Application of Pox Class Library in SDN (Application of Pox Class Library in SDN)

The application of POX class library in SDN SDN (Software Definition Network) is an innovative network architecture. It is separated from traditional special hardware devices from traditional special hardware devices to transplant network management and control functions into software controllers, so as to achieve centralized management andflexibility.The POX class library is a software controller, which is based on Python and is widely used in SDN. POX class library provides a rich set of API and modules for the development of control applications in the SDN network.It communicates with network devices by sending and receiving OpenFlow messages, and can control the behavior of the network according to the custom logic.POX class library supports various OpenFlow protocol versions, which can be compatible with SDN switches of various manufacturers. An important feature of the POX library is its high degree of flexibility.Developers can use Python to write control applications and use POX class libraries to process communication with network devices.This provides a great degree of freedom for developers, and can customize control logic according to the needs of the network and goals. Below is an example code that uses the SDN control application using the POX library: python from pox.core import core import pox.openflow.libopenflow_01 as of import pox.openflow.discovery as discovery log = core.getLogger() class SDNController(object): def __init__(self): # Register controller core.openflow.addListeners(self) def _handle_ConnectionUp(self, event): # Get the switch connection information switch = event.connection log.info("Switch %s connected", switch.dpid) # Set the stream meter rules flow_mod = of.ofp_flow_mod() flow_mod.match = of.ofp_match(in_port=1) flow_mod.actions.append(of.ofp_action_output(port=2)) switch.send(flow_mod) def _handle_ConnectionDown(self, event): switch = event.connection log.info("Switch %s disconnected", switch.dpid) def launch(): # Register SDNController core.registerNew(SDNController) discovery.launch() The above code is a simple SDN control application. It uses the POX class library to forward the traffic from Port 1 to Port 2.When the controller was initialized, we registered several callback functions to handle the connection and disconnection of the switch.In the switch connection event callback function, we set up a simple stream meter rule, and the flow of the port with 1 is forwarded to port 2. In addition to controlling the development of the application, we also need to perform related configuration to make the SDN network running normally.First, we need to install the POX library on the controller host.We then need to configure the switch so that it can communicate with the controller.Generally, this involves the management IP address of the switch and adding the IP address of the controller to the controller list of the switch. In summary, the POX class library is widely used in SDN.It provides strong development tools and flexibility, enabling developers to customize and control SDN networks.In addition, the POX class library also has cross -manufacturers compatibility, so it can be used with a variety of SDN switches.