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实验7：基于REST API的SDN北向应用实践一、实验目的能够编写程序调用OPEnDaylight REST API实现特定网络功能；能够编写程序调用Ryu REST API实现特定网络功能。二、实验环境下载虚拟机软件oracle VisualBox或VMware；在虚拟机中安装Ubuntu 20.04 Desktop amd64，并完整安装Mininet、OpenDaylight（Carbon版本）、Postman和Ryu；三、实验要求（一）基本要求OpenDaylight（1） 利用Mininet平台搭建下图所示网络拓扑，并连接OpenDaylight；搭建拓扑：sudo mn --topo=single,3 --mac --controller=remote,ip=127.0.0.1,port=6633 --swITch ovsk,PRotocols=OpenFlow10连接OpenDaylight(ODL目录下)：./distribution-karaf-0.6.4-Carbon/bin/karaf（2） 编写Python程序，调用OpenDaylight的北向接口下发指令删除s1上的流表数据。def http_detele(url):url = urlheaders = {'Content-Type': 'application/json'}resp = requests.delete(url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))return respif 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)

（3） 编写Python程序，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。import requestsFrom requests.auth import HTTPBasicAuthdef http_put(url,jstr):url= urlheaders = {'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('206.json') as f:jstr = f.read()resp = http_put(url,jstr)print (resp.content)（4） 编写Python程序，调用OpenDaylight的北向接口获取s1上活动的流表数。import requestsimport jsonfrom requests.auth import HTTPBasicAuthdef http_get(url):url= urlheaders = {'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('206.json') as f:jstr = f.read()resp = http_get(url)print(resp.content)Ryu（1） 编写Python程序，调用Ryu的北向接口，实现上述OpenDaylight实验拓扑上相同的硬超时流表下发。json：{"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平台搭建下图所示网络拓扑，要求支持OpenFlow 1.3协议，主机名、交换机名以及端口对应正确。拓扑生成后需连接Ryu，且Ryu应能够提供REST API服务。

pythonimport requestsfrom requests.auth import HTTPBasicAuthdef http_post(url,jstr):url= urlheaders = {'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('206-Ryu-1.json') as f:jstr = f.read()resp = http_post(url,jstr)print (resp.content)（3） 整理一个Shell脚本，参考Ryu REST API的文档，利用curl命令，实现和实验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/addcurl -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

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