Bridge Priority Configuration - Huawei Quidway S3900 Series Operation Manual

Operation Manual – MSTP
Quidway S3900 Series Ethernet Switches-Release 1510
Note:
You can configure a switch as the root bridges of multiple spanning tree instances.
But you cannot configure two or more root bridges for one spanning tree instance.
So, do not configure root bridges for the same spanning tree instance on two or
more switches using the stp root primary command.
You can configure multiple secondary root bridges for one spanning tree instance.
That is, you can configure secondary root bridges for the same spanning tree
instance on two or more switches using the stp root secondary command.
You can also configure the current switch as the root bridge by setting the priority of
the switch to 0. Note that once a switch is configured as the root bridge or a
secondary root bridge, its priority cannot be modified.
III. Configuration example
# Configure the current switch as the root bridge of spanning tree instance 1 and a
secondary root bridge of spanning tree instance 2.
<Quidway> system-view
[Quidway] stp instance 1 root primary
[Quidway] stp instance 2 root secondary

1.2.4 Bridge Priority Configuration

Root bridges are selected by the bridge priorities of switches. You can make a specific
switch being selected as a root bridge by set a higher bridge priority for the switch (Note
that a smaller bridge priority value indicates a higher bridge priority.) A MSTP-enabled
switch can have different bridge priorities in different spanning tree instances.
I. Configuration procedure
Table 1-6 Assign a bridge priority to a switch
Operation
Enter system view
Set a bridge priority for
the current switch
Command
system-view
stp [ instance instance-id ]
priority priority
Huawei Technologies Proprietary
1-12
Chapter 1 MSTP Configuration
Description
—
Required
The default bridge priority of
a switch is 32,768.