An application probe class (app-probe-class) defines the forwarding class and DSCP marking for each color over which BFD probes are sent. When router has app-probe-class configured, the BFD packets are sent for each SLA app-probe-class separately in a round-robin manner.
Example-1 : The below example shows an app_probe_class configured for REALTIME applications. forwarding_class has been referenced to CLASS-REALTIME class map which has been already defined as a policy object. The color of the tloc is public-internet and dscp marking has been set to 46.