1. ECE544: Software Assignment 3
Abhigyan Sharma

2. Step 1: setup SSH connection to VM
If running mininet directly on linux, you are all set!
On virtualbox,
Create network-only adapter for VM
Edit /etc/network/interfaces
SSH into mininet

3. Step 2: Get software
Download assignment scripts LINK to mininet using “wget <LINK>”
Or download to your laptop and “scp” to mininet VM
Install iperf3
** Do NOT use “sudo apt-get install iperf3”, since it does not install iperf3.1 **
Use provided script, simply run:
./install_iperf3.sh

4. Step 3: Run script to generate mininet topology
cd <script_folder>
sudo ./gen_leaf_spine.py <num_spine> <num_leaf>
For now: num_spine = 1 only
Also enables ssh to each host (e.g. ssh )
If stuck:
sudo ./cleanup.py
Leaf-spine topology s1 s2 s3 s4 s5 s6 h1 h2 h3 h4

5. Step 4: automatic ssh login to each host in mininet
Start by creating another ssh window to mininet
Try “ssh ”
It needs password and prevents traffic gen scripts to work!
Solution (2 commands)
ssh-keygen
Do not enter passphrase
Will create your public private key pair
cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
Now try “ssh ”
Should work without password

6. Step 5: run traffic generation script
Format of traffic matrix file
One line per flow
<src_leaf> <dst_leaf>
Sample file: traffic_matrix in script folder
cd <script_folder>
./gen_traffic.py <traffic_matrix_file>
Multi-threaded program
A thread create iperf server at dst_leaf and client at src_leaf and measures throghput
Terminates iperf processes
Output per-flow and total throughput
Raw output: /home/mininet/output

7. What to submit Repeat these steps
Create a (1, 4) topology and evaluate total and per-flow throughput with 1, 4 and 16 flows
Submit report with results
Expected time (<=3 hours!)