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Cisco IOS upgrades

Posted on 2011-09-29
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Last Modified: 2012-06-27
Hi,

I've looked over this site regarding upgrading IOS.

This tells me how to work through an upgrade with some precautions?

What happens if it fails though? This is a remote site, what can I do?

Can we reload remotely if the switch upgrade fails and the device dies?
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Question by:codevu
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Soulja earned 1000 total points
ID: 36815631
Use the archive feature. It one complete the process or remove the previous IOS unless it succeeds.

so for example on the remote switch

archive download-sw /overwrite /force-reload tftp://x.x.x.x/filename.tar
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Expert Comment

by:Soulja
ID: 36815646
I meant, it won't remove the previous IOS unless it completely succeeds.
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Author Comment

by:codevu
ID: 36815720
Soulja, that sounds interesting, I will need to check over archive.

If I don't use archive and run an upgrade remotely what happens it fails after a reboot? Am I able to restore remotely?
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LVL 26

Expert Comment

by:Soulja
ID: 36815812
If it fails after a reboot you will not be able to access the device remotely, unless you have some out of band method of access the switch such as reverse telnet or ssh from your router into the switch's console port.
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LVL 26

Expert Comment

by:Soulja
ID: 36815822
I would do the archive method. I have upgraded plenty of devices remotely with this method, even over 128k links. Never failed for me. Not saying that it can't but seems like a solid method to me.
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Author Comment

by:codevu
ID: 36815896
Yeah, I was concerned I would lose remote access if it went down on reboot.

So, to confirm, the command sample you gave me will initiate the upgrade, run it and then try to reboot. If all is well I am happy. If it fails, it detects this and restores previous? (from ftp or from flash?)

Thanks
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LVL 26

Expert Comment

by:Soulja
ID: 36815956
Yes the archive will only overwrite the previous ios if it is successful.  Otherwise it will fail and bump you back to the prompt.
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Author Comment

by:codevu
ID: 36816029
Sorry,

So is this archive command simply to backup up the configuration? or does it physically run an update from a config I file I state and restore on fail?

I am looking for some form of resiliance/autorecovery during an upgrade if at all possible? otherwise I could face a long drive to sites if I have to get to a prompt.
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LVL 26

Expert Comment

by:Soulja
ID: 36816103
This command I posted will upgrade your switch.
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Author Closing Comment

by:codevu
ID: 36817059
Excellent feedback with supporting info and advice when requested
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