2019 SDN上机第6次作业

1.实验拓扑

• 实验拓扑

• 要求
  使用Python脚本完成拓扑搭建，并连接ryu控制器。
• python代码

from mininet.topo import Topo
class MyTopo( Topo ):
    "Simple topology example."
 
    def __init__( self ):
        Topo.__init__(self)
        sw1 = self.addSwitch('s1')
        sw2 = self.addSwitch('s2')

        h1 = self.addHost('h1')
        h2 = self.addHost('h2')
        h3 = self.addHost('h3')
        h4 = self.addHost('h4')
        h5 = self.addHost('h5')
        h6 = self.addHost('h6')

        self.addLink(h1,sw1,1,1)
        self.addLink(h2,sw1,1,2)
        self.addLink(h3,sw1,1,3)
        self.addLink(sw1,sw2,4,4)
        self.addLink(h4,sw2,1,1)
        self.addLink(h5,sw2,1,2)
        self.addLink(h6,sw2,1,3)

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

• 使用下列命令建立拓扑

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

• 使用net查看拓扑

• 使用pingall查看连通性

2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN

• 进入RYU/ryu/ryu/app/gui_topology目录使用下列命令

ryu-manager gui_topology.py

• 脚本代码

#s1的脚本
#端口号1发来数据
curl -X POST -d '{
    "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": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add

#端口号2发来数据
curl -X POST -d '{
    "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": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add

#端口号3发来数据
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "in_port":3
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     
            "ethertype": 33024       
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     
            "value": 4098           
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add



#向端口1转发
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "0"
    },
    "actions":[
        {
            "type": "POP_VLAN",     
        },
        {
            "type": "OUTPUT",
            "port": 1
        }
    ]
}' http://localhost:8080/stats/flowentry/add

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

#向端口3转发
curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "2"
    },
    "actions":[
        {
            "type": "POP_VLAN",     
        },
        {
            "type": "OUTPUT",
            "port": 3
        }
    ]
}' http://localhost:8080/stats/flowentry/add

#s2的脚本
#端口号1发来数据
curl -X POST -d '{
    "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": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add

#端口号2发来数据
curl -X POST -d '{
    "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": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add

#端口号3发来数据
curl -X POST -d '{
    "dpid": 2,
    "priority":1,
    "match":{
        "in_port":3
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     
            "ethertype": 33024       
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",    
            "value": 4098            
        },
        {
            "type": "OUTPUT",
            "port": 4
        }
    ]
}' http://127.0.0.1:8080/stats/flowentry/add



#向端口1转发
curl -X POST -d '{
    "dpid": 2,
    "priority":1,
    "match":{
        "dl_vlan": "0"
    },
    "actions":[
        {
            "type": "POP_VLAN",    
        },
        {
            "type": "OUTPUT",
            "port": 1
        }
    ]
}' http://localhost:8080/stats/flowentry/add

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

#向端口3转发
curl -X POST -d '{
    "dpid": 2,
    "priority":1,
    "match":{
        "dl_vlan": "2"
    },
    "actions":[
        {
            "type": "POP_VLAN",     
        },
        {
            "type": "OUTPUT",
            "port": 3
        }
    ]
}' http://localhost:8080/stats/flowentry/add

• 将脚本代码保存在2.sh文件里，使用下列命令运行2.sh文件

• 由于某些玄学问题(有可能是ovs版本问题),出现以下错误

• 使用下列两条命令解决这个问题

sudo ovs-vsctl set bridge s1 datapath_type=netdev
sudo ovs-vsctl set bridge s2 datapath_type=netdev

• 然后再次运行脚本文件

• 使用下列命令分别查看s1， s2流表

sudo ovs-ofctl -O OpenFlow13 dump-flows s1
sudo ovs-ofctl -O OpenFlow13 dump-flows s2

• 查看连通性

3.对比两种方法，写出你的实验体会

两种方法的效果是一样的，但是ryu可以用脚本实现，比较方便，就是有可能出现问题