This indicates how many levels up the UCS organizational hierarchy the policy governing this object was actually defined at, versus where it's applied. It represents one specific MAC address that UCS Manager has learned or pinned on a particular vNIC/vHBA or adapter port, and it's the record UCS Manager checks before letting that interface send a frame with a different source MAC than the one assigned to it. A value of 0 means the policy is defined locally at the object's own org; a higher number means it was inherited from a parent org several levels up, which matters when an admin is trying to find where a setting actually came from.