At some point on a 2950-48 switch I have the "env_vars" file was erased. I'm wondering how important to the system it is to have this file. I know the BAUD and BOOT commands are valid for certain tasks but what about MAC_ADDRESS and the SERIAL_NUMBER and all those? Are they just fluff? If I do need them on there is there a command to restore them from the switch ROM?
My personal experience is that if this file is erased, the IOS will recreate it as needed and no damage is done to the switch. A guide for password recovery on Aironet devices even suggests deleting that file when performing the password recovery. So, I would not be concerned too much about it.
Still, it is good to know which settings are stored in that file and to reenter them in the configuration mode if some of them are necessary for your switch to boot up successfully. The list of individual environment variables for the 2950 switch can be found here:
It is not necessary to rebuild the env_vars file. It only has a copy of the system specific information that is held in other flash sectors as well. The only information that you have really lost is any setting done by "boot" configuration command. That can be reset by issuing the appropriate boot command.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.