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

[Boston10G_com]

MBLake001

Thanks, 

1. config-register 0x102
2. no system ignore startupconfig

worked for me as well.  

[Mark Malone]

Thats your  issue its set to 0x142 , when you reload it does it go to 0x102 if not manually set it

[ussoldier01]

Ok I was having the same issue on 3 different 3850s I was finally able to fix it and would like to paste the fix I used here in hopes it will help others.

"show version" display config reg 0x142 (will be 0x102 at next reload)

CSCui54490

Description

Symptom:
When start-up configuration is ignored by setting ROMMON boot parameter (SWITCH_IGNORE_STARTUP_CFG) or start-up configuration is removed, the default config register value will be shown as 0x142 instead of 0x102.

C3850#show version | inc register
Configuration register is 0x142 (will be 0x102 at next reload)

Conditions:
When ROMMON boot parameter "SWITCH_IGNORE_STARTUP_CFG" is set to 1, "show version" command will not display default config register(0x102).
OR
"system ignore startupconfig switch all" configured under "config t"
This command basically sets the SWITCH_IGNORE_STARTUP_CFG to 1.
OR
"write erase" is executed and switch is booted.
Workaround:
Steps:
1. Configure "system ignore startupconfig switch all" under "config t".
2. Configure "no system ignore startupconfig switch all" under "config t".
3. Save the config
4. Reload the switch.

Once it is up, the config register should be 0x102.
C3850#show version | inc register
Configuration register is 0x102

Ref: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCui54490/?reffering_site=dumpcr

[thpmalinga]

it worked for me as well very useful command Tx Million Team

Thpm

[josephrshelton]

Worked for me too.

Almost thought I had to return a used switch because I could not save configuration changes to the startup config.

Thank yo for posting this thread.

[mipxman]

this problem maybe come from the switch before is stackwise with another switches and can not save configuration in byself. with this command

#no system ignore startupconfig  

and 

#switch 1 provision <switch model>

you can enforce to run with the local memory. 

also don t forget change the confreg  code to 0x102