Config loss on power bump

[narmad78]

I currently have a Cisco 9300 that I work with and on a power bump or outage it seems to lose it's config. I've gone in there with the back up config a few times to fix it up, save it and seems to go away on the next outage. Anyone have a possible idea what the cause may be and what commands may lead me to a fix.

[M02@rt37]

Hello @narmad78,

Please check config-register value.

Do #sh version and check this value.

It should be 0x2102.

If not, configure this value:

C9300#configure terminal
C9300(config)#config-register ?
<0x0-0xFFFF>  Config register number

C9300(config)#config-register 0x2102

Save run to startup.

Also, refer here: https://community.cisco.com/t5/switching/cisco-9300-losing-config-after-reloading/td-p/3769971

[Arash Emami]

Check your config register, try this link:
https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html

Or maybe the solution in this post can be helpful:
https://community.cisco.com/t5/switching/c9300-not-saving-config-after-upgrade/td-p/4753407

BR

[pieterh]

maybe an obvious remark: check the config is saved in the right place using 
     copy running-config startup-config
if you saved it on usb flash drive or tftp server check it is also loaded from there

for emergency reasons you can also write another copy on flash
      copy running-config flash:config_backup_<date>   or something
if this file is not present on flash after a reboot, something is seriously wrong with the switch

[Richard Pidcock]

Sounds like a config-register issue to me.  Check your config-register value by issuing a "show version" command.  

If your output show 0x2142 then that's your issue.  Change the value to 0x2102.

[Richard Burts]

Several responses have mentioned the possibility that the config register is causing the config to not be used when booting, and that should be the first thing to check. But if that is not the issue then take a good look at the link suggested by @Arash Emami about the 9300 and sh romvar.