SDN Project: Morphing Network Slices

Morphing Network Slices

Exam project for Softwarized and Virtualized Mobile Networks
University of Trento - Prof. Fabrizio Granelli

Download

git clone https://github.com/RED-PAND4/SDN-Project.git

Prerequisites

• Linux OS (tested on Ubuntu 20.04)
• Ryu
• Mininet
• Python & Python3

Comands for morphing :

start controller

ryu-manager morph_controller.py

run network

sudo python3 morph_network.py

---

command

 Enter command (bus, ring, star, cli, quit): bus

 Enter command (bus, ring, star, cli, quit): ring

 Enter command (bus, ring, star, cli, quit): star

 Enter command (bus, ring, star, cli, quit): cli -> enter mininet CLI for mininet command

 Enter command (bus, ring, star, cli, quit): quit -> end all

---

help

you need to wait the spanning tree before trying to ping the hosts, it ends when you see the "/FORWARD" at the end of the line in the controller terminal or you can wait 40-50 seconds from when you decide the topology

RYU-Api-Solution

1. Making sure Mininet is clear and all Ryu controllers instances are terminated:

sudo mn -c ; sudo fuser -k 6633/tcp

2. Starting the network with Mininet:

sudo mn --custom ryu_api_solution/network.py --controller remote --topo test --arp

3. Run Ryu controller with rest api:

python3 ryu_api_solution/run_controller.py 

That's how the physical network looks like:

4. Run our app to slice the network

python3 ryu_api_solution/slice_topology.py 

Now the network has been sliced: "red" host can only communicate with "red" hosts and the same is for the "blue" ones

5. Simulate a link down between s2 and s5

mininet> link s2 s5 down

6. Run our app to solve the broken link

python3 ryu_api_solution/solve_link_down.py

Finally we reprogrammed two of the switches, to overcome the use of the link between s2 and s5 and restore the functionality of the network.