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stp_in() propagated the TC flag of any BPDU that did not arrive on an alternate port, and acknowledged and propagated a TCN from any port, so a port still in its listen period or held discarding in a dispute could flush the addresses of every other port and move the topology change counter. 802.1D-2004 17.31 keeps the Topology Change machine in LEARNING until the port forwards and drops rcvdTc and rcvdTcn there. Both paths now ask for the forwarding state first; an alternate port is discarding, so the old check is covered by the new one. Scenario 53 plays a TC flag and a TCN into a port that is still discarding, and then into the same port once it forwards. Scenario 51 used a TCN on a port one tick short of its edge transition as the trigger for the clock it tests; it now waits for the transition.