SMC Networks SMC6924VF manual Rules defining port status are

WEB-BASED MANAGEMENT

Parameter	Description
	The rules defining port status are:
	• A port on a network segment with no other STA
	compliant bridging device is always forwarding.
	• If two ports of a switch are connected to the same
	segment and there is no other STA device attached to
	this segment, the port with the smaller ID forwards
	packets and the other is blocked.
	• All ports are blocked when the switch is booted, then
	some of them change state to listening, to learning,
	and then to forwarding.
Forward	The number of times the port has changed status to
Transitions	forwarding state.
Designated Cost	The cost for a packet to travel from this port to the root
	in the current spanning tree configuration. The slower
	the media, the higher the cost.
Designated	The priority and MAC address of the device through
Bridge	which this port must communicate to reach the root of
	the spanning tree.
Designated Port	The priority and number of the port on the designated
	bridging device through which this switch must
	communicate with the root of the spanning tree.

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