OK here's a few.
If remote upgrade fails you could lose connectivity to your switch which you can only revoer on-site cos you might be in rommon mode might need to do a serial transfer to update.
If you choose the wrong IOS - bad idea. But the switch wii usually complain and not let you.
If you get a power cut during the update process it could render the switch useless (unlikely but you never know).
If you don't have enough flash free for the IOS you are uploading the switch will complain anyway. Workaround - delete the current IOS and upload the new. Of course if you delete the current IOS and reboot - you have no flash image to load - back to onsite serial transfer to recover from that.
The new IOS might change some of the default option i.e. something that might be automatically turned off in X might be on in Y. That could change the config (unlikely but depends if you are upgrading major versions or just releases).
Make sure, if you use "boot system" commands that you add the new IOS or change the exisiting (it's better to add to begin with because if one fais it will move on tto the next one). Of course if you have enough flash for various images, you need to make sure they are in the right order.
You could of course use this to your advantage and you'll get to travel all over europe (or get sacked ).
Regards,
Ian
