Class Based Forwarding (CBF) is a means for steering IP traffic into specific tunnels based on either the ingress DSCP values or based on “classes” which are derived from fields in the ingress packet headers and policies provisioned on the router. CBF may be used with SR-TE Policy or RSVP-TE colored tunnels.

Class based forwarding (CBF) is a means for steering network traffic into colored tunnels based on one or more fields of the ingress traffic. Rephrased, CBF is forwarding of traffic based on “classes” which are derived from fields in the ingress packet headers and policies provisioned on the router.