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CLI-based Configuration Guide - Ethernet Switching

AR650, AR1600, and AR6100 V300R003

This document describes how to configure the components for LAN services, including link aggregation groups, VLANs, voice VLANs, MAC address tables, transparent bridging, as well as GVRP, STP/RSTP, and MSTP protocols.
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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 system-view

      The system view is displayed.

    2. Run stp enable

      MSTP is enabled on the switching device.

      By default, MSTP is enabled on a router.

  • Enable MSTP on an interface device.
    1. Run system-view

      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: 2019-04-12

Document ID: EDOC1100041791

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