A company uses Fibre Channel over Internet Protocol (FCIP) to connect their Fibre Channel fabrics into a unified, single-fabric SAN. The company requires high availability and performance in their…

A split-site link describes a topology concept, not a standard ISL redundancy configuration, and does not address both the high availability and performance requirements together.

A shared link means multiple traffic flows compete over a single ISL, which provides no redundancy and can become a performance bottleneck under load.

A single ISL is a single point of failure - any link or port failure will isolate the fabrics from each other, directly contradicting the high availability requirement.

Implementing two ISLs between the FCIP-linked fabrics eliminates the single point of failure that a single link creates - if one ISL fails, traffic continues over the second without fabric segmentation. Dual links can also be configured for ISL trunking or port channeling, distributing traffic across both paths to increase aggregate bandwidth and satisfy the performance requirement simultaneously.