SDN第7次實驗
阿新 • • 發佈:2021-10-18
(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)
(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!