configure mstp region

configure mstp region regionName


Configures the name of an MSTP (Multiple Spanning Tree Protocol) region on the switch.

Syntax Description

regionName Specifies a user-defined name for the MSTP region. May be up to 32 characters.


By default, the switch uses the MAC address of the switch to generate an MSTP region.

Before you configure the MSTP region, it also has the following additional defaults:
  • MSTP format Identifier—0.
  • MSTP Revision Level—3.

Usage Guidelines

The maximum length for a name is 32 characters. Names can contain alphanumeric characters and underscores ( _ ) but cannot be any reserved keywords, for example, mstp. Names must start with an alphabetical character, for example, a, Z.

By default, the switch uses the unique MAC address of the switch to generate an MSTP region. Since each MAC address is unique, every switch is in its own region by default.

For multiple switches to be part of an MSTP region, you must configure each switch in the region with the same MSTP configuration attributes, also known as MSTP region identifiers. These identifiers consist of the following:
  • Region Name—The name of the MSTP region.
  • Format Selector—The number used to identify the format of MSTP BPDUs. The default is 0.
  • Revision Level—This identifier is reserved for future use; however, the switch uses and displays a default of 3.

You can configure only one MSTP region on the switch at any given time.

The switches inside a region exchange BPDUs that contain information for MSTIs. The switches connected outside of the region exchange CIST information. By having devices look at the region identifiers, MSTP discovers the logical boundary of a region.

If you have an active MSTP region, we recommend that you disable all active STPDs in the region before renaming the region on all of the participating switches.

Viewing MSTP Information

To view the MSTP configuration on the switch, use the show stpd command. Output from this command contains global MSTP settings, including the name of the MSTP region, the number or tag that identifies all of the BPDUs sent in the MSTP region, and the reserved MSTP revision level. If configured, the output also displays the name of the Common and Internal Spanning Tree (CIST), and the number of Multiple Spanning Tree Instances (MSTIs).


The following example creates an MSTP region named purple:

configure mstp region purple


This command was first available in ExtremeXOS 11.4.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.