实验5：开源控制器实践——POX

目录

• 一、基础要求
  • 1. 验证hub
  • 2. 验证switch
    • (1)h1 ping h2
    • (2)h1 ping h3
  • 3. L2_learning模板代码流程图
• 进阶要求
  • 1. SendFlowInSingle3
    • (1)代码
    • (2)运行结果
    • (3)ovs-ofctl交换机流表项截图
  • 2. SendPoxHardTime
    • (1)代码
    • (2)运行结果
    • (3)ovs-ofctl交换机流表项截图
• 心得体会

一、基础要求

1. 验证hub

(1)h1 ping h2

(2)h1 ping h3

2. 验证switch

(1)h1 ping h2

(2)h1 ping h3

3. L2_learning模板代码流程图

进阶要求

1. SendFlowInSingle3

(1)代码

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)运行结果

(3)ovs-ofctl交换机流表项截图

2. SendPoxHardTime

(1)代码

from pox.core import core
import pox.openflow.libopenflow_01 as of
from pox.openflow.of_json import *

def _handle_ConnectionUp(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.openflow.addListenerByName("ConnectionUp", _handle_ConnectionUp)

(2)运行结果

(3)ovs-ofctl交换机流表项截图

心得体会

1.刚开始运行时对pox的命令不太熟悉。
2.文档阅读比较困难，理解起来不太容易。
3.在编写SendFlowInSingle3和SendPoxHardTimeOut代码时，需要学习的API,同时要了解进程通信的知识和python实现。
4.在进阶部分2，运行阶段卡住了，到不到结果，之后看了下其他人博客，有以下操作：先运行SendFlowInSingle3，同时执行ping操作，之后执行SendPoxHardTimeOut，停止运行SendPoxHardTimeOut，再次运行运行SendFlowInSingle3,实现上次进阶一结果.
5.总体感觉这次实验偏难，有许多地方需要学习。
6.希望在后续实践中继续可以提高自己的能力。