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SDN第7次實驗

(一)基本要求

(1)編寫Python程式,呼叫OpenDaylight的北向介面下發指令刪除s1上的流表資料。

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('test.json') as f:
        jstr = f.read()
    resp = http_detele(url)
    print(resp.content)

(2) 編寫Python程式,呼叫OpenDaylight的北向介面下發硬超時流表,實現拓撲內主機h1和h3網路中斷20s。

import requests
from requests.auth import HTTPBasicAuth


def http_put(url, jstr):
    url = url
    headers = {'Content-Type': 'application/json'}
    resp = requests.put(url, jstr, 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/flow-node-inventory:table/0/flow/1'
    with open('test.json') as f:
        jstr = f.read()
    resp = http_put(url, jstr)
    print(resp.content)

(4)編寫Python程式,呼叫OpenDaylight的北向介面獲取s1上活動的流表數。

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('test.json') as f:
        jstr = f.read()
    resp = http_get(url)
    print(resp.content)

2.ryu

(1)編寫Python程式,呼叫Ryu的北向介面,實現上述OpenDaylight實驗拓撲上相同的硬超時流表下發。

def http_post(url, js):
    headers = {'Content-Type': 'application/json'}
    resp = requests.post(url, jstr, headers=headers)
    print(resp)


if __name__ == '__main__':
    url = 'http://localhost:8080/stats/flowentry/add'
    with open('test.json') as f:
        jstr = f.read()
    http_post(url, jstr)
{
  "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平臺搭建下圖所示網路拓撲,要求支援OpenFlow 1.3協議,主機名、交換機名以及埠對應正確。拓撲生成後需連線Ryu,且Ryu應能夠提供REST API服務。

(3) 整理一個Shell指令碼,參考Ryu REST API的文件,利用curl命令,實現和實驗2相同的VLAN。

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)進階

程式設計實現基本要求第2部分Ryu(3)中的VLAN劃分。

import requests

def http_post(url, js):
    headers = {'Content-Type': 'application/json'}
    resp = requests.post(url, jstr, headers=headers)
    print(resp.content)


if __name__ == '__main__':
    url = 'http://localhost:8080/stats/flowentry/add'
    for i in range(1, 9):
        with open('%s.json' % i) as f:
            jstr = f.read()
        http_post(url, jstr)

(將流表項分開為8個json檔案並且逐個讀取新增)

(三)心得

這次實驗也較為成功。借鑑了網路還有大佬的哈哈哈哈快了很多(狠狠推薦https://www.cnblogs.com/Moonlightcode/p/15416597.html)。剛開始ODL裡面重複刪除流表導致一直無法下發刪除命令。get取得活躍流表值也一直是零。。後面逐步解決了。也一直主要是python程式碼的編寫。然後因為python程式碼有嚴格的縮排等等的要求,搞了很久。。百度排錯。。還有學習了auno編寫py檔案,是ctrl + O 儲存,ctrl + X推出。用更新pip的方法還是執行不了py檔案,直接可以用python3 命令執行,不過格式上print()不能忘記加。再ryu的實驗中 因為沒有徹底結束ODL的使用第一次出錯了,重啟虛擬機器就解決了,還有進階同樣是of_ctl.py是在app下面。這次就是通過py語言實現和postman一樣的功能。進階還是借鑑了同學啊哈哈哈哈。希望再接再厲!