Cisco WS-3850-24T-S

[kzahoor]

Hi,

 I have above switch which I have tried to update from 16.3.1 and I have took it to 16.3.6 but not without a struggle.

At first, it completely failed to boot even after telling me that firmware upgrade was successful.

I have managed to use usb with image on it to get it going.

I also had to point boot variable to packages.conf as it wasn't loading the full package.

On support website, I can see there is Gibraltar 16.12.07 available to install.

Am I correct in thinking I can install this without destroying it again? or do I need to be careful about it ?

[marce1000]

 - If you are unsure of outcome , then copy running-config to external repository first with scp or  tftp, in worst case, factory reset, upgrade on virgin device then you can (still) restore config.

 M.

[kzahoor]

thanks.

I am not really bothered about config though I do have a backup of the config.

it won't kill the device if firmware upgrade fails ? thats what I want to know.

also, would that be correct latest version >> https://software.cisco.com/download/home/284455425/type/282046477/release/Gibraltar-16.12.7

regards

[marce1000]

 - Firmware upgrade won't kill the device , when done correctly and or  always best to study release notes of intended version ,  yes link is latest advisory release which is the best to install.

 M.

[kzahoor]

thanks.

whats the best procedure to install I have used below previously

++ upload the firmware using tftp or usb to flash

++ then boot flash: name of BIN file

I have also used request platform software package install switch all file flash:BIN file

[Leo Laohoo · Accepted solution]

If this is for "personal" use, do not even make any attempt to upgrade to 16.9.X (and later). 

Stick to 3.6.X, 3.7.X, 16.3.X or 16.6.X.  

Cisco 3850: IOS-XE/Firmware Upgrade

[kzahoor]

thanks @Leo Laohoo  the link you have provided is pretty comprehensive.

Yes its for personal use. I may take it up to 16.6.9

One question, where do I get the SMU file from if I need to go down that route ?

[Leo Laohoo]

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@kzahoor wrote:

where do I get the SMU file from if I need to go down that route ?

---

Do not install SMU unless you hit the bugs.  
Take it from someone who's been "beta testing" Cisco firmware since 2010, SMU usually introduce more bugs than fixing them.

[kzahoor]

thanks for that.

an update for 16.6.9, everything works however I am unable to login to WebUi after short amount of time. serial / ssh works fine still

WebUI just says invalid creds. is that a buggy web ui or something else.

[Leo Laohoo]

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@kzahoor wrote:

WebUI just says invalid creds. is that a buggy web ui or something else.

---

No, that means HTTP is not configured correctly.

[kzahoor]

so why would it work upon first login and then fail to login on subsequent attempt fail unless i restart the http server again ?

[Leo Laohoo]

What firmware is the switch on?

[kzahoor]

16.6.9

[kzahoor]

further update, I have managed to upgrade to 16.6.9 without any problems. just going to follow the other thread for my 3750G switch

I can login if i shut down and restart http secure-server