Stp Timer Max-Age - Huawei Quidway S8500 Series Command Manual

Command Manual – STP
Quidway S8500 Series Routing Switches
root bridge transmits BPDU packets at an interval as you configured, while other
switches apply the Hello Time configured on the root bridge.
When configuring Hello time, Forward Delay and Max Age, remember to guarantee the
following equations:
2 x (Forward Delay -1.0 second) >= Max Age
Max Age >= 2 x (Hello Time + 1.0 second)
Only if the earlier-mentioned formulas are equal can the MSTP normally operate on the
entire network. Otherwise, the network may flap frequently. You are recommended to
use the stp bridge-diameter command to specify the diameter of the switching
network, so that MSTP can automatically calculate and give the moderate values for
the time parameters.
Related
bridge-diameter.
Example
# Set Hello Time of the switch to 400 centiseconds.
<Quidway>system-view
System View: return to User View with Ctrl+Z
[Quidway] stp timer hello 400

1.1.40 stp timer max-age

Syntax
stp timer max-age centi-senconds
undo stp timer max-age
View
System view
Parameter
centi-seconds: Specifies the Max Age, which is in the range from 600 to 4000 and
measured with centiseconds. By default, the Max Age of the switch is 2000
centiseconds.
Description
Use the stp timer max-age command to configure the Max Age of the switch.
Use the undo stp timer max-age command to restore the default Max Age.
MSTP can detect the link fault and automatically resume the forwarding state of the
redundant link. On the CIST, the switch checks if the configuration BPDU received via
command: stp timer
Huawei Technologies Proprietary
Chapter 1 MSTP Configuration Commands
forward-delay, stp
1-41
timer max-age, stp