1.实验拓扑
from mininet.topo import Topo
from mininet.net import Mininet
class MyTopo( Topo ):
"Simple topology example."
def __init__( self ):
"Create custom topo."
# Initialize topology
Topo.__init__( self )
s1 = self.addSwitch('s1')
i = 0
while i<=3:
host = self.addHost('h{}'.format(i))
self.addLink(s1,host)
i = i+1
s2 = self.addSwitch('s2')
while i<=6:
host = self.addHost('h{}'.format(i))
self.addLink(s2,host)
i = i+1
self.addLink(s1,s2)
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
i.开启ryu restful服务器
ii.使用curl发送流表
$ sudo sh ./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
iii.查看流表
iv.再次测试连通性
3.对比两种方法，写出你的实验体会
使用rest api并使用shell脚本下发流表的方式，相比Open vSwitch在命令行下发流表，要方便许多。
首先是使用了json格式，流表的结构较为清晰易懂。其次是易于修改，并且脚本可以多次执行，而命令行方式修改和执行则十分麻烦，需要疯狂↑↓←→。
中间还经历了一个小插曲，创建拓扑的时候把OpenFlow的l给大写了，导致发流表时一直404，弄了好久才发现。