Nortel Passport 15000, Hardware Installation And Maintenance, Page: 180 / 874

180 Chapter 12 MAC address module
241-1501-240 5.2S2
• The MAC address module provides the unique node identification within
a network. Its address is read by the system only at initial power up, after
power cycling, or a software startup, restart, reboot, or reset.
• Duplicated addresses can occur when:
— a MAC address module is replaced in a switch (for example, switch
A) and switch A does not undergo a manual or a system reset
— the MAC address module from switch A replaces the one in switch B
— as soon as switch B undergoes a manual or a system reset, restart, or
reboot before switch A does, then switch B’s new address is the
same as switch A’s former address because the former address itself
had not actually been replaced yet
• Unlike most other hardware parts of the system, there is no software
command associated with preparing the MAC address module for
removal.
• The alarm 7012 0053 indicates when a MAC address module has failed.
• There is no software or hardware alarm for removing the MAC address
module itself or leaving its slot empty.
MAC address module replacement task flow
This task flow shows the procedures you do to replace the MAC address
module. To link to any procedure, go to “Task flow navigation” (page 181).