Creating Links Between Mininet Switches on Different Machines

What will you learn?

In this tutorial, you will master the art of connecting Mininet switches emulated on different machines to enable seamless communication between them.

Introduction to the Problem and Solution

To establish a network where Mininet switches on separate machines can communicate effectively, it is essential to create links between these switches. By utilizing Mininet’s Python API, we can define these connections and bridge switches across different hosts. This setup not only facilitates distributed networking experimentation but also enables testing scenarios in varied network environments.


# Import necessary libraries
from import Mininet
from mininet.topo import Topo

# Create custom topology class inheriting from Topo class
class CustomTopology(Topo):
    def build(self):
        # Add switches s1 and s2 to the topology
        switch1 = self.addSwitch('s1')
        switch2 = self.addSwitch('s2')

# Create an instance of the custom topology class
topology = CustomTopology()

# Initialize Mininet network with the custom topology
net = Mininet(topo=topology)

# Start the network with defined controllers (optional)

# Connect switches by creating links between them (example: s1-s2)
switch1 = net.get('s1')
switch2 = net.get('s2')
net.addLink(switch1, switch2)

# Execute custom commands or tests here

# Stop the network once done with experiments

# Copyright PHD



In this solution: – We define a custom topology that includes multiple switches. – We create a network instance using our defined topology. – We establish a link between specific switches in the network. – Additional configurations or tests can be conducted within this emulated environment.

    How do I install Mininet?

    Mininet can be installed by following the installation instructions provided in their official documentation.

    Can I run distributed experiments using Mininets across different physical machines?

    Yes, it is possible to connect Mininet instances running on separate physical hosts through proper configuration.

    Do I need prior networking knowledge to utilize Mininets across multiple machines?

    While some networking understanding is beneficial, basic familiarity with networking concepts should suffice for setting up inter-machine connections in a simulated environment.

    Are there any performance considerations when linking switches across different hosts in Mininets?

    Performance may vary based on factors like network latency and bandwidth availability between connected machines. Consider these aspects while designing your experiments.

    Can I automate link creation between switches dynamically during runtime?

    With appropriate scripting utilizing tools like Python’s mininet library, dynamic link establishment between switches at runtime is achievable.

    Is it possible to simulate complex topologies involving multiple interconnected networks using this approach?

    Yes, by extending our example code and incorporating additional components as required, complex simulated networks spanning multiple machines can be created within a single emulation session.

    How does linking differ from connecting nodes in traditional computer networks?

    In traditional networks, linking refers to establishing logical or physical connections directly among devices such as routers or switches. In software-defined networking environments like Mininets, links are often virtualized for easier management and configuration flexibility.

    Can I monitor traffic flow through linked switches during experimentation in my setup?

    By integrating monitoring tools or packet sniffers within your experiment scripts or configurations, you can observe traffic patterns flowing through connected switches accurately.


    Establishing links between Mininet switches emulated on distinct hosts offers immense potential for simulating diverse networking scenarios. Experimentation within such setups aids in understanding real-world network behaviors without necessitating expensive hardware deployments. This tutorial equips you with the skills needed to delve deeper into advanced networking concepts, empowering you to explore more resources available online.

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