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OmniSwitch 6600 Family Switch Management Guide March 2005 page 4-5
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 “Redundancy Scenarios” on page 4-9.
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 “Where is the Switch Running From?” on page 4-4
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 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:
Running Configuration is Overwritten by the Certified Directory on Boot
RWC
RWC
RWC
RWC
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.