ONTAP 9 Manuals ( CA08871-402 )

Although local users can be members of different local groups, local groups cannot be members of other local groups. The local user access token is composed of a union of all privileges assigned to groups to which a particular local user is a member.

When a domain user logs in, ONTAP obtains a user access token that contains the user SID and SIDs for all the domain groups to which the user is a member. ONTAP uses the union of the domain user access token with the access token provided by local memberships of the user’s domain groups (if any), as well as any direct privileges assigned to the domain user or any of its domain group memberships.