Allied Telesis AT-DC2552XS - Manual (Page 368)

Chapter 14: STP Commands
368 Section II: Layer 2 Switching
SPANNING-TREE MAX-AGE
Syntax
spanning-tree max-age maxage
Parameter
maxage
Specifies the maximum aging value. The range is 6 to 40 seconds.
The default is 20 seconds.
Mode
Global Configuration mode
Description
Use this command to set the maximum age value. The maximum age
determines how long the switch saves configuration BPDU information
before it is deleted.
The max-age is active only if the switch is in a role of the root bridge of 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 value of 20 seconds, use the NO SPANNING-TREE
MAX-AGE command.
Confirmation Command
“SHOW SPANNING-TREE” on page 344
Example
This example sets the maximum age parameter to 35 seconds:
awplus> enable
awplus# configure terminal
awplus(config)# spanning-tree max-age 35