FCoE Forwarder Configuration in TRILL Networks
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Solution Overview
Problem
The implementation of Fibre Channel over Ethernet (FCoE) in a Transparent Interconnection of Lots of Links (TRILL) network environment faces challenges due to the assumption of a single physical network, which conflicts with traditional dual SAN A/SAN B physical separation, necessitating a new approach for uniform and predictable operations.
Innovation Solution
The solution involves configuring virtual storage area networks (SANs) in a TRILL network with leaf switches functioning as FCoE Forwarders for Layer 3 switching and spine switches performing Layer 2 forwarding, utilizing Ethernet redundancy techniques and logical separation of SANs to ensure high availability and resilience against fabric-wide control plane failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dual SAN A/SAN B physical separation is used, then network reliability is improved, but device complexity and management cost increase
Solution Approach 1:
The patent merges the traditional physical separation of dual SANs into a single physical network infrastructure. By implementing FCoE over a unified Ethernet network with logical separation through virtual SANs (VSANs), the system maintains reliability through logical partitioning while eliminating the complexity of maintaining separate physical SAN fabrics. Leaf switches function as FCoE forwarders that forward frames according to FCoE protocol, enabling this consolidation.
Solution Approach 2:
The patent segments the network into different broadcast domains to provide logical separation of SANs. Each virtual SAN is mapped to specific broadcast domains, allowing multiple virtual SANs to coexist on a single physical network. This segmentation approach maintains the isolation and reliability benefits of dual SANs while using a single physical infrastructure, thereby reducing device complexity.
2Device complexity
If FCoE is implemented in TRILL network, then equipment cost is reduced, but network reliability may be compromised without proper redundancy
Solution Approach 1:
The patent implements Ethernet redundancy techniques in advance to cushion against potential network failures. By configuring redundancy mechanisms such as link aggregation and redundant paths before failures occur, the system ensures high availability and resilience against fabric-wide control plane failures. This beforehand cushioning allows the system to maintain reliability while using cost-effective FCoE infrastructure.
3Device complexity
If single physical network is used for FCoE, then management cost is reduced, but network reliability decreases due to lack of physical separation
Solution Approach 1:
The patent segments the single physical network into multiple logical broadcast domains through virtual SAN mapping. This segmentation allows multiple virtual SANs to be isolated from each other while sharing the same physical infrastructure, thereby maintaining the reliability benefits of physical separation without the management complexity and cost of maintaining separate physical networks.
4Reliability
If broadcast domain separation is implemented, then network reliability is improved through isolation, but device complexity increases
Solution Approach 1:
The patent implements a universal mapping approach where virtual SANs are mapped to broadcast domains in a standardized manner. Leaf switches are configured as FCoE forwarders that automatically handle frame forwarding based on FCoE protocol, reducing the complexity of manual configuration. This universal approach allows broadcast domain separation to be achieved through consistent, automated processes rather than complex, device-specific configurations.
Data Source
AI summary
An example method for Fibre Channel over Ethernet (FCoE) support in a Transparent Interconnection of Lots of Links (TRILL) network environment is provided and includes configuring at least two virtual storage area networks (SANs) in a TRILL network environment, which includes a plurality of leaf switches and spine switches, with each leaf switch being configured as a FCoE forwarder (FCF) enabled to forward frames according to FCoE protocol, and configuring at least an edge broadcast domain and a transport broadcast domain for each virtual SAN at each leaf switch. The edge broadcast domain includes end device links between the leaf switch and one or more end devices, and the transport broadcast domain includes spine links between the leaf switch and the spine switches.