29.13  spanning-tree timer 
Description 
The  spanning-tree timer  command is used to configure forward-time, 
hello-time and max-age of  Spanning Tree. To return to the default 
configurations, please use no spanning-tree timer command. 
Syntax 
spanning-tree timer {[ forward-time
forward-time 
] [ hello-time
hello-time 
] 
[ max-age
max-age 
]}
 
no spanning-tree timer 
Parameter 
forward-time 
—— Forward Delay, which is the time for the port to transit its 
state after the network topology is changed. Forward Delay ranges from 4 to 
30 in seconds and it is 15 by default. Otherwise, 2 * (Forward Delay - 1) >= 
Max Age. 
hello-time
  ——Hello Time, which is the interval to send BPDU packets, and 
used to test the links. Hello Time ranges from 1 to 10 in seconds and it is 2 by 
default. Otherwise, 2 * (Hello Time + 1) <= Max Age. 
max-age
  ——  The maximum time the switch can wait without receiving a 
BPDU before attempting to reconfigure, ranging from 6 to 40 in seconds. By 
default, it is 20. 
Command Mode 
Global Configuration Mode 
Privilege Requirement 
Only Admin, Operator and Power User level users have access to these 
commands. 
Example 
Configure forward-time, hello-time and max-age for Spanning Tree as 16 
seconds, 3 seconds and 22 seconds respectively: 
T2500G-10TS(config)# spanning-tree timer forward-time 16 hello-time 3 
max-age 22 
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