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XG2000 series User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2009
5.11.4 spanning-tree hello-time
Function
The hello time is a time interval between BPDUs. Periodic BPDUs inform all the other switches on the network of the root
switch routing information.
Use the no form to return to the default setup.
Prompt
xg(config)#
Command syntax
spanning-tree hello-time <2-10>
no spanning-tree hello-time
Parameter
z hello-time <2-10>
Specify a hello time in seconds.
Command type
Configuration command
Default
2 seconds
Message
% Can't set hello-time
Explanation
An unsettable value was specified. The settable range of "hello-time" differs depending
on the values of "forward-time" and "max-age".
Solution
Set a value which satisfies the conditions specified in this Section's Notes.
Note
z If the hello time is short, topology changes can be detected more quickly, but STP traffic and STP processing overhead
will increase.
z The settable range of hello-time differs depending on the values set with the "spanning-tree max-age" 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
Set the hello time value of the Spanning Tree switch to 3 seconds.
xg(config)# spanning-tree hello-time 3