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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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Enabling MSTP

Enabling MSTP


After configuring basic MSTP functions on a switching device, enable MSTP function.

After MSTP is enabled on a ring network, it immediately calculates spanning trees on the network. Configurations on the switching device, such as, the switching device priority and port priority, will affect spanning tree calculation. Any change to the configurations may cause network flapping. Therefore, to ensure rapid and stable spanning tree calculation, perform basic configurations on the switching device and its ports and enable MSTP.


  • Enable MSTP on a switching device.
    1. Run:


      The system view is displayed.

    2. Run:

      stp enable

      MSTP is enabled on the switching device.

      By default, MSTP is enabled on a industrial switch router.

  • Enable MSTP on an interface device.
    1. Run:


      The system view is displayed.

    2. Run:

      interface interface-type interface-number

      The interface view is displayed.

    3. Run:

      stp enable

      MSTP is enabled on the interface.

      By default, MSTP is enabled on the interface.

Follow-up Procedure

When the topology of a spanning tree changes, the forwarding paths to associated VLANs are changed. The ARP entries corresponding to those VLANs on the switching device need to be updated. MSTP processes ARP entries in either fast or normal mode.

  • In fast mode, ARP entries to be updated are directly deleted.

  • In normal mode, ARP entries to be updated are rapidly aged.

    The remaining lifetime of ARP entries to be updated is set to 0. The switching device rapidly processes these aged entries. If the number of ARP aging probe attempts is not set to 0, ARP implements aging probe for these ARP entries.

You can run the stp converge { fast | normal } command in the system view to configure the STP/RSTP convergence mode.

By default, the normal MSTP convergence mode is used.


The normal mode is recommended. If the fast mode is adopted, ARP entries will be frequently deleted, causing the CPU usage on device to reach 100%. As a result, network flapping will frequently occur.

Updated: 2019-05-25

Document ID: EDOC1000097279

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