Cabletron Systems SmartSTACK ELS100 Installation And User Manual page 104

Figure E-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 Class of Service Configuration Menu in the console
interface or via SNMP.
Figure E-1. Class of Service Example
90 Class Of Service ELS100-24TX