Learn about the network topology structure in the mininet library

Learn about the network topology structure in the mininet library Overview: Mininet is an open source software for building a virtual network. It can simulate the network environment between multiple hosts, switches and routers on a single computer.MININet provides a simple and easy -to -use Python API, which can easily create and manage custom network topology structures easily.This article will introduce the network topology structure in the MINET class library and provide relevant programming code and configuration examples. MININET network topology basic concept: In MINET, the network is composed of a set of hosts, switches, and routers.The host represents a computer in the real world. The switch is used to forward data packets on the network, while the router is used to forward the data packet between different subnets.By using the MINET class library, we can create and manage these network devices in a virtual environment to build a custom network topology structure. Programming code and configuration example: Below is a Python code example using the MINET class library to create a simple topology structure: python from mininet.net import Mininet from mininet.cli import CLI from mininet.link import Link, TCLink def create_topology(): net = Mininet() # 创 创 h1 = net.addHost('h1') h2 = net.addHost('h2') # 创 创 创 s1 = net.addSwitch('s1') # 创 创 link1 = net.addLink(h1, s1) link2 = net.addLink(h2, s1) net.start() # Configure IP address h1.cmd('ip addr add 10.0.0.1/24 dev h1-eth0') h2.cmd('ip addr add 10.0.0.2/24 dev h2-eth0') # Configure the default route h1.cmd('ip route add default via 10.0.0.254') h2.cmd('ip route add default via 10.0.0.254') # Open the command line interface CLI(net) net.stop() if __name__ == '__main__': create_topology() In the above code, we first introduced the necessary Mininet library.) `` `Methods added two hosts (H1 and H2) and a switch (S1).Then, we use the method to create a link between the host and the switch with the method of using the `` addlink () `` `` `` method. After the network creation and configuration were completed, we started the network using the method of `` Start () `` `` ``Next, we allocated the IP address for the host and configured the default route.Finally, we use the `` cli (net) `` `to open the command line interface of the mininet, so that it can interact in the virtual network environment. Before running the above code, MININET software has been installed, and the topology and configuration information of the virtual network is specified through the relevant command line parameters.After running the code, you will be able to view and operate the virtual network in the command line interface. in conclusion: Through the Mininet library, we can easily create and manage customized network topological structures.This article introduces the basic concept of the network topology structure in the MINET class library, and provides a tutorial containing programming code and configuration examples to help readers better understand and use the mininet library.Using MININET for network simulation and testing can help developers and network administrators better understand and evaluate the effects of network design and configuration.