Logical-host ids are defined and SPs associated with them using the Vantage Configuration Utility, referred to in Teradata Vantage™ - Database Utilities, B035-1102. The Host Type Designator is always 'IBM'. In that document, SPs are referred to as PEs.
CPs and NPs are associated with a Logical-host using the Parallel Upgrade Tool. For information, see Parallel Upgrade Tool (PUT) Reference, B035-5716.
When multiple database systems have Logical-host ids with CPs or NPs accessed by TDPs in the same operating system image, all these Logical-host ids must be unique.