This octet string defines a mapping between a field within a packet
payload and a 2-bit internal queue number. The octet string is a
list of queue numbers. Each octet contains a single 2-bit queue
number. In this product, 6-bits are wasted in each octet. In the
future we may support more queues per service in which case we will
extend the bit field in each octet.
When this map is used for 802.1p and MPLS, it must be exactly 8-octets
in length. For IP TOS, it must be 64-octets in length.