2019 SDN上机第1次作业
2019 SDN上机第1次作业
实验任务
- 安装轻量级网络仿真工具Mininet
- 用字符命令搭建如下拓扑,要求写出命令
- 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。
- 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)
实验过程
1. 安装轻量级网络仿真工具Mininet
安装git
sudo apt-get install git
下载代码
git clone git://github.com/mininet/mininet
然后进入mininet/util目录,执行安装命令-a表示全部安装
cd mininet
cd util
sudo ./install.sh -a
测试
sudo mn
```‘
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103205716212-280386204.jpg)
**2. 用字符命令搭建如下拓扑,要求写出命令**
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203824926-2014722327.png)
命令行输入
$ sudo mn --topo linear,3
实现结果
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203950090-623658674.jpg)
第二个拓扑
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203838040-1112929506.png)
命令行输入
$ sudo mn --topo tree,fanout=3,depth=2
实现结果
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203959078-1966216897.jpg)
**3. 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。**
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203854660-844860445.png)
实现结果
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103204009576-608235479.jpg)
命令行输入
$ xterm h1 h2 h3
每个主机输入
$ ifconfig
实现结果
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103204018075-796549345.jpg)
**4. 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s1~s6,h1~h8,并且链路正确,请给出Mininet相关截图)**
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103203911310-1143969553.png)
代码
!/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."
Topo.__init__( self )
L1 = 2
L2 = L1 * 2
L3 = L2
c = []
a = []
e = []
for i in range( L1 ):
sw = self.addSwitch( 's{}'.format( i + 1 ) )
c.append( sw )
for i in range( L2 ):
sw = self.addSwitch( 's{}'.format( L1 + i + 1 ) )
a.append( sw )
for i in range( L1 ):
sw1 = c[i]
for sw2 in a[i/2::L1/2]:
self.addLink( sw2, sw1 )
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() ) }
实验结果
![](https://img2018.cnblogs.com/blog/1793092/201911/1793092-20191103204028367-2022562277.jpg)