This tracks inbound frames marked with Cascade's 'optionally discard eligible' tier, an intermediate discard-priority class between standard committed traffic and strict DE frames, since the last reset. Comparing this counter against cktInFrames and cktInDEFrames lets the admin build a full picture of the traffic mix by discard priority for capacity-planning discussions with the customer. For example, a circuit showing a large cktInODEFrames count alongside near-zero cktInDEFrames suggests the customer's equipment is using the ODE tier rather than strict DE marking for its lower-priority traffic.