【2019.11.06】SDN上机第2次作业

参考资料网址：https://www.cnblogs.com/TITIN24/p/11794970.html

利用mininet创建如下拓扑

要求拓扑支持OpenFlow 1.3协议，主机名、交换机名以及端口对应正确，请给出拓扑Mininet执行结果，展示端口连接情况

创建PY文档：

from mininet.topo import Topo

class Topo2( Topo ):

    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: Topo2() ) }

在终端内输入：

sudo mn --custom ./SDN1.py --topo mytopo --switch ovsk,protocols=OpenFlow13

使用PINGALL命令查看：

结果Results: 100% dropped

为互不连通状态

使用net命令：

在Open vSwitch下发流表

实现如下连通性要求，请逐条说明所下发的流表含义

h1 -- h4互通
h2 -- h5互通
h3 -- h6互通
其余主机不通

OVS下发流表的命令：

sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,in_port=1,actions=push_vlan:0x8100,set_field:4096-\>vlan_vid,output:4
//将主机1进入sw1的包打上vlan tag，转发端口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
//将主机2进入sw1的包打上vlan tag，转发端口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
//将主机3进入sw1的包打上vlan tag，转发端口4
sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=0,actions=pop_vlan,output:1
//将从端口4的包去除vlan tag， 并根据tag进行转发端口1
sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=1,actions=pop_vlan,output:2
//将从端口4的包去除vlan tag， 并根据tag进行转发端口2
sudo ovs-ofctl -O OpenFlow13 add-flow s1 priority=1,dl_vlan=2,actions=pop_vlan,output:3
//将从端口4的包去除vlan tag， 并根据tag进行转发端口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  
//与上面类似，将主机4进入sw2的包打上vlan tag，转发端口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
//将主机5进入sw2的包打上vlan tag，转发端口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
//将主机6进入sw2的包打上vlan tag，转发端口4
sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=0,actions=pop_vlan,output:1
//将从端口4的包去除vlan tag， 并根据tag进行转发端口1
sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=1,actions=pop_vlan,output:2
//将从端口4的包去除vlan tag， 并根据tag进行转发端口2
sudo ovs-ofctl -O OpenFlow13 add-flow s2 priority=1,dl_vlan=2,actions=pop_vlan,output:3
//将从端口4的包去除vlan tag， 并根据tag进行转发端口3