基础要求

构建拓扑并打开pox控制器

开启POX： ./pox.py log.level --DEBUG forwarding.hub
开启主机终端mininet> xterm h2 h3
监视h2-eth0与h3-eth0



h1 ping h2,h1 ping h3,ping all,h2与h3均会同时收到数据
L2_learning模块代码流程图

开启pox，运行L2_learning


h1 ping h2,h1 ping h3均只有各自端口收到数据包

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。
SendFlowInSingle3代码
`from pox.core import core
import pox.openflow.libopenflow_01 as of
SendFlowInSingle3代码
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)![](/i/l/?n=22&i=blog/2972509/202210/2972509-20221012111302905-1072762813.png) ping通 TimeOut代码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
    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 = 2
    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)SendFlowInSingle3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() # 使用ofp_flow_mod()方法向交换机下发流表
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)`

实现十秒硬延时