Python POX library and MININet network simulation (Combining Python Pox Class Library with Mininet Network Simulation)

The Python Pox class library is a class library for constructing SDN controllers. It provides rich functions and tools to achieve control of SDN networks.Mininet is a network simulation platform for building a virtual SDN network. It can be used to simulate the SDN network environment to build and test network topology. Combined with the Python Pox class library and MININET network simulation, the control and testing of the SDN network environment can be achieved.This combination allows developers to conduct flexible network topology construction and experiments in the virtual environment to verify the function and performance of its SDN controller. The combination of Python POX library and MININET network simulation needs to write a certain Python code and related configuration files.The following is a sample code to demonstrate how to use Python Pox to build and control the SDN network environment together with Mininet: # Import python pox class library from pox.core import core import pox.openflow.libopenflow_01 as of # Define the SDN controller class class SDNController(object): def __init__(self): # Register processing function core.openflow.addListeners(self) # The processing function of the Packet-in event def _handle_PacketIn(self, event): packet = event.parsed # To the Packet-in event, such as finding the source of the source destination address, etc. # Send Flowmod messages to switches, control the stream meter to add or modify msg = of.ofp_flow_mod() # Set the matching conditions and action to control the flow of the gauge # ... # Send message to switch event.connection.send(msg) # SDN controller object def launch(): controller = SDNController() The above code shows a simple SDN controller class, using the Python Pox class library to monitor the Packet-in event sent by the switch.After receiving the Packet-in incident, relevant processing can be performed as needed, such as finding the source destination address, sending Flowmod messages on the controller to the switch to control the behavior of the stream meter. Next, we need to use Mininet to build a virtual SDN network environment and control the switch to connect to our SDN controller.We can use Mininet's command line interface or write code to implement. The following is an example of using the MINT command line interface: 1. Start the Mininet command line interface: sudo mn --topo single,3 --controller remote 2. Manually configure the switch to connect to our SDN controller in the Mininet command line (its IP address is consistent with the POX controller): mininet> sh ovs-vsctl set-controller s1 tcp:<controller-ip>:6633 In this example, we use the MINET command line interface to create an SDN network environment with a topology structure as three hosts and a switch.Then add the switch controller through the command line.After connecting to the SDN controller, we can start testing and controlling this virtual network environment. Combined with the Python Pox class library and MININET network simulation to easily control and test the SDN network environment.By writing the Python code and related configuration files, we can build a virtual network topology, use the SDN controller to control the network, and conduct various experiments and tests.This combination is an important tool for learning and studying SDN technology, and has a wide range of application prospects in practice. Please note that the above is only one example. In practical applications, you may need to modify and adjust according to specific needs.