By using NBAR2 in the class-map, routers can identify traffic by NBAR2 application signature. This allows per-application policy control such as QoS, e.g. limit traffic rate for Netflix, Pandora, and iTunes applications, or guarantee bandwidth for business applications such as WebEx, Office 365, or Sharepoint.
Eye.lo stores and reports metrics down to the DSCP level per application and interface. This helps know whether a given application may have been misclassified when there is a DSCP-based QoS.