This attribute indicates the congestion state of the receive frame
memory for this FP.
This attribute indicates which rxFrameMemoryThresholds
corresponds to the current value of rxFrameMemoryUsage. The
congestion state is used to determine if frames of a particular
discard priority (DP) are discarded before being queued for
processing on this FP.
The congestion state of receive frame memory is indicated by a
numeric value ranging from 3 to 0. When receive frame memory is
in congestion state 'x', traffic with DP > 'x' is discarded before
processing. Traffic with DP < 'x' may be queued for processing,
depending on the congestion level of the processor or bus queue.
Traffic with DP = 'x' may be either queued or discarded depending
on how close the value of rxFrameMemoryUsage is to the next
threshold as displayed in rxFrameMemoryThresholds. For example,
DP=3 traffic is queued until the value indicated by
rxFrameMemoryUsage equals the value indicated in
rxFrameMemoryThresholds 3. At that point, DP=3 traffic is
discarded.