Command Reference Guide

3Com Router 5000 Family and Router 6000 Family bridge stp max-age ● 25
Command Reference
bridge stp max-age
Purpose Use the bridge stp max-age command to set the Max Age timer on the bridge.
Use the undo bridge stp max-age command to restore the default.
Syntax bridge stp max-age seconds
undo bridge stp max-age
Parameters seconds
Value for the Max Age timer on the bridge. Valid
values are 6 to 40 seconds.
If no value is specified, the default is 20 seconds.
Example Set the Max Age timer on the bridge to 30 seconds.
[Router] bridge stp max-age 30
View This command can be used in the following views:
■ System view
Description A Max Age timer is used to limit the lifetime of BPDUs. Enabling STP on a port starts a
Max Age timer. If the interface receives no BPDU before the timer expires, its link is
considered faulty and STP starts to recalculate its topology.
When configuring a Max Age timer, consider the following:
■ On a spanning tree, all bridges use the Max Age timer of the root instead of their
own.
■ Set the timer appropriately. A small timer may result in undesired spanning tree
calculation frequency and have the bridge mistake congestions for link failures. A
large timer, on the contrary, may decrease the self-tuning capability of the network
preventing the bridge from discovering link failures quickly.
You are recommended to use the default Max Age timer setting in normal cases.