FCoE Link Initialization with Dual MAC Address Segmentation

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Solution Overview

Problem

Current methods for managing MAC addresses in high-performance networks, such as Fibre Channel and Ethernet, are incompatible and cause market confusion, hindering the adoption of solutions like Server Provided MAC Addresses (SPMA) and Fabric Provided MAC Addresses (FPMA).

Innovation Solution

A method is introduced to initialize a Fibre Channel over Ethernet (FCoE) link by discovering Fibre Channel Forwarders, assigning second MAC addresses, and distinguishing management and initialization processes using separate Ethertypes, allowing for seamless selection of appropriate MAC addresses without modifying existing standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Server Provided MAC Addresses (SPMA) or Fabric Provided MAC Addresses (FPMA) are implemented, then MAC address management is improved, but market confusion increases and adoption is hindered

Engineering Contradiction:

ImproveMAC address management capabilityVSAvoidmarket confusion

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent segments the MAC address management process into two distinct phases: initialization phase using first MAC addresses and normal Fibre Channel operation using second MAC addresses. This segmentation allows different MAC address methods to coexist without confusion, as each phase has its own designated address type.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary mechanism where Fibre Channel Forwarders assign and manage second MAC addresses during normal operation, while the initialization phase uses first MAC addresses for discovery and setup. This intermediary approach resolves market confusion by providing a clear transition path between different MAC address management methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If MAC addresses are assigned during Fibre Channel operation, then network operation is disrupted, but if assigned during initialization only, then FCoE link integration is simplified

Engineering Contradiction:

ImproveFCoE link integrationVSAvoidnetwork operation continuity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent performs MAC address assignment during the initialization phase before normal Fibre Channel operation begins. The host discovers FCFs and receives second MAC addresses during initialization, then uses these addresses for subsequent normal operation. This preliminary action eliminates the need to disrupt network operations for address assignment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent divides the MAC address assignment process into initialization phase (using first MAC addresses) and normal operation phase (using second MAC addresses). This segmentation ensures that address assignment does not interrupt normal Fibre Channel data transmission, maintaining network reliability.

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If separate Ethertypes are used for management and initialization processes, then process distinction is improved, but protocol complexity increases

Engineering Contradiction:

Improveprocess distinction capabilityVSAvoidprotocol structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the Fibre Channel over Ethernet protocol into two distinct parts: initialization protocol using first MAC addresses and Fibre Channel operation protocol using second MAC addresses. This segmentation allows clear process distinction while maintaining manageable protocol complexity through standardized Ether types for each phase.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8108454B2Address assignment in Fibre Channel over Ethernet environments

Publication Date: 2012.01.31 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

A method of initializing a Fiber Channel over Ethernet (FCoE) link between a Fiber Channel over Ethernet node (ENode) and Fiber Channel Forwarders (FCFs) in a network by discovering the presence of FCFs available to the ENode and other FCFs, assigning second MAC addresses to the ENode corresponding to each available FCF, and converting from a management and initialization process using the first MAC address to normal Fiber Channel operation using the second MAC addresses. The implementations described herein may additionally distinguish management and initialization processes from normal Fiber Channel operation using separate Ethertypes.