2019 SDN上机第4次作业

1. 解压安装OpenDayLight控制器（本次实验统一使用Beryllium版本）

2. 启动并安装插件

3. 用Python脚本搭建如下拓扑，连接OpenDayLight控制器

Python代码：

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import RemoteController,CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections

class MyTopo( Topo ):
    def __init__( self ):
        Topo.__init__( self )
        s1=self.addSwitch('s1')
        for i in range(1,4):
        	hw = self.addHost( 'h{}'.format( i ) )
                self.addLink(hw,s1)

topos = { 'mytopo': ( lambda: MyTopo() ) }

运行结果：

pingall：

拓扑图

4. 在控制器提供的WEB UI中下发流表使h2 20s内ping不通h3，20s后恢复

结果：

5. 借助Postman通过OpenDayLight的北向接口下发流表，再利用OpenDayLight北向接口查看已下发的流表。

通过preview查看刚才下发的流表

http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/1/flow-node-inventory:table/0/flow/1

{
    "flow": [
        {
            "id": "1",
            "match": {
                "in-port": "2",
                "ipv4-destination": "10.0.0.3/32"
            },
            "instructions": {
                "instruction": [
                    {
                        "order": "0",
                        "apply-actions": {
                            "action": [
                                {
                                    "order": "0",
                                    "drop-action": {}
                                }
                            ]
                        }
                    }
                ]
            },
            "flow-name": "flow3",
            "priority": "65535",
            "hard-timeout": "20",
            "cookie": "4",
            "table_id": "0"
        }
    ]
}

将preview里的url复制到地址栏，消息方式选PUT
IP为控制器所在的PC的IP
type选择Basic Auth
Body中将消息格式设置成json，上传方式设置为raw

更改id

点击send后下发

将消息方式改为get