Siemens SCALANCE XM-400 - Page 255

Network structures
6.3 Spanning Tree
SCALANCE XM-400/XR-500 Command Line Interface (CLI)
Configuration Manual, 06/2016, C79000-G8976-C252-11
255
Requirement
You are in the Global configuration mode.
The command prompt is as follows:
cli(config)#
Syntax
Call up the command with the following parameters:
spanning-tree{forward-time<seconds(4-30)>|hello-time<seconds(1-2)>|
max-age<seconds(6-40)>}
The parameters have the following meaning:
Parameter
Description
Range of values / note
forward-time
Keyword for the time after which a port
changes its spanning tree status from
"Blocking" to "Forwarding"
-
seconds
Time after which the changeover takes
place
4 ... 30
Default: 15
hello-time
Keyword for the time after which the
bridge sends its configuration BPDUs
-
seconds
Time after which they are sent 1 ... 2
Default: 2
max-age
Keyword for the time after which the
information of the BPDUs becomes
invalid
-
seconds
Maximum age of the BPDUs in sec-
onds
6 ... 40
Default: 20
Note
Dependencies when setting the timing
If you specify the time settings for spanning tree, you need to keep to the following two rules:
•
2 * (forward-time - 1) ≥ max-age
•
max-age
≥ 2 * (
hello-time
+ 1)
Result
The selected setting for the time is configured.