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Performing an IOS upgrade on a switch

Before performing an upgrade, perform a copy running-config startup-config
Then perform a reload to verify that the switch comes up normally before the upgrade.  This way if there are problems after the upgrade, you can be sure it's not the configuration.
Verify the device your upgrading has enough memory on the flash drive.  This is done by typing:
dir flash:
copy tftp: flash:
Enter the IP address of the TFTP server
Enter the name of the file to upload.  (i.e. "c3560e-universalk9-mz.122-50.SE1.bin")
Exclamation marks should appear for every successful packet that's received during the TFTP.
config t
boot system flash:c3560e-universalk9-mz.122-50.SE1.bin