Alcatel Carrier Internetworking Solutions omniswitch User Manual

Managing CMM Directory Content

CMM Files

OmniSwitch 6600 Family Switch Management Guide

page 4-5

The examples below illustrate a few likely scenarios and explain how the running configuration, working 
directory, and certified directory interoperate to facilitate the software rollback on a single switch. 

Note. This information applies to a switch stack, however the manner in which CMM software is propa-
gated to all switches in a stack is explained in 

In the examples below, R represents the running configuration, W represents the working directory, and C 
represents the certified directory.

Note. For the following scenarios, it is important to remember the difference between where the switch 
boots from, and where the switch is running from. See 

for more information.

Switch X is new from the factory. It is plugged in and booted up from the certified directory, the contents 
of which are loaded into the running configuration. Since the working and certified directories are exactly 
the same, the switch is running from the working directory. Through the course of several days, changes 
are made to the configuration file in the running configuration. 

Power to the switch is interrupted, the switch reboots from certified directory, all of the changes in the 
running configuration are overwritten, and the switch rolls back to the certified directory (which in this 
case is the factory setting).

This is illustrated in the diagram below:

 

R

W

C

R

W

C

R

W

C

R

W

C

1. Switch boots 

from certified 

directory using 

factory configura-

tion settings. 

Since the working 

and certified 

directories are the 

same, it will be 

running from the 

working direc-

tory.

2. Changes are 

made to the run-

ning configura-

tion and stored in 

the running con-

figuration.

3. Power is inter-

rupted and the 

switch goes down.

4. Switch reboots 

from certified 

directory using 

factory configura-

tion settings; run-

ning configuration 

changes are lost. 

Since the working 

and certified direc-

tories are the same, 

it will be running 

from the working 

directory.