This attribute counts the number of internal trunk protocol packets
(including those on the interrupting queue) received from the
remote module that have been discarded. This counter wraps around
to zero when the maximum value is exceeded. The three main
reasons that cause this counter to increase are:
(1) the two Trunks are not synchronized,
(2) the remote trunk protocol is not the same version as the local
protocol, and
(3) the remote trunk has restaged.