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.
The figure that follows illustrates the CFG mirror images in a three-unit stack after the stack is
powered on. Unit 1 is the Based 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 (CFG 3).
• Unit 2 (NBU), is the TEMP-BU. It contains a mirror image of unit 1 (CFG 1), 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 Associated Unit of the CFG 2 mirror image.
• The MAC Address 2 is the Associated MAC Address (AMA) of the CFG 2 mirror image.
Figure 5: CFG mirror process in stack
Getting started fundamentals
30 Getting Started with Avaya ERS 3500 Series July 2015
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