SMC Networks SMC TigerStack III SMC6824MPE - Manual (Page 476)

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Command Usage
This command sets the maximum time (in seconds) the root device will
wait before changing states (i.e., discarding to learning to forwarding).
This delay is required because every device must receive information
about topology changes before it starts to forward frames. In addition,
each port needs time to listen for conflicting information that would
make it return to a blocking state; otherwise, temporary data loops might
result.
Example
spanning-tree hello-time
Use this command to configure the spanning tree bridge hello time globally
for this switch. Use the no form to restore the default.
Syntax
spanning-tree hello-time time
no spanning-tree hello-time
time - Time in seconds, (Range: 1 - 10 seconds).
The maximum value is the lower of 10 or [(max-age / 2) -1].
Default Setting
2 seconds
Command Mode
Global Configuration
Command Usage
This command sets the time interval (in seconds) at which the root device
transmits a configuration message.
Example
Console(config)#spanning-tree forward-time 20
Console(config)#
Console(config)#spanning-tree hello-time 5
Console(config)#