I have several routers and switches that are at EOL that I need to declassify before I can get rid of them. Is there a standard method of insuring that all sensitive data is removed. I know that the DOD uses Cisco and must have a process. On the 3200 Routers there is a declassify command that can take care of it but I have older devices.
In a "classified" environment the hardware is pulverized and physically destroyed. Non classified hardware the NVRAM is wiped to remove all configrations, only allowing the OS to remain.
Depending on the work center a QA or outside entity would witness the wiping of the device or run checks to make sure no configuarions or identifying labels are remaining on the device.
Please see the following link to show you how to sanitize your device: