基础作业

a) 执行 ovs-vsctl show 命令、测试 p0 和 p1 的连通性

执行ovs-vsctl show命令

p0和p1连通性测试的执行结果

b）开启 Mininet CLI 并执行 pingall、查看 OVS 流表的命令、wireshark 抓包

开启 Mininet CLI

执行 pingall

查看 OVS 流表

wireshark 抓包

进阶作业

代码部分

#!/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='10.0.0.1/24'
		)

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='10.0.0.1/24', defaultRoute=None)
h2 = net.addHost('h2', cls=Host, ip='10.0.0.2/24', defaultRoute=None)
h3 = net.addHost('h3', cls=Host, ip='10.0.0.3/24', defaultRoute=None)
h4 = net.addHost('h4', cls=Host, ip='10.0.0.4/24', defaultRoute=None)

info( '*** Add links\n')
net.addLink(h1, s1, 1, 1)
net.addLink(s1, h2, 2, 1)
net.addLink(s1, s2, 3, 3)
net.addLink(s2, h3, 1, 1)
net.addLink(s2, h4, 2, 1)

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()

执行结果