This counter records the number of ATM cells sent out from the port marked with CLP (Cell Loss Priority) bit set to 0, meaning high-priority traffic that should not be dropped even under congestion. Network engineers care about this because CLP=0 represents critical traffic—like voice calls or time-sensitive data—that must arrive reliably, and a low count might indicate that you're not properly prioritizing traffic. For example, if this counter shows only 100 cells out of 1 million total cells transmitted, it means only 0.01% of your traffic has guaranteed delivery, suggesting you may need to adjust QoS policies to prioritize more traffic.