2019 SDN上机第6次作业

1.实验拓扑

• 构建拓扑代码

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 ):
    "Simple topology example."
 
    def __init__( self ):
        "Create custom topo."
 
        Topo.__init__( self )
    switchs = []
        for i in range(2):
            sw = self.addSwitch("s{}".format(i + 1))
            switchs.append(sw)
    
    self.addLink(switchs[0], switchs[1],4,4)    

    count = 1
        for sw in switchs:
            for i in range(3):
                h = self.addHost("h{}".format(count))
                self.addLink(sw, h,i+1,1)
                count += 1
        
topos = { 'mytopo': ( lambda: MyTopo() ) }

• 构建成功
  

• 查看端口连接情况
  

• 连接ryu控制器
  

2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN

• 交换机2流表：

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

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

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

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

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

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

• 交换机1流表参照交换机1

• 运行结果
  
• 查看流表

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

sudo ovs-ofctl -O OpenFlow13 dump-flows s2

• pingall查看主机连通情况
  

• 查看图形界面
  

3.对比两种方法，写出你的实验体会

• 本次实验不用安装软件真是太开心了，果然做的很快
• ryu可以一次性下发流表，相比ovs-ofctl简单易懂很多，通用性更高。