assignment2

Assignment 2 (Clos topology)

Overview

In this assignment we had to implement a Clos topology for data centers using the OpenFlow protocol. The topology had to be implemented using the POX. The topology is created using the following two parameters:

• c or --core : The number of core switches.
• f or --fanout : The number of child nodes each node has.

The Clos topology has the following three layers:

• Core layer: The core layer is the top layer of the topology. It contains the c number of core switches.
• Aggregation layer: The aggregation layer is the middle layer of the topology. It contains the c*f number of aggregation switches.
• Edge layer: The edge layer is the bottom layer of the topology. It contains the c*f*f number of edge switches. Each edge switch is connected to f hosts.

The topology of a network with parametes c=1 and f=2 is the following:

Files Structure (from assignmen2 foler)

• assignment2.pdf: Complete assignment description.
• src_code/: The folder containing the requrired code.
  • CloudNetController.py: The python file containing the code of the controller.
  • clos_topo.py: The python file used to initialize the topology.
  • firewall_policies.csv: A CSV file containing the firewall policies.
  • migration_events.csv: A CSV file containing the migration events.
  • tcp_sender.py, tcp_receiver.py, udp_sender.py, udp_receiver.py:Python files used to send and receive TCP and UDP packets.

How to run

1. Requirements:
   • Mininet
   • POX
   • SimpleLoadBalancer.py needs to be in the /pox/ext folder.
2. Run the following commands:
   • sudo python clos_topo.py -c <# of core switches> -f <# of fanout> (to create the topology)
   • /pox.py openflow.discovery CloudNetController --firewall_capability=<True|False> --migration_capability=<True|False> (to run the load balancer) (This command needs to be run from the pox folder)