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====== Notes on Cisco Enterprise Switches ======

===== Clear the Configuration =====

http://www.cisco.com/en/US/products/hw/switches/ps607/products_tech_note09186a00800c4546.shtml

==== CatOS ====

  - Log into your switch, and enter the privileged EXEC mode by entering ''enable'' plus the enable password.
  - Enter ''clear config'' all to reset the entire system.
 
You don't need to reload the switch because processing the command wipes the switch. If you've set a boot option, you need to change that option using the ''set boot'' command.

==== IOS ====

If your switch runs Cisco IOS, it maintains a running configuration file and a startup configuration file, both of which you need to clear. Follow these steps:

  - Log into your switch, and enter the privileged EXEC mode by entering ''enable'' plus the enable password.
  - Enter ''write erase'', which erases the NVRAM file system and removes all files.  At the prompt, confirm that you want to erase all files.
  - Enter ''reload'', and enter ''no'' when prompted to save the configuration. (Otherwise, the switch will reload the current running configuration.)
  - Confirm that you want to reload the switch, and your switch configuration is almost clean.

It's almost clean, but not quite. Most people forget to clear any VLAN information they've created for their switches. Depending on the hardware version of your switch and the software version of your OS, the command for this varies.

<file>
show vlan

dir flash:

dir cat4000_flash:

dir const_nvram:

delete flash:vlan.dat

erase cat4000_flash:

reload
</file>

===== Upgrade Firmware =====

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00801347e2.shtml

http://code.google.com/p/tftpgui/

:!: Connect to the switch's serial console port.

:!: Configure the networking so the switch can communicate to a TFTP server.

Start by entering EXEC mode:

<file>
enable
</file>

Make room for the new firmware image, if necessary:

<file>
dir bootflash:

delete bootflash:<old-image-file-name>

squeeze bootflash:
</file>

Download the file to the switch:

<file>
copy tftp: bootflash:

Address or name of remote host []? <ip-addr-of-tftp-server>
Source filename []? <new-image-file-name> 
Destination filename [flash]? <new-image-file-name>
</file>

==== Configure the Switch to Boot the New Image ====

Determine the current boot statement that you want to remove:

<file>
show bootvar

show config
</file>

To remove the ''boot system flash'' statement, enter into ''configuration terminal'' mode:

<file>
configure terminal

no boot system flash bootflash:<old-image-file-name>

<ctrl-z)

write memory
</file>

Set the new boot statement:

<file>
configure terminal

boot system flash bootflash:<new-image-file-name>

<ctrl-z)

write memory
</file>

Verify and reboot the switch:

<file>
show bootvar

reload
</file>

Verify the new system image:

<file>
show version
</file>

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml

Verify this in the output:

<file>
Configuration register is 0x2102
</file>
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