If a set operation on EVB-MIB-tables returns success, this object
indicates the actual result of this operation. Otherwise, it is
meaningless.
unknown: The set operation on the node has been completed, but the
result could only be got from the table which the set
operation happended.
processing: The set operation is in process. Another set operation
cannot be performed at this time.
success: The set operation has succeeded.
failed: The set operation has failed.