new1.py for 3 path and 2 host_net.addswitch openflow13-优快云博客

该博客介绍了如何利用Mininet创建一个包含多个OVSKernelSwitch的OpenFlow网络，并设置远程控制器进行管理。网络中包含了多个主机和交换机，并配置了带宽和延迟的链路。同时，通过多线程模拟了链路故障和恢复的场景，展示了网络的动态调整能力。

#!/usr/bin/python
import sys
sys.path.append('/home/openlab/mininet/')
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 threading
import time

def myNetwork():
    net = Mininet( topo=None,controller=None,ipBase='10.0.0.0/8')
    
    ## specify clearly to use a remote controller instead of the default one 
    c=RemoteController('c','0.0.0.0',6633)
    net.addController(c)

    info( '*** Add switches\n')
    s1 = net.addSwitch('s1', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s2 = net.addSwitch('s2', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s3 = net.addSwitch('s3', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s4 = net.addSwitch('s4', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s5 = net.addSwitch('s5', cls=OVSKernelSwitch,protocols=['OpenFlow13'])

    s6 = net.addSwitch('s6', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s7 = net.addSwitch('s7', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s8 = net.addSwitch('s8', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
    s9 = net.addSwitch('s9', cls=OVSKernelSwitch,protocols=['OpenFlow13'])
 
    info( '*** Add hosts\n')
    h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None,mac='00:00:00:00:00:01')
    h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None,mac='00:00:00:00:00:02')

    
    info( '*** Add links\n')
    net.addLink(h1, s1)
    net.addLink(h2, s5)

    net.addLink(s1, s2,bw=10, delay='1ms')
    net.addLink(s1, s4,bw=10, delay='1ms')
    #net.addLink(s2, s3,bw=10, delay='1ms')
    #net.addLink(s4, s5,bw=10, delay='1ms')
    net.addLink(s3, s5,bw=10, delay='1ms')

    net.addLink(s1, s6,bw=10, delay='1ms')
    net.addLink(s6, s7,bw=10, delay='1ms')
    net.addLink(s7, s8,bw=10, delay='1ms')
    net.addLink(s8, s9,bw=10, delay='1ms')
    net.addLink(s5, s9,bw=10, delay='1ms')


    ## start switch
    for i in range(1,10):
        net.get("s{}".format(i)).start([])

    info( '*** Starting network\n')
    net.start()

    #into the interactive mode
    def thread1():
        CLI(net)
        net.stop()

    t1 = threading.Thread(target = thread1)
    t1.start()
    def thread2():#kill s1 s4;s2 s3
        time.sleep(15)
        j=0
        k=3
        net.configLinkStatus('s' + str(int(j+1)),'s' + str(int(k+1)),'down')
        net.configLinkStatus('s' + str(int(2)),'s' + str(int(2+1)),'down')        

    t2 = threading.Thread(target = thread2)
    t2.start()

    def thread3():#up s1 s4;s2 s3
        time.sleep(30)
        j=0
        k=3
        net.configLinkStatus('s' + str(int(j+1)),'s' + str(int(k+1)),'up')
        net.configLinkStatus('s' + str(int(2)),'s' + str(int(2+1)),'up')
        #add()    

    t3 = threading.Thread(target = thread3)
    t3.start()

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