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XG2000 series User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2009
5.11.5 spanning-tree max-age
Function
The maximum age (max-age) of the Spanning Tree is the maximum valid time interval between received BPDUs. When
BPDUs are not received within that time, the topology of the Spanning Tree will be recalculated, and the switch that timed out
will send BPDUs acting as a root switch.
Use the no form to return to the default setup.
Prompt
xg(config)#
Command syntax
spanning-tree max-age <6-40>
no spanning-tree max-age
Parameter
z max-age <6-40>
Sets the timeout value for the received BPDUs. When the switch does not receive BPDUs within
this period, the topology of the Spanning Tree will be recalculated. Values can be set in
the range of 6 to 40 seconds.
Command type
Configuration command
Default
20 seconds
Message
% Can't set max-age.
Explanation
An unsettable value was specified. The settable range of max-age differs depending on
the values of "hello-time" and "forward-time".
Solution
Set a value, which satisfies the conditions as detailed in this Section's Notes.
Note
z The settable range of maximum age differs depending on the value set with the "spanning tree hello-time" command
and the "spanning tree forward-time" command. The value must also satisfy the following conditions:
2¯ (forward_time -1) ≥ max_age
max_age ≥ 2 ¯ (hello_time + 1)
Example
Specify the maximum age (max-age) value of the Spanning Tree to 30 seconds.
xg(config)# spanning-tree max-age 30