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