1.实验拓扑
实验拓扑图如下：
搭建代码如下：
创建py文件,并编写py代码，代码如下：
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):
def __init__(self):
Topo.__init__(self)
s=[]
for i in range(2):
sw = self.addSwitch('s{}'.format(i+1))
s.append(sw)
count=1
for sw in s[0:2]:
for i in range(3):
host = self.addHost('h{}'.format(count))
self.addLink(sw,host)
count += 1
self.addLink(s[0],s[1])
topos = {'mytopo': (lambda:Mytopo())}
搭建结果如下
使用net查看拓扑
使用pingall发现都不连通
进入文件夹的ryu文件夹下的app,通过以下的命令连接ryu控制器，结果如下图
ryu-manager ofctl_rest.py
2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN
按照实验二编写如下脚本，脚本为all.sh，内容如下：
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"in_port":1
},
"actions":[
{
"type": "PUSH_VLAN", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4096 # 设置vlan_id的值
},
{
"type": "OUTPUT",
"port": 4
}
]
}' http://127.0.0.1:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"in_port":2
},
"actions":[
{
"type": "PUSH_VLAN", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4097 # 设置vlan_id的值
},
{
"type": "OUTPUT",
"port": 4
}
]
}' http://127.0.0.1:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"in_port":3
},
"actions":[
{
"type": "PUSH_VLAN", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4098 # 设置vlan_id的值
},
{
"type": "OUTPUT",
"port": 4
}
]
}' http://127.0.0.1:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"dl_vlan": "0"
},
"actions":[
{
"type": "POP_VLAN", # 给进入交换机的包去除 vlan_tag
},
{
"type": "OUTPUT",
"port": 1
}
]
}' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"dl_vlan": "1"
},
"actions":[
{
"type": "POP_VLAN", # 给进入交换机的包去除 vlan_tag
},
{
"type": "OUTPUT",
"port": 2
}
]
}' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 1,
"priority":1,
"match":{
"dl_vlan": "2"
},
"actions":[
{
"type": "POP_VLAN", # 给进入交换机的包去除 vlan_tag
},
{
"type": "OUTPUT",
"port": 3
}
]
}' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
"dpid": 2,
"priority":1,
"match":{
"in_port":1
},
"actions":[
{
"type": "PUSH_VLAN", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4096 # 设置vlan_id的值
},
{
"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", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4097 # 设置vlan_id的值
},
{
"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", # s1将从主机发来的数据包打上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", # 设置VLAN ID
"value": 4098 # 设置vlan_id的值
},
{
"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", # 给进入交换机的包去除 vlan_tag
},
{
"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", # 给进入交换机的包去除 vlan_tag
},
{
"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", # 给进入交换机的包去除 vlan_tag
},
{
"type": "OUTPUT",
"port": 3
}
]
}' http://localhost:8080/stats/flowentry/add
使用sudo sh '/home/ubuntu/Desktop/all.sh' 运行脚本，可以发现ryu控制器已经接受了流表项，结果如下
查看s1和s2的流表，如下如所示：
然后pingall，发现可以ping的通了，由此下发流表成功，得到了和实验二一样的结果
3.对比两种方法，写出你的实验体会
两个方法的意思是差不多的，有了实验二的理解，要做这个实验就显得比较简单，因为每个流表项都可以较快的理解。实验二中是使用ovs了命令直接在交换机上下发流表实现VLAN，这一次是用Ryu控制器来实现，而且相比于上一次实验，本次的内容可以保存在文件中，需要修改的时候也只要修改几个参数，不会像第一次实验那样关闭命令行就消失掉，这样操作起来会比较方便，特别是我们现在做这些题目很不熟悉，经常会因为一些七七八八的原因重新做实验。所以我觉得这种方法会更好。