基础要求

a)

创建OVS交换机，以ovs-032002441命名。在创建的交换机上增加端口p0和p1，设置p0的端口号为100，p1的端口号为101，类型均为internal；创建虚拟网络空间ns0和ns1，分别将p0和p1移入，并分别配置p0和p1端口的ip地址为190.168.0.100、192.168.0.101，子网掩码为255.255.255.0；最后测试p0和p1的连通性

Mininet下发流表

进阶要求

代码
` #!/usr/bin/python

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

def myNet():
"Create network from scratch using Open vSwitch."

info( "*** Creating nodes\n" )
switch1 = Node( 's1', inNamespace=False )
switch2 = Node( 's2', inNamespace=False )

h1 = Node( 'h1' )
h2 = Node( 'h2' )
h3 = Node( 'h3' )
h4 = Node( 'h4' )

info( "*** Creating links\n" )
Link( h1, switch1)
Link( h2, switch1)
Link( h3, switch2)
Link( h4, switch2)
Link( switch1, switch2)

info( "*** Configuring hosts\n" )
h1.setIP( '192.168.123.1/24' )
h2.setIP( '192.168.124.1/24' )
h3.setIP( '192.168.123.2/24' )
h4.setIP( '192.168.124.2/24' )
   
info( "*** Starting network using Open vSwitch\n" )
switch1.cmd( 'ovs-vsctl del-br dp0' )
switch1.cmd( 'ovs-vsctl add-br dp0' )

switch2.cmd( 'ovs-vsctl del-br dp1' )
switch2.cmd( 'ovs-vsctl add-br dp1' )

for intf in switch1.intfs.values():
    print (intf)
    print (switch1.cmd( 'ovs-vsctl add-port dp0 %s' % intf ))

for intf in switch2.intfs.values():
    print (intf)
    print (switch2.cmd( 'ovs-vsctl add-port dp1 %s' % intf ))

# Note: controller and switch are in root namespace, and we
# can connect via loopback interface
#switch0.cmd( 'ovs-vsctl set-controller dp0 tcp:127.0.0.1:6633' )
 
print (switch1.cmd(r'ovs-vsctl show'))

print (switch1.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'))
print (switch1.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'))
print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=0,actions=pop_vlan,output:1'))
print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp0 priority=1,dl_vlan=1,actions=pop_vlan,output:2'))

print (switch2.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'))
print (switch2.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'))
print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=0,actions=pop_vlan,output:1'))
print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=1,actions=pop_vlan,output:2'))

#switch0.cmd('tcpdump -i s0-eth0 -U -w aaa &')
#h0.cmd('tcpdump -i h0-eth0 -U -w aaa &')
info( "*** Running test\n" )
h1.cmdPrint( 'ping -c 3 ' + h3.IP() )
h2.cmdPrint( 'ping -c 3 ' + h4.IP() )
h1.cmdPrint( 'ping -c 3 ' + h4.IP() )
h2.cmdPrint( 'ping -c 3 ' + h3.IP() )

#print switch0.cmd( 'ovs-ofctl show dp0' )    
#print switch0.cmd( 'ovs-ofctl dump-tables  dp0' )
#print switch0.cmd( 'ovs-ofctl dump-ports   dp0' )
#print switch0.cmd( 'ovs-ofctl dump-flows  dp0' )
#print switch0.cmd( 'ovs-ofctl dump-aggregate  dp0' )
#print switch0.cmd( 'ovs-ofctl queue-stats dp0' )

info( "*** Stopping network\n" )
switch1.cmd( 'ovs-vsctl del-br dp0' )
switch1.deleteIntfs()
switch2.cmd( 'ovs-vsctl del-br dp1' )
switch2.deleteIntfs()
info( '\n' )

if name == 'main':
setLogLevel( 'info' )
info( '*** Scratch network demo (kernel datapath)\n' )
Mininet.init()
myNet()
`