SMC Networks TIGERSWITCH SMC6752AL2 ユーザーズマニュアル

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spanning-tree forward-time
This command configures the spanning tree bridge forward time globally 
for this switch. Use the no form to restore the default.
Syntax 
spanning-tree forward-time seconds
no spanning-tree forward-time
seconds - Time in seconds. (Range: 4 - 30 seconds)
The minimum value is the higher of 4 or [(max-age / 2) +1].
Default Setting 
15 seconds
Command Mode 
Global Configuration
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 the discarding state; otherwise, temporary data loops 
might result.
Example 
spanning-tree hello-time
This command configures 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]. 
Console(config)#spanning-tree forward-time 20
Console(config)#