Auto Unit Replacement
121
To set up a stack, perform the following procedure.
Step
Action
1
Power down all switches.
2
Set the Unit Select switch in the back of the non base units to the
off position.
3
Set the Unit Select switch in the back of the base unit to base
position.
4
Ensure all cascade modules are properly seated.
5
Ensure all the cascade cables are properly connected and screwed
into the unit.
6
Power up the stack.
Note: In a mixed stack, any switch can act as the base unit.
—End—
Auto Unit Replacement
You can use the Auto Unit Replacement (AUR) feature to replace a unit from
a stack while retaining the configuration of the unit. This feature requires the
stack power to be on during the unit replacement.
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 on
during the procedure.
Note 1: For Auto Unit Replacement to function properly, the new unit
and the existing units in the stack must all run the same version of
software.
Note 2: Auto Unit Replacement does not work on a stack of two units
only. In this configuration, if a unit fails, the remaining unit becomes
a stand-alone switch and Auto Unit Replacement does not load the
configuration of the failed unit if it is replaced.
The following information also relates to this feature:
•
The new unit must be the same hardware configuration as the old,
including the same number of ports.
Nortel Ethernet Routing Switch 4500 Series
Overview — System Configuration
NN47205-500
02.01
Standard
5.0
23 February 2007
Copyright © 2007, Nortel Networks
Nortel Networks Confidential
.
