Specifications

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3.5.3.2 VLAN Tag Priority
When you click VLAN Tag Priority, it will show the following:
VLAN Tag Priority uses the tag field information which has been inserted into an Ethernet
frame. If a port has an 802.1Q-compliant device attached (such as this modem), these tagged
frames can carry VLAN membership information.
IEEE 802.1Q Tagged Frame for Ethernet:
User priority is giving eight ( 2
3
= 8 ) priority levels. The default value is 0, indicating normal
treatment.