BMC Out-of-Band PCIe Switch Control for Dynamic Fabric Management

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Solution Overview

Problem

In hyperscale environments like data centers, the dynamic configuration of PCIe switches is challenging due to the lack of local system access, making traditional in-band methods ineffective for managing PCIe switch connections and configurations.

Innovation Solution

Implementing a Baseboard Management Controller (BMC) with out-of-band capabilities to manage PCIe switches using protocols like IPMI and Redfish, enabling remote configuration and monitoring through an out-of-band interface, allowing dynamic management of PCIe fabric topology and scalability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional in-band methods are used to manage PCIe switches, then local system access is required, but this makes management ineffective in hyperscale environments where local access is unavailable

Engineering Contradiction:

ImprovePCIe switch management accessibilityVSAvoidEnvironment compatibility

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent introduces a management controller as an intermediary device that enables out-of-band access to PCIe switches. This controller acts as a mediator between the external management system and the PCIe switch, allowing configuration and monitoring without requiring local system access. The management controller receives management instructions from external systems and translates them into appropriate PCIe switch control commands, thus resolving the contradiction between accessibility and environment compatibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If out-of-band management is implemented using BMC, then remote configuration is enabled, but system complexity increases

Engineering Contradiction:

ImproveRemote management capabilityVSAvoidSystem architecture complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The management controller is designed to perform multiple functions including PCIe switch configuration, monitoring, and control through a single out-of-band interface. By consolidating these management functions into one universal controller that supports both IPMI and Redfish protocols, the system achieves remote management capability without proportionally increasing complexity. The controller handles diverse management tasks through standardized interfaces, reducing the need for multiple separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If dynamic configuration of PCIe switches is enabled, then scalability is improved, but control difficulty increases due to lack of local access

Engineering Contradiction:

ImprovePCIe fabric scalabilityVSAvoidConfiguration control difficulty

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The management controller pre-configures PCIe switch settings and parameters before they are needed for dynamic operations. By establishing management instructions and configuration templates in advance through the out-of-band interface, the system enables rapid dynamic reconfiguration without requiring complex real-time control decisions. This preliminary preparation of management data simplifies the control process while maintaining scalability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12487959B2Enabling out-of-band generic PCIe switch control/configuration management using BMC for dynamic, scalable hardware requirements

Publication Date: 2025.12.02 AMERICAN MEGATRENDS

AI summary

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a BMC. The BMC receives a management instruction directed to a Peripheral Component Interconnect Express (PCIe) switch. The BMC generates a corresponding command for the PCIe switch based on the management instruction. The BMC transmits the corresponding command to the PCIe switch to configure or operate the PCIe switch dynamically.