建一个简单的模型，使用一个单交换机，然后链接n个主机形成拓扑，然后对每个链路设置带宽，延迟时间，和丢包率。
这里就选择建一个单交换机和六个主机的作为例子。
创建py脚本生成拓扑：写一个类生成一个单交换机和六个主机的拓扑，并且给每个主机和交换机之间的连接赋予100m的带宽，5ms的延迟和1%的丢包率。然后通过pingall函数测试连接，iperf函数测试主机间的带宽，
1 from mininet.topo import Topo 2 from mininet.net import Mininet 3 from mininet.node import CPULimitedHost 4 from mininet.link import TCLink 5 from mininet.util import dumpNodeConnections 6 from mininet.log import setLogLevel 7 ?8 ?9 class SingleSwitchTopo(Topo):10 ????def __init__(self, n=2, **opts):11 ????????Topo.__init__(self, **opts)12 ????????switch = self.addSwitch(‘s1‘)13 ????????for h in range(n):14 ????????????# Each host gets 50%/n of system CPU15 ????????????host = self.addHost(‘h%s‘ % (h + 1), cpu=.5/n)16 ????????????# 100 Mbps, 5ms delay, 1% Loss, 1000 packet queue17 ????????????self.addLink(host, switch, bw=100, delay=‘5ms‘, loss=1,18 ?????????????????????????max_queue_size=1000, use_htb=True)19 20 21 def perfTest():22 ????topo = SingleSwitchTopo(n=6)23 ????net = Mininet(topo=topo, host=CPULimitedHost, link=TCLink)24 ????net.start()25 ????print "Dumping host connections"26 ????dumpNodeConnections(net.hosts)27 ????print "Testing network connectivity"28 ????net.pingAll()29 ????print "Testing bandwidth between h1 and h4"30 ????h1, h4 = net.get(‘h1‘, ‘h4‘)31 ????net.iperf((h1, h4))32 ????print "Testing bandwidth between h1 and h6"33 ????h1, h6 = net.get(‘h1‘, ‘h6‘)34 ????net.iperf((h1, h6))35 ????net.stop()36 37 38 if __name__ == ‘__main__‘:39 ????setLogLevel(‘info‘)40 ????perfTest()
ps:如果直接执行出现错误找不到py解释器的话，在代码开头加上#!/usr/bin/python。或者直接使用
1 sudo python 文件名.py
执行
结果如下图所示：
瞎搞一波，再试试两个交换机相互连接，然后分别下挂三个主机。link全部赋予10m带宽，5ms延迟和0%的丢包率。
1 from mininet.topo import Topo 2 from mininet.net import Mininet 3 from mininet.node import CPULimitedHost 4 from mininet.link import TCLink 5 from mininet.util import dumpNodeConnections 6 from mininet.log import setLogLevel 7 ?8 ?9 class SingleSwitchTopo(Topo):10 ????def __init__(self, n=2, **opts):11 ????????Topo.__init__(self, **opts)12 ????????switch1 = self.addSwitch(‘s1‘)13 ????????switch2 = self.addSwitch("s2")14 ????????self.addLink(switch1, switch2, bw=10, delay=‘5ms‘,15 ?????????????????????loss=0, max_queue_size=1000, use_htb=True)16 ????????for h in range(n/2):17 ????????????host = self.addHost(‘h%s‘ % (h + 1), cpu=.5/n)18 ????????????self.addLink(host, switch1, bw=10, delay=‘5ms‘, loss=0,19 ?????????????????????????max_queue_size=1000, use_htb=True)20 ????????for h in range(n/2, n):21 ????????????host = self.addHost(‘h%s‘ % (h + 1), cpu=.5/n)22 ????????????self.addLink(host, switch2, bw=10, delay=‘5ms‘, loss=0,23 ?????????????????????????max_queue_size=1000, use_htb=True)24 25 26 def perfTest():27 ????topo = SingleSwitchTopo(n=6)28 ????net = Mininet(topo=topo, host=CPULimitedHost, link=TCLink)29 ????net.start()30 ????print "Dumping host connections"31 ????dumpNodeConnections(net.hosts)32 ????print "Testing network connectivity"33 ????net.pingAll()34 ????print "Testing bandwidth between h1 and h3"35 ????h1, h3 = net.get(‘h1‘, ‘h3‘)36 ????net.iperf((h1, h3))37 ????print "Testing bandwidth between h4 and h6"38 ????h4, h6 = net.get(‘h4‘, ‘h6‘)39 ????net.iperf((h4, h6))40 ????net.stop()41 42 43 if __name__ == ‘__main__‘:44 ????setLogLevel(‘info‘)45 ????perfTest()结果如下图：
Mininet简单性能测试
原文地址：https://www.cnblogs.com/pullself/p/10192839.html