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Designing Storage Area Networks: A Practical Reference for Implementing Fibre Channel and IP SANs, Second Edition by Tom Clark

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Chapter 4. Fibre Channel SAN Topologies

Fibre Channel architecture has evolved three distinct physical topologies to support connectivity between networked devices: point-to-point, arbitrated loop, and fabric. The first Fibre Channel configurations were built on a dedicated, point-to-point connection between two nodes. Participants in a point-to-point topology establish an initial connection via login and then assume full bandwidth availability. Arbitrated loop allows more than two devices to communicate over a shared media. An initiator in a loop environment must negotiate for access to the media before launching a transaction. A Fibre Channel fabric topology provides multiple, concurrent, point-to-point connections via link-level switching, ...

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