Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp priority priority
The priority of a switching device is configured.
The default priority value of a switching device is 32768.
NOTE
l To configure a switching device as a primary root bridge, you can run the stp root primary command
directly. The priority value of this switching device is 0.
l To configure a switching device as a secondary root bridge, run the stp root secondary command. The
priority value of this switching device is 4096.
A switching device cannot act as a primary root bridge and a secondary root bridge at the same time.
----End
8.2.4 (Optional) Setting the Path Cost for a Port
The STP/RSTP path cost determines root port selection. The port from which to the root port
costs the least is selected as the root port.
Context
A path cost is port-specific, which is used by STP/RSTP as a reference to select a link.
The range of the path cost value is determined by the calculation method. After the calculation
method is determined, you are recommended to set a relatively small path cost value for the port
at a high link rate.
Use the Huawei proprietory calculation method as an example. Different link rates correspond
to default path cost values of ports. For details, see Table 8-5.
Table 8-5 Mappings between link rates and path cost values
Link Rate
Recommended
value
Recommended
Value Range
Value Range
10 Mbit/s 2000 200-20000 1-200000
100 Mbit/s 200 20-2000 1-200000
1 Gbit/s 20 2-200 1-200000
10 Gbit/s 2 2-20 1-200000
Over 10 Gbit/s 1 1-2 1-200000
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 8 STP/RSTP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
391
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