Introduction to NBAR Protocol Discovery
The NBAR Protocol Discovery feature provides an easy way of discovering the application protocols passing through an interface. Network Based Application Recognition (NBAR) determines which protocols and applications are currently running on the network. With Protocol Discovery, you can discover any protocol traffic that is supported by NBAR and obtain statistics that are associated with that protocol.
NBAR provides several classification features that identify applications and protocols from Layer 4 through Layer 7. NBAR is also used in Cisco Application Visibility and Control (AVC). With AVC, NBAR provides better application performance through better QoS and policing, and provides finer visibility about the network that is being used.