3.4.4.1 Start Cross-Traffic Analysis
When a higher-layer application or protocol requests cross-traffic analysis on a given interface, the Network Medium Connected Flag is checked first. If the network is currently disconnected, the request is rejected. Otherwise, the initiator MUST broadcast a QosCounterLease frame over that interface, and start the interface's periodic Lease Renewal timer. The timer SHOULD be set to expire every 3 minutes.
An initiator SHOULD support multiple higher-layer application or protocol requests simultaneously. In this case, it MUST do the initialization described above for the first request. It SHOULD NOT send a QosCounterLease frame for consecutive requests; it MUST NOT reinitialize the periodic Lease Renewal timer, but continue with the current timer period.
The Base header fields of the QosCounterLease frame MUST be set as follows.
The Real Source Address field MUST be set to the MAC address of the interface of the initiator.
The Real Destination Address field MUST be set to the broadcast address.
The Sequence Number field is ignored by the responder and MUST be set to zero.