实验5:开源控制器实践——POX
(一)基本要求
- 搭建下图所示SDN拓扑,协议使用Open Flow 1.0,控制器使用部署于本地的POX(默认监听6633端口)
- 阅读Hub模块代码,使用 tcpdump 验证Hub模块;
- 阅读L2_learning模块代码,画出程序流程图,使用 tcpdump 验证Switch模块。
H3动 h2不动
H2动h3不动
(二)进阶要求
- 重新搭建(一)的拓扑,此时交换机内无流表规则,拓扑内主机互不相通;编写Python程序自定义一个POX模块SendFlowInSingle3,并且将拓扑连接至SendFlowInSingle3(默认端口6633),实现向s1发送流表规则使得所有主机两两互通。
- 基于进阶1的代码,完成ODL实验的硬超时功能。
from pox.core import core import pox.openflow.libopenflow_01 as of class SendPoxHardTimeOut(object): def __init__(self): core.openflow.addListeners(self) def _handle_ConnectionUp(self, event): msg = of.ofp_flow_mod() msg.priority = 2 msg.match.in_port = 1 msg.hard_timeout = 10 #硬超时10秒 event.connection.send(msg) msg = of.ofp_flow_mod() msg.priority = 1 msg.match.in_port = 1 msg.actions.append(of.ofp_action_output(port = 2)) msg.actions.append(of.ofp_action_output(port = 3)) event.connection.send(msg) msg = of.ofp_flow_mod() msg.priority = 2 msg.match.in_port = 2 msg.hard_timeout = 10 event.connection.send(msg) msg = of.ofp_flow_mod() msg.priority = 1 msg.match.in_port = 2 msg.actions.append(of.ofp_action_output(port = 1)) msg.actions.append(of.ofp_action_output(port = 3)) event.connection.send(msg) msg = of.ofp_flow_mod() msg.priority = 3 msg.match.in_port = 3 msg.hard_timeout = 10 event.connection.send(msg) msg = of.ofp_flow_mod() msg.priority = 1 msg.match.in_port = 3 msg.actions.append(of.ofp_action_output(port = 1)) msg.actions.append(of.ofp_action_output(port = 2)) event.connection.send(msg) def launch(): core.registerNew(SendPoxHardTimeOut)