一、實驗目的

能夠編寫程序調用OpenDaylight REST API實現特定網絡功能；
能夠編寫程序調用Ryu REST API實現特定網絡功能。

二、實驗環境

下載虛擬機軟件Oracle VisualBox或VMware；
在虛擬機中安裝Ubuntu 20.04 Desktop amd64，并完整安裝Mininet、OpenDaylight（Carbon版本）、Postman和Ryu；

三、實驗要求
（一）基本要求

OpenDaylight
（1）利用Mininet平臺搭建下圖所示網絡拓撲，并連接OpenDaylight；

（2）編寫Python程序，調用OpenDaylight的北向接口下發指令刪除s1上的流表數據。

Delete.py

#!/usr/bin/python
import requests
from requests.auth import HTTPBasicAuth

def http_delete(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/'
    resp = http_delete(url)
    print(resp.content)

（3）編寫Python程序，調用OpenDaylight的北向接口下發硬超時流表，實現拓撲內主機h1和h3網絡中斷20s。
Interrupt.py

#!/usr/bin/python
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("flowstable.json") as f:
        jstr = f.read()
    resp = http_put(url,jstr)
    print (resp.content)

flowstable.jsoh

{
  "flow": [
    {
      "id": "1",
      "match": {
        "in-port": "1",
        "ethernet-match": {
          "ethernet-type": {
            "type": "0x0800"
          }
        },
        "ipv4-destination": "10.0.0.3/32"
      },
      "instructions": {
        "instruction": [
          {
            "order": "0",
            "apply-actions": {
              "action": [
                {
                  "order": "0",
                  "drop-action": {}
                }
              ]
            }
          }
        ]
      },
      "flow-name": "flow1",
      "priority": "65535",
      "hard-timeout": "20",
      "cookie": "2",
      "table_id": "0"
    }
  ]
}

（4）編寫Python程序，調用OpenDaylight的北向接口獲取s1上活動的流表數。
get.py

#!/usr/bin/python
import requests
from requests.auth import HTTPBasicAuth

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'
    headers = {'Content-Type': 'application/json'}
    res = requests.get(url,headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    print (res.content)

Ryu
（1）編寫Python程序，調用Ryu的北向接口，實現上述OpenDaylight實驗拓撲上相同的硬超時流表下發。

ryuflow.py

#!/usr/bin/python
import requests

if __name__ == "__main__":
    url = 'http://127.0.0.1:8080/stats/flowentry/add'
    with open("./flowtable.json") as f:
        jstr = f.read()
    headers = {'Content-Type': 'application/json'}
    res = requests.post(url, jstr, headers=headers)
    print (res.content)

flowtable2.json

{
    "dpid": 1,
    "cookie": 1,
    "cookie_mask": 1,
    "table_id": 0,
    "hard_timeout": 20,
    "priority": 65535,
    "flags": 1,
    "match":{
        "in_port":1
    },
    "actions":[
        {
            "type":"OUTPUT",
            "port": 2
        }
    ]
 }

（2）利用Mininet平臺搭建下圖所示網絡拓撲，要求支持OpenFlow 1.3協議，主機名、交換機名以及端口對應正確。拓撲生成后需連接Ryu，且Ryu應能夠提供REST API服務

topo.py

#!/usr/bin/env python
from mininet.topo import Topo

class MyTopo(Topo):
    def __init__(self):
        # initilaize topology
        Topo.__init__(self)

        self.addSwitch("s1")
        self.addSwitch("s2")

        self.addHost("h1")
        self.addHost("h2")
        self.addHost("h3")
        self.addHost("h4")

        self.addLink("s1", "h1")
        self.addLink("s1", "h2")
        self.addLink("s2", "h3")
        self.addLink("s2", "h4")
        self.addLink("s1", "s2")

topos = {'mytopo': (lambda: MyTopo())}

打開控制器輸入以下命令

ryu-manager  ryu.app.simple_switch_13 ryu.app.ofctl_rest

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

VLAN_ID	Hosts
0	h1 h3
1	h2 h4

shell腳本

# 將主機1，2發送來的數據包打上vlan標記
curl -X POST -d '{
    "dpid": 1,
    "priority": 1,
    "match":{
        "in_port": 1
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     
            "ethertype": 33024       
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",    
            "value": 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",    
            "ethertype": 33024      
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     
            "value": 4097           
        },
        {
            "type": "OUTPUT",
            "port": 3
        }
    ]
 }' http://localhost:8080/stats/flowentry/add

# 將主機3，4發送來的數據包取出vlan標記
 curl -X POST -d '{
    "dpid": 1,
    "priority": 1,
    "match":{
        "vlan_vid": 0
    },
    "actions":[
        {
            "type": "POP_VLAN",    
            "ethertype": 33024       
        },
        {
            "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",    
            "ethertype": 33024      
        },
        {
            "type": "OUTPUT",
            "port": 2
        }
    ]
 }' http://localhost:8080/stats/flowentry/add

# 將主機3，4發送來的數據包打上vlan標記
 curl -X POST -d '{
    "dpid": 2,
    "priority": 1,
    "match":{
        "in_port": 1
    },
    "actions":[
        {
            "type": "PUSH_VLAN",    
            "ethertype": 33024      
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",    
            "value": 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",    
            "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": 2,
    "priority": 1,
    "match":{
        "vlan_vid": 0
    },
    "actions":[
        {
            "type": "POP_VLAN",    
            "ethertype": 33024      
        },
        {
            "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",    
            "ethertype": 33024      
        },
        {
            "type": "OUTPUT",
            "port": 2
        }
    ]
 }' http://localhost:8080/stats/flowentry/add

運行shell文件之后

四、實驗總結

實驗難度：較難
遇到的問題以及解決辦法：在做odl的時候，由于以前一直沒有更改默認的python版本號，以前使用的python命令是python3，但是這次做的時候忘記了，導致一直使用python，打開python文件，結果一直錯誤，但是之后改用了python3 的打開方式之后，解決問題。還有就是在ryu控制器的時候，打開控制器后創建了拓撲但是無法ping通，之后我刪除了mininet的緩存，重新啟動虛擬機，再打開ryu控制器，結果一切順利
個人感受，自己以前做過的實驗，做完之后并沒有及時去復習，導致再次做實驗的時候，有些命令已經忘記了，還要繼續去翻找以前的文件，對于虛擬機的知識了解不夠，還需要多加學習。

posted on 2021-10-27 15:03 北冥有魚其名為嘉閱讀(70) 評論(0) 收藏舉報

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