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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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(Optional) Configuring a Priority for a Switching Device in an MSTI

(Optional) Configuring a Priority for a Switching Device in an MSTI


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.


  1. Run:


    The system view is displayed.

  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.


    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.

Updated: 2019-05-25

Document ID: EDOC1000097279

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