Enterasys Vertical Horizon VH-2402S2 Configuration Manual page 110

Figure C-1 shows priority queuing operating within a switch. Frames
entering the switch through ports 1 and 4 are tagged as normal traffic and
placed in a normal priority queue on the outbound port. Frames entering
through ports 2 and 5 are tagged as high priority traffic and placed in a
high priority queue on the outbound port. Priority queuing can be
configured using the console interface or via SNMP.
Figure C-1. Class of Service Example
102 Class of Service VH-2402S2