Spanning-tree forward-time – Allied Telesis AT-DC2552XS User Manual
Page 364
Chapter 14: STP Commands
364
SPANNING-TREE FORWARD-TIME
Syntax
spanning-tree forward-time
forwardtime
Parameter
forwardtime
Specifies the forward time in seconds. The range is 4 to 30
seconds. The default is 15 seconds.
Mode
Global Configuration mode
Description
Use this command to change the forward time value on the switch. The
forward time decides how long the ports remain in the listening and
learning states before they transition to the forwarding state.
The forwarding time is active only if the switch is in a role of the root bridge
in the spanning tree domain. The other switches in the domain 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)
When MSTP is enabled, this command sets the value to the CIST
(instance 0).
To restore the default 15 seconds, use the NO SPANNING-TREE
FORWARD-TIME command.
Confirmation Command
“SHOW SPANNING-TREE” on page 344
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