This counter tallies the high-priority cells (CLP=0) transmitted from the Virtual Channel Link that are guaranteed not to be dropped by the network. Network engineers review this to ensure that critical traffic is being sent with the correct priority marking and to validate that QoS policies on the egress port are correctly classifying and tagging traffic. A count showing that only 5% of transmitted cells are CLP=0 while SLA agreements require 30% guaranteed delivery suggests the port is under-prioritizing traffic relative to customer contracts.