一、基础要求
1、使用 tcpdump 验证Hub模块
- h1 ping h2
- h1 ping h3
- L2_learning模块代码流程图
2、使用 tcpdump 验证Switch模块
- h1 ping h2
- h1 ping h3
二、进阶要求
- 1、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。
from pox.core import core
import pox.openflow.libopenflow_01 as of
class SendFlowInSingle3(object):
def __init__ (self):
core.openflow.addListeners(self)
def _handle_ConnectionUp(self, event):
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 = 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 = 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(SendFlowInSingle3)
- 2、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 SendFlowInSingle3(object):
def __init__(self):
core.openflow.addListeners(self)
def _handle_ConnectionUp(self, event):
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 = 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 = 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(SendFlowInSingle3)
三、个人总结
- 本次实验难度较大,尤其是阅读L2_learning模块代码,画出程序流程图部分和编写Python程序自定义一个POX模块部分。L2_learning模块代码是全英文的,对我来说阅读起来很有难度,好在通过搜索引擎的帮助,找到了其他能够读懂的版本,才完成了要求。Python部分主要问题还是对python编程的不熟悉,还需要多多练习。
- 我在运行SendPoxHardTimeOut时,发现终端一直在报错,说是进程被占用。后来发现是需要先关掉SendFlowInSingle3,再打开SendPoxHardTimeOut,它们两个进程是互斥的,不能同时运行。
- 本次实验掌握了pox控制器的使用方法,学到了POX控制器流表下发的方法,学习了Hub模板和Switch模板。