The simple performance test of setting bandwidth in mininet experiment

Write in front

The experimental reference

• The experiment is written to Opendaylight, but it doesn't seem to have anything to do with ODL, or the local controller pox.
• Noteworthy: after the experiment must be used, mn-c command cleanup process . Otherwise, it causes the ping between the hosts, port occupancy and so on.
• Although it is a simple experiment, but I in the process by asking seniors, but also to the virtual controller understanding more in-depth, but also can be more in-depth experience in the software of SDN in the two words.

Experimental ideas

• Python script implements a custom topology
• Set the bandwidth, latency, and packet loss rate for the link
• Iperf testing the bandwidth performance between hosts

In short, a script solves all problems. The core of this experiment is to read scripts.

Experimental topology

Experiment Step 1: Build the environment

• Installing a mininet virtual machine

2. Create a script

• Enter the Mininet/custom directory, create the script mymininet.py and add the content:

#!/usr/bin/pythonfrom Mininet.topo Import topofrom mininet.net import mininetfrom mininet.node Import Cpulimitedhostfrom mininet.link Import tclinkfrom mininet.util import dumpnodeconnectionsfrom mininet.log Import    Setloglevelclass 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 R            Ange (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, packet queue Self.addlink (host, switch, bw=10, delay= ' 5ms ', loss=0, max_q ueue_size=1000, Use_htb=true) def perftest (): "Create Network and run simple performance test" topo = Singleswitchtop    O (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 ()

• This script has already written everything, including the link bandwidth settings, pingall instructions, and iperf instructions. Just run the observation process.
• Understanding scripts is the key!

Run the script

python mymininet.py或者chmod +x mymininet.py #添加文件执行属性./mymininet.py

Effect

Summary of the experiment and the matters needing attention

• Create a mininet script from a Python script to set the bandwidth, latency, packet loss rate, etc. (bw=10,delay= ' 5ms ', loss=0,max_queue_size=1000,use_htb=true) between device links, There is a throttling effect on the device, and the performance of the test host is performed through Iperf.
• Caveats:mn-c cleanup Process .

The simple performance test of setting bandwidth in mininet experiment