KR102168188B1 - System and method for Intent-based application to provision the virtual network infrastructure and computer readable medium storing a program of the same - Google Patents

Abstract

According to the method for provisioning a virtual network infrastructure through intent-based policy configuration according to the present invention, the operator and the subscriber can configure the network as needed independently of the underlying platform through the provided portal interface. The user interface provides a very familiar method for allowing the user to manage contract information defined in the form of an intent, thereby enhancing user convenience.

Description

A method for managing provisioning of a virtual network infrastructure through intent-based policy configuration, a computer-readable recording medium in which a program to be performed is recorded, and its manager and system (System and method for Intent-based application to provision the virtual network infrastructure) and computer readable medium storing a program of the same}

The present invention relates to a management method for applying an intent-based application program, and a network operator automatically configures an intent-based policy in all types of virtual network platforms by using a manager to which the intent application is applied. It is intended to be reflected in the virtual network.

Recently, network function virtualization technology is causing new changes in the overall network architecture, which was mainly hardware-oriented. Network Function Virtualization (NFV), that is, NFV separates the hardware and software components of the network, and virtualizes the functions of physical network facilities to create a VM (Virtual Machine) server, hardware equipped with a general-purpose processor, and cloud. It is a concept running on a Ding computer

According to this, various network devices, such as routers, load balancers, firewalls, intrusion prevention, and virtual private networks, can be implemented in software on a general server, thereby avoiding the vendor dependence of network configuration. This is because expensive dedicated equipment can be replaced with general-purpose hardware and dedicated software. Furthermore, it has the advantage of being able to quickly respond to changes in traffic as well as reducing equipment operating costs.

Meanwhile, Software Defined Networking (SDN), that is, SDN technology, is characterized by separating the functions of a complex control plane from a data plane. According to this, the complex functions of the control plane are processed with software, and the data plane performs only simple functions indicated by the control plane, such as forwarding, ignoring, and changing network packets.

By applying these technologies, it is possible to develop new network functions with software without complicated hardware constraints, and at the same time, various attempts that were not possible in the previous network structure can be made.

Although the NFV and SDN are separate technologies, they can work complementarily. This is because various network functions implemented in software by NFV can be efficiently controlled using SDN.

The technology flow is going from network technology to virtual network technology in data center, and for this, network virtualization and cloud computing technology are advanced through SDN and NFV technology. This flow has recently led to the development of an intent-based automated system, but a solution to automatically convert an intent into a policy and automatically service a user terminal in a network has not been proposed.

Korean Patent Registration No. 10-1878758 Korean Patent Registration No. 10-1275293

The present invention was devised to solve the above-described problem, and in an embodiment of the present invention, a network operator can automatically configure a policy based on an intent in all kinds of virtual network platforms and reflect this in a virtual network, Through an intent-based system, when a user terminal connects to a network, the intent is automatically converted into a policy so that the user terminal is automatically serviced on the network, so that the administrator of the virtual network can be realized.

In order to solve the above-described problems, in an embodiment of the present invention, in a method of managing provisioning of a virtual network infrastructure on a network function virtualization (NFV) system, a web portal is accessed by accessing a web portal from a user terminal. Creating an intent by defining a contract through a user interface; The intent management unit in the intent application module receives contract information input through the web portal user interface as input, requests detailed information on the virtual network configuration to the vocabulary-store, and is provided in the configuration storage unit. Mapping the architecture given in the contract table to a predefined architecture in the configuration storage unit; Receiving an intent input from a policy configuration unit and configuring the intent as a policy; Creating an intent composed of the policy as a TOSCA file and transmitting it to an orchestrator; Managing, by the orchestrator, a virtual network based on the policy; It is possible to provide a method of managing provisioning of a virtual network infrastructure through intent-based policy configuration including.

In addition, when the user terminal accesses the network, the web portal user interface allows the user terminal to define contract information defined in the form of an intent through a graphical user interface (GUI), an intent-based policy. It can provide a way to manage provisioning of virtual network infrastructure through configuration.

Furthermore, when the policy configuration unit configures the intent as a policy, the conflict management unit performs a check to ensure that the policy does not conflict, allocates, manages, and monitors resources, and updates the policy when a conflict occurs. , It is possible to provide a method of managing provisioning of virtual network infrastructure through intent-based policy configuration.

In addition, when the contract is defined in the above-described process, the contract includes contract information including single network slice support information, an architecture ID uniquely identifying a network architecture, and a QoS parameter for an up-down rate. It is possible to provide a method of managing provisioning of virtual network infrastructure through tent-based policy configuration.

Further, when the contract information is transmitted to the intent application module, the intent management unit selects a network function and creates a service graph for selecting a slice, architecture, and resource allocation for QoS information. It can provide a way to manage provisioning of virtual network infrastructure through configuration.

In particular, a virtual network infrastructure through an intent-based policy configuration that allows network information to be stored inside the vocabulary-store in the present invention, but enables network architecture to be extracted in an on-demand manner. It can provide a way to manage the provisioning of

In addition, in the vocabulary-store of the present invention, a contract table, an architecture table, a slice table, and a module table may be included.

It may be configured as a computer-readable recording medium in which a program for performing a method of managing provisioning of a virtual network infrastructure through an intent-based policy configuration according to the above-described embodiment of the present invention is recorded.

Further, in another embodiment of the present invention, as an administrator who manages provisioning of a virtual network infrastructure on a network function virtualization (NFV) system, when an intent is created by defining a contract through the web portal user interface, Receives the entered contract information as input, requests detailed information on the virtual network configuration to the vocabulary-store, and defines the architecture given in the contract table provided in the configuration storage in advance inside the configuration storage unit An intent management unit that maps to an existing architecture; A policy configuration unit configured to receive the input intent and configure the intent as a policy, make the intent composed of the policy as a TOSCA file, and transmit it to the orchestrator; And a conflict management unit configured to perform a check so that the policy does not have a conflict, and perform resource allocation, management, and monitoring, and update the policy when a conflict occurs. Including, it is possible to provide an administrator who manages the provisioning of the intent-based virtual network infrastructure.

In this case, the vocabulary-store is configured to include a contract table, an architecture table, a slice table, and a module table internally, and allows the network architecture to be extracted in an on-demand manner. It can be implemented as an administrator who manages the provisioning of the virtual network infrastructure.

In addition, in another embodiment of the present invention, on a network function virtualization (NFV) system, a web portal server; An operator terminal connecting to the virtual network platform through a web portal interface provided by accessing the web portal server; A user terminal that connects to the network through a wired/wireless communication network and inputs contract information through a web portal; and, when an intent is created by defining a contract through a web portal user interface, the input contract information is received as input, An intent management unit that requests detailed information on a virtual network configuration from a vocabulary-store, and maps an architecture given in a contract table provided in the configuration storage unit to an architecture predefined in the configuration storage unit; A policy configuration unit configured to receive the input intent and configure the intent as a policy, make the intent composed of the policy as a TOSCA file, and transmit it to the orchestrator; And a conflict management unit configured to perform a check so that the policy does not have a conflict, and perform resource allocation, management, and monitoring, and update the policy when a conflict occurs. It can be implemented as a network function virtualization system, including a manager who manages provisioning of an intent-based virtual network infrastructure.

According to an embodiment of the present invention, a network operator can automatically configure a policy based on an intent in all kinds of virtual network platforms and reflect it in a virtual network. Through an intent-based system, the user terminal When accessing to, the intent is automatically converted into a policy so that the user terminal is automatically serviced on the network, thereby automating the management of the virtual network.

According to the provisioning method of a virtual network infrastructure through an intent-based policy configuration according to an embodiment of the present invention, the operator and the subscriber can configure the network as needed independently of the underlying platform through the provided portal interface. Also, the graphic user interface provides a very familiar method for allowing the user to manage contract information defined in the form of an intent, thereby enhancing user convenience.

Furthermore, by using the application program (intent application module) according to the embodiment of the present invention, the subscribed user can easily manage the required QoS based on the subscribed contract information, and the intent collides after being converted into a policy. If there is a conflict, it is checked in advance, and when a conflict occurs, the conflict can be removed by updating the policy.

Therefore, when applying the intet-based application program according to the embodiment of the present invention, the applied policy does not impair the stability of the basic infrastructure/system, and when the system configuration is provisioned based on the intent-based policy, In order to ensure stability, the resources that make up the virtual network are continuously monitored and conflicts can be resolved.

FIG. 1 is a block diagram showing an entire system for managing provisioning of a virtual network infrastructure through an intent-based policy configuration implemented according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing the functions of each component of FIG. 1 together, and FIG. 3 is a functional flow diagram illustrating the functions of each component of FIG. 2 again for each function, and a configuration of a resource monitoring system is added.
FIG. 4 is a flowchart illustrating a method of driving a method medium for managing provisioning of a virtual network infrastructure through an intent-based policy configuration using an intent-based application program implemented according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments to be described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms.

In the present specification, the present embodiment is provided to complete the disclosure of the present invention, and to completely inform the scope of the invention to those of ordinary skill in the art to which the present invention belongs. And the invention is only defined by the scope of the claims. Thus, in some embodiments, well-known components, well-known operations, and well-known techniques have not been described in detail in order to avoid obscuring interpretation of the present invention.

The configuration provided in the embodiment of the present invention is for an intent-based application program, and when an intent application is used, network operators such as KT and SKT automatically create policies based on intents in all kinds of virtual network platforms. The main idea is to organize and reflect it in a virtual network.

FIG. 1 is a block diagram of a system configuration implementing a method for managing provisioning of a virtual network infrastructure through intent-based policy configuration implemented according to an embodiment of the present invention (hereinafter referred to as'the present invention'). I did it.

FIG. 2 is a conceptual diagram showing the functions of each component of FIG. 1 together, and FIG. 3 is a functional flow diagram illustrating the functions of each component of FIG. 2 again for each function, and a configuration of a resource monitoring system is added.

FIG. 4 is a block diagram of the system configuration of FIG. 1, illustrating a management method for provisioning a virtual network infrastructure based on the functions of each component, particularly an intent application module.

1 to 4, the present invention provides a method for managing provisioning of a virtual network infrastructure on a network function virtualization (NFV) system, in which a web portal user accesses a web portal from a user terminal. The step of creating an intent by defining a contract through the interface, and receiving the contract information input through the web portal user interface from the intent management unit in the intent application module as an input, and receiving the detailed information on the virtual network configuration (vocabulary-store), mapping the architecture given in the contract table provided in the configuration storage unit to the architecture predefined inside the configuration storage unit, receiving the intent input from the policy configuration unit and the intent Intent-based including the step of configuring a policy, creating an intent composed of the policy as a TOSCA file and transmitting it to the orchestrator, the orchestrator managing a virtual network based on the policy, It enables to provide a method for managing provisioning of virtual network infrastructure through policy configuration.

1. Contract definition and intent creation stage

In the present invention, a process of inputting contract information through the web portal user interface unit 40 by accessing the user terminal 20 to the web portal is performed. In the input of such contract information, the intent management unit 110 of the intent application module 100 to be described later can implement the intent as a policy by using it as an input signal.

The web portal user interface unit 40 allows the user terminal to define contract information defined in the form of an intent through a graphic user interface (GUI). That is, the web portal provides a graphical user interface for stakeholders such as network operators and subscribers. It allows you to define intents from a graphical user interface (GUI) to properly provision resources on the virtual network.

In this case, the definition or design process of contracts (C) is important because the contract design is very accurate and consists of the highest level information, as shown in FIG. 3, and consists of four fields as follows. Can be. Specifically, the contracts (C) may include single network slice support information (3GPP S_NSSAI), architecture ID uniquely identifying the network architecture, contract information including QoS parameters for up-down rates, and the like. have.

The architecture ID includes information such as LTE, LTE Advance, 5G, Radysis Core, and Intel Core.

When such contract information is provided to the intent application module 100 to be described later, the intent management unit 110 selects an appropriate network function and creates a service graph for selecting resource allocation for slice, architecture, and QoS information. can do.

2. Mapping step based on the input intent in the intent manager

The contract information input from the above-described user terminal receives contract information input through the web portal user interface from the intent management unit in the intent application module as input, and stores detailed information on the virtual network configuration as a vocabulary-store. ), and mapping the architecture given in the contract table provided in the configuration storage unit to the architecture predefined in the configuration storage unit.

Specifically, as shown in FIGS. 1 and 2, it is transmitted to the intent management unit 110 in the intent application module 100. The intent management unit 110 receives the subscription contract information of the user terminal 20 as an input, and basically uses the architecture given in the contracts-table, and the architecture defined in the configuration storage unit 120 (Vocabulary-store). Maps to

Furthermore, the intent management unit 110 may generate a graph, which is created using an architecture-id, a module-id, and a relation-id.

This process can be performed through interworking with the configuration storage unit 120.

The configuration storage unit 120 (Vocabulary-store) performs a function of storing network information in the storage, and enables all kinds of network architectures to be extracted in a demand method.

In particular, the configuration storage unit 120 may be configured to include a plurality of tables, which may include at least one of a contract table, an architecture table, a slice table, and a module table.

3. Policy creation through policy-configurator (130)

Thereafter, the policy-configurator 130 performs a function of automatically converting the input intent into a policy applicable to the virtual network. And, through the process of calculating the graph, it plays a role of creating a Topology and Orchestration Specification for Cloud Application (TOSCA) configuration.

That is, the policy configuration unit 130 receives the intent, configures it as a policy, creates a TOSCA file, and transmits it so that the orchestrator can manage the virtual network based on the policy.

The TOSCA aims to increase the portability of an application layer service in various cloud environments, and is a technology that specifies the topology and management procedure of the application in an XML-based language.

In the embodiment of the present invention, the TOSCA defines a meta model for defining IT services, and the meta model defines not only the structure of the service but also how to manage the service. The topology defines the structure of the service, and the topology template is composed of a number of node templates and relationship templates. The relationship template defines the topology model of a service represented by a graph with a direction. Nodes in the graph are expressed as a node template, and node templates are components that make up a service and are expressed in the form of a node type. The node type defines the properties of these components and operations for the components through the interface.

4. Conflict resolution in the conflict manager (140)

Referring to Figures 2 and 3, in parallel with implementing the bulk setting for intents and policies through the configuration of the intent management unit 110, the configuration storage unit 120, and the policy configuration unit 130 in the above-described process. , In the collision management unit 140, the virtual resource is actually allocated according to the setting and request, and the function of managing a collision for resource allocation that occurs at that time can be performed.

That is, the collision management unit 140 receives the monitored information on the virtual resource and performs a procedure for checking the collision between the network and the port and the link. After the intent is input, it is converted into a policy, and the intent is checked in advance so that there is no conflict, and when the conflict management unit 140 receives the created policy, the conflict is checked and the resource monitoring system 150 During resource allocation, management, and monitoring, policies are updated when conflicts occur.

Accordingly, the stability of the applied basic infrastructure and system is not impaired. According to the present invention, when a system configuration is provisioned based on an intent-based policy, the resources constituting the virtual network are continuously monitored to ensure stability, and conflicts are resolved.

According to the embodiment of the present invention, a policy is set based on an intent, conflict is resolved based on this, and a system configuration is provisioned based on the policy, thereby enabling the automation of virtual network management.

The intent-based application according to the present invention, that is, the function of the configuration of the intent application module, can be programmed to be provided, and in the present invention, a computer or a computer-readable recording medium in which such an application program is recorded It can be executed using a mobile communication terminal (eg, a smartphone or a tablet PC). In this case, such an application program may be installed on a hard disk of a computer, installed on a CD-ROM or a DVD-ROM, or installed on a USB memory and executed. In addition, it can be installed and executed in various playback devices.

In addition, as shown in Fig. 1, the method of managing provisioning of a virtual network infrastructure through an intent-based policy configuration in an embodiment of the present invention described above is by defining a contract through a web portal user interface. Is generated, receives the input contract information as input, requests detailed information on the virtual network configuration to the vocabulary-store 120, and configures the architecture given in the contract table provided in the configuration storage unit. An intent management unit 110 that maps to a predefined architecture inside the storage unit, receives the input intent, configures the intent as a policy, and makes the intent composed of the policy as a TOSCA file to the orchestrator. Intent application including a transmission policy configuration unit 130 and a collision management unit 140 that performs a check so that the policy does not conflict, and performs resource allocation, management, and monitoring, and updates the policy when a conflict occurs Modules can be implemented as administrators who manage provisioning of intent-based virtual network infrastructure.

Furthermore, by applying the manager who manages the provisioning of the intent-based virtual network infrastructure, the overall network functions, including the network operator terminal 10, the user terminal 20, and the web portal 30 as shown in FIG. 1 It is also possible to build a virtualization system. In this case, the operator terminal or the user terminal in the embodiment of the present invention may be a mobile communication terminal or a computer capable of wired or wireless communication (including Internet communication). In this case, the mobile communication terminal may be any one of a personal digital assistant (PDA), a smart phone or a tablet PC.

Further, the user terminal may include a wired/wireless communication unit, an audio/video (A/V) input unit, a user input unit, a sensing unit, an output unit, a memory, an interface unit, a control unit and a power supply unit. All of the above-described components are not essential and may be added or subtracted according to characteristics.

In an embodiment of the present invention, the web portal may be a medium that provides an internet browser to which a user terminal provided by a web server can access, and in software, various types such as C, C++, Java, Visual Basic, Visual C, etc. It contains program modules that are implemented through a language and perform various functions.

These web portals can be implemented using web server programs that are provided variously according to operating systems such as dos, Windows, Linux, Unix, and Macintosh on general server hardware. As representative examples, a website used in a Windows environment, Internet Information Server (IIS), and CERN, NCSA, APPACH, etc. used in a UNIX environment may be used.

In the server providing the web portal user interface provided to the web portal, a database for storing various information is built inside or outside, and the database has a storage space (hard disk or memory) of a computer system using a database management program. It means a general data structure implemented in ), which means a data storage format in which data can be searched (extracted), deleted, edited, added, etc. freely. These databases include relational database management systems such as Oracle, infomix, sybase, and DB2, or object-oriented database management systems such as gemston, orion, and O2, and excelon. excelon), Tamino, Sekaiju, etc. can be implemented according to the purpose of the present invention using an XML-only database, and appropriate fields or elements to achieve their function Can have

The communication network connecting the operator terminal, the user terminal, and the web portal is a network capable of wired and wireless communication, and a mobile communication network installed and operated by a communication company (including 3G network, 4G network, 5G network, WiBro network, LTE network), Internet Network/PSTN (Public Switched Telephone Network) network may be included.

The present invention can be represented by functional block configurations and various processing steps. These functional blocks may be implemented with various numbers of hardware or/and software configurations that perform specific functions. For example, the present invention provides integrated circuit configurations such as memory, processing, logic, and look-up tables, which can execute various functions by controlling one or more microprocessors or by other control devices. Can be adopted.

Similar to how the components of the present invention can be implemented with software programming or software elements, the present invention includes various algorithms implemented with a combination of data structures, processes, routines or other programming constructs, including C, C++ , Java, assembler, etc. may be implemented in a programming or scripting language. Functional aspects can be implemented with an algorithm running on one or more processors. In addition, the present invention may employ conventional techniques for electronic environment setting, signal processing, and/or data processing. Terms such as "mechanism", "element", "means", and "configuration" may be widely used, and are not limited to mechanical and physical configurations. The term may include a meaning of a series of routines of software in connection with a processor or the like.

As described above, the technical idea of the present invention has been described in detail in the preferred embodiment, but the preferred embodiment is for the purpose of explanation and not limitation. As such, it will be understood by those of ordinary skill in the art that various embodiments are possible through a combination of the embodiments of the present invention within the scope of the technical idea of the present invention.

10: network operator terminal 20: user terminal
30: web portal 40: web portal user interface
50: orchestrator 100: intent application module
110: intent management unit 120: configuration storage unit
130: policy configuration unit 140: conflict management unit

Claims (11)

In a method of managing provisioning of a virtual network infrastructure on a network function virtualization (NFV) system,
Generating an intent by accessing a web portal from a user terminal and defining a contract through a web portal user interface;
The intent management unit in the intent application module receives contract information input through the web portal user interface as input, requests detailed information on the virtual network configuration to the vocabulary-store, and is provided in the configuration storage unit. Mapping the architecture given in the contract table to a predefined architecture in the configuration storage unit;
Receiving an input intent and configuring the intent into a policy in a policy configuration unit;
Creating an intent composed of the policy as a TOSCA file and transmitting it to an orchestrator;
Including, the orchestrator managing a virtual network based on the policy;
When the intent is configured as a policy in the policy configuration unit,
The collision management unit performs resource allocation, management, and monitoring so that the policy does not conflict, receives monitored information on virtual resources, and checks for collisions within the network and between ports and links. Let the policy be updated,
When the contract information is transmitted to the intent application module,
In the intent management unit, a service graph for selecting a network function and resource allocation for slice, architecture, and QoS information is displayed as an architecture-id, module-id, and relation-id. A method of managing provisioning of virtual network infrastructure through intent-based policy configuration to be created by using. The method of claim 1,
When the user terminal accesses the network,
The web portal user interface allows the user terminal to define contract information defined in the form of an intent through a graphical user interface (GUI).
A method of managing provisioning of virtual network infrastructure through intent-based policy configuration. delete The method of claim 2,
If you define the above contract,
In the above contract,
Including contract information including single network slice support information, an architecture ID that uniquely identifies the network architecture, and QoS parameters for up and down rates,
A method of managing provisioning of virtual network infrastructure through intent-based policy configuration. delete The method of claim 4,
In the vocabulary-store, network information can be stored,
Allowing the network architecture to be extracted on-demand,
A method of managing provisioning of virtual network infrastructure through intent-based policy configuration. The method of claim 6,
Inside the vocabulary-store,
Consisting of contract table, architecture table, slice table and module table,
A method of managing provisioning of virtual network infrastructure through intent-based policy configuration. A computer-readable recording medium on which a program for performing a method of managing provisioning of a virtual network infrastructure through an intent-based policy configuration according to claim 1 is recorded. As an administrator who manages provisioning of virtual network infrastructure on a network function virtualization (NFV) system,
If you create an intent by defining a contract through the web portal user interface,
Receives the entered contract information as input, requests detailed information on the virtual network configuration to the vocabulary-store,
An intent management unit for mapping an architecture given in a contract table provided in the configuration storage unit to an architecture predefined in the configuration storage unit;
A policy configuration unit configured to receive the input intent and configure the intent as a policy, make the intent composed of the policy as a TOSCA file, and transmit it to the orchestrator; And
Containing; a conflict management unit that performs a check so that the policy does not have a conflict, performs resource allocation, management, and monitoring, and updates the policy when a conflict occurs,
When the intent is configured as a policy in the policy configuration unit,
The collision management unit performs resource allocation, management, and monitoring so that the policy does not conflict, receives monitored information on virtual resources, and checks for collisions within the network and between ports and links. Let the policy be updated,
When the contract information is transmitted to the intent application module,
In the intent management unit, a service graph for selecting a network function and resource allocation for slice, architecture, and QoS information is displayed as an architecture-id, module-id, and relation-id. An administrator who manages the provisioning of intent-based virtual network infrastructure to be created using The method of claim 9,
The vocabulary-store,
It is composed of contract table, architecture table, slice table and module table inside,
Allowing the network architecture to be extracted on-demand,
An administrator who manages the provisioning of intent-based virtual network infrastructure. On a network function virtualization (NFV) system,
Web portal server;
An operator terminal connecting to the virtual network platform through a web portal interface provided by accessing the web portal server;
Includes; a user terminal that accesses the network through a wired/wireless communication network and inputs contract information through a web portal,
If you create an intent by defining a contract through the web portal user interface,
Receives the entered contract information as input, requests detailed information on the virtual network configuration to the vocabulary-store,
An intent management unit for mapping an architecture given in a contract table provided in the configuration storage unit to an architecture predefined in the configuration storage unit;
A policy configuration unit configured to receive the input intent and configure the intent as a policy, make the intent composed of the policy as a TOSCA file, and transmit it to the orchestrator; And
A conflict management unit that performs a check so that the policy does not have a conflict, and performs resource allocation, management, and monitoring, and updates the policy when a conflict occurs;
Including,
When the intent is configured as a policy in the policy configuration unit,
The collision management unit performs resource allocation, management, and monitoring so that the policy does not conflict, receives monitored information on virtual resources, and checks for collisions within the network and between ports and links. Let the policy be updated,
When the contract information is transmitted to the intent application module,
In the intent management unit, a service graph for selecting a network function and resource allocation for slice, architecture, and QoS information is displayed as an architecture-id, module-id, and relation-id. Including an administrator who manages the provisioning of an intent-based virtual network infrastructure to be created using,
Network function virtualization system.

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