Which minimal configurations must becompleted for MSTP to work correctly?

The question asks for the minimal configurations required for Multiple Spanning Tree Protocol (MSTP) to work correctly on AOS-CX switches.

Analysis of Options:

Option A:Correct. The MSTP region name must be configured to define the MSTP region and ensure switches belong to the same region.

Option B:Incorrect. Bridge priority is optional and defaults to 32768; it’s not mandatory for MSTP functionality.

Option C:Correct. The MSTP revision number is required to ensure consistency across switches in the same region.

Option D:Incorrect. Enabling MSTP on interfaces is automatic for VLAN-enabled ports; explicit configuration is not mandatory.

Option E:Incorrect. Creating MSTP instances is optional and only needed for specific VLAN-to-instance mappings.

Why A and C are Correct:MSTP requires a consistent region configuration across all switches to function correctly. The minimal configuration includes:

MSTP region name:Defines the region (e.g., spanning-tree config-name REGION1) to group switches.

Revision number:Ensures region consistency (e.g., spanning-tree config-revision 1).

These settings ensure switches form a single MSTP region, allowing VLAN-to-instance mappings (default instance 0 if not specified) and loop prevention. Other settings, like bridge priority or explicit instance creation, are optional and not strictly required for basic MSTP operation.

Relevance to Certification Objectives:

Network Resiliency and Virtualization (8%):Designing and troubleshooting MSTP for redundancy and fault tolerance.

Switching (19%):Implementing Layer 2 technologies like MSTP for loop prevention.