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

ovs命令

• 初始化删除交换机中所有流表
• 利用ovs命令下发vlan设置流表项
• 测试各主机连通性
  • h0与h2互通
  • h1与h3互通
  • 其余主机均不通
    

#!/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
" )
    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
" )
    TCLink( h0, switch0 )
    TCLink( h1, switch0 )
    TCLink( h2, switch1 )
    TCLink( h3, switch1 )
    TCLink( switch0, switch1 )
 
    info( "*** Configuring hosts
" )
    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 ) + '
' )
    info( str( h1 ) + '
' )
    info( str( h2 ) + '
' )
    info( str( h3 ) + '
' )
    
    info( "*** Starting network using Open vSwitch
" )
    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 )

    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 switch1.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 switch1.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')


    info( "*** Running test
" )
    h0.cmdPrint( 'ping -c 3 ' + h1.IP() )
    h0.cmdPrint( 'ping -c 3 ' + h2.IP() )
    h0.cmdPrint( 'ping -c 3 ' + h3.IP() )
    h1.cmdPrint( 'ping -c 3 ' + h0.IP() )
    h1.cmdPrint( 'ping -c 3 ' + h2.IP() )
    h1.cmdPrint( 'ping -c 3 ' + h3.IP() )
    h2.cmdPrint( 'ping -c 3 ' + h0.IP() )
    h2.cmdPrint( 'ping -c 3 ' + h1.IP() )
    h2.cmdPrint( 'ping -c 3 ' + h3.IP() )
    h3.cmdPrint( 'ping -c 3 ' + h0.IP() )
    h3.cmdPrint( 'ping -c 3 ' + h1.IP() )
    h3.cmdPrint( 'ping -c 3 ' + h2.IP() )

    
 
    info( "*** Stopping network
" )
    switch0.cmd( 'ovs-vsctl del-br dp0' )
    switch0.deleteIntfs()
    switch1.cmd( 'ovs-vsctl del-br dp1' )
    switch1.deleteIntfs()
    info( '
' )
 
if __name__ == '__main__':
    setLogLevel( 'info' )
    info( '*** Scratch network demo (kernel datapath)
' )
    Mininet.init()
    myNet()