2019 SDN上机第6次作业
1.实验拓扑
(1)实验拓扑
(2)使用Python脚本完成拓扑搭建
Python脚本如下:
from mininet.topo import Topo
class MyTopo( Topo ):
"Simple topology example."
def __init__( self ):
# Initialize topology
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() ) }
输入如下命令，创建拓扑:
sudo mn --custom ./kkk.py --topo mytopo --controller=remote,ip=127.0.0.1,port=6653 --switch ovsk,protocols=OpenFlow13
(3)连接ryu控制器
在对应文件中打开终端，输入如下命令，连接ryu控制器:
ryu-manager ofctl_rest.py
输入pingall测试连通性:
输入net，查看各主机与交换机之间的端口情况:
2.使用Ryu的REST API下发流表实现和第2次实验同样的VLAN
(1)编写脚本
s1脚本如下:
#端口号1发来数据
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
#端口号2发来数据
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
#端口号3发来数据
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
#向端口1转发
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
#向端口2转发
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
#向端口3转发
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
s2脚本如下:
#端口号1发来数据
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
#端口号2发来数据
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
#端口号3发来数据
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
#向端口1转发
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
#向端口2转发
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
#向端口3转发
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
直接在终端执行:
s1和s2下发流表结果:
(2)使用如下命令，查看流表:
sudo ovs-ofctl -O OpenFlow13 dump-flows s1
sudo ovs-ofctl -O OpenFlow13 dump-flows s2
(3)再次输入pingall测试连通性:
3.对比两种方法，写出你的实验体会
这次实验做下来感觉还蛮顺利的，使用RYU控制器，整个实验过程还是比较有条理的，没有过多繁琐的操作。
对比起来，直接在Open vSwitch下发流表命令行过于繁琐，并且不能直观体现流表内容，而采用Ryu控制器的REST API下发的流表是直接编辑json格式的流表，界面会更清楚且容易理解，但是二者在思想和效果上是一致的。
