sdn第七次上机实验

实验7：基于REST API的SDN北向应用实践

一、实验目的

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

二、实验环境

下载虚拟机软件Oracle VisualBox或VMware；
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

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。

nano t1.py

def http_detele(url):
    url = url
    headers = {'Content-Type': 'application/json'}
    resp = requests.delete(url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    return resp

if __name__ == '__main__':
    url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/'
    with open('t1.json') as f:
        jstr = f.read()
    resp = http_detele(url)
    print(resp.content)

（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。
Python：

nano t1.py

import requests
import json
from requests.auth import HTTPBasicAuth
def http_get(url):
    url= url
    headers = {'Content-Type':'application/json'}
    resp = requests.get(url,headers=headers,auth=HTTPBasicAuth('admin','admin'))
    return resp

if __name__ == "__main__":
     url = 'http://127.0.0.1:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/opendaylight-flow-table-statistics:flow-table-statistics'
     with open('t1.json') as f:
      jstr = f.read()
      resp = http_get(url)
      print(resp.content)

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

import requests
import json
from requests.auth import HTTPBasicAuth
def http_get(url):
    url= url
    headers = {'Content-Type':'application/json'}
    resp = requests.get(url,headers=headers,auth=HTTPBasicAuth('admin','admin'))
    return resp

if __name__ == "__main__":
     url = 'http://127.0.0.1:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/opendaylight-flow-table-statistics:flow-table-statistics'
     with open('t1.json') as f:
      jstr = f.read()
      resp = http_get(url)
      print(resp.content)
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。
python：

import requests
from requests.auth import HTTPBasicAuth
def http_post(url,jstr):
    url= url
    headers = {'Content-Type':'application/json'}
    resp = requests.post(url,jstr,headers=headers)
    return resp

if __name__ == "__main__":
    url='http://127.0.0.1:8080/stats/flowentry/add'
    with open('r1.json') as f:
        jstr = f.read()
    resp = http_post(url,jstr)
    print (resp.content)

json：

{
  "dpid": 1,
  "match": {
    "in-port": "1",
    "dl_dst": "00:00:00:00:00:03"
  },
  "priority": 65535,
  "hard_timeout": 20,
  "cookie": "2",
  "table_id": 0,
  "actions": []
}

（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。
连接Ryu：ryu-manager ryu/ryu/app/gui_topology/gui_topology.py --observe-links

（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。
|VLAN_ID|Hosts|
|:--|:--|
|0|h1 h3|
|1|h2 h4|
curl -X POST -d '{
  "dpid": 1,
  "match": {
    "in_port": 1
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4096
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 1,
  "priority":5,
  "match": {
    "in_port": 2
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4097
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ]
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 1,
  "match": {
    "vlan_vid": 0
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 1
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add

curl -X POST -d'
{
  "dpid": 1,
  "match": {
    "vlan_vid": 1
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 2
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
  "dpid": 2,
  "match": {
    "in_port": 1
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4096
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 2,
  "match": {
    "in_port": 2
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4097
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 2,
  "match": {
    "vlan_vid": 0
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 1
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add

curl -X POST -d'
{
  "dpid": 2,
  "match": {
    "vlan_vid": 1
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 2
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

（二）进阶要求

编程实现基本要求第2部分Ryu（3）中的VLAN划分。

总结：对于这次实验不是很能独立完成，借助同学帮助，和之前同学完成的作业来进行这个实验，进行python和json文件创建，刚开始也找不到json文件，后面也是看了之前完成同学的相关操作也算是勉强完成了，然后发现其实不是很难，然后再进行删除流表数据也算有点问题，刚开始死活找不到，以为没有数据，想着没有数据怎么删，后面和同学进行排查，经历了很久才完成，确实是完成这个挺难的实验。希望总结过后能给以后带来点收获。

posted @ 2021-10-26 17:38 冷葬阅读(43) 评论(0) 编辑收藏举报

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