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Command Reference for AT-IX5-28GPX High Availability, High Power Video Surveillance PoE Switch
C613-50057-01 REV A
AlliedWare Plus™ Operating System - Version 5.4.5-0.x
S
PANNING
T
REE
C
OMMANDS
SPANNING
-
TREE
FORWARD
-
TIME
spanning-tree forward-time
Overview
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 device is acting as the root bridge. Devices 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 formula, 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#
configure terminal
awplus(config)#
spanning-tree forward-time 6
Related
Commands
show spanning-tree
spanning-tree forward-time
spanning-tree hello-time
spanning-tree mode
Parameter
Description
<
forward-delay
>
<4-30> The forwarding time delay in seconds.