NePA TesT: Community Network Emulator

#!/usr/bin/python

"""

Simple example of setting network and CPU parameters

NOTE: link params limit BW, add latency, and loss.

There is a high chance that pings WILL fail and that

iperf will hang indefinitely if the TCP handshake fails

to complete.

"""

from mininet.topo import Topo

from mininet.net import Mininet

from mininet.node import CPULimitedHost

from mininet.link import TCLink

from mininet.util import dumpNodeConnections

from mininet.log import setLogLevel

class SingleSwitchTopo(Topo):

    "Single switch connected to n hosts."

    def __init__(self, n=2, **opts):

        Topo.__init__(self, **opts)

        switch = self.addSwitch('s1')

        for h in range(n):

            # Each host gets 50%/n of system CPU

            host = self.addHost('h%s' % (h + 1),

                                cpu=.5 / n)

            # 10 Mbps, 5ms delay, 10% loss

            self.addLink(host, switch,

                         bw=10, delay='5ms', loss=10, use_htb=True)

def perfTest():

    "Create network and run simple performance test"

    topo = SingleSwitchTopo( n=4 )

    net = Mininet( topo=topo,

                  host=CPULimitedHost, link=TCLink,

                  autoStaticArp=True )

    net.start()

    print "Dumping host connections"

    dumpNodeConnections(net.hosts)

    print "Testing bandwidth between h1 and h4"

    h1, h4 = net.getNodeByName('h1', 'h4')

    net.iperf( ( h1, h4 ), l4Type='UDP' )

    net.stop()

if __name__ == '__main__':

    setLogLevel('info')

    perfTest()