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实验5:开源控制器实践——POX

(一)基本要求

  1. 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)

  

 

 

  

 

 

  1. 阅读Hub模块代码,使用 tcpdump 验证Hub模块;

 

 

 

 

 

 

  1. 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

  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。

 

 

 

 

  1. 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)

 

(三)实验总结

posted on 2022-10-20 08:10  caixai  阅读(13)  评论(0)    收藏  举报