SDN第三次上机作业

1.创建拓扑

代码：

#!/usr/bin/python

from mininet.topo import Topo

class topo2(Topo):

    def __init__(self):
        Topo.__init__(self)

        switchs = []

        for i in range(2):
            sw = self.addSwitch("s{}".format(i + 1))
            switchs.append(sw)

        self.addLink(switchs[0], switchs[1])

        id = 1
        for sw in switchs:
            for i in range(3):
                h = self.addHost("h{}".format(id))
                self.addLink(sw, h)
                id += 1


topos = {"topo2": (lambda : topo2()) }

2.利用OVS命令下发流表，实现VLAN功能

对s1下流表：

zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=3,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=4,actions=push_vlan:0x8100,set_field:4098-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=2,actions=pop_vlan,output=4
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=1,actions=pop_vlan,output=3
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=0,actions=pop_vlan,output=2
zhangsihuai@ubuntu:~$

对s2下流表：

zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=4,actions=push_vlan:0x8100,set_field:4098-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=3,actions=push_vlan:0x8100,set_field:4097-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,in_port=2,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:1
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=0,actions=pop_vlan,output=2
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=1,actions=pop_vlan,output=3
zhangsihuai@ubuntu:~$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=2,actions=pop_vlan,output=4