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It bases on 802.1p QoS and affects untagged packets. When the packets
enter the switch, it would get the priority precedence according to your
Default Priority setting and map to 802.1p priority setting in QoS function.
For example, while you set Default Priority of port 2 with 2 and transmit
untagged packets to port 2, these packets will own priority 2 precedence
due to your default 802.1p Priority Mapping setting in QoS function and
be put into Queue 1.
Drop Untag:
Drop untagged frame. You can configure a given port to accept all frames
(Tagged and Untagged) or just receive tagged frame. If the former is the
case, then the packets with tagged or untagged will be processed. If the
later is the case, only the packets carrying VLAN tag will be processed,
the rest packets will be discarded.