This enumerated value reports whether this unit's ID was assigned automatically by the fabric's numbering algorithm or manually by an administrator setting hh3cFtmUnitID. Admins check it to understand whether a unit's current ID is stable and manually pinned, or subject to change under the automatic numbering algorithm, for example after stack topology changes. A returned value of manual(1) confirms this unit's ID was explicitly assigned by an administrator rather than chosen automatically by the fabric.