实验7:基于REST API的SDN北向应用实践
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
基本要求
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
(2) 下发指令删除s1上的流表数据。
(3) 下发硬超时流表,实现拓扑内主机h1和h3网络中断20s
(4)获取s1上活动的流表数
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
(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
vlanflow.sh
curl -X POST -d '{ "dpid": 1, "priority": 1, "match":{ "in_port": 1 }, "actions":[ { "type": "PUSH_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "SET_FIELD", "field": "vlan_vid", # Set VLAN ID "value": 4096 # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096) }, { "type": "OUTPUT", "port": 3 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 1, "priority": 1, "match":{ "in_port": 2 }, "actions":[ { "type": "PUSH_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "SET_FIELD", "field": "vlan_vid", # Set VLAN ID "value": 4097 # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096) }, { "type": "OUTPUT", "port": 3 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 1, "priority": 1, "match":{ "vlan_vid": 0 }, "actions":[ { "type": "POP_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "OUTPUT", "port": 1 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 1, "priority": 1, "match":{ "vlan_vid": 1 }, "actions":[ { "type": "POP_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "OUTPUT", "port": 2 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 2, "priority": 1, "match":{ "in_port": 1 }, "actions":[ { "type": "PUSH_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "SET_FIELD", "field": "vlan_vid", # Set VLAN ID "value": 4096 # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096) }, { "type": "OUTPUT", "port": 3 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 2, "priority": 1, "match":{ "in_port": 2 }, "actions":[ { "type": "PUSH_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "SET_FIELD", "field": "vlan_vid", # Set VLAN ID "value": 4097 # Describe sum of vlan_id(e.g. 6) | OFPVID_PRESENT(0x1000=4096) }, { "type": "OUTPUT", "port": 3 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 2, "priority": 1, "match":{ "vlan_vid": 0 }, "actions":[ { "type": "POP_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "OUTPUT", "port": 1 } ] }' http://localhost:8080/stats/flowentry/add curl -X POST -d '{ "dpid": 2, "priority": 1, "match":{ "vlan_vid": 1 }, "actions":[ { "type": "POP_VLAN", # Push a new VLAN tag if a input frame is non-VLAN-tagged "ethertype": 33024 # Ethertype 0x8100(=33024): IEEE 802.1Q VLAN-tagged frame }, { "type": "OUTPUT", "port": 2 } ] }' http://localhost:8080/stats/flowentry/add
(三)个人总结
本次实验难度比较大,我学会调用OpenDaylight REST API实现特定网络功能和Ryu REST API实现特定网络功能。对于本次实验的ryu的知识和vlan实验的代码配置我还是有很多的不熟悉的地方,在同学的帮助下才能完成本次的实验。在做实验的过程中遇到了很多问题,比如下发指令删除流表时,会出现权限不够或者链接过多的问题,输入代码前要加上sudo或者清理缓存并重启电脑,在实验第二题的时候出现错误curl: command not found curl插件没有安装 解决办法:在root模式下apt-get update -y && apt-get install curl -y。