3850 Stack IOS not staying on reboot

david.klein · ‎02-21-2018

I have followed these instructions:

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

When a reboot is done, only one switch stays with the correct updated IOS.

The other switch only comes up with "switch" prompt and I need to run command :

boot flash:packages.config , then the switch boots back up and is in stack.

While switch that will not boot correctly is sitting at "switch:" prompt, the other switch which booted correctly shows this when I issue command "show switch"

Switch#   Role    Mac Address     Priority Version State
------------------------------------------------------------
*1       Active   cc98.91e6.2c80     15     V06     Ready
2       Member   0000.0000.0000     0      0       Provisioned

If I power off switches again, only one comes up properly, and same thing happens all over again.

Philip D'Ath · ‎02-21-2018

The default config register for a 3850 is 0x102. Check that setting.

Anything interesting appear in the log when it fails to boot up?

david.klein · ‎02-22-2018

I will need to console in and check what I see in the logs.

Thanks for the reply