2019 SDN上机第2次作业

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

• 进入miniedit在线创建拓扑
  
  
• 支持OpenFlow1.3协议
  
• 拓扑执行结果
  
• 端口连接情况
  

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

• 将来自h1,h2,h3的包打上vlan tag，从s1的端口4转发

ovs-ofctl add-flow -O OpenFlow13 s1 in_port=1,actions=push_vlan:0x8100,set_field:4096->vlan_vid,output:4
ovs-ofctl add-flow -O OpenFlow13 s1 in_port=2,actions=push_vlan:0x8100,set_field:4097->vlan_vid,output:4
ovs-ofctl add-flow -O OpenFlow13 s1 in_port=3,actions=push_vlan:0x8100,set_field:4098->vlan_vid,output:4

• s1接收端口4的包，并去除vlan tag，从端口1/2/3分别转发到h1/h2/h3

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

• 将来自h1,h2,h3的包打上vlan tag，从s2的端口4转发

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接收端口4的包，并去除vlan tag，从端口1/2/3分别转发到h1/h2/h3

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

3. 直接在Open vSwitch查看流表，提交OVS命令执行结果

• 查看s1的流表

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

• 查看s2的流表

sudo ovs-ofctl -O OpenFlow13 dump-flows s2

4. 提交主机连通性测试结果，验证流表的有效性

pingall

5. 利用Wireshark抓包，分析验证特定报文