NBAR2 Auto-learn

Marvelous technology.

A follow-up post for NBAR technology, a thing that you don't want to miss...

NBAR2 Auto-learn improves classification of traffic not otherwise recognized by NBAR2 protocols.

For generic HTTP or SSL traffic, NBAR2 can identify the hostname from packet header fields.
For unknown traffic, it can track top-occurring server-side ports and sockets.
These mechanisms facilitate creating custom protocols to better classify the otherwise generic or unknown traffic.

Follow the link for more specifications.

Further, read.

Deploying QoS for Application PerformanceOptimization.