How to run Python Code in mininet

Question

I write a simple topology with Python in mininet, but I dont know how to execute my code,I searched in internet and find several methods. which one is correct? And what is the difference between them?

1. Method 1:

    sudo mn --custom ~/mininet/custom/filename.py --topo mytopo 

2. Method 2:

    sudo phython filename.py 

3. Method 3:

    chmod u+x filename.py sudo ./filename.py 

Answer 1

• Method 1 is the classical method to deploy a custom topology in Mininet. You can specify in the same command the controller, like this :

   sudo mn --custom ~/mininet/custom/filename.py --topo mytopo --controller=remote,ip=[CONTROLLER_IP],port=6633 

  or if you don't, Mininet will use the default.

• Method 2 executes the [FILENAME] file. Note that here you have to specify the controller which you will use inside the python script . This is the difference with Method 1.

• Method 3 makes the [FILENAME] file executable with the first command, and then executes it. It is the same as Method 2.