2019 SDN上机第二次作业

2019 SDN上机第二次作业

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

1.1创建拓扑结构

1.2执行结果

1.3展示网络信息

1.4展示端口连接情况

2.直接在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

2.1 s1流表

#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

2.2 s2流表

#同上所述
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

3.直接在Open vSwitch查看流表，提交OVS命令执行结果

3.1查询s1流表

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

3.2查询s2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

4.1测试其连通性

pingall

5.利用Wireshark抓包，分析验证特定报文