Open vSwitch虚拟交换机实践

实验2：Open vSwitch虚拟交换机实践

2.a)

执行ovs-vsctl show命令

p0和p1连通性测试

2.b)

开启Mininet CLI并执行pingall命令

查看ovs流表
s1的流表

s2的流表

wireshark抓包截图

3.进阶

代码

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( '192.168.123.2/24' )
    h3.setIP( '192.168.123.3/24' )
    h4.setIP( '192.168.123.4/24' )
    
    switch1.cmd( 'ovs-vsctl del-br dp1' )
    switch1.cmd( 'ovs-vsctl add-br dp1' )
    switch2.cmd( 'ovs-vsctl del-br dp2' )
    switch2.cmd( 'ovs-vsctl add-br dp2' )
    
    for intf in switch1.intfs.values():
        print (intf)
        print (switch1.cmd( 'ovs-vsctl add-port dp1 %s' % intf ))
 
    for intf in switch2.intfs.values():
        print (intf)
        print (switch2.cmd( 'ovs-vsctl add-port dp2 %s' % intf ))
    print (switch1.cmd(r'ovs-vsctl show'))
    print (switch2.cmd(r'ovs-vsctl show'))
        
    print (switch1.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 (switch1.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 (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=0,actions=pop_vlan,output:1'))
    print (switch1.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp1 priority=1,dl_vlan=1,actions=pop_vlan,output:2'))

    print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp2 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 dp2 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 dp2 priority=1,dl_vlan=0,actions=pop_vlan,output:1'))
    print (switch2.cmd(r'ovs-ofctl -O OpenFlow13 add-flow dp2 priority=1,dl_vlan=1,actions=pop_vlan,output:2'))

    
    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() )
    
    info( "*** Stopping network\n" )
    switch1.cmd( 'ovs-vsctl del-br dp1' )
    switch1.deleteIntfs()
    switch2.cmd( 'ovs-vsctl del-br dp2' )
    switch2.deleteIntfs()
    
    info( '\n' )
 
if __name__ == '__main__':
    setLogLevel( 'info' )
    info( '*** Scratch network demo (kernel datapath)\n' )
    Mininet.init()
    myNet()

执行结果

结果1

结果2

结果3

4.个人总结

实验难度
本次实验新学了ovs基础操作、抓包等功能，对sdn的理解又多了一点，
还需继续努力，多学新知识