3850 not keeping configuration after boot

[mblake001]

we just recieved our 3850 switches and i have one that will not reboot to the startup config. im pretty sure i can fix the problem in rommon mode but so far nothing works to get it into rommon mode. anyone have any ideas?

thanks

[Mark Malone]

whats your config register set to in show version ?

[mblake001]

This is what it shows in the config register

"Configuration register is 0x142 (will be 0x102 at next reload)"

[Richard Burts]

The 4 in 0x142 tells the device to ignore the startup config at boot time. This is why it has not seemed to retain the startup config. I suggest that you go ahead and reload. If the config register is then set to 0x102 then the startup config should work as expected.

HTH

Rick

[mblake001]

we use the command

"config-register 0x102"

that did not work

[Richard Burts]

The config-register command by itself does not fix it. After executing the command you must reload for the problem to be fixed.

HTH

Rick

[mblake001]

i did

Commands:

config-register 0x104

exit

reload.

this did not fix it.

also tried :

config-register 0x0

exit

reload

to get into rommon, didnt work either

[vivek srivastava]

Have u tried below:

Conf t

config-register 0x102

end

wr

reload.

[mblake001]

tried that, still didnt work

[mblake001]

This is what worked

#config-register 0x102

#no system ignore startupconfig

[Richard Burts]

Glad to know that you got it solved. Thank you for posting back to the forum to let us know how you fixed it. I have not seen that command before and it is interesting to know that it exists.

HTH

Rick

[ansounda]

Thank you! I've been stuck in this state for more than an hour and this was helpful!

[fadfo]

Fantastic. It worked for me! Thank you.

[MU_B]

I had a same issue and this commands work, Model:3850, (IOS Version 16.3.6)

#config-register 0x102

#no system ignore startupconfig switch all

or

#no system ignore startupconfig switch <1-9>

[Balaji Rajan]

very useful resolution. Thanks for sharing in the community.

Not sure this is something to do where we want to reuse a stacked switch as a standalone switch - a first-time issue faced while making a switch as a standalone switch.

(config)#no switch 1 provision ws-xxxxx
(config)#end
#switch 2 renumber 1
#wr

#reload

After configuring the switch and reload - system back to Config-reg 0x142 and though I could see the config in the startup file in nvram. Then did the following and reloaded.

(config)#config-register 0x102

(config)#no system ignore startupconfig switch all

(config)# Hostname SW1

(config)#end
#wr

#reload

#reload