Same thing for local or system install
NSO 4.1.1 Administration Guide/The AAA Infrastructure/Authentication
PAM section for Linux and you are able to use the same users/groups defined in Linux
External Authentication section to understand better how to use something like LDAP/RADIUS/TACACS+
I’ve been through this recently, there are multiple threads on the mailer discussing External Authentication, there is also an LDAP example on devnet Best Practices
I hope this helps!