mininet_part3.md

Writing Custom Topology in Mininet

This tutorial helps to learn on writing mininet custom topology.

Introduction

mininet exposes the python API. We can create a custom topologies using the python API with few lines of code.

How to write Custom Topology in Mininet

Steps are below.

1. Import the python required libraries

from mininet.topo import Topo
from mininet.net import Mininet

2. Write the Topology definition class

class CustomTopo(Topo):
   def build(self):
       s1 = self.addSwitch('s1')
       h1 = self.addHost('h1')
       h2 = self.addHost('h2')
       self.addLink(h1, s1)
       self.addLink(h2, s2)

Important Topology definition APIs:

a. addSwitch,

b. addHost,

c. addLink

3. Start the Topology

a. Create the Topology object

b. Create the Mininet with Topology object

c. Start the Mininet

if __name__ == '__main__':
    topo = SingleSwitchTopo()
    net = Mininet(topo)
    net.start()

References:

1. https://github.com/mininet/mininet/wiki/Introduction-to-Mininet

2. https://github.com/mininet/mininet/tree/master/examples

3. http://mininet.org/api/annotated.html

# To read 4. https://kiranvemuri.info/dynamic-topology-changes-in-mininet-advanced-users-5c452f7f302a

4. https://stackoverflow.com/questions/43070043/mininet-wifi-custom-topology https://stackoverflow.com/questions/43070043/mininet-wifi-custom-topology