实验7：基于REST API的SDN北向应用实践

（一）基本要求
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；

  • 启动ODL
    ./distribution-karaf-0.6.4-Carbon/bin/karaf

     

  • 创建topo
    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。import requests

  • 编写delete.py，调用OpenDaylight的北向接口下发指令删除s1上的流表数据
  • delete.py
  • from requests.auth import HTTPBasicAuth

if __name__ == '__main__':
    url = 'http://127.0.0.1:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/'
    headers = {'Content-Type': 'application/json'}
    response = requests.delete(url=url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    print(response.content)

  • （3）下发硬超时流表，实现拓扑内主机h1和h3网络中断20s。

  • 编写timeout.py及timeout.json，调用OpenDaylight的北向接口下发硬超时流表，实现拓扑内主机h1和h3网络中断20s
  • timeout.py
    复制代码
    #!/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/flow-node-inventory:table/0/flow/1'
    with open("./timeout.json") as file:
        str = file.read()
    headers = {'Content-Type': 'application/json'}
    res = requests.put(url, str, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    print (res.content)
    复制代码

    imeout.json

  • 复制代码
    {
    "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"
        }
    ]
    }
    复制代码

    （4）获取s1上活动的流表数。

  • 编写get_flows.py，调用OpenDaylight的北向接口获取s1上活动的流表数
  • get_flows.py
    复制代码
    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'}
    response = requests.get(url=url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    print(response.content)
    复制代码

    2、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。

    • 编写ryu_timeout.py及ryu_timeout.json，调用Ryu的北向接口实现硬超时流表下发

    ryu_timeout.py

    复制代码
    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)
    复制代码
    ryu_timeout.json
    复制代码
    {
    "dpid": 1,
    "cookie": 1,
    "cookie_mask": 1,
    "table_id": 0,
    "hard_timeout": 20,
    "priority": 65535,
    "flags": 1,
    "match":{
        "in_port":1
    },
    "actions":[]
 }
    复制代码
    打开ryu
  • ryu-manager ryu.app.simple_switch_13 ryu.app.ofctl_rest

    • 创建topo

    • sudo mn --topo=single,3 --mac --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13

    • 运行ryu_timeout.py

    • 实现硬超时功能

       

    （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

    VLAN_IDHOST
    0 h1、h3
    1 h2、h4
    • 根据VLAN实验的网络拓扑编写ryu_topo.py

    ryu_topo.py

    复制代码
    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())
    复制代码
  • 法二：参考Ryu REST API的文档，编写ryu_vlan.py,ryu_vlan.json代码

  • ryu_vlan.py

    复制代码
    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)]
    复制代码

     

    ryu_vlan.json

    复制代码
    {
    "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
                }
            ]
        }
    ]
}
    复制代码

     

    • 实现

    • 打开ryu
      ryu-manager ryu.app.simple_switch_13 ryu.app.ofctl_rest

    • topo连接控制器
      sudo mn --custom ryu_topo.py --topo ryu_topo --mac --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13

       

    • 删除流表
      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

      • 法二：运行ryu_vlan.py代码，实现相同的VLAN配置

      • 实验心得

      • 这次实验花了很长的时间，本来对这网络方面已经不算太了解，就是在不断的试错不断地改正，向别的同学不断学习才慢慢做出来的，有时候一个小错误一直找不到是哪里的问题，便需要一直找就很费时间花精力，所以我的动手能力还有待提高，对于这些知识点还需要更深入地去熟悉
posted @   cc122  阅读(4)  评论(0)  编辑  收藏  举报
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