C613-50631-01 Rev A Command Reference for IE340 Series 741
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
SPANNING TREE COMMANDS
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 notes 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.
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