实验 4：Open vSwitch 实验——Mininet 中使用 OVS 命令

#!/usr/bin/python

from mininet.net import Mininet
from mininet.node import Node
from mininet.link import TCLink
from mininet.log import  setLogLevel, info

 

def myNet():

    "Create network from scratch using Open vSwitch."

    info( "*** Creating nodes\n" )
    switch0 = Node( ‘s0‘, inNamespace=False )
    switch1 = Node( ‘s1‘, inNamespace=False )
    h0 = Node( ‘h0‘ )
    h1 = Node( ‘h1‘ )
    h2 = Node( ‘h2‘ )
    h3 = Node( ‘h3‘ )


    info( "*** Creating links\n" )
    linkopts0=dict(bw=100, delay=‘1ms‘, loss=0)
    linkopts1=dict(bw=1,delay=‘100ms‘,loss=0)
    TCLink( h0, switch0, **linkopts0)
    TCLink( h1, switch0, **linkopts0)
    TCLink( h2, switch1, **linkopts0)
    TCLink( h3, switch1, **linkopts0)
    TCLink( switch0, switch1, **linkopts1)

    info( "*** Configuring hosts\n" )
    h0.setIP( ‘192.168.123.1/24‘ )
    h1.setIP( ‘192.168.123.2/24‘ )
    h2.setIP( ‘192.168.123.3/24‘ )
    h3.setIP( ‘192.168.123.4/24‘ )
    info( str( h0 ) + ‘\n‘ )
    info( str( h1 ) + ‘\n‘ )
       
    info( "*** Starting network using Open vSwitch\n" )
    switch0.cmd( ‘ovs-vsctl del-br dp0‘ )
    switch0.cmd( ‘ovs-vsctl add-br dp0‘ )
    switch1.cmd( ‘ovs-vsctl del-br dp1‘ )
    switch1.cmd( ‘ovs-vsctl add-br dp1‘ )

    for intf in switch0.intfs.values():
        print(intf)
        print(switch0.cmd( ‘ovs-vsctl add-port dp0 %s‘ % intf ))

    for intf in switch1.intfs.values():
        print(intf)
        print(switch1.cmd( ‘ovs-vsctl add-port dp1 %s‘ % intf ))


    info( " ** ovs-ofctl\n ")

    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3‘))
    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13  add-flow dp0 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3‘))
    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13  add-flow dp0 priority=1,dl_vlan=0,actions=pop_vlan,output:1‘))
    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=1,actions=pop_vlan,output:2‘))

    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3‘))
    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3‘))
    print(switch0.cmd( ‘ovs-ofctl -O OpenFlow13  add-flow dp1 priority=1,dl_vlan=0,actions=pop_vlan,output:1‘))
    print(switch0.cmd( ‘ovs-ofctl  -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=1,actions=pop_vlan,output:2‘))


    h0.cmdPrint( ‘ping -Q 0x10 -c 3 ‘ + h1.IP() )
    h0.cmdPrint( ‘ping -Q 0x20 -c 3 ‘ + h2.IP() )
    h0.cmdPrint( ‘ping -Q 0x30 -c 3 ‘ + h3.IP() )
    h1.cmdPrint( ‘ping -Q 0x40 -c 3 ‘ + h2.IP())
    h1.cmdPrint( ‘ping -Q 0x50 -c 3 ‘ + h3.IP())
    h2.cmdPrint( ‘ping -Q 0x60 -c 3 ‘ + h3.IP())


    info( "*** Stopping network\n" )
    switch0.cmd( ‘ovs-vsctl del-br dp0‘ )
    switch0.deleteIntfs()
    switch1.cmd( ‘ovs-vsctl del-br dp1‘ )
    switch1.deleteIntfs()
    info( ‘\n‘ )

 

if __name__ == ‘__main__‘:
    setLogLevel( ‘info‘ )
    info( ‘*** Scratch network demo (kernel datapath)\n‘ )
    Mininet.init()
    myNet()