Interface Switch for Multi-Vendor Fibre Channel Fabric Interconnection

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Solution Overview

Problem

The scaling of dynamic Fibre Channel fabrics is challenging due to compatibility concerns when switches from different manufacturers are used, leading to performance limitations and locking users into specific manufacturers, limiting the selection of cost-effective devices with additional features.

Innovation Solution

An interface switch that uses N_port Virtualization (NPV) to connect fabrics from different manufacturers, allowing each fabric to operate in a high-performance mode by mapping N_port identifiers to proxy addresses and mediating control traffic, enabling isolation and scalability while acting as an initiator, throttle, and protocol gateway.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If switches from different manufacturers are connected in Fibre Channel fabrics, then device selection flexibility and cost-effectiveness are improved, but compatibility issues and performance degradation occur

Engineering Contradiction:

Improvedevice selection flexibilityVSAvoidfabric performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The interface switch acts as an intermediary device between fabrics from different manufacturers. It presents itself as a switch to the first enterprise fabric and as a host or node to the second enterprise fabric, enabling interconnection while maintaining compatibility and performance in each fabric without requiring interoperability mode

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system segments the multi-vendor Fibre Channel network into separate enterprise fabrics that can operate independently in high-performance mode. The interface switch enables these segmented fabrics to communicate without merging them, allowing each fabric to maintain its performance characteristics while still achieving multi-vendor compatibility

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If interoperability mode is used to connect different manufacturer devices, then device compatibility is improved, but performance improvement features are lost

Engineering Contradiction:

Improvedevice compatibilityVSAvoidfabric performance features

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The interface switch serves as a mediator that enables different manufacturer devices to communicate without activating interoperability mode. By presenting appropriate interface types (switch to first fabric, host/node to second fabric), it allows each fabric to operate in its native high-performance mode while still achieving cross-vendor compatibility

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If enterprise fabrics are directly connected, then traffic flow between fabrics is simplified, but fabric isolation and security are reduced

Engineering Contradiction:

Improvetraffic flowVSAvoidfabric security and isolation

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The interface switch acts as an intermediary that maintains fabric isolation while enabling controlled traffic flow. It mediates all traffic between the two enterprise fabrics, allowing necessary communication while preventing unauthorized access and maintaining security boundaries. The switch can enforce perimeter defenses and act as a firewall against attacks

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system maintains segmented, isolated enterprise fabrics rather than merging them. The interface switch enables communication between the segmented fabrics without compromising their isolation, allowing each fabric to maintain its security boundaries while still achieving inter-fabric traffic flow through the controlled intermediary

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8897294B2Interface switch for use with fibre channel fabrics in storage area networks

Publication Date: 2014.11.25 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

An interface switch which presents itself as switch to an enterprise fabric formed of the devices from the same manufacturer as the interface switch and that of a host or node to an enterprise fabric from a different manufacturer. This allows each enterprise fabric to remain in a higher performance operating mode. The multiplexing of multiple streams of traffic between the N_ports on the first enterprise fabric and the second enterprise fabric is accomplished by N_port Virtualization. The interface switch can be connected to multiple enterprise fabrics. All control traffic address mappings between virtual and physical addresses may be mediated and translated by the CPU of the interface switch and address mappings for data traffic performed at wire speed. Since the interface switch may preferably be a single conduit between the enterprise fabrics, it is also a good point to enforce perimeter defenses against attacks.