Multi-stage DSCP marking and class ID in traffic shapers

Traffic shapers have a multi-stage method so that packets are marked with a different differentiated services code point (DSCP) and class id at different traffic speeds. Marking packets with a different DSCP code is for the next hop to classify the packets. The FortiGate benefits by marking packets with a different class id. Combined with the egress interface shaping profile, the FortiGate can handle the traffic differently according to its class id.


DSCP code

Class ID

speed < guarantee bandwidth


class id in shaping policy

guarantee bandwidth < speed < exceed bandwidth



exceed bandwidth < speed