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

  1 from mininet.net import Mininet
  2 from mininet.node import Node
  3 from mininet.link import TCLink
  4 from mininet.log import  setLogLevel, info
  5 
  6 def myNet():
  7 
  8     "Create network from scratch using Open vSwitch."
  9  
 10     info( "*** Creating nodes\n" )
 11 
 12     switch0 = Node( ‘s0‘, inNamespace=False )
 13     switch1 = Node( ‘s1‘, inNamespace=False )
 14 
 15 
 16     h0 = Node( ‘h0‘ )
 17     h1 = Node( ‘h1‘ )
 18     h2 = Node( ‘h2‘ )
 19     h3 = Node( ‘h3‘ )
 20 
 21  
 22     info( "*** Creating links\n" )
 23 
 24     linkopts0=dict(bw=100, delay=‘1ms‘, loss=0)
 25     linkopts1=dict(bw=1,delay=‘50ms‘,loss=0)
 26 
 27     TCLink( h0, switch0, **linkopts0)
 28 
 29     TCLink( h1, switch0, **linkopts0)
 30 
 31     TCLink( h2, switch1, **linkopts0)
 32 
 33     TCLink( h3, switch1, **linkopts0)
 34 
 35     TCLink( switch0, switch1, **linkopts1)
 36 
 37 
 38     info( "*** Configuring hosts\n" )
 39 
 40     h0.setIP( ‘192.168.123.1/24‘ )
 41 
 42     h1.setIP( ‘192.168.123.2/24‘ )
 43     
 44     h2.setIP( ‘192.168.123.3/24‘ )
 45 
 46     h3.setIP( ‘192.168.123.4/24‘ )
 47 
 48     info( str( h0 ) + ‘\n‘ )
 49 
 50     info( str( h1 ) + ‘\n‘ )
 51     
 52 
 53     info( "*** Starting network using Open vSwitch\n" )
 54 
 55     switch0.cmd( ‘ovs-vsctl del-br dp0‘ )
 56 
 57     switch0.cmd( ‘ovs-vsctl add-br dp0‘ )
 58 
 59     switch1.cmd( ‘ovs-vsctl del-br dp1‘ )
 60 
 61     switch1.cmd( ‘ovs-vsctl add-br dp1‘ )
 62  
 63 
 64     for intf in switch0.intfs.values():
 65 
 66         print(intf)
 67 
 68         print(switch0.cmd( ‘ovs-vsctl add-port dp0 %s‘ % intf ))
 69 
 70  
 71 
 72     for intf in switch1.intfs.values():
 73 
 74         print(intf)
 75 
 76         print(switch1.cmd( ‘ovs-vsctl add-port dp1 %s‘ % intf ))
 77 
 78     info( " ** ovs-ofctl\n ")
 79 
 80     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3‘)
 81     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13  add-flow dp0 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3‘)
 82     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13  add-flow dp0 priority=1,dl_vlan=0,actions=pop_vlan,output:1‘)
 83     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=1,actions=pop_vlan,output:2‘)
 84 
 85     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:3‘)
 86     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:3‘)
 87     print switch0.cmd( r‘ovs-ofctl -O OpenFlow13  add-flow dp1 priority=1,dl_vlan=0,actions=pop_vlan,output:1‘)
 88     print switch0.cmd( r‘ovs-ofctl  -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=1,actions=pop_vlan,output:2‘)
 89 
 90     info( "*** Running test\n" )
 91     h0.cmdPrint( ‘ping -Q 0x10 -c 3 ‘ + h1.IP())
 92 
 93     h0.cmdPrint( ‘ping -Q 0x20 -c 3 ‘ + h2.IP())
 94 
 95     h0.cmdPrint( ‘ping -Q 0x30 -c 3 ‘ + h3.IP())
 96 
 97     h1.cmdPrint( ‘ping -Q 0x40 -c 3 ‘ + h2.IP())
 98 
 99     h1.cmdPrint( ‘ping -Q 0x50 -c 3 ‘ + h3.IP())
100 
101     h2.cmdPrint( ‘ping -Q 0x60 -c 3 ‘ + h3.IP())
102 
103 
104 
105     info( "*** Stopping network\n" )
106 
107     switch0.cmd( ‘ovs-vsctl del-br dp0‘ )
108 
109     switch0.deleteIntfs()
110 
111     switch1.cmd( ‘ovs-vsctl del-br dp1‘ )
112 
113     switch1.deleteIntfs()
114 
115 
116     info( ‘\n‘ )
117  
118 
119 if __name__ == ‘__main__‘:
120 
121     setLogLevel( ‘info‘ )
122 
123     info( ‘*** Scratch network demo (kernel datapath)\n‘ )
124 
125     Mininet.init()
126 
127     myNet()