3.4.2 Timers
The Cross-Traffic Analysis Initiator role has one timer per network interface —the Per-Interface Lease Renewal timer. This recurring timer broadcasts the QosCounterLease frame. This timer remains active for as long as any higher-layer application or protocol performs cross-traffic analysis. This timer SHOULD have a lower period than the lease period so responders can keep collecting their counter histories.
Each entry in the Snapshot Request Table has a Per-Snapshot Response timer. This one-shot timer ensures a timely response (or non-response) to a QosCounterSnapshot request.