This attribute shows the amount by which the bandwidth has been
reduced for this connection. This value is non-zero only for
connections which have bandwidthElastic displayed as yes, and
which are also operating in a reduced bandwidth mode. This is
typically the case for selected connections running over an IMA
link. This attribute takes a value from 0 (no reduction) up to the
ECR. For all connections which are running at their full allocated
bandwidth, bwReduction has the value 0. Connections which have
been reduced in allocated bandwidth have a positive number for this
attribute. The bwReduction may be subtracted from the ECR (which
is displayed as txTrafficDescParm 5) to determine the actual
bandwidth allocated to this connection.