Spanning-Tree Max-Age - Allied Telesis SwitchBlade x908 Series Software Reference Manual

spanning-tree max-age

Use this command to set the max-age.
This sets the maximum age, in seconds, that dynamic spanning tree configuration information is
stored in the switch before it is discarded.
Use this command for RSTP, STP or MSTP.
Use the no parameter with this command to restore the default value of max-age.
Syntax
spanning-tree max-age <max-age>
no spanning-tree max-age
Parameter
<max-age>
Global Configuration mode
Mode
The default value of spanning-tree max-age is 20 seconds.
Default
Max-age is the maximum time in seconds for which a message is considered valid.
Usage
Configure this value sufficiently high, so that a frame generated by the root bridge can be
propagated to the leaf nodes without exceeding the max-age.
The forward delay, max-age, and hello time parameters should be set according to the
following formulae, 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(config)#
show spanning-tree
Related Commands
spanning-tree forward-time <forward-delay>
spanning-tree hello-time <hello-time>
C613-50007-01 REV B
Description
<6-40> The maximum time, in seconds.
awplus# configure terminal
spanning-tree max-age 12
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Spanning Tree Commands
19.33