Installation manual

Command Manual - STP
Quidway S3000-EI Series Ethernet Switches Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-32
change errors. Due to the illegal change, the traffic supposed to travel over the
high-speed link may be pulled to the low-speed link and congestion will occur on the
network.
MSTP provides Root protection function to protect the root bridge: The port configured
with Root protection only plays a role of designated port on every instance. Whenever
such port receives a higher-priority BPDU, it will be set to listening state and not forward
packets any more (as if the link to the port is disconnected). If the port has not received
any higher-priority BPDU for a certain period of time thereafter, it will resume the normal
state.
For the related command, see stp interface root-protection.
Example
# Enable Root protection on the ethernet0/1 port of the switch.
[Quidway-Ethernet0/1] stp root-protection
1.1.35 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: