The number of the queue within the queue set.
In FIFO queuing, this value is always 2.
In Priority Queuing, it corresponds to the various priorities:
high = 0
medium = 1
normal = 2
low = 3
In Custom Queuing, it is the queue number referenced in the
access list.
In Weighted Fair Queuing, it is the queue number associated
with the traffic stream (conversation) identified.