Mininet实验 设置带宽之简单性能测试

原文：设置带宽之简单性能测试

实验：

实现一个单个交换机的拓扑，添加一个交换机，和N个主机到网络中。交换机和主机之间的每个链路能够设置带宽、延迟时间、以及丢包率。创建一个包含一个交换机和四个主机的网络，使用iperf测试主机之间的带宽。

拓扑图如下所示：

touch  mymininet1.py //注意：原文前后python程序名称不一致

vim mymininet.py

#2016/9/29 Created by Wasdns, FZU, SDNLab

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import CPULimitedHost
from mininet.link import TCLink
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel

class SingleSwitchTopo(Topo):
"Single switch connected to n hosts."
def __init__(self, n=2, **opts):
Topo.__init__(self, **opts)
switch = self.addSwitch('s1')
for h in range(n):
#Each host gets 50%/n of system CPU
host = self.addHost('h%s' % (h + 1), cpu=.5/n)
#10 Mbps, 5ms delay, 0% Loss, 1000 packet queue
self.addLink(host, switch, bw=10, delay='5ms', loss=0, max_queue_size=1000, use_htb=True)

def perfTest():
"Create network and run simple performance test"
topo = SingleSwitchTopo(n=4)
net = Mininet(topo=topo,host=CPULimitedHost, link=TCLink)
net.start()
print "Dumping host connections"
dumpNodeConnections(net.hosts)
print "Testing network connectivity"
net.pingAll()
print "Testing bandwidth between h1 and h4"
h1, h4 = net.get('h1', 'h4')
net.iperf((h1, h4))
net.stop()

if __name__=='__main__':
setLogLevel('info')
perfTest()

chmod +x mymininet1.py //这步其实没有那么必要

./mymininet1.py
//或者
python mymininet.py
//都可以

结果：

结论：