This object specifies the clear low threshold in percentage
of available public ports that are used up. The notification
cNatCgnNotifPortUsageWatermarkLowClear is sent once the value
of cNatCgnCounterAveragePortAllocation becomes more than or
equal to this value. If this object is set to zero, the
notification is not generated.
Implementations must ensure that values of objects
cNatCgnCounterPortUsageClearLowThreshold and
cNatCgnCounterPortUsageLowThreshold remain consistent. For
example, an implementation must respond with an
inconsistentValue error if an attempt is made to set the the
value of cNatCgnCounterPortUsageClearLowThreshold to be less
than or equal to that of cNatCgnCounterPortUsageLowThreshold
and vice versa.