Aur Function - Avaya 3500 Series Getting Started

The main feature of the AUR is the ability to retain the configuration (CFG) image of a unit in a stack
during a unit replacement. The retained CFG image from the old unit is restored to the new unit.
Because retained CFG images are kept in the DRAM of the stack, the stack power must be kept on
during the procedure.
Important:
In order for AUR to function properly, the new unit and the existing units in the stack must all be
running the same version of software. If that is not the case, it must have at least release 5.1
software, so that image can be updated using AAUR feature.
Note:
ERS 3550Tand ERS 3550T-PWR+ units must have at least release 5.3 software.
Important:
AUR is intended for a stack configuration of two or more units. In a two-unit stack configuration,
if a unit fails, the remaining unit becomes a stand-alone switch. AUR loads the configuration of
the failed unit in the replacement of switch unit only if the failed unit was a non-Base Unit.
Other information related to this feature:
• The new unit must be the same hardware configuration as the old, including the same number
of ports.
• If the administrator adds a new unit with a different hardware configuration, the configuration of
this unit is used.
• If the administrator adds a new unit with the same hardware configuration, the previous
configuration of the new unit is lost. The previous configuration of the new unit is overwritten
with the restored configuration from the stack.
• This feature can be disabled/enabled at any time with ACLI. The default mode is ENABLE.
• Customer log messages are provided.
Important:
After starting a stack, use ACLI command show stack auto-unit-replacement from a
unit console to find out if that unit is ready for replacement.

AUR function

The CFG mirror image is a mirror of a CFG image (in FLASH) of a unit in a stack. The mirror image
does not reside in the same unit with the CFG image. The unit that contains 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 has been removed from the stack.
When a CFG mirror image becomes INACTIVE, the INACTIVE CFG mirror image is copied to
another unit.
July 2015
Comments on this document? infodev@avaya.com
Getting Started with Avaya ERS 3500 Series
Auto Unit Replacement
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