C3850 stack ios upgrade

[tianwen.zhao]

Hi everyone,

We have  three C3850 which in stack，and we need to upgrade the IOS version.

Switch Ports Model SW Version SW Image Mode
------ ----- ----- ---------- ---------- ----
* 1 16 WS-C3850-12XS 03.07.04.E cat3k_caa-universalk9 BUNDLE
2 32 WS-C3850-24S 03.07.04.E cat3k_caa-universalk9 BUNDLE
3 56 WS-C3850-48T 03.07.04.E cat3k_caa-universalk9 BUNDLE

I want to upgrade the IOS from 03.07.04.E to 16.03.06 and I have already download the IOS file cat3k_caa-universalk9.16.03.06.SPA.bin

I haven't done the C3850 stack IOS upgrade before 

I have read relevant documentation, Here are my steps:

1.copy the image from tftp server to active switch

2.copy image to the flash of each switch 

copy flash-1: cat3k_caa-universalk9.16.03.06.SPA.bin flash-2: 

copy flash-1: cat3k_caa-universalk9.16.03.06.SPA.bin flash-3: 

3.no boot system flash 

boot system switch all flash:cat3k_caa-universalk9.16.03.06.SPA.bin

4.reload

Is it right?

Regards

[balaji.bandi]

1. Correct this

* 1 16 WS-C3850-12XS 03.07.04.E cat3k_caa-universalk9 BUNDLE  <-- you need to have INSTALL Mode.

2. Look at the release notes

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3650/software/release/16-3/release_notes/ol-16-3-3650.html

3. Look at the upgrade guide :

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/117552-technote-cat3850-00.html

Note  :Unfortunately you will need to reboot after the upgrade. So there is no way yu can do it non disruptively here.

other quick method you mentioned can be done in easy menthod, i better do it proper install proceedure, so you will if any fail happends, the install proceedure stops, and no service interuption..here is trimmed steps for your reference.

Options2 :

Reduce the time yu take to upgrade, just load the new image to a USB and then copy it to the switch via the command
3850#copy usbflash0:[image name] flash:
And repeat the same command for the second switch
3850#copy usbflash0:[image name] flash2:
Once done change the boot system to the newly uploaded image
3850(config)# boot syst switch all flash:[image name]

3850#reload  - Then finally reload....

Connect the console cable and capture any obnormal logs.

[Seb Rupik · Accepted solution]

Yes. Once booted follow these steps to move to INSTALL mode:

software clean file flash:
software expand file flash:cat3k_caa-universalk9.16.03.06.SPA.bin

conf t
!
no boot system
boot system flash: packages.conf
!
end

wr mem

reload

cheers,

Seb.

[MUHAMMAD TAYYAB MUNIR]

Hi @tianwen.zhao

Here you go :)

https://community.cisco.com/t5/networking-documents/ios-upgrade-on-cisco-3850-switches/ta-p/3790135

BR

Tayyab

[Georg Pauwen]

Hello,

on a side note, I think that Fuji 16.9.2 supports ISSU (In Service Software Upgrade), which would be non disruptive...