3.2.4.4 Perform a Test Result Query

When a higher-layer application or protocol directs this protocol to request a list of Probe frames seen by a given responder, the mapper MUST check the Network Topology Test Session List for the entry for the responder using the MAC address. If an entry does not exist, or if there is already an outstanding request for the responder (that is, the Pended Request field is not empty), then the mapper MUST ignore the request.

If an entry exists and there is no outstanding request, the mapper MUST send a Query frame to that responder using the sequence number in the Sequence Number field of the entry, store the frame as the Pended Request in the Network Topology Test Session List, and set the Per-Responder Response timer to expire in 350 milliseconds.

Query frames are intended to elicit a response from the responder, so they MUST contain a nonzero sequence number; otherwise, the frame will be ignored by the responder.