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Brocade Inter-Switch Link (ISL) Trunking is an optional software product available for all Brocade 2 and 4 Gbit/sec Fiber Channel switches and directors. This technology is ideal for optimizing performance and simplifying the management of multi-switch SAN fabrics containing Brocade 1, 2, and 4 Gbit/sec switches and directors. When two or more adjacent ISLs are used to connect two switches, the switches automatically group the ISLs into a single logical ISL, or "trunk." The throughput of the resulting trunk can be anywhere from 4 Gbit/sec to as much as 32 Gbit/sec.