This object is used to specify a level of
traffic were the instances of the
cirbhBackHaulRcvdUtilState and cirbhBackHaulSentUtilState
objects are marked as 'warning'. All changes to this
threshold will take effect at the end of the current
interval. The value for this object must be greater than
the value specified for the cirbhBackHaulAcceptableThreshold
object. Also, the value for this object must be less than or
equal to value of the cirbhBackHaulOverloadedThreshold
object.