the CFG image is called the Associated Unit (AU) of the CFG mirror image. The MAC Address
of the AU is called the
Associated MAC Address (AMA) of the CFG mirror image.
An active CFG Mirror Image is a CFG mirror image that has its AU in the stack. An INACTIVE
CFG Mirror Image is a CFG mirror image for which the associated AU is removed from the
stack. When a CFG mirror image becomes INACTIVE, the INACTIVE CFG mirror image is
copied to another unit.
The stack always keeps two copies of an INACTIVE CFG mirror image in the stack in case
one unit is removed—the other unit can still provide the backup INACTIVE CFG mirror
image.
CFG mirror image process
The CFG mirror image process is triggered by specific events.
Power Cycle
After a power cycle, all the CFG images in a stack are mirrored.
Figure 1: CFG mirror process
in stack on page 21 illustrates the CFG mirror images in a three-unit stack after the stack is
powered on. Unit 1 is the Base Unit (BU) and all other units are Non-Based Units (NBU).
• Unit 1 (BU) contains mirror images for unit 2 (CFG 2) and unit 3 (CFG3).
• Unit 2 (NBU), is the TEMP-BU. It contains a mirror image of unit 1 (CFG1), in case the
BU (unit 1) is removed from the stack.
• All three mirror images (CFG 1, CFG 2, and CFG 3) are active.
• Unit 2 is the AU of the CFG 2 mirror image.
• The Mac Address 2 is the AMA of the CFG2 mirror image.
System configuration fundamentals
20 Configuration — System April 2011
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