Description: This attribute is a vector which indicates the size and three discard thresholds for transmit frame memory for this FP. The transmit frame memory is used for storing frames to be transmitted by this FP.

The first value indicates the transmit frame memory size. This is derived based on the total transmit memory capacity of this FP, and the number of connections specified.

The current value of txFrameMemoryUsage together with the vector of values in txFrameMemoryThresholds determines the txFrameMemoryCongestionState. The congestion state determines whether frames of a given discard priority (DP) are discarded or queued for transmit.

When the txFrameMemoryUsage attribute is between threshold 0 and threshold 1, the txFrameMemoryCongestionState indicates the value 0. In congestion state 0, traffic with DP > 0 is discarded. Threshold 1 is set approximately at 90 percent of threshold 0, the total transmit frame memory size.

When the txFrameMemoryUsage attribute is between threshold 1 and threshold 2, the txFrameMemoryCongestionState indicates the value 1. In congestion state 1, traffic with DP > 1 is discarded. Threshold 2 is set approximately at 85 percent of threshold 0, the total transmit frame memory size.

When the txFrameMemoryUsage attribute is between threshold 2 and threshold 3, the txFrameMemoryCongestionState indicates the value 2. In congestion state 2, traffic with DP > 2 is discarded. Threshold 3 is set approximately at 75 percent of threshold 0, the total transmit frame memory size.

When the txFrameMemoryUsage attribute is below threshold 3, the txFrameMemoryCongestionState indicates the value 3. In congestion state 3, traffic with DP=3 is queued.