一、安装轻量级网络仿真工具Mininet
git clone https://github.com/mininet/mininet
![image.png](https://upload-images.jianshu.io/upload_images/19526787-3b8df6e61920b9cf.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
cd mininet
./util/install.sh -a
![image.png](https://upload-images.jianshu.io/upload_images/19526787-e6c8c44f8c440759.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
二、用字符命令搭建如下拓扑,要求写出命令
- 拓扑
![image.png](https://upload-images.jianshu.io/upload_images/19526787-230ed71ce440b7b9.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 命令
sudo mn --topo=linear,3
- 结果
![image.png](https://upload-images.jianshu.io/upload_images/19526787-891e3606e774195e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![image.png](https://upload-images.jianshu.io/upload_images/19526787-3b99dafac6bb0700.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 拓扑
![image.png](https://upload-images.jianshu.io/upload_images/19526787-2f66bc2563bf22db.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 命令
sudo mn --topo=tree,depth=2,fanout=3
- 结果
![image.png](https://upload-images.jianshu.io/upload_images/19526787-d0a7e6ef1dc1f30e.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
![image.png](https://upload-images.jianshu.io/upload_images/19526787-66901eb2a07001fe.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
三、利用可视化工具搭建如下拓扑,并要求支持OpenFlow 1.0 1.1 1.2 1.3,设置h1(10.0.0.10)、h2(10.0.0.11)、h3(10.0.0.12),拓扑搭建完成后使用命令验证主机ip,查看拓扑端口连接情况。
- 拓扑
![image.png](https://upload-images.jianshu.io/upload_images/19526787-e93804a19057dac7.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
- 结果
![image.png](https://upload-images.jianshu.io/upload_images/19526787-21c191bc201f13b5.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)
四、利用Python脚本完成如下图所示的一个Fat-tree型的拓扑(交换机和主机名需与图中一致,即s1s6,h1h8,并且链路正确,请给出Mininet相关截图)
#!/usr/bin/python
#创建网络拓扑
"""Custom topology example
Adding the 'topos' dict with a key/value pair to generate our newly defined
topology enables one to pass in '--topo=mytopo' from the command line.
"""
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."
# Initialize topology
Topo.__init__( self )
L1 = 2
L2 = L1 * 2
c = []
a = []
# add core ovs
for i in range( L1 ):
sw = self.addSwitch( 's{}'.format( i + 1 ) )
c.append( sw )
# add aggregation ovs
for i in range( L2 ):
sw = self.addSwitch( 's{}'.format( L1 + i + 1 ) )
a.append( sw )
# add links between core and aggregation ovs
for i in range( L1 ):
sw1 = c[i]
for sw2 in a[i/2::L1/2]:
# self.addLink(sw2, sw1, bw=10, delay='5ms', loss=10, max_queue_size=1000, use_htb=True)
self.addLink( sw2, sw1 )
#add hosts and its links with edge ovs
count = 1
for sw1 in a:
for i in range(2):
host = self.addHost( 'h{}'.format( count ) )
self.addLink( sw1, host )
count += 1
topos = { 'mytopo': ( lambda: MyTopo() ) }
- 结果
![image.png](https://upload-images.jianshu.io/upload_images/19526787-ef7f2514f2c957cb.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)