LUDB and RADIUS access can be combined during subscriber-host instantiation phase.
Configuration-wise, LUDB must be referenced under the group-interface>dhcp/ppp/pppoe hierarchy (and possibly under the capture SAP), while the authentication-policy is specified within the LUDB. In this fashion, LUDB access is followed by RADIUS access. The subscriber-host parameters retrieved from both sources are combined with LUDB parameters being prioritized over RADIUS parameters in case that both sources return the same parameters.
If LUDB and authentication policy are configured simultaneously under the group-interface (and possibly under the capture SAP), the RADIUS authentication policy evaluates and LUDB is ignored.