第三次上机作业

实验目的

在给定如上实验拓扑情况下，用vlan得到下列虚拟网段

h1--h4互通
h2--h5互通
h3--h6互通
其余主机间无法通信

实验步骤

1.创建以下拓扑（可采用任意方式）

class MyTopo( Topo ):
"Simple topology example."
 def __init__( self ):
     # Initialize topology
    Topo.__init__( self )
    # add switches and hosts  
    sw1 = self.addSwitch('s1')
    sw2 = self.addSwitch('s2')
    h1 = self.addHost('h1')
    h2 = self.addHost('h2')
    h3 = self.addHost('h3')
    h4 = self.addHost('h4')
    h5 = self.addHost('h5')
    h6 = self.addHost('h6')
    # add links
    self.addLink(h1,sw1,1,1)
    self.addLink(h2,sw1,1,2)
    self.addLink(h3,sw1,1,3)
    self.addLink(sw1,sw2,4,4)
    self.addLink(h4,sw2,1,1)
    self.addLink(h5,sw2,1,2)
    self.addLink(h6,sw2,1,3)
    topos = { 'mytopo': ( lambda: MyTopo() ) }

2.利用OVS命令下发流表，实现VLAN功能

s1:

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

s2:

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