转自国外的论坛：
We are new to SAN and are going to use Brocade Switch for implementing the new SAN for running VMWare.
We notice that there is a difference between Single Switch and Full Fabric License. From the web, we find that for Full Fabric License, we can connect both FC Switches.
On the other hand, a fellow says that Full Fabric License is different from Trunking license.
We would like to know the difference between just connecting the 2 Switches with Trunking. In what circumstances, we connect 2 switches and when we need trunking ?
Thanks
He is right.
A Fabric License allows you to connect two or more switches to form a fabric.
Trunking allows a frame-level load sharing on two or more ISLs (Inter Switch Links) between two switches.
A Fibre Channel environment usually requires that all frames are received in the same order they were sent. By default, traffic between any two devices uses only one ISL (Inter Switch Link), even if two or more interconnects exist to avoid that a frame gets ahead of one that was sent earlier.
Trunking uses special hardware features within a switch and has some requirements, e.g. only a subset of ports can form a trunking group or the distance of all ISLs within a trunk must be within a certain range.
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原文地址：http://www.brocader.cn/brocade-tech/brocade-full-fabric-trunking-license.html
