2019 SDN上机第6次作业

1.  实验拓扑

• 实验拓扑图：
  

• 要求：使用python脚本生成拓扑，并连接ryu

from mininet.topo import Topo
class Mytopo(Topo):
    def __init__(self):
        Topo.__init__(self)
        s=[]
        for i in range(2):
         sw = self.addSwitch('s{}'.format(i+1))
         s.append(sw)
        self.addLink(s[0],s[1])
        count=1
        for two in s:
         for i in range(3):
          host = self.addHost('h{}'.format(count))
          self.addLink(two,host)
          count += 1
topos = {'mytopo': (lambda:Mytopo())}

sudo mn --custom MyTopo.py --topo mytopo --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13

使用pingall命令测试连通性

打开ryu rest服务器

2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN

# flow.sh
# flow.sh
curl -X POST -d '{
    "dpid":1, # 交换机s1
    "match":{
        "in_port":1 # 端口1
    },
    "actions":[
        {
            "type": "PUSH_VLAN",
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD", # 打tag
            "field": "vlan_vid",
            "value": 4097 # value = 4096 + dl_vlan
        },
        {
            "type": "OUTPUT",
            "port": 4 # 转发端口
        }
    ]
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 1,
    "match":{
        "in_port":2
    },
    "actions":[
        {
            "type": "PUSH_VLAN",
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4098
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 1,
    "match":{
        "in_port":3
    },
    "actions":[
        {
            "type": "PUSH_VLAN",
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4099
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 1,
    "match":{
        "dl_vlan": "1" # tag
    },
    "actions":[
        {
            "type": "POP_VLAN", # 去除tag
        },
        {
            "type": "OUTPUT",
            "port": 1
        }
    ] 
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 1,
    "match":{
        "dl_vlan": "2"
    },
    "actions":[
        {
            "type": "POP_VLAN",
        },
        {
            "type": "OUTPUT",
            "port": 2
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 1,
    "match":{
        "dl_vlan": "3"
    },
    "actions":[
        {
            "type": "POP_VLAN",
        },
        {
            "type": "OUTPUT",
            "port": 3
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid":2,
    "match":{
        "in_port":1
    },
    "actions":[
        {
            "type": "PUSH_VLAN",
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4097
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' 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": 4098
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 2,
    "match":{
        "in_port":3
    },
    "actions":[
        {
            "type": "PUSH_VLAN",
            "ethertype": 33024
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",
            "value": 4099
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 2,
    "match":{
        "dl_vlan": "1"
    },
    "actions":[
        {
            "type": "POP_VLAN",
        },
        {
            "type": "OUTPUT",
            "port": 1
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 2,
    "match":{
        "dl_vlan": "2"
    },
    "actions":[
        {
            "type": "POP_VLAN",
        },
        {
            "type": "OUTPUT",
            "port": 2
        }
    ]
}' http://localhost:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 2,
    "match":{
        "dl_vlan": "3"
    },
    "actions":[
        {
            "type": "POP_VLAN",
        },
        {
            "type": "OUTPUT",
            "port": 3
        }
    ]
}' http://localhost:8080/stats/flowentry/add

使用命令安装curl

$ sudo apt install curl

使用命令

$ sudo sh ./flow.sh

ovs查看流表

测试连通性：

3.对比两种方法，写出你的实验体会

两种方法虽然目的一样，但使用Ryu的REST API下发流表来实现的话相对来说更加灵活容易修改，且直接查看代码也更加直观清晰，易于理解，操作也更为简单。