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NE20E-S2 V800R010C10SPC500 Configuration Guide - LAN Access and MAN Access 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - LAN Access and MAN Access
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Configuring an MST Region

Configuring an MST Region

Multiple Spanning Tree Protocol (MSTP) divides a switching network into multiple MST regions. After a Multiple Spanning Tree (MST) region name, VLAN-to-instance mappings, and a Multiple Spanning Tree Protocol (MSTP) revision number are configured, MST region configuration is complete.

Context

An MST region contains multiple switching devices and network segments between them. These switching devices are directly connected and have the same region name, same VLAN-to-instance mapping, same configuration revision number after MSTP is enabled. One switching network can have multiple MST regions and multiple switching devices can be grouped into one MST region by using MSTP configuration commands.

NOTE:
Two switching devices belong to the same MST region when they have the same:
  • Name of the MST region

  • Mapping between VLANs and Multiple Spanning Tree Instances (MSTIs)

  • Revision level of the MST region

Do as follows on a switching device that needs to join an MST region:

Procedure

  • Configure the name of the MST region.
    1. Run system-view

      The system view is displayed.

    2. Run stp region-configuration

      The MST region view is displayed.

    3. Run region-name name

      The name of the MST region is configured.

    4. Run commit

      The configuration is committed.

  • Configure mappings between MSTIs and VLANs.

    NOTE:
    You can configure mappings between MSTIs and VLANs in the MST region view or in the VLAN instance view.

    Configure mappings between MSTIs and VLANs in the MST region view.

    1. Run system-view

      The system view is displayed.

    2. Run stp region-configuration

      The MST region view is displayed.

    3. Run instance instance-id vlan { vlan-id [ to vlan-id ] }&<1-10>

      Mappings between an MSTI and VLANs are configured.

      NOTE:

      A VLAN cannot be mapped to multiple MSTIs. If you map a VLAN that is already mapped to an MSTI, to another MSTI, the original mapping will be canceled.

      The vlan-mapping modulo modulo command configures mappings between MSTIs and VLANs based on a default algorithm. However, the mappings configured using this command cannot always meet the actual demand. Exercise caution when using this command.

    4. Run commit

      The configuration is committed.

    Configure mappings between MSTIs and VLANs in the VLAN instance view.

    1. Run system-view

      The system view is displayed.

    2. Run vlan instance

      The VLAN instance view is displayed.

    3. Run instance instance-id vlan { vlan-id [ to vlan-id ] }&<1-10>

      Mappings between an MSTI and VLANs are configured.

      NOTE:

      Do not run both the vlan instance command and the stp region-configuration command on the same device. If mappings between MSTIs and VLANs have been configured in the MST region view displayed by the stp region-configuration command, you must delete the configured mappings before using the vlan instance command.

    4. (Optional) Run check vlan instance mapping

      The mappings between MSTIs and VLANs are checked.

    5. Run commit

      The configuration is committed.

  • (Optional) Configure the revision level of the MST region.
    1. Run system-view

      The system view is displayed.

    2. Run stp region-configuration

      The MST region view is displayed.

    3. Run revision-level level

      The MSTP revision level of the MST region is configured.

      To modify the MSTP revision level of the MST region to which the switching device belongs, run this command.

    4. Run commit

      The configuration is committed.

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Updated: 2019-01-02

Document ID: EDOC1100055378

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