An indication of whether this traffic class is
'unsatisfied'. The value of this object is 'true(1)' if it is
underLimit and has a persistent backlog, meaning it has
packets waiting in its queue. The value is 'false(1)'
otherwise. Note that a class can be considered satisfied if it
is underLimit and it just hasn't had anything to transmit.
The presence of an unsatisfied class indicates that some other
class is overLimit and 'hogging' bandwidth. Persistently
unsatisfied classes indicate that tuning some of the
parameters (such as xtmClassMaxIdle or xtmClassBounded) may be
necessary.