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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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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 12-10  Enhanced P/A mechanism

    As shown in Figure 12-10, 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 use 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.

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Updated: 2019-05-25

Document ID: EDOC1000097279

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