configure mstp format

configure mstp format format_identifier


Configures the number used to identify the MSTP (Multiple Spanning Tree Protocol) BPDUs sent in the MSTP region.

Syntax Description

format_identifier Specifies a number that MSTP uses to identify all BPDUs sent in the MSTP region. The default is 0. The range is 0 to 255.


The default value used to identify the MSTP BPDU is 0.

Usage Guidelines

For a switch 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 contained in a region transmit and receive BPDUs that contain information relevant to only that MSTP region. By having devices look at the region identifiers, MSTP discovers the logical boundary of a region.

If you have an active MSTP region, Extreme Networks recommends that you disable all active STPDs in the region before modifying the value used to identify MSTP BPDUs on all participating switches.


The following command configures the number 2 to identify the MSTP BPDUs sent within an MSTP region:

configure mstp format 2


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.