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mininet / examples / scratchnet.py @ e113f8ed

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#!/usr/bin/python
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"""
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Build a simple network from scratch, using mininet primitives.
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This is more complicated than using the higher-level classes,
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but it exposes the configuration details and allows customization.
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For most tasks, the higher-level API will be preferable.
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"""
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from mininet.net import Mininet
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from mininet.node import Node
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from mininet.link import Link
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from mininet.log import setLogLevel, info
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from mininet.util import quietRun
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from time import sleep
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def scratchNet( cname='controller', cargs='-v ptcp:' ):
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    "Create network from scratch using Open vSwitch."
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    info( "*** Creating nodes\n" )
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    controller = Node( 'c0', inNamespace=False )
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    switch = Node( 's0', inNamespace=False )
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    h0 = Node( 'h0' )
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    h1 = Node( 'h1' )
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    info( "*** Creating links\n" )
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    Link( h0, switch )
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    Link( h1, switch )
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    info( "*** Configuring hosts\n" )
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    h0.setIP( '192.168.123.1/24' )
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    h1.setIP( '192.168.123.2/24' )
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    info( str( h0 ) + '\n' )
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    info( str( h1 ) + '\n' )
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    info( "*** Starting network using Open vSwitch\n" )
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    controller.cmd( cname + ' ' + cargs + '&' )
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    switch.cmd( 'ovs-vsctl del-br dp0' )
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    switch.cmd( 'ovs-vsctl add-br dp0' )
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    for intf in switch.intfs.values():
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        print switch.cmd( 'ovs-vsctl add-port dp0 %s' % intf )
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    # Note: controller and switch are in root namespace, and we
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    # can connect via loopback interface
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    switch.cmd( 'ovs-vsctl set-controller dp0 tcp:127.0.0.1:6633' )
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    info( '*** Waiting for switch to connect to controller' )
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    while 'is_connected' not in quietRun( 'ovs-vsctl show' ):
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        sleep( 1 )
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        info( '.' )
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    info( '\n' )
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    info( "*** Running test\n" )
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    h0.cmdPrint( 'ping -c1 ' + h1.IP() )
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    info( "*** Stopping network\n" )
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    controller.cmd( 'kill %' + cname )
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    switch.cmd( 'ovs-vsctl del-br dp0' )
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    switch.deleteIntfs()
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    info( '\n' )
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if __name__ == '__main__':
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    setLogLevel( 'info' )
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    info( '*** Scratch network demo (kernel datapath)\n' )
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    Mininet.init()
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    scratchNet()