The Priority value determined for the received frame.
This value is equivalent to the priority indicated in
the tagged frame received, or one of the evaluated
priorities, determined according to the media-type.
For untagged frames received from Ethernet media, this
value is equal to the dot1dPortDefaultUserPriority value
for the ingress port.
For untagged frames received from non-Ethernet media,
this value is equal to the dot1dRegenUserPriority value
for the ingress port and media-specific user priority.