I have change some configuration parameter on catalyst 1900 switch after reboot or reload some switch has lost the configuration I have changed. If I'm remember correctly, it exist 2 types of mode on this switch series.
The first type and the default : when configuration it's automaticly save in the NVRAM, it's not necessaily to issue "write memory" or anything else like that.
The second is like the more recent switch like Catalyst 2960, where we have to save configuration before shutdown the switch if configuration must be retain.
1- I would like to know how can I confirm in which of this mode my switch is running.
2- How can I switch between those 2 types
3- How can I make sure my configuration is save before reload, when my switch is running in the none default type ( I already tried "write mem" and "copy run start" command, no wriet command exist, and for the copy command the only parameter is TFTP....
If Catalyst switch is running CATOS image, you don't need to save config change. System will do it automatically.
It looks like your switch is running IOS. In that case, you have to use "wr mem" or "copy run start" to save any config change.
After you save any config change, you can use "show start" to confirm if the change has been saved correctly. When reloading the switch, capture console output to see if there is any message to indicate why the new config is not taken by system.
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