Command Manual – STP
Quidway S8500 Series Routing Switches
Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-42
the port expires according to the Max Age. If the BPDU expires, the MSTI 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
, 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 command:
stp timer forward-delay
,
stp timer hello
,
stp bridge-diameter
.
Example
# Set Max Age of the device to 1000 centiseconds.
<Quidway>system-view
System View: return to User View with Ctrl+Z.
[Quidway] stp timer max-age 1000
1.1.41 stp timer-factor
Syntax
stp timer-factor number
undo stp timer-factor
View
System view
Parameter
number
: Specifies the multiple of hello time, in the range of 1 to 10. The default value is
3.
Description
Use the
stp timer-factor
command to configure the multiple of hello time for the switch.
Use the
undo stp timer-factor
command to restore the default multiple value.
The Ethernet switch transmits STP packets every hello time. Generally, if the switch
does not receive the STP packets from the upstream switch for three times of hello time,
