Huawei Quidway S8500 Series User Manual

Command Manual – STP
Quidway S8500 Series Routing Switches Chapter 1
MSTP Configuration Commands
Huawei Technologies Proprietary
1-40
Max Age >= 2 x (Hello Time + 1.0 second)
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 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.
 Note:
Hello time, Forward Delay and Max Age affect each other. Modifying any of them will
affect the value of other two parameters.
Related command: stp timer hello, stp timer max-age, stp bridge-diameter.
Example
# Set the Forward Delay of the device to 2000 centiseconds.
<Quidway>system-view
System View: return to User View with Ctrl+Z.
[Quidway] stp timer forward-delay 2000
1.1.39 stp timer hello
Syntax
stp timer hello centi-senconds
undo stp timer hello
View
System view
Parameter
centi-senconds: Specifies Hello Time value with an integer in the range of 100 to 1000
in units of centiseconds. By default, the Hello Time of the switch is 200 centiseconds.
Description
Use the stp timer hello command to configure Hello Time of the switch.
Use the undo stp timer hello command to restore the default Hello Time.
The STP defines to transmit configuration BPDU regularly at an interval specified with
Hello Time to keep the spanning tree stable. If the switch receives no BPDU packets
for a period of time, it will recalculate the spanning tree upon the BPDU timeouts. The

Huawei Quidway S8500 Series Specifications

General

Brand	Huawei
Model	Quidway S8500 Series
Category	Switch
Language	English