an effective range by a user according to actual needs, and generating a network configuration file for describing a satellite communication network based on the satellite communication network simulation platform;
step four: installing and operating a Linux kernel operating system in a computer to serve as a test operating environment, and simulating the functions of the satellite communication network equipment by adopting a Docker container technology;
step five: setting an online protocol editor, describing protocol contents by using a formatting language, and describing a time sequence relation between protocol packets by adopting event correlation;
step six: setting a universal protocol converter, uniformly converting a protocol added by a user into xml format description, storing the relation between protocol packets by adopting a petri network, and establishing a protocol finite state machine as a judgment criterion of normal protocol interaction;
step seven: after the test environment is built, a user interconnects a ground network and a virtual satellite communication network through an externally provided interface to carry out protocol interaction test;
step eight: the user interface layer acquires data transmitted by the operation monitoring layer in real time, presents a protocol interaction process in a chart form and generates a corresponding test report at the same time; when protocol interaction has an error, the error location is displayed.
2. The protocol testing method based on the satellite communication simulation platform of the network virtualization as claimed in claim 1, wherein: and generating the relation between the nodes with specific constraints according to a topology model set by a user by adopting a topology generator, namely forming a network topology structure.
3. The protocol testing method based on the satellite communication simulation platform of the network virtualization as claimed in claim 1, wherein: the generation of the network configuration file comprises two steps:
(3.1) generating a network topology file for describing the connection relationship between the nodes according to the network topology structure;
and (3.2) expanding the network topology file into a formatted NFV network configuration file, and generating the NFV network according to the NFV network configuration file.
4. The protocol testing method based on the satellite communication simulation platform of the network virtualization as claimed in claim 3, wherein: the expanding the network topology file into a formatted NFV network configuration file specifically includes:
a. supplementing network related information for each connected node pair, and distributing port numbers, IP addresses/masks and MAC address parameters for two endpoints;
b. configuring a routing protocol: if the node is a router, the routing protocol related information required by the node needs to be specified.
5. The protocol testing method based on the satellite communication simulation platform of the network virtualization as claimed in claim 1, wherein: the method adopts a Docker container technology to realize the simulation of the functions of the satellite communication network equipment, and specifically comprises the following steps: creating a satellite network virtual equipment pool, wherein N containers are in a default pool, when the number of the containers is less than N, the number of the containers is 0< N < N, starting a container creation process, and adding the containers which are successfully created into the equipment pool; the virtual satellite communication network management layer selects an idle container from the virtual equipment pool according to the network configuration file, simultaneously starts corresponding functions, and establishes a connection relation and a virtual link performance index between the virtual equipment by modifying the network configuration file, so as to realize the simulation of the satellite communication network.
6. The protocol testing method based on the satellite communication simulation platform of the network virtualization as claimed in claim 1, wherein: in the test process, the monitoring agent program residing in each virtual container is used for acquiring the actual protocol packet and uniformly transmitting the actual protocol packet to the operation monitoring layer, and the operation monitoring layer judges whether the protocol normally operates according to the protocol finite state machine and transmits the monitoring result to the user interface layer in real time.
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| CN114745254A (en) * | 2022-06-10 | 2022-07-12 | 中国地质大学（武汉） | Time-varying inter-satellite link coloring Petri net modeling method based on function separation |
| CN115220367A (en) * | 2022-09-21 | 2022-10-21 | 北京航天驭星科技有限公司 | Virtual satellite measurement and control simulation method and device |
| CN115220367B (en) * | 2022-09-21 | 2022-12-27 | 北京航天驭星科技有限公司 | Virtual satellite measurement and control simulation method and device |
| CN115242655A (en) * | 2022-09-22 | 2022-10-25 | 鹏城实验室 | Container-based constellation network simulation method, device, equipment and storage medium |
| CN115242655B (en) * | 2022-09-22 | 2022-12-13 | 鹏城实验室 | Container-based constellation network simulation method, device, equipment and storage medium |
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