第二次SDN实验作业

SDN第二次作业

 

(一)

1.创建交换机

测试连通性:

2.搭建拓扑

3.划分VLAN

（老师healer就是211906157 忘记在lab2下做实验了）

 

 

4.主机连通性

wireshark测试抓包

 

(二)进阶

代码如下:

 

#!/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
import os


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(h1, s1, 1, 1)
    net.addLink(h2, s1, 1, 2)
    net.addLink(h3, s2, 1, 1)
    net.addLink(h4, s2, 1, 2)
    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])

    os.system(
        'ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')
    os.system(
        'ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3')
    os.system(
        'ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')
    os.system(
        'ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3')
    os.system('ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=0,actions=pop_vlan,output:1')
    os.system('ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=0,actions=pop_vlan,output:1')
    os.system('ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=1,actions=pop_vlan,output:2')
    os.system('ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=1,actions=pop_vlan,output:2')
    os.system('ovs-vsctl show')
    info('*** Post configure switches and hosts\n')

    CLI(net)
    net.stop()


if __name__ == '__main__':
    setLogLevel('info')
    myNetwork()

运行结果:

 

 

心得：

首先自己没有网络相关知识的基础，对于这个sdn的实验是蛮吃力的一件事。在做实验过程中学习了很多理解了每一步的用意。在实验过程中，总是粗心会打错命令，导致了很长时间的耗费。记忆深刻是在in-put和output值需要变化时，从mininet的links查看自己的端口并修改。最后进行抓包。还有我的虚拟机有时候总是卡顿，重启是很好的方式。这次也安装好的VMwareTools可以复制粘贴代码省了很多事情。在实验中多次请教同学，很感谢也受益匪浅。希望在接下来的实验中，也能从无到有，坚持到底，最终总能做出来，获得新的知识！