Secure TLS connection

At this point, you have a pretty good migration story, having already developed your application to work with existing infrastructure, and on your way to flip more devices. You might be wondering if you should encrypt the messages between the controller and the network devices. In fact, you might be wondering why we waited this long to discuss this topic.

There are several reasons:

• During development and initial migration, you want to have as little moving variable as possible. It is difficult enough to do something new; you do not need to worry about encryption if you don't have to.
• Sometimes for troubleshooting, you might not have a switch that can capture packets natively or the switch not having enough buffer to perform verbose captures. You would be required to do tcpdump outside of your two endpoints.
• You may already have your own PKI infrastructure, if that is the case, please follow your own cert generation and steps for signing by your own certificate authority...