Allied Telesis AT-S39 - Manual (Page 100)

Chapter 11: Spanning Tree Protocol Commands
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For example, if you use the default 20, all bridges
delete current configuration messages after 20
seconds. The range is 6 to 40 seconds. The default is 20
seconds.
Note
The value for the maxage parameter must be greater than
(2 x (hellotime +1)) and less than (2 x (forwarddelay -1)).
Description
This command sets the following STP bridge parameters
❑ Bridge priority
❑ Hello time
❑ Forwarding delay
❑ Maximum age time
Examples
The following command sets the hello time to 7 seconds and the
forwarding delay to 25 seconds:
set stp hellotime=7 forwarddelay=25
The following command returns all STP settings on the switch to the
default values:
set stp default