sdn

 #!/usr/bin/env python

 #from mininet.cli import CLI

 #from mininet.link import Link

 #from mininet.net import Mininet

 #from mininet.node import RemoteController

 #from mininet.trm import makeTerm

 from mininet.topo import Topo

 class spanning_tree( Topo ):

         def __init__( self ):

                 Topo.__init__(self)

                 host1 = self.addHost('h1')

                 host2 = self.addHost('h2')

                 host3 = self.addHost('h3')

                 switch1 = self.addSwitch( 's1' )

                 switch2 = self.addSwitch( 's2' )

                 switch3 = self.addSwitch( 's3' )

                 self.addLink(switch1, host1)

                 self.addLink(switch2, host2)

                 self.addLink(switch3, host3)

                 self.addLink(switch1, switch2)

                 self.addLink(switch2, switch3)

                 self.addLink(switch1, switch3)

 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

 #!/usr/bin/env python

 from mininet.cli import CLI

 from mininet.node import Node

 from mininet.link import Link

 from mininet.net import Mininet

 from mininet.node import RemoteController

 from mininet.term import makeTerm

 if '__main__' == __name__:

     net = Mininet(controller=RemoteController)

     c0 = net.addController('c0')

     s1 = net.addSwitch('s1')

     s2 = net.addSwitch('s2')

     s3 = net.addSwitch('s3')

     h1 = net.addHost('h1')

     h2 = net.addHost('h2')

     h3 = net.addHost('h3')

     Link(s1, h1)

     Link(s2, h2)

     Link(s3, h3)

     Link(s1, s2)

     Link(s2, s3)

     Link(s1, s3)

     net.build()

     c0.start()

     s1.start([c0])

     s2.start([c0])

     s3.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()

图像化生成的脚本：

#!/usr/bin/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='10.0.0.0/8')

    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/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='10.0.0.0/8')

    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 python

from mininet.cli import CLI

from mininet.node import Node

from mininet.link import Link

from mininet.net import Mininet

from mininet.node import RemoteController

from mininet.term import makeTerm

if '__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 Mininet

from mininet.node import Controller, RemoteController

from mininet.cli import CLI

from mininet.log import setLogLevel, info

from mininet.link import Link, Intf, TCLink

from mininet.topo import Topo

from mininet.util import dumpNodeConnections

import logging

import os

logging.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 = ""

            if x >= int(10):

                PERFIX = ""

            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 = ""

                        if x >= int(10):

                                PERFIX = ""

                        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 = ""

                        if x >= int(10):

                                PERFIX = ""

                        self.EdgeSwitchList.append(self.addSwitch(PERFIX + str(x)))

    def createHost(self, NUMBER):

                logger.debug("Create Host")

                for x in range(1, NUMBER+1):

                        PERFIX = ""

                        if x >= int(10):

                                PERFIX = ""

                        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" % ("" + str(x))

        os.system(cmd)

        print cmd

    for x in range(1, 9):

        cmd = "ovs-vsctl set Bridge %s stp_enable=true" % ("" + str(x))

                os.system(cmd)

                print cmd

        cmd = "ovs-vsctl set Bridge %s stp_enable=true" % ("" + str(x))

                os.system(cmd)

                print cmd

def 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()

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