Nortel Networks 2500 Series manual AUR function

Auto Unit Replacement 55

ATTENTION

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 standalone switch. AUR loads the configuration of the failed unit in the replacement of ERS 2500 Series unit if the failed unit was a non-Base Unit.

AUR is not designed for the situation of removing and reinserting the same switch (with the same MAC address).

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. It is overwritten with the restored configuration from the stack.

•This feature can be disabled/enabled at any time using the CLI. The default mode is ENABLE.

•Customer log messages are provided.

ATTENTION

After booting a stack, use the CLI 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.

The stack always keeps two copies of an INACTIVE CFG mirror image in the stack in case one unit is removed–the other unit can still provide the backup INACTIVE CFG mirror image.

Nortel Ethernet Routing Switch 2500 Series

Overview — System Configuration

NN47215-500 (323162-B) 02.02 Standard

4.1 19 November 2007

Copyright © 2007, Nortel Networks