• 2019 SDN第二次上机作业


    1. 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

    使用python代码创建拓扑

    网络信息:

    连接情况:

    python代码如下:

    from mininet.topo import Topo
     
    class Topo2( Topo ):
     
        def __init__( self ):
            Topo.__init__( self )
            s1 = self.addSwitch('s1')
            s2 = 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')
            self.addLink(h1,s1,1,1)
            self.addLink(h2,s1,1,2)
            self.addLink(h3,s1,1,3)
            self.addLink(h4,s2,1,1)
            self.addLink(h5,s2,1,2)
            self.addLink(h6,s2,1,3)
    	self.addLink(s1,s2,4,4)
    topos = { 'mytopo': ( lambda: Topo2() ) }
    

    2. 直接在Open vSwitch下发流表,用vlan得到下列虚拟网段,请逐条说明所下发的流表含义

    s1:

    #s1将从端口号为1,2,3的主机发来的数据贴上相同的vlan tag,然后从4端口发往s2(vlan_id从0开始)
    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
    
    #s1将接收到的数据包去除vlan tag,然后根据dl_vlan(数据包原始的vlan_id),向指定端口转发
    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:

    #s2将从端口号为1,2,3的主机发来的数据贴上相同的vlan tag,然后从4端口发往s1(vlan_id从0开始)
    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
    #s2将接收到的数据包去除vlan tag,然后根据dl_vlan(数据包原始的vlan_id),向指定端口转发
    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
    

    终端执行图:

    3. 直接在Open vSwitch查看流表,提交OVS命令执行结果

    4. 提交主机连通性测试结果,验证流表的有效性

    5. 利用Wireshark抓包,分析验证特定报文

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  • 原文地址:https://www.cnblogs.com/qingke1314/p/11808136.html
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