CN114884856B - Reconfigurable network test system and method based on test function virtualization - Google Patents
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Abstract
The invention discloses a reconfigurable network test system and a method based on test function virtualization, which adopt the innovative idea of test function virtualization, and through software and hardware decoupling and test function abstraction, the test function is not dependent on special hardware any more, a three-layer flexible reconfigurable architecture of a hardware virtual layer (namely a virtual hardware resource part), a virtual test function layer and a test task arrangement layer is provided, the coupling of software and hardware is unlocked, the sharing of heterogeneous hardware resources is promoted, the transportability and expandability of a virtual test function entity are enhanced, and the rapid deployment of test tasks as required is realized.
Description
Technical Field
The invention relates to the technical field of computer networks, in particular to a reconfigurable network test system based on test function virtualization.
Background
Network testing is an important basic means for innovating network technology and developing network science. Currently, network testing is mainly done by relying on dedicated network detection instruments. The network detector mainly covers the functions of network performance detection, protocol detection, safety detection, network and application monitoring and the like.
Currently, most international network detectors are mainly based on special hardware and matched customized software to complete network function and performance tests in various scenes. The adoption of a closed mode of tightly coupling special software and hardware to customize the network detector brings about some problems: (1) the special purpose design is adopted, and the function is single; (2) the system is designed vertically, and the lateral expansibility is poor; (3) by adopting special software and hardware, the functions cannot be flexibly customized, the requirement of cloud deployment cannot be met, and the flexibility is insufficient; (4) the cost is high and the price is expensive; (5) the system is closed, and the system cannot adapt to the test requirements of new network architectures, protocols and algorithms in network science and technology research, so that the innovation of network technology is hindered.
In addition, virtualization and network security business rapidly grow, and colleges and scientific research institutes explore the increase of network system investment in the future, and new network testing markets are brought forward. However, the traditional network detector is hardware, the testing function is solidified, only a standardized protocol is supported, manual analysis is highly depended on, and the requirements of flexible, rapid and automatic large-scale testing and the requirements of scientific research such as a non-standardized novel network system architecture are difficult to meet.
As Virtualization matures, Network Functions Virtualization (NFV) has also grown. NFV is a technology in which a plurality of network functions are executed on hardware supporting virtualization in the form of software, and the plurality of network functions are completed with minimum hardware resources. Technologies typified by NFV and SDN (software defined networking) are driving network reconfiguration. One key point of reconstruction is NFV technology supported by a large number of virtualized network devices. In the face of this situation, the network test system needs to support virtualization of the test function, but at present, no effective implementation scheme exists.
Disclosure of Invention
The invention aims to provide a reconfigurable network test system and method based on test function virtualization, which realize software and hardware decoupling of test functions and have the advantages of high expandability, high flexibility, low cost and the like.
The purpose of the invention is realized by the following technical scheme:
a reconfigurable network test system based on test function virtualization is deployed in a cloud platform and comprises:
the hardware resource virtualization layer is used for virtualizing hardware resources, scheduling and managing the virtualized hardware resources and allocating corresponding resources to each virtualization test function module;
a plurality of virtualized test function modules, each virtualized test function module generated by test function virtualization;
the test function reconstruction module is used for carrying out function refinement on the virtualization test function in each virtualization test function module, dividing the virtualization test function into a plurality of functional particles and combining the functional particles into different test function components;
and the test function orchestrator is used for calling corresponding function particles and/or test function components according to the test function examples to test the network equipment to be tested.
A reconfigurable network test method based on test function virtualization comprises the following steps:
virtualizing a test function;
virtualizing hardware resources, scheduling and managing the virtualized hardware resources, and allocating corresponding resources for each virtualization test function;
the virtualization test function is subjected to function refinement, the virtualization test function is divided into a plurality of functional particles, and the functional particles are combined into different test function components;
and calling corresponding functional particles and/or test functional components according to the test function examples to test the network equipment to be tested.
According to the technical scheme provided by the invention, by adopting an innovative idea of test function virtualization, through software and hardware decoupling and test function abstraction, the test function is not dependent on special hardware any more, a three-layer flexible reconfigurable architecture of a hardware virtual layer (namely a virtual hardware resource part), a virtual test function layer and a test task arrangement layer is provided, the coupling of software and hardware is unlocked, the sharing of heterogeneous hardware resources is improved, the transportability and expandability of a virtual test function entity are enhanced, and the rapid deployment of test tasks as required is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic diagram of a reconfigurable network test system based on test function virtualization according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a virtual network device test implemented based on a virtualization test function according to an embodiment of the present invention;
FIG. 3 is a diagram of a cloud deployment architecture provided by an embodiment of the present invention;
FIG. 4 is a diagram illustrating reconfiguration and autonomic orchestration of test functions according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a virtual network function testing framework based on NFV according to an embodiment of the present invention;
fig. 6 is a flowchart of a reconfigurable network testing method based on test function virtualization according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the term "and/or" means that either or both can be achieved, for example, X and/or Y means that both cases include "X" or "Y" as well as three cases including "X and Y".
The terms "comprising," "including," "containing," "having," or other similar terms in describing these terms are to be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, process, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article of manufacture), is to be construed as including not only the particular feature explicitly listed but also other features not explicitly listed as such which are known in the art.
The reconfigurable network test system and method based on test function virtualization provided by the invention are described in detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. The examples of the present invention, in which specific conditions are not specified, were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer.
Example one
With the rapid development of cloud computing and Network Function Virtualization (NFV) technology, more and more enterprises and service providers face a great challenge to migrate network traffic from traditional physical networks to virtual networks. On the one hand, increasing user demand speeds up the deployment of these new services and enables network functions via virtualization technologies to reduce costs and operational expenses. On the other hand, the new service needs to be fully tested before formal deployment to ensure that the functions, performance, security and reliability of the application, device and new infrastructure meet the required baseline. Therefore, the invention provides a reconfigurable network test system (hereinafter referred to as virtualized network test system) based on test function virtualization in real time, which mainly comprises: test function virtualization and cloud deployment, and test function reconfiguration and autonomous deployment, wherein the test function virtualization and cloud deployment mainly mean that a test function is virtualized and deployed in a cloud platform, and the cloud platform provides a standardized interface of virtual hardware resources for the virtualized test function to call; the reconfigurable and autonomous arrangement of the test function mainly means that the function of the virtualized test function is refined, the test function is divided into a plurality of functional particles, and the functional particles are combined into a test function component; and calling corresponding functional particles and/or test functional components according to the test function examples to test the network equipment to be tested. Based on the two core parts, the virtual network test system provided by the invention mainly comprises:
the hardware resource virtualization layer is used for virtualizing hardware resources and scheduling and managing the virtualized hardware resources;
a plurality of virtualized test function modules, each virtualized test function module generated by test function virtualization;
the test function reconstruction module is used for carrying out function refinement on the virtualization test function in each virtualization test function module, dividing the virtualization test function into a plurality of functional particles and combining the functional particles into different test function components;
and the test function orchestrator is used for calling corresponding function particles and/or test function components according to the test function examples to test the network equipment to be tested.
As will be appreciated by those skilled in the art, a test function instance is a test task (or instance) set by a user, comprising a series of test items.
As shown in fig. 1, for a main framework of a reconfigurable network test system based on test function virtualization, an abstraction layer of hardware resources, i.e., a hardware resource virtualization layer (fig. 1 bottom) is established on a general hardware architecture, so as to implement automatic adaptation to different types of hardware, and provide a unified and standardized user interface to the outside, thereby implementing compatibility to hardware of different manufacturers. The test function examples (various function sets of the test system, such as 2-3 layers of line speed test functions, full protocol simulation and analysis functions and the like) access the virtualized hardware through the standardized interfaces, so that details of heterogeneous hardware operation are hidden, and the requirement of rapid and flexible deployment on the cloud is met. The method realizes the decoupling with the hardware resources, and the test function instance realizes the migration capability among different virtual layers based on the hardware resource virtualization layer. Designing a hardware resource virtualization layer, and controlling and managing computing resources, storage resources and network resources of a virtualization infrastructure; the hardware resource virtualization layer includes two functions, one is to virtualize the hardware resource, and the other is to schedule and manage the virtualized resource to meet the resource requirement of the upper layer (this function is implemented by a virtualization test function management module, which is specifically described later). A plurality of virtualization test function modules are designed to support different test tasks, each tool box in a network detection tool library in the middle part of fig. 1 is equivalent to a virtualization test function module, fig. 1 only schematically shows a part of test functions, and in practical application, a user can customize a matched virtualization test function module (which can be directly used for function test) according to test needs; and designing a test function orchestrator to realize the orchestration of test functions according to needs. The virtual network card (virtual network resources on the cloud platform) is operated by using a network API (application programming interface) provided by a cloud operating system (namely, an operating system deployed on the cloud platform), so that the cloud deployment of the virtual network test system is realized, and the detection of the virtual network equipment in the cloud facility is completed. And the depth programming of the virtualized network test system by a user is realized through an open operation interface. The method comprises the steps of constructing a detection workflow engine based on task driving, providing scripted dynamic configuration language, supporting independent arrangement and management of test functions of a virtualized network test system, realizing flexible deployment of the test functions and user detection as required through process definition, parameter analysis, component calling and task scheduling, and realizing full-process monitoring and management of test tasks through log service, error processing, process monitoring and message management.
For ease of understanding, the following description will be made in detail with respect to the two core components of the virtualized network test system.
Firstly, a test function virtualization and cloud deployment module.
In a traditional network device test, a test system is connected with a tested system, and then traffic is received, sent and counted. After the network function is virtualized, the instantiated network detection instrument cannot be directly connected with the virtual switch, the virtual router and the virtual firewall, and if the connection is established in a transfer mode, the test result loses credibility. Moreover, the performance of the virtualized device is relatively low, and the cost performance is relatively low when an entity network detection instrument is used for testing.
For the above situation, the test function virtualization is a more effective solution. In the embodiment of the invention, software with a test function is selected to be loaded in the virtualization working platform, and the virtualization working platform is deployed in the cloud platform. After virtualization, the test function can be adapted to the test of the traditional hardware network device, and can also be used for testing network devices (virtual network devices) in software forms such as NFV (network virtualization) and SDN (software defined networking).
Taking a software-form network device test (i.e. a virtual network device) as an example, as shown in fig. 2, an x86 server (a general-purpose server) and a hardware resource virtualization layer jointly form a virtualization work platform. Both NFV and test function virtualization run on this working platform. The virtual network devices such as software vSwitch (virtual switch), vruter (virtual router) and vbrs (virtual broadband access server) are tested by using software-form vtaster (here, vtaster can be understood as being composed of a virtual test function module, a test function reconfiguration module and a test function orchestrator). The virtual network equipment and the virtual network test system are connected through a mechanism provided by the virtual platform. A large amount of virtualized network functions are deployed in a cloud platform (cloud computing platform), and the virtualized network functions are also required to be deployed in a cloud manner. The network reconstructed by adopting the NFV is a support condition of cloud computing. After the test function virtualization is realized, the test function can be deployed in the cloud in the same way. That is to say, before a configured cloud platform is ready for operation, software-form testers can be deployed to various positions in the cloud platform according to test designs by using OpenStack, K8S and the like, various traffic test works are completed according to test examples, and the service carrying capacity of the cloud platform is fully evaluated before the cloud platform is on-line.
In the embodiment of the invention, the cloud deployment of the test function is realized by utilizing the virtual computing, the storage and the network resources provided by the cloud platform, and the test requirement on the virtual network equipment in the cloud facility is met. The test function virtualization scheme in the cloud computing scenario has the function of providing different network test services for different test users. And testing the variability of users and services, requiring that network detection tasks can be dynamically configured, and realizing the allocation of virtualization test functions and performances according to needs. As shown in fig. 3, the virtualization test function management module is a core component of the cloud deployment scheme, belongs to a sub-module of the hardware resource virtualization layer, and is responsible for managing the life cycle of the virtualization test function module, dynamically scheduling virtual hardware resources in the cloud platform (dynamically adjusting hardware resources of each virtualization test function module), monitoring the state of the network device to be tested, and managing a service chain in the test process; the service chain refers to a test sequence with an execution sequence formed by calling corresponding function particles and/or test function components according to a test function instance. The virtualization test function module is used for providing various virtual test services for the network equipment to be tested through a module generated by virtualizing the test function.
And secondly, testing the reconfigurable and autonomous arrangement of functions.
As the cloud becomes increasingly new infrastructure, more software and development work thereof have migrated into the cloud, and this change has led to the popularity of DevOps development; DevOps (a combination of Development and Operations) is a generic term for a set of processes, methods, and systems. One important point of this approach is that testing automation is ubiquitous. Different automatic test cases are operated in the whole process of development, test, operation and maintenance, and the original functions and performances are guaranteed not to be backed up due to the addition of new functions. All applications deployed in the cloud need to communicate, and a large part of testing them is to send various application traffic to them and observe their responses. After the virtualization network test system realizes test function virtualization, the virtualization network test system can operate in a cloud platform in a software form. In order to make the virtualized network test system more widely used in the DevOps development mode, various functions implemented inside the virtualized network test system need to be provided externally in the form of interfaces, and functions of the virtualized network test system can be integrated into an application scenario of the virtualized network test system by calling the interfaces by other programs. Such as: after one application is deployed in the cloud, a user can write a test program to test various application scenarios. At this time, various interfaces of the virtualized network test system can be called, and various scene tests are completed by using the functions of the virtualized network test system, so that the reconstruction and the autonomous arrangement of the test functions are achieved, and the composition structure of the system is shown in fig. 4.
The precondition of test function reconstruction is function refinement. The simple understanding of the function refinement is to break down the functions of the virtualized network test system into units small enough one by one. By doing so, it is convenient to integrate the test function by other programs, and assist other programs to complete larger functions. On the basis of test function granulation, some particles can be combined into common functions, an interface is provided at the same time, service is provided for the outside, the combined function particles are called test function components, and a plurality of test function components form a component library. When the larger function is completed, the test functional components can be directly selected from the component library to be directly assembled, and the system construction efficiency can be improved. The interface provided by the functional particle and the test functional component can be called by an efficient Remote Procedure Call (RPC) mode of a partial bottom layer, or by a more general REST (Representational State Transfer) mode based on RPC. The refinement of the Test function is the basis of the servizability, and the Service is called TaaS (Test as a Service), and the refined Test function is arranged autonomously. The scheme is that the functional particles or the test functional components are packaged in a container and exist in the cloud in a micro-service or server-less mode. All functions of the virtualized network test system are called by providing a uniform interface to the outside in a Web Service mode. Therefore, on one hand, the use of development, test and operation and maintenance personnel can be facilitated, the specific implementation details do not need to be known, and limited energy can be put on the implementation of business logic; on the other hand, the interface between the test and the CI/CD (continuous integration/continuous delivery) can be standardized. By realizing TaaS, service usage on demand can be realized. According to the difference of the test scenes, different functional particles and test functional components are selected, and the number of the functional particles and the test functional components can be increased or decreased according to needs, so that the maximization of the resource use efficiency is realized.
The virtual network test system provided by the embodiment of the invention adopts an innovative idea of test function virtualization, and through software and hardware decoupling and test function abstraction, the test function is not dependent on special hardware any more, a three-layer flexible reconfigurable architecture of a hardware virtual layer, a virtual test function layer and a test task arrangement layer is provided, the coupling of software and hardware is unlocked, the sharing of heterogeneous hardware resources is promoted, the transportability and expandability of a virtual test function entity are enhanced, and the rapid deployment of test tasks as required is realized. In addition, the test function virtualization is realized, so that the test service can be rapidly deployed on the cloud in a large scale, the reconfigurability of the system function enables the system to better cope with various combinations and evolutions of network forms, and different hardware can be adapted to provide services according to different scenes.
An application scenario is described as an example.
Virtual network function test based on NFV
The reconfigurable network test system based on test function virtualization provided by the embodiment of the invention can complete the function and performance test of physical and virtual network infrastructure through extensible protocol simulation and flexible high-speed flow generation. The target system can simulate routing and switching, data center Ethernet, Software Defined Network (SDN) and other network protocols, network attack flow and can support large-scale testing of diversified virtual network equipment and network functions. As shown in fig. 5, the testing framework can access a virtualized network testing system (a network card provides virtual network resources for the system) through a remote testing console and a testing management and control network (the two are access devices and networks on the user side), configure a virtual testing orchestrator (combine functional particles and/or testing functional components according to testing tasks), and autonomously complete the orchestration design of the detection services according to different testing requirements. The test was carried out based on the following four steps: (1) distributing hardware resources for different virtualization test function modules and instantiating the hardware resources; (2) setting configuration parameters of each virtualization test function module, including: protocol, load, etc.; (3) sequencing and combining according to needs by taking the test tasks as guidance; (4) virtual test service chains for a particular virtual network device or function are quickly created and deployed. And testing virtual equipment such as a virtual firewall, a virtual router, a virtual convergence gateway, a virtual SDN controller and the like by using the automatic virtual testing function of the virtual network testing system. In addition, the virtual network test system can also support the function and performance test under the interconnection scene of the virtual equipment and the physical equipment.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the above division of each functional module is only used for illustration, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the system is divided into different functional modules to complete all or part of the above described functions.
Example two
Another embodiment of the present invention further provides a reconfigurable network testing method based on test function virtualization, where the method is implemented based on the system provided in the first embodiment, as shown in fig. 6, and mainly includes:
step 1, virtualizing a test function.
Step 2, virtualizing hardware resources, scheduling and managing the virtualized hardware resources, and allocating corresponding resources for each virtualization test function;
step 3, performing function refinement on the virtualization test function, dividing the virtualization test function into a plurality of functional particles, and combining the functional particles into different test function components;
and 4, calling corresponding functional particles and/or test functional components according to the test function example to test the network equipment to be tested.
In this embodiment of the present invention, the virtualized hardware resources include: virtual computing resources, virtual storage resources and virtual network resources; the automatic adaptation with different types of hardware is realized through virtualized hardware resources, and the compatibility with hardware of different manufacturers is realized through unified standardized user interfaces.
In the embodiment of the present invention, the virtualizing the hardware resource includes: managing the life cycle of the virtualization test function, monitoring the state of the network equipment to be tested, and managing a service chain in the test process; the service chain refers to a test sequence with an execution sequence formed by calling corresponding function particles and/or test function components according to a test function instance.
In an embodiment of the present invention, the network device to be tested includes: virtual network devices and physical network devices.
The detailed technical details of each part related to the method have been described in detail in the first embodiment, and thus are not described again.
Through the above description of the embodiments, it is clear to those skilled in the art that the above embodiments can be implemented by software, and can also be implemented by software plus a necessary general hardware platform. With this understanding, the technical solutions of the embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A reconfigurable network test system based on test function virtualization is characterized in that the system is deployed in a cloud platform and comprises:
the hardware resource virtualization layer is used for virtualizing hardware resources, scheduling and managing the virtualized hardware resources and allocating corresponding resources to each virtualization test function module;
a plurality of virtualized test function modules, each virtualized test function module generated by test function virtualization;
the test function reconstruction module is used for carrying out function refinement on the virtualization test function in each virtualization test function module, dividing the virtualization test function into a plurality of functional particles and combining the functional particles into different test function components;
and the test function orchestrator is used for calling corresponding function particles and/or test function components according to the test function examples to test the network equipment to be tested.
2. The reconfigurable network test system based on test function virtualization according to claim 1, wherein the hardware resources virtualized in the hardware resource virtualization layer comprise: virtual computing resources, virtual storage resources, and virtual network resources.
3. The reconfigurable network test system based on test function virtualization according to claim 1, wherein the hardware resource virtualization layer comprises: the virtualization test function management module is used for scheduling and managing virtualized hardware resources, allocating corresponding resources for each virtualization test function module, managing the life cycle of the virtualization test function modules, monitoring the state of the network equipment to be tested, and managing a service chain in the test process; the service chain refers to a test sequence with an execution sequence formed by calling corresponding function particles and/or test function components according to a test function instance.
4. The reconfigurable network test system based on test function virtualization according to claim 1, wherein the network device under test comprises: virtual network devices and physical network devices.
5. A reconfigurable network test method based on test function virtualization is characterized by comprising the following steps:
virtualizing a test function;
virtualizing hardware resources, scheduling and managing the virtualized hardware resources, and allocating corresponding resources for each virtualization test function;
the virtualization test function is subjected to function refinement, the virtualization test function is divided into a plurality of functional particles, and the functional particles are combined into different test function components;
and calling corresponding functional particles and/or test functional components according to the test function examples to test the network equipment to be tested.
6. The reconfigurable network test method based on test function virtualization according to claim 5, wherein the virtualized hardware resources comprise: virtual computing resources, virtual storage resources and virtual network resources.
7. The reconfigurable network test method based on test function virtualization according to claim 5, wherein the step of virtualizing hardware resources comprises the following steps: managing the life cycle of the virtualization test function, monitoring the state of the network equipment to be tested, and managing a service chain in the test process; the service chain refers to a test sequence with an execution sequence formed by calling corresponding function particles and/or test function components according to a test function instance.
8. The reconfigurable network test method based on test function virtualization according to claim 5, wherein the network device under test comprises: virtual network devices and physical network devices.
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| CN114143235A (en) * | 2020-08-13 | 2022-03-04 | 中国移动通信有限公司研究院 | NFV automatic test method, device, equipment and storage medium |
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