Huawei AR3200 Series - Optional) Configuring the Path Cost for a Port

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 the primary root bridge, run the stp root primary command. 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 as a secondary root bridge at the same time.
l If you want to change the priority of a switching device after you run the stp root primary command
or the stp root secondary command to configure the switching device as the primary root bridge or
secondary root bridge, disable the root bridge function or secondary root bridge function, and then run
the stp priority priority command to set a priority.
----End
7.3.4 (Optional) Configuring 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 and is used by STP/RSTP to select a link.
The path cost value range is determined by the calculation method. After the calculation method
is determined, it is recommended that you set a relatively small path cost value for the ports with
high link rates.
In the Huawei proprietary calculation method for example, the link rate determines the
recommended value for the path cost. Table 7-5 lists the recommended path costs for ports with
different link rates.
Table 7-5 Mappings between link rates and path cost values
Link Rate
Recommended
Path Cost
Recommended
Path Cost Range
Path Cost Range
10 Mbit/s 2000 200 to 20000 1 to 200000
100 Mbit/s 200 20 to 2000 1 to 200000
1 Gbit/s 20 2 to 200 1 to 200000
10 Gbit/s 2 2 to 20 1 to 200000
Over 10 Gbit/s 1 1 to 2 1 to 200000
Huawei AR3200 Series Enterprise Routers
Configuration Guide - LAN 7 STP/RSTP Configuration
Issue 02 (2012-03-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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