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实验七

时间：2022-11-02 21:55:34浏览次数：39  
标签：url self flow headers json 实验 type

1.基础要求
a）编写Python程序，调用OpenDaylight的北向接口实现以下功能
（1） 利用Mininet平台搭建下图所示网络拓扑，并连接OpenDaylight；
相应Python代码
sudo mn --topo=single,3 --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13 #创建拓扑
./distribution-karaf-0.6.4-Carbon/bin/karaf #启动ODL
执行结果截图

（2） 下发指令删除s1上的流表数据。
相应Python代码

!/usr/bin/pythonimport requestsfrom requests.auth import HTTPBasicAuth

if name == "main":
url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/'
headers = {'Content-Type': 'application/json'}
res = requests.delete(url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
print (res.content)
执行结果截图

（3） 下发硬超时流表，实现拓扑内主机h1和h3网络中断20s。
相应Python代码

!/usr/bin/pythonimport requestsfrom requests.auth import HTTPBasicAuth

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("./hardtimeout.json") as f:
jstr = f.read()
headers = {'Content-Type': 'application/json'}
res = requests.put(url, jstr, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
print (res.content)

以JSON格式填入流表内容 flow.json内容如下

{
"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"
}
]
}
执行结果截图

（4） 获取s1上活动的流表数。
相应Python代码

!/usr/bin/pythonimport requestsfrom 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)
b）编写Python程序，调用Ryu的北向接口实现以下功能
（1） 实现上述OpenDaylight实验拓扑上相同的硬超时流表下发。
相应Python代码
·ryu_hardtimeout.py 代码

!/usr/bin/pythonimport requestsfrom requests.auth import HTTPBasicAuthdef 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("./ryu_hardtimeout.json") as f:
jstr = f.read()
resp = http_post(url,jstr)
print (resp.content)
·ryu_hardtimeout.json 代码
{
"dpid": 1,
"cookie": 1,
"cookie_mask": 1,
"table_id": 0,
"hard_timeout": 20,
"priority": 65535,
"flags": 1,
"match":{
"in_port":1
},
"actions":[]
}
执行结果截图

（2） 参考Ryu REST API的文档，基于VLAN实验的网络拓扑，编程实现相同的VLAN配置。（提示：拓扑生成后需连接Ryu，且Ryu应能够提供REST API服务）
相应Python代码
·mytopo.py代码
from mininet.topo import Topo
class MyTopo(Topo):
def init(self):

    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())}
·setvlan.py代码

!/usr/bin/python

import json
import requests

if name == "main":
url = 'http://127.0.0.1:8080/stats/flowentry/add'
headers = {'Content-Type': 'application/json'}
flow1 = {
"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
}
]
}
flow2 = {
"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
}
]
}
flow3 = {
"dpid": 1,
"priority": 1,
"match":{
"vlan_vid": 0
},
"actions":[
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
}
flow4 = {
"dpid": 1,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
}
flow5 = {
"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
}
]
}
flow6 = {
"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
}
]
}
flow7 = {
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 0
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
}
flow8 = {
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [
{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
}
res1 = requests.post(url, json.dumps(flow1), headers=headers)
res2 = requests.post(url, json.dumps(flow2), headers=headers)
res3 = requests.post(url, json.dumps(flow3), headers=headers)
res4 = requests.post(url, json.dumps(flow4), headers=headers)
res5 = requests.post(url, json.dumps(flow5), headers=headers)
res6 = requests.post(url, json.dumps(flow6), headers=headers)
res7 = requests.post(url, json.dumps(flow7), headers=headers)
res8 = requests.post(url, json.dumps(flow8), headers=headers)
执行结果截图

2.进阶要求
OpenDaylight或Ryu任选其一，编程实现查看前序VLAN实验拓扑中所有节点（含交换机、主机）的名称，以及显示每台交换机的所有流表项。
相应Python代码
·ryu_getset.py
import requestsimport timeimport re

class GetNodes:
def init(self, ip):
self.ip = ip

def get_switch_id(self):
    url = 'http://' + self.ip + 'ats/switches'
    re_switch_id = requests.get(url=url).json()
    switch_id_hex = []
    for i in re_switch_id:
        switch_id_hex.append(hex(i))

    return switch_id_hex

def getflow(self):
    url = 'http://' + self.ip + 'ats/flow/%d'
    switch_list = self.get_switch_id()
    ret_flow = []
    for switch in switch_list:
        new_url = format(url % int(switch, 16))
        re_switch_flow = requests.get(url=new_url).json()
        ret_flow.append(re_switch_flow)
    return ret_flow

def show(self):
    flow_list = self.getflow()
    for flow in flow_list:
        for dpid in flow.keys():
            dp_id = dpid
            switchnum= '{1}'.format(hex(int(dp_id)), int(dp_id))        
            print('s'+switchnum,end = " ")
            switchnum = int(switchnum)
        for list_table in flow.values():
            for table in list_table:          
                string1 = str(table)
                if re.search("'dl_vlan': '(.*?)'", string1) is not None:
                    num = re.search("'dl_vlan': '(.*?)'", string1).group(1);
                    if num == '0' and switchnum == 1:
                      print('h1',end = " ")
                    if num == '1' and switchnum == 1:
                      print('h2',end = " ")
                    if num == '0' and switchnum == 2:
                      print('h3',end = " ")
                    if num == '1' and switchnum == 2:
                      print('h4',end = " ")
    print("")
    flow_list = self.getflow()
    for flow in flow_list:
        for dpid in flow.keys():
            dp_id = dpid
            print('switch_name:s{1}'.format(hex(int(dp_id)), int(dp_id)))
        for list_table in flow.values():
            for table in list_table:
                print(table)

s1 = GetNodes("127.0.0.1:8080")
s1.show()

3.个人总结
a）实验感想
本次实验对我来说难度较大，十分考验对之前实验的熟悉以及综合运用。通过本次实验我对ryu和open daylight的使用包括功能上更加熟悉，同时也有了深刻的了解。在实验过程中也发现对于代码编写方面比较薄弱，python的格式以及应用有待加强。

标签：url,self,flow,headers,json,实验,type
From： https://www.cnblogs.com/crrcrr/p/16852654.html

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