Hi everyone , 

Sharing a small project I did couple months ago. I was tasked to present how could the licence SD-WAN+ help our organization to improve user experience with VOIP issues.

Current challenge :  Most of our sites have 2 internet links. Most of the time these links are on fiber and are very reliable. However , we do have some challenges with ADSL and Coax. These links can experience loss and latency at any moment and are not as reliable as fiber.

What if we could create a WAN policy that would steer traffic to the best uplink possible ? This is possible with the licence SD-WAN+ and SD-Internet polices.

But how can you test this in a lab would you say ? In fact this is pretty easy with a Raspberry PI. You have to install and configure TC and a bridge between 2 interfaces on the Raspberry Pi. There is a great guy named Nathan Wiens that works for Cisco/Meraki that has done all the hard work and provides a repo of his work : https://github.com/nathanwiens/merakiwanemulator ( there is also a cradlepoint version of this code that is newer and probably bug-free )

The testing setup is pretty simple. MX68CW connected to the SAME ISP, but on WAN2 there is a Raspberry Pi intercepting the traffic ( Man in the Middle kind of )

I was able to quickly adjust the latency/loss/jitter via a nice Web interface that runs on the RaspberryPi. You could also do these changes via the cli of the RPI.

Teams calls were horrible with that latency and loss as shown with this picture :

After creating the SD-Internet policies everything was perfect :

In conclusion, I was able to prove that SD-Internet policies were crucial to our users. Complaints about VOIP issues related to loss and latency are almost down to 0.

Big big big thanks to @NathanW for the github repo.