Huawei AR530 Series - Optional) Configuring a Priority for a Switching Device in an MSTI

The system view is displayed.
2. Run:
stp [ instance instance-id ] root secondary
The device is configured as the secondary root bridge.
By default, a switching device does not function as the secondary root bridge. After
the configuration is complete, the BID of the device is 4096 and cannot be changed.
If instance is not specified, the device in MSTI 0 is a backup root bridge.
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7.6.1.4 (Optional) Configuring a Priority for a Switching Device in an MSTI
Context
In an MSTI, there is only one root bridge, which is the logic center of the MSTI. During root
bridge selection, a high-performance switching device at a high network layer should be selected
as the root bridge; however, the priority of such a device may not be the highest on the network.
It is therefore necessary to set a high priority for the switching device to ensure that the device
functions as a root bridge.
Low-performance devices at lower network layers are not fit to serve as a root bridge. Therefore,
set low priorities for these devices.
A switching device with a high priority is more likely to be selected as the root bridge in an
MSTI. A smaller priority value indicates a higher priority.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp [ instance instance-id ] priority priority
A priority is set for the switching device in an MSTI.
The default priority value of the switching device is 32768.
If the instance-id is not designated, a priority is set for the switching device in MSTI0.
NOTE
If the stp [ instance instance-id ] root primary or stp [ instance instance-id ] root secondary command
has been executed to configure the device as the root bridge or secondary root bridge, to change the device
priority, run the undo stp [ instance instance-id ] root command to disable the root bridge or secondary
root bridge function and run the stp [ instance instance-id ] priority priority command to set a priority.
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Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Ethernet Switching
7 MSTP Configuration
Issue 01 (2014-11-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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