基础要求提交
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ovs-vsctl基础操作实践：创建OVS交换机，以ovs-xxxxxxxxx命名，其中xxxxxxxxx为本人学号。在创建的交换机上增加端口p0和p1，设置p0的端口号为100，p1的端口号为101，类型均为internal；为了避免网络接口上的地址和本机已有网络地址冲突，需要创建虚拟网络空间（参考命令netns）ns0和ns1，分别将p0和p1移入，并分别配置p0和p1端口的ip地址为190.168.1.100、192.168.1.101，子网掩码为255.255.255.0；最后测试p0和p1的连通性。
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使用Mininet搭建的SDN拓扑，如下图所示，要求支持OpenFlow 1.3协议，主机名、交换机名以及端口对应正确。
from mininet.topo import Topo class Mytopo(Topo): def __init__(self): #initilaize topology Topo.__init__(self) #add hosts h1 = self.addHost('h1') h2 = self.addHost('h2') h3 = self.addHost('h3') h4 = self.addHost('h4') #add switches s1 = self.addSwitch('s1') s2 = self.addSwitch('s2') #add links self.addLink(h1,s1,1,1) self.addLink(h2,s1,1,2) self.addLink(h3,s2,1,1) self.addLink(h4,s2,1,2) self.addLink(s1,s2,3,3) topos = {'mytopo':(lambda:Mytopo())}
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通过命令行终端输入“ovs-ofctl”命令，直接在s1和s2上添加流表，划分出所要求的VLAN。
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主机连通性要求：
- h1 – h3互通
- h2 – h4互通
- 其余主机不通
进阶要求提交
阅读SDNLAB实验使用Mininet，编写Python代码，生成（一）中的SDN拓扑，并在代码中直接使用OVS命令，做到可以直接运行Python程序完成和（一）相同的VLAN划分。
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(s1, h1, 1, 1)
net.addLink(s1, h2, 2, 1)
net.addLink(s2, h3, 1, 1)
net.addLink(s2, h4, 2, 1)
net.addLink(s1, s2, 3, 3)
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
- 这次的实验pdf给出了大部分的操作,自己只需要按照给出的步骤一步一步来就可以.本次实验中我也是第一次在linux平台上使用抓包工具
- 为了下次实验操作的便捷性,我将用到的命令都写进了shell脚本中,下一次可以直接调用shell脚本而不需要输入大量命令