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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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MSTP Fast Convergence

MSTP Fast Convergence

MSTP supports both ordinary and enhanced Proposal/Agreement (P/A) mechanisms:
  • Ordinary P/A

    The ordinary P/A mechanism supported by MSTP is implemented in the same manner as that supported by RSTP. For details about the P/A mechanism supported by RSTP, see RSTP Technology Details.

  • Enhanced P/A

    Figure 11-10  Enhanced P/A mechanism

    As shown in Figure 11-10, in MSTP, the P/A mechanism works as follows:

    1. The upstream device sends a proposal to the downstream device, indicating that the port connecting to the downstream device wants to enter the Forwarding state as soon as possible. After receiving this BPDU, the downstream device sets its port connecting to the upstream device to the root port, and blocks all non-edge ports.

    2. The upstream device continues to send an agreement. After receiving this BPDU, the root port enters the Forwarding state.

    3. The downstream device replies with an agreement. After receiving this BPDU, the upstream device sets its port connecting to the downstream device to the designated port, and the port enters the Forwarding state.

By default, Huawei datacom devices use the fast transition mechanism in enhanced mode. To enable a Huawei datacom device to communicate with a third-party device that uses the fast transition mechanism in common mode, configure the Proposal/Agreement mechanism on the Huawei datacom device so that the Huawei datacom device works in common mode.

Updated: 2019-04-12

Document ID: EDOC1100041791

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