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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Licensing Requirements and Limitations for MSTP

Licensing Requirements and Limitations for MSTP

Involved Network Elements

Other network elements also need to support MSTP.

Licensing Requirements

MSTP is a basic feature of a switch and is not under license control.

Version Requirements

Table 15-7  Products and versions supporting MSTP


Product Model

Software Version


S7703, S7706, S7712

V100R003C01, V100R006C00, V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007C00, V200R008C00, V200R009C00, V200R010C00, V200R011C10


S9703, S9706, S9712

V200R001(C00&C01), V200R002C00, V200R003C00, V200R005C00, V200R006C00, V200R007(C00&C10), V200R008C00, V200R009C00, V200R010C00, V200R011C10

To know details about software mappings, see Hardware Query Tool.

Feature Limitations

  • Table 15-8 lists the specification of MSTP.
    Table 15-8  Specification of MSTP
    Item Specification

    Maximum number of instances on the entire system


  • MSTP BPDUs may be discarded in a scenario wherein there are many MSTIs and MSTP multi-process is configured. This is due to the default CIR of STP being insufficient. (The default CIR of STP is insufficient because the length of MSTP BPDUs increases as the number of MSTIs increases, and the number of outgoing MSTP BPDUs increases when MSTP multi-process is configured.) To avoid this situation, increase the CIR of STP.

    If the CPCAR values are adjusted improperly, network services are affected. To adjust the CPCAR values of STP BPDUs, contact technical support personnel.

  • Enabling MSTP on a ring network immediately triggers spanning tree calculation. If basic configurations are not performed on switches and interfaces before MSTP is enabled, network flapping may occur upon changes to parameters such as device priority and interface priority.

Updated: 2019-10-18

Document ID: EDOC1000178310

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