2019 SDN上机第6次作业

1.实验拓扑

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 )
        L1 = 2

        s = []
       
             
        for i in range( L1 ):
                sw = self.addSwitch( 's{}'.format( i + 1 ) )
                s.append( sw )
    
        
        count = 1
        for sw1 in s:
                for i in range(3):
                    host = self.addHost( 'h{}'.format( count ) )
                    self.addLink( sw1, host )
                    count += 1
    self.addLink(s[0],s[1])
topos = { 'mytopo': ( lambda: MyTopo() ) }

2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN

对交换机S1的配置流表sh文件如下（端口S2参照S1稍作修改即可）
用sudo chmod +x ctl.sh+sudo ./ctl.sh两个命令下发流表

# ctl.sh
curl -X POST -d '{
    "dpid": 1,                      #交换机S1
    "priority":1,
    "match":{
        "in_port":1                 #设置对端口1进来的包操作
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     # 给进入交换机的包打上vlan_tag
            "ethertype": 33024      
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     # field值为4096+vlan_id
            "value": 4096            # 设置field的值为4096即vlan_id的值为0
        },
        {
            "type": "OUTPUT",
            "port": 4               #操作为从端口4转发
        }
    ]
 }' http://127.0.0.1:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 1,                      #交换机S1
    "priority":1,
    "match":{
        "in_port":2                 #设置对端口2进来的包
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     # 给进入交换机的包打上vlan_tag
            "ethertype": 33024       
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     # field值为4096+vlan_id
            "value": 4097            # 设置field的值为4097即vlan_id的值为1
        },
        {
            "type": "OUTPUT",
            "port": 4               #操作为从端口4转发
        }
    ]
 }' http://127.0.0.1:8080/stats/flowentry/add


curl -X POST -d '{
    "dpid": 1,                      #交换机S1
    "priority":1,
    "match":{
        "in_port":3                 #设置对端口3进来的包操作
    },
    "actions":[
        {
            "type": "PUSH_VLAN",     # 给进入交换机的包打上vlan_tag
            "ethertype": 33024       # 帧类型0x8100(=33024): 表示IEEE 802.1Q的VLAN数据帧
        },
        {
            "type": "SET_FIELD",
            "field": "vlan_vid",     # field值为4096+vlan_id
            "value": 4098            # 设置field的值为4098即vlan_id的值为2
        },
        {
            "type": "OUTPUT",
            "port": 4               #操作为从端口4转发
        }
    ]
 }' http://127.0.0.1:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 1,                      #交换机S1
    "priority":1,
    "match":{
        "dl_vlan": "0"              #对dl_vlan即vlan_id为0进来的包
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 给进入交换机的包去除 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 1               #从端口1转发
        }
    ]
 }' http://localhost:8080/stats/flowentry/add

curl -X POST -d '{
    "dpid": 1,
    "priority":1,
    "match":{
        "dl_vlan": "1"              #对dl_vlan即vlan_id为1进来的包
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 给进入交换机的包去除 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 2               #从端口2转发
        }
    ]
 }' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
    "dpid": 1,          
    "priority":1,
    "match":{
        "dl_vlan": "2"              #对dl_vlan即vlan_id为1进来的包
    },
    "actions":[
        {
            "type": "POP_VLAN",     # 给进入交换机的包去除 vlan_tag
        },
        {
            "type": "OUTPUT",
            "port": 3               #从端口2转发
        }
    ]
 }' http://localhost:8080/stats/flowentry/add