Software Rollback Configuration Scenarios For A Single Switch - Alcatel-Lucent OmniSwitch 6850-48 Management Manual

Managing CMM Directory Content

Software Rollback Configuration Scenarios for a Single Switch

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.
Scenario 1: Running Configuration Lost After Reboot
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 the certified directory, all 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
1. Switch boots
from certified
directory by using
factory configura-
tion settings.
Since the working
and certified
directories are the
same, it will be
running from the
working direc-
tory.
Running Configuration is Overwritten by the Certified Directory on Boot
OmniSwitch AOS Release 6 Switch Management Guide
"Redundancy Scenarios" on page
R W C
2. Changes are
made to the run-
ning configura-
tion and stored in
the running con-
figuration.
September 2009
"Where is the Switch Running From?" on page 5-4
R W C
3. Power is inter-
rupted and the
switch goes down.
CMM Files
5-9.
R W C
4. Switch reboots
from certified
directory by 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.
page 5-5