This draft describes the LISP Delegated Database Tree (LISP-DDT), a
hierarchical, distributed database which embodies the delegation of
authority to provide mappings from LISP Endpoint Identifiers (EIDs)
to Routing Locators (RLOCs). It is a statically-defined distribution
of the EID namespace among a set of LISP-speaking servers, called DDT
nodes. Each DDT node is configured as "authoritative" for one or
more EID-prefixes, along with the set of RLOCs for Map Servers or
"child" DDT nodes to which more-specific EID-prefixes are delegated.