1、使用Mininet可视化工具,生成下图所示的拓扑,并保存拓扑文件名为学号.py。
2、使用Mininet的命令行生成如下拓扑:
a) 3台交换机,每个交换机连接1台主机,3台交换机连接成一条线。
b) 3台主机,每个主机都连接到同1台交换机上。
3、在2 b)的基础上,在Mininet交互界面上新增1台主机并且连接到交换机上,再测试新拓扑的连通性。
4、编辑基本要求第1步保存的Python脚本,添加如下网络性能限制,生成拓扑:
a) h1的cpu最高不超过50%;
b) h1和s1之间的链路带宽为10,延迟为5ms,最大队列大小为1000,损耗率50。
#!/usr/bin/env python
from mininet.net import Mininet
from mininet.node import Controller, RemoteController, OVSController
from mininet.node import CPULimitedHost, Host, Node
from mininet.node import OVSKernelSwitch, UserSwitch
from mininet.node import IVSSwitch
from mininet.cli import CLI
from mininet.log import setLogLevel, info
from mininet.link import TCLink, Intf
from subprocess import call
def myNetwork():
net = Mininet( topo=None,
build=False,
ipBase='10.0.0.0/8')
info( '*** Adding controller\n' )
c0=net.addController(name='c0',
controller=Controller,
protocol='tcp',
port=6633)
info( '*** Add switches\n')
s2 = net.addSwitch('s2', cls=OVSKernelSwitch)
s1 = net.addSwitch('s1', cls=OVSKernelSwitch)
info( '*** Add hosts\n')
h3 = net.addHost('h3', cls=Host, ip='10.0.0.3', defaultRoute=None)
h1 = net.addHost('h1', cls=Host, ip='10.0.0.1', defaultRoute=None,cup=0.5)
h4 = net.addHost('h4', cls=Host, ip='10.0.0.4', defaultRoute=None)
h2 = net.addHost('h2', cls=Host, ip='10.0.0.2', defaultRoute=None)
info( '*** Add links\n')
net.addLink(h1, s1, delay='5ms',max_queue_size=1000, loss=50, use_htb=True)
net.addLink(h2, s1)
net.addLink(s1, s2)
net.addLink(h3, s2)
net.addLink(s2, h4)
info( '*** Starting network\n')
net.build()
info( '*** Starting controllers\n')
for controller in net.controllers:
controller.start()
info( '*** Starting switches\n')
net.get('s2').start([c0])
net.get('s1').start([c0])
info( '*** Post configure switches and hosts\n')
CLI(net)
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
myNetwork()
标签:info,mininet,拓扑,实践,import,SDN,cls,net,s1
From: https://www.cnblogs.com/kukudehua/p/16708676.html