TRENDnet TL2-F7120 User Manual page 352

TRENDnet User's Guide
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The values configured for the spanning tree timers should satisfy the
following conditions:
2 * (forward-time - 1) >= max-age, and
max-age >= 2 * (hello-time +1)
The STP timers can be configured in the switch, only if the spanning tree
functionality is not shutdown in the switch. The type of spanning tree Mode
should be set, if the functionality is already shutdown.
This spanning tree timer's configuration is not supported in
PVRST Mode.
Syntax spanning-tree {forward-time <seconds(4-30)> | hello-time <seconds(1- 2)> |
max-age <seconds(6-40)>}
no spanning-tree { forward-time | hello-time | max-age }
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