This Counter64 counts frames that arrived within this circuit's Excess Burst allowance (above CIR but still within Be) and were therefore tagged with the DE bit rather than dropped, representing traffic admitted onto the circuit but marked as expendable if downstream congestion occurs. This is the counter that shows how often this circuit's traffic exceeds its guaranteed rate but not so much it gets discarded outright, giving an admin an early warning sign before circuitInFramesDiscard starts climbing. For example, a circuit whose circuitInFramesTagged count is high but circuitInFramesDiscard stays near zero indicates traffic frequently bursts above CIR but the Be allowance is generous enough to absorb it without loss.