AT-9000 Switch Command Line User’s Guide
Section VI: Spanning Tree Protocols 499
SPANNING-TREE FORWARD-TIME
Syntax
spanning-tree forward-time
forwardtime
Parameters
forwardtime Specifies the forward time. The range is 4 to 30
seconds. The default is 15 seconds.
Mode
Global Configuration mode
Description
Use this command to set the forward time parameter on the switch. This
parameter specifies how long the ports remain in the listening and learning
states before they transition to the forwarding state.
This parameter is active only if the switch is acting as the root bridge of the
spanning tree domain. Switches that are not acting as the root bridge use
a dynamic value supplied by the root bridge.
The forward time, max-age and hello time parameters should be set
according to the following formulas, as specified in IEEE Standard 802.1d:
max-age <= 2 x (forward time - 1.0 second)
max-age >= 2 x (hello time + 1.0 second)
Confirmation Command
“SHOW SPANNING-TREE” on page 498
Example
This example set the forward time on the switch to 25 seconds:
awplus> enable
awplus# configure terminal
awplus(config)# spanning-tree forward-time 25
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