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FCID on two separate fabrics

Is it possible to have the same FCID appear on two separate fabrics? If so, under what conditions?

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Assuming two fabrics are separate, either physically not connected or connected yet logically isolated using a segmentation router or some derivative of a virtual SAN implementation, you should be able to have the same FCID in separate fabrics. Having the same FCID appear multiple times in the same fabric however is not a good thing for the health and well being of your fabric and needs to be avoided.

This was first published in March 2007