Dell PowerEdge M1000e Chassis Management Controller Firmware Version 5.1 User’s Guide

If a server is replaced, the FlexAddress for the slot remains the same for the given server slot. If the server is inserted in a new slot or chassis, the server-assigned WWN/MAC is used unless that chassis has the FlexAddress feature enabled for the new slot. If you remove the server, it reverts to the server-assigned address. You need not reconfigure deployment frameworks, DHCP servers, and routers for various fabrics for identifying the new server.

Every server module is assigned unique WWN and/or MAC IDs as part of the manufacturing process. Before FlexAddress, if you had to replace one server module with another, the WWN/MAC IDs changes and Ethernet network management tools and SAN resources had to be reconfigured to identify the new server module.

FlexAddress allows CMC to assign WWN/MAC IDs to a particular slot and override the factory IDs. Hence, if the server module is replaced, the slot-based WWN/MAC IDs remain 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 is used.

                                 <mac_start> + 0xCF (208 - 1) = mac_end
                              

where 208 is the mac_count and the formula is:

                              <mac_start> + 
                              <mac_count>  - 1 = 
                              <mac_end>
                           

(starting_mac)00188BFFDCFA + (mac_count)0xCF - 1 = (ending_mac)00188BFFDDC8