1 #!/usr/bin/env python 2  3 #from mininet.cli import CLI 4 #from mininet.link import Link 5 #from mininet.net import Mininet 6 #from mininet.node import RemoteController 7 #from mininet.trm import makeTerm 8 from mininet.topo import Topo 9 class spanning_tree( Topo ):10         def __init__( self ):11                 Topo.__init__(self)12                 host1 = self.addHost('h1')13                 host2 = self.addHost('h2')14                 host3 = self.addHost('h3')15 16                 switch1 = self.addSwitch( 's1' )17                 switch2 = self.addSwitch( 's2' )18                 switch3 = self.addSwitch( 's3' )19 20                 self.addLink(switch1, host1)21                 self.addLink(switch2, host2)22                 self.addLink(switch3, host3)23 24                 self.addLink(switch1, switch2)25                 self.addLink(switch2, switch3)26                 self.addLink(switch1, switch3)27 28 topos = {
   'mytopo': ( lambda:spanning_tree())}

 环路拓扑结构，可能造成广播风暴：

手动编写的拓扑

1 #!/usr/bin/env python 2  3 from mininet.cli import CLI 4 from mininet.node import Node 5 from mininet.link import Link 6 from mininet.net import Mininet 7 from mininet.node import RemoteController 8 from mininet.term import makeTerm 9 10 11 if '__main__' == __name__:12     net = Mininet(controller=RemoteController)13 14     c0 = net.addController('c0')15 16     s1 = net.addSwitch('s1')17     s2 = net.addSwitch('s2')18     s3 = net.addSwitch('s3')19 20     h1 = net.addHost('h1')21     h2 = net.addHost('h2')22     h3 = net.addHost('h3')23 24     Link(s1, h1)25     Link(s2, h2)26     Link(s3, h3)27 28     Link(s1, s2)29     Link(s2, s3)30     Link(s1, s3)31 32     net.build()33     c0.start()34     s1.start([c0])35     s2.start([c0])36     s3.start([c0])37 38     net.terms.append(makeTerm(c0))39     net.terms.append(makeTerm(s1))40     net.terms.append(makeTerm(s2))41     net.terms.append(makeTerm(s3))42     net.terms.append(makeTerm(h1))43     net.terms.append(makeTerm(h2))44     net.terms.append(makeTerm(h3))45 46     CLI(net)47     net.stop()

图像化生成的脚本：

#!/usr/bin/pythonfrom mininet.net import Mininetfrom mininet.node import Controller, RemoteController, OVSControllerfrom mininet.node import CPULimitedHost, Host, Nodefrom mininet.node import OVSKernelSwitch, UserSwitchfrom mininet.node import IVSSwitchfrom mininet.cli import CLIfrom mininet.log import setLogLevel, infofrom mininet.link import TCLink, Intffrom subprocess import calldef 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')    s2 = net.addSwitch('s2', cls=OVSKernelSwitch)    s1 = net.addSwitch('s1', cls=OVSKernelSwitch)    s3 = net.addSwitch('s3', cls=OVSKernelSwitch)    info( '*** Add hosts\n')    h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None)    h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None)    h3 = net.addHost('h3', cls=Host, ip='10.0.0.3', defaultRoute=None)    info( '*** Add links\n')    net.addLink(h1, s1)    net.addLink(s1, s2)    net.addLink(s1, s3)    net.addLink(s2, s3)    net.addLink(h2, s2)    net.addLink(s3, h3)    info( '*** Starting network\n')    net.build()    info( '*** Starting controllers\n')    for controller in net.controllers:        controller.start()    info( '*** Starting switches\n')    net.get('s2').start([c0])    net.get('s1').start([c0])    net.get('s3').start([c0])    info( '*** Post configure switches and hosts\n')    CLI(net)    net.stop()if __name__ == '__main__':    setLogLevel( 'info' )    myNetwork()

 

根据miniedit绘制拓扑生成的脚本：

#!/usr/bin/pythonfrom mininet.net import Mininetfrom mininet.node import Controller, RemoteController, OVSControllerfrom mininet.node import CPULimitedHost, Host, Nodefrom mininet.node import OVSKernelSwitch, UserSwitchfrom mininet.node import IVSSwitchfrom mininet.cli import CLIfrom mininet.log import setLogLevel, infofrom mininet.link import TCLink, Intffrom subprocess import calldef 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')    s10 = net.addSwitch('s10', cls=OVSKernelSwitch)    s3 = net.addSwitch('s3', cls=OVSKernelSwitch)    s14 = net.addSwitch('s14', cls=OVSKernelSwitch)    s19 = net.addSwitch('s19', cls=OVSKernelSwitch)    s4 = net.addSwitch('s4', cls=OVSKernelSwitch)    s20 = net.addSwitch('s20', cls=OVSKernelSwitch)    s9 = net.addSwitch('s9', cls=OVSKernelSwitch)    s11 = net.addSwitch('s11', cls=OVSKernelSwitch)    s12 = net.addSwitch('s12', cls=OVSKernelSwitch)    s15 = net.addSwitch('s15', cls=OVSKernelSwitch)    s1 = net.addSwitch('s1', cls=OVSKernelSwitch)    s6 = net.addSwitch('s6', cls=OVSKernelSwitch)    s5 = net.addSwitch('s5', cls=OVSKernelSwitch)    s16 = net.addSwitch('s16', cls=OVSKernelSwitch)    s17 = net.addSwitch('s17', cls=OVSKernelSwitch)    s7 = net.addSwitch('s7', cls=OVSKernelSwitch)    s2 = net.addSwitch('s2', cls=OVSKernelSwitch)    s18 = net.addSwitch('s18', cls=OVSKernelSwitch)    s8 = net.addSwitch('s8', cls=OVSKernelSwitch)    s13 = net.addSwitch('s13', cls=OVSKernelSwitch)    info( '*** Add hosts\n')    h15 = net.addHost('h15', cls=Host, ip='10.0.0.15', defaultRoute=None)    h6 = net.addHost('h6', cls=Host, ip='10.0.0.6', defaultRoute=None)    h16 = net.addHost('h16', cls=Host, ip='10.0.0.16', defaultRoute=None)    h10 = net.addHost('h10', cls=Host, ip='10.0.0.10', defaultRoute=None)    h7 = net.addHost('h7', cls=Host, ip='10.0.0.7', defaultRoute=None)    h8 = net.addHost('h8', cls=Host, ip='10.0.0.8', defaultRoute=None)    h14 = net.addHost('h14', cls=Host, ip='10.0.0.14', defaultRoute=None)    h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None)    h9 = net.addHost('h9', cls=Host, ip='10.0.0.9', defaultRoute=None)    h4 = net.addHost('h4', cls=Host, ip='10.0.0.4', defaultRoute=None)    h12 = net.addHost('h12', cls=Host, ip='10.0.0.12', defaultRoute=None)    h5 = net.addHost('h5', cls=Host, ip='10.0.0.5', defaultRoute=None)    h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None)    h11 = net.addHost('h11', cls=Host, ip='10.0.0.11', defaultRoute=None)    h3 = net.addHost('h3', cls=Host, ip='10.0.0.3', defaultRoute=None)    h13 = net.addHost('h13', cls=Host, ip='10.0.0.13', defaultRoute=None)    info( '*** Add links\n')    net.addLink(s1, s5)    net.addLink(s1, s7)    net.addLink(s1, s9)    net.addLink(s1, s11)    net.addLink(s2, s5)    net.addLink(s2, s7)    net.addLink(s2, s9)    net.addLink(s2, s11)    net.addLink(s3, s6)    net.addLink(s3, s8)    net.addLink(s3, s10)    net.addLink(s3, s12)    net.addLink(s4, s6)    net.addLink(s4, s8)    net.addLink(s4, s10)    net.addLink(s4, s12)    net.addLink(s5, s13)    net.addLink(s6, s14)    net.addLink(s6, s13)    net.addLink(s5, s14)    net.addLink(s7, s15)    net.addLink(s8, s16)    net.addLink(s8, s15)    net.addLink(s7, s16)    net.addLink(s9, s17)    net.addLink(s10, s18)    net.addLink(s10, s17)    net.addLink(s9, s18)    net.addLink(s11, s19)    net.addLink(s12, s20)    net.addLink(s12, s19)    net.addLink(s11, s20)    net.addLink(s13, h1)    net.addLink(s13, h2)    net.addLink(s14, h3)    net.addLink(s14, h4)    net.addLink(s15, h5)    net.addLink(s15, h6)    net.addLink(s16, h7)    net.addLink(s16, h8)    net.addLink(s17, h9)    net.addLink(s17, h10)    net.addLink(s18, h11)    net.addLink(s18, h12)    net.addLink(s19, h13)    net.addLink(s19, h14)    net.addLink(s20, h16)    net.addLink(s20, h15)    info( '*** Starting network\n')    net.build()    info( '*** Starting controllers\n')    for controller in net.controllers:        controller.start()    info( '*** Starting switches\n')    net.get('s10').start([])    net.get('s3').start([c0])    net.get('s14').start([])    net.get('s19').start([])    net.get('s4').start([c0])    net.get('s20').start([])    net.get('s9').start([])    net.get('s11').start([])    net.get('s12').start([])    net.get('s15').start([])    net.get('s1').start([c0])    net.get('s6').start([])    net.get('s5').start([])    net.get('s16').start([])    net.get('s17').start([])    net.get('s7').start([])    net.get('s2').start([c0])    net.get('s18').start([])    net.get('s8').start([])    net.get('s13').start([])    info( '*** Post configure switches and hosts\n')    CLI(net)    net.stop()if __name__ == '__main__':    setLogLevel( 'info' )    myNetwork()

手动编写的fat-tree拓扑结构：

#!/usr/bin/env pythonfrom mininet.cli import CLIfrom mininet.node import Nodefrom mininet.link import Linkfrom mininet.net import Mininetfrom mininet.node import RemoteControllerfrom mininet.term import makeTermif '__main__' == __name__:    net = Mininet(controller=RemoteController)    c0 = net.addController('c0')    s1 = net.addSwitch('s1')    s2 = net.addSwitch('s2')    s3 = net.addSwitch('s3')    s4 = net.addSwitch('s4')    s5 = net.addSwitch('s5')    s6 = net.addSwitch('s6')    s7 = net.addSwitch('s7')    s8 = net.addSwitch('s8')    s9 = net.addSwitch('s9')    s10 = net.addSwitch('s10')    s11 = net.addSwitch('s11')    s12 = net.addSwitch('s12')    s13 = net.addSwitch('s13')    s14 = net.addSwitch('s14')    s15 = net.addSwitch('s15')    s16 = net.addSwitch('s16')    s17 = net.addSwitch('s17')    s18 = net.addSwitch('s18')    s19 = net.addSwitch('s19')    s20 = net.addSwitch('s20')    h1 = net.addHost('h1')    h2 = net.addHost('h2')    h3 = net.addHost('h3')    h4 = net.addHost('h4')    h5 = net.addHost('h5')    h6 = net.addHost('h6')    h7 = net.addHost('h7')    h8 = net.addHost('h8')    h9 = net.addHost('h9')    h10 = net.addHost('h10')    h11 = net.addHost('h11')    h12 = net.addHost('h12')    h13 = net.addHost('h13')    h14 = net.addHost('h14')    h15 = net.addHost('h15')    h16 = net.addHost('h16')    Link(s1, s5)    Link(s1, s7)    Link(s1, s9)    Link(s1, s11)    Link(s2, s5)    Link(s2, s7)    Link(s2, s9)    Link(s2, s11)    Link(s3, s6)    Link(s3, s8)    Link(s3, s10)    Link(s3, s12)    Link(s2, s11)    Link(s4, s6)    Link(s4, s8)    Link(s4, s10)    Link(s4, s12)    Link(s5, s13)    Link(s5, s14)    Link(s6, s13)    Link(s6, s14)    Link(s7, s15)    Link(s7, s16)    Link(s8, s15)    Link(s8, s16)    Link(s9, s17)    Link(s9, s18)    Link(s10, s17)    Link(s10, s18)    Link(s11, s19)    Link(s11, s20)    Link(s12, s19)    Link(s12, s20)    s = [s13, s14, s15, s16, s17, s18, s19, s20]    h = [h1, h2, h3, h4, h5, h6, h7, h8, h9, h10, h11, h12, h13, h14, h15, h16]    j = 0    count = 0    for i in range(0, len(s)):        count = 0        while count < 2:            Link(s[i], h[j])            j += 1            count += 1    net.build()    c0.start()    s1.start([c0])    s2.start([c0])    s3.start([c0])    s4.start([c0]) #   net.terms.append(makeTerm(c0)) #   net.terms.append(makeTerm(s1)) #   net.terms.append(makeTerm(s2)) #   net.terms.append(makeTerm(s3)) #   net.terms.append(makeTerm(h1)) #   net.terms.append(makeTerm(h2)) #   net.terms.append(makeTerm(h3))    CLI(net)    net.stop()

 开源fat-tree拓扑结构：

from mininet.net import Mininetfrom mininet.node import Controller, RemoteControllerfrom mininet.cli import CLIfrom mininet.log import setLogLevel, infofrom mininet.link import Link, Intf, TCLinkfrom mininet.topo import Topofrom mininet.util import dumpNodeConnectionsimport loggingimport oslogging.basicConfig(level=logging.DEBUG)logger = logging.getLogger( __name__ )class HugeTopo(Topo):    logger.debug("Class HugeTopo")    CoreSwitchList = []    AggSwitchList = []    EdgeSwitchList = []    HostList = []    iNUMBER = 0    def __init__(self):        logger.debug("Class HugeTopo init")        iNUMBER = 4                self.iNUMBER = iNUMBER        self.iCoreLayerSwitch = iNUMBER        self.iAggLayerSwitch = iNUMBER * 2        self.iEdgeLayerSwitch = iNUMBER * 2        self.iHost = self.iEdgeLayerSwitch * 2        Topo.__init__(self)    def createTopo(self):        logger.debug("Start create Core Layer Switch")        self.createCoreLayerSwitch(self.iCoreLayerSwitch)        logger.debug("Start create Agg Layer Switch")        self.createAggLayerSwitch(self.iAggLayerSwitch)        logger.debug("Start create Edge Layer Switch")        self.createEdgeLayerSwitch(self.iEdgeLayerSwitch)        logger.debug("Satrt create Host")        self.createHost(self.iHost)    def createCoreLayerSwitch(self, NUMBER):        logger.debug("Create Core Layer")        for x in range(1, NUMBER+1):            PERFIX = "100"            if x >= int(10):                PERFIX = "10"            self.CoreSwitchList.append(self.addSwitch(PERFIX + str(x)))        def createAggLayerSwitch(self, NUMBER):                logger.debug("Create Agg Layer")                for x in range(1, NUMBER+1):                        PERFIX = "200"                        if x >= int(10):                                PERFIX = "20"                        self.AggSwitchList.append(self.addSwitch(PERFIX + str(x)))    def createEdgeLayerSwitch(self, NUMBER):                logger.debug("Create Edge Layer")                for x in range(1, NUMBER+1):                        PERFIX = "300"                        if x >= int(10):                                PERFIX = "30"                        self.EdgeSwitchList.append(self.addSwitch(PERFIX + str(x)))    def createHost(self, NUMBER):                logger.debug("Create Host")                for x in range(1, NUMBER+1):                        PERFIX = "400"                        if x >= int(10):                                PERFIX = "40"                        self.HostList.append(self.addHost(PERFIX + str(x)))        def createLink(self):        logger.debug("Create Core to Agg")        for x in range(0, self.iAggLayerSwitch, 2):            self.addLink(self.CoreSwitchList[0], self.AggSwitchList[x], bw=1000, loss=5)            self.addLink(self.CoreSwitchList[1], self.AggSwitchList[x], bw=1000, loss=5)        for x in range(1, self.iAggLayerSwitch, 2):                        self.addLink(self.CoreSwitchList[2], self.AggSwitchList[x], bw=1000, loss=5)                        self.addLink(self.CoreSwitchList[3], self.AggSwitchList[x], bw=1000, loss=5)        logger.debug("Create Agg to Edge")                for x in range(0, self.iAggLayerSwitch, 2):                        self.addLink(self.AggSwitchList[x], self.EdgeSwitchList[x], bw=100)                        self.addLink(self.AggSwitchList[x], self.EdgeSwitchList[x+1], bw=100)            self.addLink(self.AggSwitchList[x+1], self.EdgeSwitchList[x], bw=100)                        self.addLink(self.AggSwitchList[x+1], self.EdgeSwitchList[x+1], bw=100)                logger.debug("Create Edge to Host")                for x in range(0, self.iEdgeLayerSwitch):                        self.addLink(self.EdgeSwitchList[x], self.HostList[2*x])                        self.addLink(self.EdgeSwitchList[x], self.HostList[2*x+1])def enableSTP():    for x in range(1, 5):        cmd = "ovs-vsctl set Bridge %s stp_enable=true" % ("100" + str(x))        os.system(cmd)        print cmd    for x in range(1, 9):        cmd = "ovs-vsctl set Bridge %s stp_enable=true" % ("200" + str(x))                os.system(cmd)                print cmd        cmd = "ovs-vsctl set Bridge %s stp_enable=true" % ("300" + str(x))                os.system(cmd)                print cmddef iperfTest(net, topo):    logger.debug("Start iperfTest:")    h1000, h1015, h1016 = net.get(topo.HostList[0], topo.HostList[14], topo.HostList[15])            h1000.popen('iperf -s -u -i 1 > iperf_server_differentPod_result', shell=True)    h1015.popen('iperf -s -u -i 1 > iperf_server_samePod_result', shell=True)    h1016.cmdPrint('iperf -c' + h1000.IP() + ' -u -t 10 -i 1 -b 100m')    h1016.cmdPrint('iperf -c' + h1015.IP() + ' -u -t 10 -i 1 -b 100m')def pingTest(net):    logger.debug("Start Test all network")    net.pingAll()def createTopo():    logging.debug("LV1 Create HugeTopo")    topo = HugeTopo()    topo.createTopo()    topo.createLink()    logging.debug("LV1 Start Mininet")    CONTROLLER_IP = "192.168.116.128"    CONTROLLER_PORT = 6633    net = Mininet(topo=topo, link=TCLink, controller=None)    net.addController('controller', controller=RemoteController,ip=CONTROLLER_IP, port=CONTROLLER_PORT)    net.start()    logger.debug("LV1 dumpNode")    enableSTP()    dumpNodeConnections(net.hosts)            pingTest(net)    iperfTest(net, topo)            CLI(net)    net.stop()if __name__ == '__main__':    setLogLevel('info')    if os.getuid() != 0:        logger.debug("You are not root")    elif os.getuid() == 0:        createTopo()