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Managing CMM Directory Content CMM Files

OmniSwitch 6250/6450 Switch Management Guide May 2012 page 5-5

Software Rollback Configuration Scenarios for a Single Switch

The following examples illustrate a few likely scenarios and explain how the running configuration, work-

ing 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 5-9.

In the following examples, 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 5-4

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 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 following diagram:

Running Configuration is Overwritten by the Certified Directory on Boot

RWC

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.

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 by using

factory configura-

tion settings; run-

ning configuration

changes are lost.

Since the working

and certified direc-

tories are the same,

it runs from the

working directory.

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