Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 35)

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4.4.7.2 Configure 802.1 Priority
The IEEE 802.1p extension of IEEE 802.1Q prioritises traffic at the data-link/MAC layer
through a 3-bit header field which was never articulated in the original VLAN standard.
IEEE only suggests 802.1p definitions; it does not mandate them.
The upper panel of Figure 30 shows an 8-port switch example in which 802.1p priority
can be applied individually to ports. (For 16- and 24-port models, the screen would
function the same but with more ports shown.) The lower panel shows that the switch
provides 4 priority queues to which the 8 tags can be mapped in various schemes.
Figure 30 — Configure 802.1p Priority