Globally-configured traffic marking

If a packet matches one of the globally-configured packet classifiers, QoS applies one of the following types of traffic marking to the outbound packet:
Layer 2 802.1p prioritization

Controls the outbound port-queue priority for traffic leaving the switch, and (if traffic exits through a VLAN-tagged port) sends the priority setting with the individual packets to downstream devices.

Layer 3 DSCP marking

Enables the switch to set, change, and honor prioritization policies by using the Differentiated Services (diff-serv) bits in the IPv4 ToS byte and IPv6 Traffic Class byte of packet headers.