This attribute specifies the importance of the packets of VNS. Zero
(0) is used the most important traffic, and three (3) is used for the
least important traffic. In times of congestion, the discardPriority is
used by packet forwarding on the VNS to determine which packets
are discarded first to reduce the load. Packets with a higher
discardPriority (or numerically less) are discarded after packets
with a lower discardPriority (or numerically higher).