You are in a meeting with a customer where you are asked to explain the network redundancy feature Multiple Spanning Tree (MSTP). What is the correct statement for this feature?

The Multiple Spanning Tree Protocol (MSTP) configuration ID uniquely identifies an MST region. It consists of three components: a configuration name, a revision number, and a VLAN-to-instance mapping table. For switches to participate in the same MST region, all three components must match. According to official ArubaOS-CX documentation, the default MSTP configuration name is the MAC address of the switch, and the default configuration revision number is 0. Using the unique MAC address as the default name ensures that each switch initially belongs to its own separate region, preventing accidental and potentially disruptive region merges.

A. MSTP configuration ID revision by default as current MSTP root priority This is incorrect. The default MSTP configuration revision number is a static value of 0, not a dynamic value like the root bridge's priority.
B. MSTP configuration ID name by default using switch IMC address This is incorrect. The default name is the switch's MAC address. "IMC address" is not a technically accurate or standard term for the switch's MAC address in this context.
C. MSTP configuration ID name by default using switch serial number This is incorrect. While the serial number is a unique identifier, the documented default for the MSTP configuration name is the switch's MAC address.
D. MSTP configuration ID revision by default as switch serial number This is incorrect. The default revision is 0. The revision number is a 16-bit integer (0-65535), which is incompatible with the format of a switch serial number. ---

1. ArubaOS-CX 10.12 Layer 2 Bridging Guide

Page 138

"Multiple Spanning Tree Protocol (MSTP)" section.

It states: "To be in the same MST region

switches must have the same configuration name

revision number

and VLAN-to-instance mapping."

Under the description for the spanning-tree config-name command

it specifies: "The default is the switch MAC address."

Under the description for the spanning-tree config-revision command

it specifies: "The default is 0."