Adding a unit:
In a stack that does not have any INACTIVE CFG mirror images, adding a new unit causes the CFG
image of the new unit to be mirrored in the stack. For example, in the figure that follows, after adding
unit 4 to the stack, the CFG 4 mirror image is created in the BU (unit 1).
Figure 6: CFG mirror images in the stack after adding unit 4
Removing an NBU:
When an NBU is removed from a stack, the related CFG mirror image in the stack becomes
INACTIVE.
The AUR feature ensures that the stack always has two copies of an INACTIVE CFG mirror image.
These two copies must not reside in the same unit in the stack.
For example, after the removal of unit 4 from the stack, the CFG 4 mirror image becomes INACTIVE
(shown in the figure that follows). Another copy of the INACTIVE CFG 4 mirror image is also created
in unit 2.
Auto Unit Replacement
July 2015 Getting Started with Avaya ERS 3500 Series 31
Comments on this document? infodev@avaya.com
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