Auto Unit Replacement
Enable Auto Unit Replacement (AUR) to replace a failed device in a stack.
AUR allows you to replace a failed unit in a stack with a new unit while retaining the
configuration of the previous unit. The stack power must be on during unit replacement.
If the model of the replaced unit is different from the previous unit, the unit is allowed to join
the stack. However, the configuration of the previous unit cannot be replicated in the new
unit.
AUR can be enabled or disabled from ACLI and EDM. By default, AUR is enabled.
Beginning with Release 5.5, you can remove entries from the Automatic Unit Replacement
(AUR) cache. You can use this enhancement to remove the MAC address for a non-operational
stack switch from the AUR address cache. A non-operational switch is a unit that is not present
in the stack or is in an unknown restore state.
With this enhancement, you can also display MAC address and operational status information
for all switches in a stack.
When you remove the MAC address for a non-operational stack switch from the AUR address
cache, information about switch hardware type and configuration is maintained on the base
unit switch. When the same non-operational switch or a replacement unit is inserted into the
stack, AUR performs a hardware type match, and because the switch MAC address was
erased, AUR is performed on the inserted switch.
If you attempt to remove the MAC address for an operational switch from the AUR address
cache, the base unit switch displays an error message, and the MAC address is not
removed.
For more information about AUR, see Configuring Systems on Avaya Ethernet Routing Switch
4000 Series, NN47205-500.
Diagnostic Auto Unit Replacement (DAUR)
DAUR provides the capability of updating the diagnostic image of the non-base unit with the
diagnostic image in the base unit of a stack. This happens if the AAUR feature is enabled in
the stack.
DAUR performs an upgrade of the diagnostic image on inserted units in the same way that
AAUR performs this function for agent code when AAUR is enabled.
After you enable the AAUR feature, it triggers a DAUR process if a stand-alone unit (with a
different version diagnostic image) is connected to the stack.
Troubleshooting tools
42 Troubleshooting Avaya ERS 4000 Series April 2014
Comments? infodev@avaya.com
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