实验7：基于REST API的SDN北向应用实践

一、实验目的

1. 能够编写程序调用OpenDaylight REST API实现特定网络功能；
2. 能够编写程序调用Ryu REST API实现特定网络功能。

二、实验环境

1. 下载虚拟机软件Oracle VisualBox或VMware；
2. 在虚拟机中安装Ubuntu 20.04 Desktop amd64，并完整安装Mininet、OpenDaylight（Carbon版本）、Postman和Ryu；

三、实验要求

（一）基本要求

1. OpenDaylight
   （1） 利用Mininet平台搭建下图所示网络拓扑，并连接OpenDaylight；
   
   （2） 编写Python程序，调用OpenDaylight的北向接口下发指令删除s1上的流表数据。

   

    

   
   （3） 编写Python程序，调用OpenDaylight的北向接口下发硬超时流表，实现拓扑内主机h1和h3网络中断20s。

   

    

    

   
   （4） 编写Python程序，调用OpenDaylight的北向接口获取s1上活动的流表数。
2. 

   

    

   
   

    

3. Ryu
   （1） 编写Python程序，调用Ryu的北向接口，实现上述OpenDaylight实验拓扑上相同的硬超时流表下发。
4. 

   

    

   
   （2） 利用Mininet平台搭建下图所示网络拓扑，要求支持OpenFlow 1.3协议，主机名、交换机名以及端口对应正确。拓扑生成后需连接Ryu，且Ryu应能够提供REST API服务。
   
   （3） 整理一个Shell脚本，参考Ryu REST API的文档，利用curl命令，实现和实验2相同的VLAN。
   
   

   curl -X POST -d '{
       "dpid": 1,
       "priority": 1,
       "match":{
           "in_port": 1
       },
       "actions":[
           {
               "type": "PUSH_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "SET_FIELD",
               "field": "vlan_vid",     # Set VLAN ID
               "value": 4096            # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096)
           },
           {
               "type": "OUTPUT",
               "port": 3
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
    curl -X POST -d '{
       "dpid": 1,
       "priority": 1,
       "match":{
           "in_port": 2
       },
       "actions":[
           {
               "type": "PUSH_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "SET_FIELD",
               "field": "vlan_vid",     # Set VLAN ID
               "value": 4097            # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096)
           },
           {
               "type": "OUTPUT",
               "port": 3
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
   
    curl -X POST -d '{
       "dpid": 1,
       "priority": 1,
       "match":{
           "vlan_vid": 0
       },
       "actions":[
           {
               "type": "POP_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "OUTPUT",
               "port": 1
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
    curl -X POST -d '{
       "dpid": 1,
       "priority": 1,
       "match":{
           "vlan_vid": 1
       },
       "actions":[
           {
               "type": "POP_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "OUTPUT",
               "port": 2
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
   
    curl -X POST -d '{
       "dpid": 2,
       "priority": 1,
       "match":{
           "in_port": 1
       },
       "actions":[
           {
               "type": "PUSH_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "SET_FIELD",
               "field": "vlan_vid",     # Set VLAN ID
               "value": 4096            # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096)
           },
           {
               "type": "OUTPUT",
               "port": 3
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
    curl -X POST -d '{
       "dpid": 2,
       "priority": 1,
       "match":{
           "in_port": 2
       },
       "actions":[
           {
               "type": "PUSH_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "SET_FIELD",
               "field": "vlan_vid",     # Set VLAN ID
               "value": 4097            # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096)
           },
           {
               "type": "OUTPUT",
               "port": 3
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
    curl -X POST -d '{
       "dpid": 2,
       "priority": 1,
       "match":{
           "vlan_vid": 0
       },
       "actions":[
           {
               "type": "POP_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "OUTPUT",
               "port": 1
           }
       ]
    }' http://localhost:8080/stats/flowentry/add
   
    curl -X POST -d '{
       "dpid": 2,
       "priority": 1,
       "match":{
           "vlan_vid": 1
       },
       "actions":[
           {
               "type": "POP_VLAN",     # Push a new VLAN tag if a input frame is non-VLAN-tagged
               "ethertype": 33024       # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame
           },
           {
               "type": "OUTPUT",
               "port": 2
           }
       ]
    }' http://localhost:8080/stats/flowentry/add

   

    （三）实验总结

5. 这次的实验比较难，耗费了大量的时间，主要还是Python编写部分，真的是摸不着头脑，最终参考了同学的代码，其他也遇到了一些问题，但是经过努力还算解决了，总的来说这次的实验还是不太懂，还需要继续努力。