User's Manual

Using FlexAddress 151
Using FlexAddress
The FlexAddress feature is an optional upgrade in CMC 1.1 that allows server
modules to replace the factory assigned World Wide Name/Media Access
Control (WWN/MAC) ID with a WWN/MAC ID provided by the chassis.
Every server module is assigned a unique WWN/MAC ID as part of the
manufacturing process. If you have to replace one server module with
another, the WWN/MAC ID will change and Ethernet network management
tools and SAN resources must be reconfigured to be aware of the new server
module.
FlexAddress allows the CMC to assign the WWN/MAC ID to a particular
slot and overrides the factory ID. If the server module is replaced, the slot-
based WWN/MAC ID remains the same. This 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 ID will be used.
Prior to installing FlexAddress, you can determine the range of MAC
addresses contained on their FlexAddress feature card by inserting the SD
card into an USB "Memory Card Reader" and viewing the file
"pwwn_mac.xml". The clear text XML file on the SD card will contain an
XML tag "mac_start" that 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: You should lock the SD card prior to inserting in the USB "Memory Card
Reader" to prevent accidently modifying any of the contents. You MUST UNLOCK
the SD card before inserting into the CMC.