Difference between WWNN & WWPN

Posted on 2008-06-13
Medium Priority
Last Modified: 2013-11-14
Can anyone explain me the difference between WWPN and WWNN?
Question by:Kumar_Nachiketa
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Accepted Solution

Duncan Meyers earned 2000 total points
ID: 21784120
A WWNN (World Wide Node Name) is physically burnt to a Fibre Channel device such as a FC HBA or storage array. The WWNs are administred by the IEEE in much the same way as a MAC address is - the first few octets are assigned to a manufacturer, the rest is arbitrary. The WWPN (World Wide Port Name) is generated from the WWNN by the Fibre Channel fabric when the device logs into the fabric. Generally, it is usually set by changing one bit in the manufacturer's section of the WWNN. For example, a QLogic HBA WWNN starts with 20:00:... The asssigned WWPN is 21:00:...

This is the best overview of Fibre Channel out there - and it's by the guys who invented the protocol (CERN is the European Centre for Nuclear Research):

http://hsi.web.cern.ch/HSI/fcs/fcs.html and
http://hsi.web.cern.ch/HSI/fcs/spec.htm and

Author Closing Comment

ID: 31467130
Thnaks for the solution.
LVL 30

Expert Comment

by:Duncan Meyers
ID: 21787027
Thanks! Glad I could help.

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