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Implementing an IBM b-type SAN with 8 Gbps Directors and Switches by Jose Rodriguez Ruibal, Shanmuganthan Kumaravel, Michael Engelbrecht, Uwe Dubberke, Jon Tate

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Multiple switches and fabrics
In this chapter, we discuss the considerations for multiple switch environments, such as merging fabrics, duplicate domain IDs, zoning configuration conflicts, and operating parameter conflicts.
13.1 Multiple switch environments
In this section, we focus on multiple switch environment considerations.
13.1.1 Gateway links
A gateway merges SANs into a single fabric by establishing point-to-point E_Port connectivity between two Fibre Channel switches that are separated by a network with a protocol such as IP or SONET. ...

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