Command Manual - STP
Quidway S6500 Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-35
[Quidway] stp timer hello 300
1.1.38 stp timer max-age
Syntax
stp timer max-age
centi-senconds
undo stp timer max-age
View
System view
Parameter
centiseconds
: Specifies the Max Age, ranging from 600 to 4000 and measured with
centiseconds. By default, the Max Age of the switch is 2000 centiseconds.
Description
Using
stp timer max-age
command, you can configure the Max Age of the switch.
Using
undo stp timer max-age
command, you can 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
the port expires according to the Max Age. If the BPDU expires, the STI has to be
calculated again.
Max Age takes no effect on MSTIs. If the current switch is CIST root bridge, it will check
if the configuration BPDU expires according to the configured Max Age. Otherwise, the
switch adopts the Max Age configured on the CIST root bridge.
When you configure Hello time, Forward Delay and Max Age, ensure the following
formulas equal:
2 * (Forward Delay -1.0 seconds) >= Max Age
Max Age >= 2 * (Hello Time + 1.0 seconds)
Only if the above-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 instance root primary
command to specify the diameter of the switching
network, so that MSTP can automatically calculate and give the moderate values for
the time parameters.
For the related command, see
stp timer forward-delay, stp timer hello, stp
bridge-diameter
.
Example
# Set Max Age of the device to 1000 centiseconds.
[Quidway] stp timer max-age 1000
