Spanning-Tree Hello-Time - Fujitsu XG1200 User Manual

XG1200 User's Guide

5.9.5 spanning-tree hello-time

Function
The hello time is a time interval to send BPDUs. The switch informs all the other switches of root switch information by
periodically sending BPDUs.
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
hello-time <2-10>
Set hello time in units of secondes.
Command type
Configuration command
Default
2 seconds
Message
% Can't set hello-time
Explanation
An unsettable value has been specified. The settable range of "hello-time" differs depending on the values of
"forward-line" and "max-age".
Solution
Set a value, which satisfies the conditions in Notes, for "hello-time".
Note
If hello time is short, topology changes can be detected more quickly, but STP traffic and load for STP processing of
the switch will increase.
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, and also must satisfy the following conditions:
2
max_age ≥ 2
Example
Set hello time of Spanning Tree to 3 seconds.
xg(config)# spanning-tree hello-time 3
(forward_time - 1) ≥ max_age
(hello_time + 1)
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