Huawei Quidway S6500 Series Command Manual

Command Manual - STP
Quidway S6500 Series Ethernet Switches Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-33
Example
# Enable TC-BPDU protection on the switch.
[Quidway] stp tc-protection enable
1.1.36 stp timer forward-delay
Syntax
stp timer forward-delay centi-senconds
undo stp timer forward-delay
View
System view
Parameter
centi-senconds: Specifies Forward Delay, ranging from 400 to 3000 and measured in
centiseconds. By default, the Forward Delay of the switch is 1500 centiseconds.
Description
Using stp timer forward-delay command, you can configure Forward Delay for the
switch. Using undo stp timer forward-delay command, you can restore the default
Forward Delay .
To avoid temporary loop, MSTP defines a medium state, Learning, when the port
switches from the Discarding state to Forwarding state. There is also a delay before
state switchover to guarantee the synchronous switchover with the remote switch. The
Forward Delay configured on the root bridge determines the state transition time.
The root bridge will determine the state transition time according to the configured
values, while the other switches will apply the forward delay configured on it.
When configuring Hello time, Forward Delay and Max Age, please guarantee the
following equations:
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 hello, stp timer max-age, stp
bridge-diameter.

Huawei Quidway S6500 Series Specifications

General

Brand	Huawei
Model	Quidway S6500 Series
Category	Network Router
Language	English