This attribute specifies the current status of the writable bank. It is
set to unknown until the status is determined by the software. It
takes a few seconds at software activation time to determine the
status of the writable bank.
unknown: The switch has not yet determined the state of the
writable bank. This happens only within the first few seconds the
software is activated.
empty: No (valid) software is loaded in the writable bank.
loading: Software is currently loading into the writable bank.
loaded: The software has successfully loaded.
An example of a transition sequence for the writable bank status is:
unknown -> empty-> loading -> loaded-> loading.
On a failure, the status reverts to the previous status that was
successful. For example if the loading fails, the status returns to
empty.