In a switch, there are two WWNs. One is port WWN and the other is node WWN. What are the differences? Also, what is fabric login? Is it the same as DFA?

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Port WWN is the FC network ID for the particular switch port. All entities in an FC network have a WWN. Node WWN is the WWN of the node that is connected to a particular port. In other words it is the WWN of the system or storage device/subsystem that is connected to the switch port. I am not familiar with the acronym DFA so I don't know if it is the same or not - but I doubt it.

Marc Farley

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This was first published in November 2001

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