Spanning-Tree Forward-Time - Allied Telesis SwitchBlade x908 Series Software Reference Manual

spanning-tree forward-time

Use this command to set the forward delay.
The forward delay sets the time (in seconds) to control how fast a port changes its spanning
tree state when moving towards the forwarding state. If the mode is set to STP, the value
determines how long the port stays in each of the listening and learning states which precede
the forwarding state. If the mode is set to RSTP or MSTP, this value determines the maximum
time taken to transition from discarding to learning and from learning to forwarding.
This value is used only when the switch is acting as the root bridge. Switches not acting as the
Root Bridge use a dynamic value for the forward delay set by the root bridge. The forward
delay, max-age, and hello time parameters are interrelated.
Syntax
spanning-tree forward-time <forward-delay>
no spanning-tree forward-time
Parameter
<forward-delay
Global Configuration mode
Mode
The default value is 15 seconds.
Default
The allowable range for forward-time is 4-30 seconds.
Usage
The forward delay, max-age, and hello time parameters should be set according to the
following formulae, as specified in IEEE Standard 802.1d:
2 x (forward delay - 1.0 seconds) >= max-age
max-age >= 2 x (hello time + 1.0 seconds)
Example
awplus(config)#
show spanning-tree
Related Commands
spanning-tree forward-time <forward-delay>
spanning-tree hello-time <hello-time>
spanning-tree mode
C613-50007-01 REV B
Description
<4-30> the forwarding time delay in seconds.
awplus# configure terminal
spanning-tree forward-time 6
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Spanning Tree Commands
19.29