Contains the priority statistics. The collections are based
on the value of the 3-bit user priority field encoded in the
Tag Control Information (TCI) field according to [19], [20].
Note that this table merely reports priority as encoded in
the VLAN headers, not the priority (if any) given to the
frame for the actual switching purposes.
No garbage collection is designed for this table, as there
always are at most eight rows per statistical set, and the
low memory requirements do not justify the implementation of
such a mechanism.