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FlexAddress
The FlexAddress feature allows server modules to replace the factory assigned World Wide Name and Media Access
Control (WWN/MAC) network IDs with WWN/MAC IDs provided by the chassis. FlexAddress is delivered on a Secure
Digital (SD) card that must be inserted into the CMC to provide the chassis-assigned WWN/MAC IDs.
Every server module is assigned unique WWN and MAC IDs as part of the manufacturing process. Before the
FlexAddress feature was introduced, if you had to replace one server module with another, the WWN/MAC IDs would
change and Ethernet network management tools and SAN resources would need to be reconfigured to be aware of the
new server module.
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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