实验7：基于REST API的SDN北向应用实践
1.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；
a.打开odl控制器
./distribution-karaf-0.6.4-Carbon/bin/karaf
b.创建拓扑
sudo mn --topo=single,3 --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13
（2） 下发指令删除s1上的流表数据。
a.delete.py代码
#!/usr/bin/python
import requests
from 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)
（3） 下发硬超时流表，实现拓扑内主机h1和h3网络中断20s。
timeout.py文件
#!/usr/bin/python
import requests
from 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)
timeout.json文件
{
"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": "flow",
"priority": "65535",
"hard-timeout": "20",
"cookie": "2",
"table_id": "0"
}
]
}
（4） 获取s1上活动的流表数
getflow.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)
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。
ryu控制器
ryu-manager ryu.app.simple_switch_13 ryu.app.ofctl_rest
ryu_timeout.py
import requests
from requests.auth import HTTPBasicAuth
if __name__ == '__main__':
url = 'http://127.0.0.1:8080/stats/flowentry/add'
headers = {'Content-Type': 'application/json'}
json = open('ryu_timeout.json').read()
response = requests.post(url, data=json, headers=headers)
print(response.content)
ryu_timeout.json
{
"dpid": 1,
"cookie": 1,
"cookie_mask": 1,
"table_id": 0,
"hard_timeout": 20,
"priority": 65535,
"flags": 1,
"match":{
"in_port":1
},
"actions":[]
}
（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
ryu_topo.py代码
from mininet.topo import Topo
class ryu_topo(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 = {'ryu_topo': (lambda: ryu_topo())}
ryu_vlan.py代码
import json
import requests
if __name__ == '__main__':
url = 'http://127.0.0.1:8080/stats/flowentry/add'
headers = {'Content-Type': 'application/json'}
f = open('ryu_vlan.json').read()
flows = json.loads(f)['flows']
[requests.post(url, data=json.dumps(flows[i]), headers=headers) for i in range(0, 8)]
ryu_vlan.json代码
{
"flows": [
{
"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
}
]
},
{
"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
}
]
},
{
"dpid": 1,
"priority": 1,
"match": {
"vlan_vid": 0
},
"actions": [{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
},
{
"dpid": 1,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
},
{
"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
}
]
},
{
"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
}
]
},
{
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 0
},
"actions": [{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 1
}
]
},
{
"dpid": 2,
"priority": 1,
"match": {
"vlan_vid": 1
},
"actions": [{
"type": "POP_VLAN",
"ethertype": 33024
},
{
"type": "OUTPUT",
"port": 2
}
]
}
]
}
创建一个拓扑并清空流表
sudo mn --custom ryu_topo.py --topo ryu_topo --mac --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13
curl -X DELETE http://127.0.0.1:8080/stats/flowentry/clear/1
curl -X DELETE http://127.0.0.1:8080/stats/flowentry/clear/2
ryu-manager ryu.app.simple_switch_13 ryu.app.ofctl_rest //打开RYU
个人总结
这次的PPT给的提示比较少,主要是编写代码的部分难,因此参考了其他同学的代码,其他的操作在实验四和实验五都做过了. 忘记了也可以看看之前的资料.
posted on 2022-11-02 21:55 zzzxxzxzxzxzxz 阅读(136) 评论(0) 编辑 收藏 举报
