实验五

基本要求：
1、搭建拓扑：

2、打开hub模块：

3、验证Hub模块：

4、打开switch模块：

5、验证switch模块：

6、l2流程图：

进阶1：

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)

进阶2：
先下发流表：

硬超时：

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 = 3
       msg.match.in_port = 1 
       msg.hard_timeout = 10  
       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 = of.OFPP_ALL)) 
       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 = of.OFPP_ALL))
       event.connection.send(msg)

def launch():
   core.registerNew(SendPoxHardTimeOut)