American Fibertek Commander C10e-PoE/C10p-PoE - Manual (Page 89)

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Another warning dialog box will then appear. It is
possible to apply settings that will make the
Commander host CPU unreachable. Check your
settings carefully before attempting to save the
settings. Click OK to save.
STP / RSTP Parameters
Aging
The aging time is the number of seconds a MAC address will be kept in the forwarding database
after having received a packet from this MAC address. The entries in the forwarding database are
periodically timed out to ensure they won't stay around forever. Normally there should be no need
to modify this parameter, but it can be changed with (time is in seconds).
Priority
Each bridge has a relative priority and cost. Each interface is associated with a port (number) in
the STP. Each has a priority and a cost that is used to decide which is the shortest path to forward
a packet. The lowest cost path is always used unless the other path is down.
If you have multiple bridges and interfaces then you may need to adjust the priorities to achieve
optimum performance
Forwarding delay
Forwarding delay time is the time spent in each of the Listening and Learning states before the
Forwarding state is entered. This delay is so that when a new bridge comes onto a busy network it
looks at some traffic before participating.
Hello time
Periodically, a hello packet is sent out by the Root Bridge and the Designated Bridges.
Hello packets are used to communicate information about the topology throughout the entire
Bridged Local Area Network.
Max age
If another bridge in the spanning tree does not send out a hello packet for a long period of time, it
is assumed to be dead.
Path priority and cost
Each interface in a bridge could have a different speed and this value is used when deciding
which link to use. Faster interfaces should have lower costs.