Backing up your current configuration and image

Procedure

Save your current configuration (Config1) to backup configuration file (Config2).

Before copying the config, verify the current state of your system using the show version, show flash and show config files commands. For example:

Switch1# show version
Image stamp:   /sw/code/build/btm(t4a)
               Nov 6 2009 13:20:26
               K.14.47
               188
Boot Image:    Primary

Switch1# show flash
Image           Size(Bytes)   Date    Version
------          -----------  -------  -------
Primary Image   : 9839140    11/06/09 K.14.47
Secondary Image : 0
Boot Rom Version: K.12.20
Default Boot    : Primary

Switch1# show config files

Configuration files:

 id | act pri sec | name
 ---+-------------+-----------------------------
  1 | *    *   *  | config1
  2 |             | 
  3 |             |

Create a backup configuration file and verify the change.

Switch1# copy config config1 config config2
Switch1# show config files

Configuration files:

 id | act pri sec | name
 ---+-------------+-----------------------------
  1 | *    *   *  | config1
  2 |             | config2
  3 |             |

Save the current config to a tftp server using the copy tftp command. For example:
```
Switch1# copy startup-config tftp 10.1.1.60
Switch1_config_K_14_47.cfg
```
NOTE:
This step is necessary because switches do not support roll back (going from a newer software version to an older software version) without the ability to copy a backup config file onto the device.

Back up your current running image (primary) to the secondary image.

Switch1# copy flash flash secondary

Switch1# show flash
Image           Size(Bytes)   Date    Version
------          -----------  -------  -------
Primary Image   :  9839140   11/06/09 K.14.47
Secondary Image :  9839140   11/06/09 K.14.47
Boot Rom Version: K.12.20
Default Boot    : Primary

Set your secondary image to boot with Config2.
```
Switch1# startup-default secondary config config2 

Switch1# show config files

Configuration files:

 id | act pri sec | name
 ---+-------------+-----------------------------
  1 | *    *      | config1
  2 |          *  | config2
  3 |             | 
```
This step will enable you to revert from the new software version to your previous software version (K.14.47 in the examples shown in steps 1 through 3) with your previous configuration just by invoking the command boot system flash secondary.