Cabletron Systems STS16-20D, STS16-20R - page 117

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Switch Configuration SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
Switch Hello Time (in Seconds)
The time this CRF spanning tree instance waits before sending the next Hello
BPDU message when this entity is the root in STP. The default is 2.
The minimum value is 1. The maximum value is the lower of 10 or ((Switch
Maximum Message Age / 2) – 1).
Switch Maximum Message Age (in Seconds)
Maximum message age used when this CRF instance is the root in a spanning tree
domain. This parameter sets the time at which the configuration message used by
the spanning tree algorithm should be discarded. The default is 20. The minimum
value is the higher of 6 or ((Switch Hello Time x 2) + 1).
The maximum cannot be more than the lower of 40 or ((Switch Forward Delay x
2) – 1).
The range limits that appear when you select this parameter are calculated using the
values currently selected for Switch Hello Time and Switch Forward Delay.
Switch Forward Delay (in Seconds)
The time the SmartStack STS16-20D/STS16-20R waits between transitions from
listening to learning and from learning to forwarding. The default is 15. The
minimum is the larger of 4 or ((Switch Maximum Message Age / 2) + 1). The
maximum is 30.
The lower range limit that appears when you select this parameter reflects the value
currently selected for Switch Maximum Age.
Port Spanning Tree Parameters...
Selecting this item brings up the Port Spanning Tree Parameters screen.