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NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access

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MSTP Fast Convergence

MSTP Fast Convergence

Multiple Spanning Tree Protocol (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 Rapid Spanning Tree Protocol (RSTP). For details about the P/A mechanism supported by RSTP, see RSTP Implementation.

  • Enhanced P/A

    Figure 10-11 Enhanced P/A mechanism

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

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

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

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

By default, Huawei routers use the enhanced P/A mechanism. If a Huawei router needs to communicate with a non-Huawei device that uses the ordinary P/A mechanism, run the stp no-agreement-check command to configure the Huawei router to use the ordinary P/A mechanism. In this manner, these two devices can communicate with each other.

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Updated: 2019-01-02

Document ID: EDOC1100058405

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