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FlexAddress allows the CMC to assign WWN/MAC IDs to a particular slot and override the factory IDs. If
the server module is replaced, the slot-based WWN/MAC ID remains the same. This feature eliminates the
need to reconfigure Ethernet network management tools and SAN resources for a new server module.
Additionally, the override action only occurs when a server module is inserted in a FlexAddress enabled
chassis; no permanent changes are made to the server module. If a server module is moved to a chassis
that does not support FlexAddress, the factory assigned WWN/MAC IDs are used.
Prior to installing FlexAddress, you can determine the range of MAC addresses contained on a
FlexAddress feature card by inserting the SD card into an USB Memory Card Reader and viewing the file
pwwn_mac.xml. This clear text XML file on the SD card contains an XML tag mac_start, which is the first
starting hex MAC address that will be used for this unique MAC address range. The mac_count tag is the
total number of MAC addresses that the SD card allocates. The total MAC range allocated can be
determined by:
<mac_start> + 0xCF (208 - 1) = mac_end
For example:
(starting_mac)00188BFFDCFA + 0xCF = (ending_mac)00188BFFDDC9
NOTE: To prevent modifying any of the contents accidentally, you must lock the SD card prior to
inserting in the USB "Memory Card Reader". You must then unlock the SD card before inserting it
into the CMC.
For more information on the FlexAddress feature, see the following resources:
• The CMC Secure Digital (SD) Card Technical Specification document at support.dell.com/manuals
• The Help link in the CMC web interface
• The FlexAddress information in the CMC User’s Guide at support.dell.com/manuals
FlexAddress Plus
FlexAddress Plus expands the number of MAC addresses to 3136 from the original FlexAddress pool of
208.
FlexAddress Plus is provided on the FlexAddress Plus Secure Digital (SD) card along with the FlexAddress
feature.
NOTE: The SD card labeled FlexAddress only contains FlexAddress and the card labeled FlexAddress
Plus contains FlexAddress and FlexAddress Plus. The card must be inserted into the CMC to activate
the feature.
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