編寫如下python指令碼後執行，得到與預期埠號相符的網路拓撲：
#!/usr/bin/python
#creating inernet topo
from mininet.topo import topo
from mininet.net import mininet
from mininet.node import remotecontroller,cpulimitedhost
from mininet.link import tclink
from mininet.util import dumpnodeconnections
class mytopo(topo):
def __init__(self):
#initialize topology
topo.__init__(self)
l1 = 2
l3 = 3
c =
#add core ovs
for i in range(l1):
sw = self.addswitch('s{}'.format(i+1))
#add hosts
count = 1
for sw1 in c:
for i in range(0, 3):
host = self.addhost('h{}'.format(count))
count+=1
self.addlink(sw1,host,i+1,1)
#add links
sw3=c[0]
sw4=c[1]
self.addlink(sw3,sw4,4,4)
topos =
sudo mn -custom 2.1.py --topo mytopo --switch ovsk,protocols=openflow13pingall測試主機連通性：
實現：
步驟：
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,in_port=3,actions=push_vlan:0x8100,set_field:4098-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,dl_vlan=0,actions=pop_vlan,output:1
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,dl_vlan=1,actions=pop_vlan,output:2
sudo ovs-ofctl -o openflow13 add-flow s1 priority=1,dl_vlan=2,actions=pop_vlan,output:3
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,in_port=3,actions=push_vlan:0x8100,set_field:4098-\>vlan_vid,output:4
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,dl_vlan=0,actions=pop_vlan,output:1
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,dl_vlan=1,actions=pop_vlan,output:2
sudo ovs-ofctl -o openflow13 add-flow s2 priority=1,dl_vlan=2,actions=pop_vlan,output:3
sudo ovs-ofctl -o openflow13 dump-flows s1sudo ovs-ofctl -o openflow13 dump-flows s2
輸入命令：
sudo wireshark &開啟介面，選擇s1的4埠進行抓包：
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