Fibre Channel Switch Stacking via Ethernet Links
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Solution Overview
Problem
Fibre Channel systems face limitations in domain space due to the limited length of domain identifiers, making it difficult to expand the number of domains without using bulky and expensive 'director-class' systems.
Innovation Solution
The implementation of a system enclosure with Fibre Channel modules and a switch processor that applies a stacking header to Fibre Channel packets for transmission over a stacking link between switches, allowing for modular expansion of ports without the need for 'director-class' equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Fibre Channel ports are added to expand domain space, then the number of available ports increases, but the system requires bulky and expensive director-class equipment
Solution Approach 1:
The system divides the Fibre Channel domain expansion into modular components by using standard Ethernet switches with Fibre Channel over Ethernet capability. Each switch can be independently added to expand port capacity without requiring a complete system redesign or expensive director-class equipment.
Solution Approach 2:
The patent introduces Fibre Channel over Ethernet as an intermediary technology that bridges standard Ethernet infrastructure with Fibre Channel storage networking. This allows Fibre Channel ports to be added through existing Ethernet switches rather than requiring specialized director-class Fibre Channel equipment.
2Quantity of substance
If domain identifiers are extended to accommodate more domains, then the domain space increases, but the identifier length is limited
Solution Approach 1:
The system transitions from a flat domain identifier structure to a hierarchical domain structure using Fibre Channel over Ethernet stacking. Domains are organized in layers through Ethernet switches, allowing expansion beyond the limitations of traditional 128-domain Fibre Channel identifiers by adding domain layers rather than extending identifier length.
3Device complexity
If standard Ethernet switches are used for Fibre Channel expansion, then cost and complexity are reduced, but stacking headers must be applied to packets
Solution Approach 1:
The Ethernet switches are equipped with built-in Fibre Channel over Ethernet stacking capability that automatically applies stacking headers to Fibre Channel packets without requiring external intervention. The switches self-manage the packet encapsulation and domain routing, simplifying system deployment while handling the packet processing complexity internally.
Data Source
AI summary
An information handling system is provided. The information handling system includes systems and methods for expanding the port count in a single Fiber Channel domain by adding modular Fiber Channel switches. Such a system includes a system enclosure that contains a plurality of Fiber Channel modules configured to send and receive Fiber Channel packets, the Fiber Channel modules providing a plurality of Fiber Channel ports and a switch processor coupled to the plurality of Fiber Channel ports and to a plurality of Ethernet ports. The switch processor is configured to apply a stacking header to Fiber Channel packets for transmission from one of the plurality of Ethernet ports over a stacking link to another switch processor in another system enclosure.