User's Guide 24-Port Fast/Gigabit Ethernet Smart Switch ES-5224R+, ES-5224RF+, ES-5224RE+, ES-3124RE+

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5.2.5 Priority Configuration
In this menu, you can choose to set the priority queues of
each port. Select the Port Static Priority option and you will see
the following menu.
You can set the priority as High or Low for each port.
When packets are buffered in this switch, the ports with high
priority will have precedence over the ports with low priority.