Avaya 4524GT Configuration Manual page 28

System configuration fundamentals
When the switch finishes the diagnostic image version update, the switch performs an AAUR
check. If the new unit has the same agent image as the stack, the unit reboots. If the new unit
has a different agent image, the switch performs an AAUR.
Note:
The new unit added on a stack must have an agent image with software release 5.1.0 or
higher or AAUR and DAUR cannot upgrade the new unit.
The following table shows expected AAUR and DAUR behavior for different situations.
Table 4: Examples of AAUR and DAUR behavior in different situations
Stack master image and
diagnostic version
Software 5.0/5.1
Diagnostic 5.0/5.1
Software 5.0/5.1
Diagnostic 5.2
Software 5.2_SSH/non
SSH Diagnostic 5.2
With version 5.2, when stack forced-mode is enabled and the base unit remains, Agent Auto
Unit Replacement and Diagnostic Unit Replacement are working as explained on the
preceding table.
28 Configuration — System
Slave image
diagnostic version
Software 5.0/5.1
Diagnostic 5.0/5.1
Software 5.0/5.1
Diagnostic 5.2
Software 5.2
Diagnostic 5.0/5.1
Software 5.2
Diagnostic 5.2
Software 5.0/5.1
Diagnostic 5.0/5.1
Software 5.0/5.1
Diagnostic 5.2
Software 5.2_non
SSH/SSH Diagnostic
5.1
Software 5.2_non
SSH/SSH Diagnostic
5.2
Expected behavior
Same image. Unit joins stack.
Same image. Unit joins stack.
AAUR performed. AAUR downgrades
the unit image and reboots the unit.
The unit joins the stack after the
reboot. No DAUR performed as DAUR
is unavailable on 5.0/5.1
AAUR performed. AAUR upgrades the
unit image then reboots the stack.
DAUR upgrades the diagnostic image
then reboots the unit. The unit joins the
stack after the reboot.
AAUR performed. AAUR upgrades the
unit image then reboots the unit. Since
the diagnostic images are the same,
the unit joins the stack.
Since the diagnostic and agent images
are the different, DAUR upgrades the
diagnostic image, and then AAUR
transfers the agent. AAUR and DAUR
reboot the unit. The unit joins the stack
after the reboot.
AAUR performs the agent image
transfer and reboots the unit. The unit
joins the stack after the reboot.
April 2011