Use the mininet library to create a virtual network environment

Use the mininet library to create a virtual network environment Abstract: MININET is a powerful tool for creating a programmable virtual network environment.This article will introduce how to use the MINET class library to create a custom network topology and explain related programming code and configuration. Introduction: With the rapid development of network technology, the construction of a programmable virtual network environment becomes more and more important.MININet, as a popular tool that helps us create a virtual network environment for experiments and testing various network applications.This article will guide readers to understand how to use the MINET class library to build a custom network topology and provide corresponding code instances and configurations. 1 Introduction The virtual network environment is an important part of computer network research and development.It allows us to build realistic network topology on the basis of physical networks in order to test and evaluate the performance and availability of network applications.Mininet is a powerful tool that helps us create multiple network devices and hosts on a single computer and simulate network traffic. 2. Install the mininet library First, we need to install a mininet library.It is a Python class library that can be installed by using the following commands: python pip install mininet After the installation is completed, we can start using the MINET class library to create a virtual network environment. 3. Create a virtual network topology We can use the MINET class library to create a variety of custom network topology.Below is a sample code that creates the simplest topology that contains switches, hosts and controllers. python from mininet.net import Mininet from mininet.node import OVSSwitch, Controller from mininet.cli import CLI def create_topology(): # E net = Mininet() # Add switch switch = net.addSwitch('s1', cls=OVSSwitch) # Add host host = net.addHost('h1') # Add controller controller = net.addController('c0', cls=Controller, ip='127.0.0.1', port=6633) # net.addLink(host, switch) # net.addLink(switch, controller) # 网 net.start() # Open the command line interface CLI(net) # Close the network net.stop() if __name__ == '__main__': create_topology() In the above code, we first introduced the required mininet library, and then defined a function Create_topology () to create virtual network topology.We use the adswitch () method to add a switch instance, add a host instance using the addhost () method, and add a controller instance with the addController () method.The link between the connection device can be performed using the Addlink () method.Finally, we start the network by calling the start () method, then open the command line interface (CLI) for interaction, and call the Stop () method to close the network after completion. 4. Run the above code To run the above code, just run the Python file.Make sure you have been installed and the necessary Python libraries are installed.When the code is running, you will see the appearing of the command line, and you can execute various commands (such as ping, iPerf, etc.) to test your custom network topology. Summarize: This article briefly introduces how to use the MINET class library to create a virtual network environment.We explained in detail the relevant code and configuration, enabling readers to understand and apply Mininet to build a custom network topology.By using Mininet, we can easily test and evaluate various network applications to speed up the process of network research and development.I hope this article will help you understand the basic usage of Mininet!