Nn47215-500 (323162-B) 02.02 Standard; Nortel Ethernet Routing Switch 2500 Series - Nortel 2500 Series System Configuration Manual

56 Nortel Ethernet Routing Switch 2500 Series stacking
CFG mirror image process
The CFG mirror image process is triggered by specific events.
Power Cycle After a power cycle, all the CFG images in a stack are
mirrored.
Figure 15 "CFG mirror process in stack" (page 56)
images in a three-unit stack after the stack is powered on. Unit 1 is the
Based Unit (BU) and all other units are Non-Based Units (NBU).
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Figure 15
CFG mirror process in stack
Copyright © 2007, Nortel Networks
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Unit 1 (BU) contains mirror images for unit 2 (CFG 2) and unit 3 (CFG 3).
Unit 2 (NBU), is the TEMP-BU. It contains a mirror image of unit 1 (CFG
1), in case the BU (unit 1) is removed from the stack.
All three mirror images (CFG 1, CFG 2, and CFG 3) are active.
Unit 2 is the Associated Unit of the CFG 2 mirror image.
The Mac Address 2 is the Associated Mac Address (AMA) of the CFG
2 mirror image.

Nortel Ethernet Routing Switch 2500 Series

Overview — System Configuration

NN47215-500 (323162-B) 02.02 Standard

4.1 19 November 2007
illustrates the CFG mirror