Avaya 4524GT, Configuration Manual

Page: 22 / 362

Figure 2: CFG mirror images in the stack after adding unit 4
Removing an NBU
When you remove an NBU 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 you remove unit 4 from the stack shown in Figure 2: CFG mirror images in
the stack after adding unit 4 on page 22, the CFG 4 mirror image becomes INACTIVE (see
Figure 3: CFG mirror images after removing unit 4 on page 23). Another copy of the
INACTIVE CFG 4 mirror image is also created in unit 2.
System configuration fundamentals
22 Configuration — System April 2011