The LISP Mapping System
In the Locator/Identifier Separation Protocol the network elements (routers) are responsible for looking up the mapping between end-point-identifiers (EID) and route locators (RLOC) and this process is invisible to the Internet end-hosts. The mappings are stored in a distributed database called the mapping system, which responds to the lookup queries. The LISP beta network initially used a BGP-based mapping system called LISP ALternative Topology (LISP+ALT), but this has now been replaced by a DNS-like indexing system called DDT inspired from LISP-TREE. The protocol design made it easy to plug in a new mapping system, when a different design proved to have benefits. Some proposals have already emerged and have been compared.
Read more about this topic: Locator/Identifier Separation Protocol
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