C
HAPTER
 32
  |  Spanning Tree Commands
ā  798  ā
COMMAND USAGE 
This command sets the maximum time (in seconds) the root device will 
wait before changing states (i.e., discarding to learning to forwarding). This 
delay is required because every device must receive information about 
topology changes before it starts to forward frames. In addition, each port 
needs time to listen for conflicting information that would make it return to 
the discarding state; otherwise, temporary data loops might result.
EXAMPLE 
Console(config)#spanning-tree forward-time 20
Console(config)#
spanning-tree
hello-time
This command configures the spanning tree bridge hello time globally for 
this switch. Use the no form to restore the default.
SYNTAX 
spanning-tree hello-time time
no spanning-tree hello-time
time - Time in seconds. (Range: 1-10 seconds). 
The maximum value is the lower of 10 or [(max-age / 2) - 1]. 
DEFAULT SETTING 
2 seconds
COMMAND MODE 
Global Configuration
COMMAND USAGE 
This command sets the time interval (in seconds) at which the root device 
transmits a configuration message.
EXAMPLE 
Console(config)#spanning-tree hello-time 5
Console(config)#
RELATED COMMANDS
spanning-tree forward-time (797)
spanning-tree max-age (799)