Compaq SW3324 - Manual (Page 108)

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Properly configured, this mechanism assures that during congestion, normal
priority traffic does not delay the highest priority data. The tagged header in the
frame governs individual frame priority. Figure D-1 shows priority queuing
operating within a switch. Packets coming in through ports 1 and 4 are tagged
as normal traffic and placed in a normal queue on an outbound port. Packets
coming in through ports 2 and 5 are tagged as high priority traffic and placed in
a high priority queue on an outbound port. You can configure priority queuing
using the Class of Service Configuration Menu in the console interface or
via SNMP.
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