Spanning-tree forward-time – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 533
Spanning Tree Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A
AlliedWare Plus
TM
Operating System - Version 5.4.4C
19.43
spanning-tree forward-time
Use this command to set the forward delay value. Use the no variant of this command to
reset the forward delay value to the default setting of 15 seconds.
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
Default
The default is 15 seconds.
Mode
Global Configuration
Usage
The allowable range for forward-time is 4-30 seconds.
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
Related Commands
show spanning-tree
spanning-tree forward-time
Parameter
Description
<forward-delay
<4-30> The forwarding time delay in seconds.
awplus#
configure terminal
awplus(config)#
spanning-tree forward-time 6