实验2：Open vSwitch虚拟交换机实践

基础要求

• a) /home/用户名/学号/lab2/目录下执行ovs-vsctl show命令、以及p0和p1连通性测试的执行结果截图:
  
  
  

• b) /home/用户名/学号/lab2/目录下开启Mininet CLI并执行pingall命令的截图、上述目录下查看OVS流表的命令结果截图，wireshark抓包截图:
  
  
  
  
  

进阶要求

#!/usr/bin/env python



from mininet.net import Mininet

from mininet.node import Controller, RemoteController, OVSController

from mininet.node import CPULimitedHost, Host, Node

from mininet.node import OVSKernelSwitch, UserSwitch

from mininet.node import IVSSwitch

from mininet.cli import CLI

from mininet.log import setLogLevel, info

from mininet.link import TCLink, Intf

from subprocess import call



def myNetwork():



    net = Mininet( topo=None,

                   build=False,

                   ipBase='10.0.0.0/8')



    info( '*** Adding controller\n' )

    c0=net.addController(name='c0',

                      controller=Controller,

                      protocol='tcp',

                      port=6633)



    info( '*** Add switches\n')

    s1 = net.addSwitch('s1', cls=OVSKernelSwitch)

    s2 = net.addSwitch('s2', cls=OVSKernelSwitch)



    info( '*** Add hosts\n')

    h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None)

    h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None)

    h3 = net.addHost('h3', cls=Host, ip='10.0.0.3', defaultRoute=None)

    h4 = net.addHost('h4', cls=Host, ip='10.0.0.4', defaultRoute=None)



    info( '*** Add links\n')

    net.addLink(h3, s2)

    net.addLink(s2, h4)

    net.addLink(h1, s1)

    net.addLink(h2, s1)

    net.addLink(s1, s2)



    info( '*** Starting network\n')

    net.build()

    info( '*** Starting controllers\n')

    for controller in net.controllers:

        controller.start()



    info( '*** Starting switches\n')

    net.get('s1').start([c0])

    net.get('s2').start([c0])



    info( '*** Post configure switches and hosts\n')



    s1.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')

    s1.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')

    s1.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=0,actions=pop_vlan,output:1')

    s1.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=1,actions=pop_vlan,output:2')

    s2.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')

    s2.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')

    s2.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=0,actions=pop_vlan,output:1')

    s2.cmd('sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=1,actions=pop_vlan,output:2')

    CLI(net)

    net.stop()



if __name__ == '__main__':

    setLogLevel( 'info' )

    myNetwork()

个人总结

实验难度
按照文件一步步做下来不会太难，不过要真正理解还是花费点时间的。
实验过程遇到的困难及解决办法。
按照同理改另外一个的时候，有个数字没有改，就会找不到设备，属于是低级错误了，输命令的时候还是要仔细检查一下。
个人感想
通过这次实验能够对Open vSwitch进行基本操作；学会了通过命令行终端使用OVS命令操作Open vSwitch交换机，管理流表，通过Mininet的Python代码运行OVS命令，控制网络拓扑中的Open vSwitch交换机，收获满满！继续加油！