Allied Telesis AT-8100 Series - Manual (Page 842)

Chapter 57: RSTP Commands
842
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 to control how fast
the ports change their spanning tree states when moving towards the
forwarding state. For RSTP, this parameter specifies the maximum time
taken by the ports to transition from the discarding state to the learning
state and from the learning state to the forwarding state.
This parameter is active only if the switch is acting as the root bridge.
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)
Use the no version of this command, NO SPANNING-TREE FORWARD-
TIME, to set the command to its default value of 15 seconds.
Confirmation Command
“SHOW SPANNING-TREE” on page 838
Example
This example sets the forward time for the switch to 5 seconds:
awplus> enable
awplus# configure terminal
awplus(config)# spanning-tree forward-time 5