The IAB's October 2006 Routing and Addressing Workshop (RFC 4984)
  rekindled interest in scalable routing and addressing architectures for
  the Internet. Among the many issues driving this renewed interest are
  concerns about the scalability of the routing system. Since the IAB
  workshop, several proposals have emerged which attempt to address the
  concerns expressed there and elsewhere. In general, these proposals are
  based on the "locator/identifier separation".
  
  The basic idea behind the separation is that the Internet architecture
  combines two functions, routing locators, (where you are attached to the
  network) and identifiers (who you are) in one number space: The IP
  address. Proponents of the separation architecture postulate that
  splitting these functions apart will yield several advantages, including
  improved scalability for the routing system. The separation aims to
  decouple locators and identifiers, thus allowing for efficient
  aggregation of the routing locator space and providing persistent
  identifiers in the identifier space.
  
  A number of approaches are being looked at in parallel in other
  contexts. The IRTF RRG examined several proposals, some of which were
  published as IRTF-track Experimental RFCs.
  
  The LISP WG has completed the first set of Experimental RFCs
  describing the Locator/ID Separation Protocol. LISP requires no
  changes to end-systems or to routers that do not directly participate
  in the LISP deployment. LISP aims for an incrementally deployable
  protocol.
  
  The LISP WG is chartered to continue work on the LISP base protocol, completing
  the ongoing work, and any items which directly impact LISP protocol
  structures and which are related to using LISP for improving Internet routing
  scalability. Specifically, the group will work on:
  
  - Architecture description: This document will describe the
  architecture of the entire LISP system, making it easier to read the
  rest of the LISP specifications and providing a basis for discussion
  about the details of the LISP protocols. The document will include
  a description of the cache management and ETR synchronization
  essential characteristics needed to ensure the correct operation
  of the protocol.
  
  - Deployment models: This document will describe what kind of
  deployments can be expected for LISP, and give operational advice on
  how they can be set up.
  
  - A description of the impacts of LISP: This document will describe
  the problems that LISP is intended to address and the impacts that
  employing LISP has. While the work on LISP was initiated by Internet
  routing scaling concerns, there has also been an interest on
  improved solutions to a number of different problems, such as
  traffic engineering. This document should describe problem areas
  (such as scaling or traffic engineer) where LISP is expected to have
  a positive effect, as well as any tradeoffs that are caused by
  LISP's design.
  
  - LISP security threats and solutions: This document will describe the
  security analysis of the LISP system, what issues it needs to
  protect against, and a solution that helps defend against those
  issues. The replay attack problem discussed on the mailing list
  should be included in this work.
  
  - Allocation of Endpoint IDentifier (EID) space: This document
  requests address space to be used for the LISP experiment as
  identifier space
  
  - Alternate mapping system designs: Develop alternative mapping
  designs to be tested.
  
  - Data models for management of LISP.
  
  The first three items (architecture, deployment models, impacts) need
  to be completed first before other items can be submitted as RFCs. The
  three first documents also need to complement each other, by
  describing how the architecture supports a solution for a particular
  problem area and how the solution can be deployed to help with that
  problem.
  
  In addition, if work chartered in some other IETF WG requires changes
  in the LISP base protocol or any items which directly impact LISP
  protocol structures, then the LISP WG is chartered to work on such
  changes.
  
  It is expected that the results of specifying, implementing, and testing
  LISP will be fed to the general efforts at the IETF and IRTF to
  understand which type of a solution is optimal. The LISP WG is not
  chartered to develop a standard solution for solving the routing
  scalability problem at this time. The specifications developed by the WG
  are Experimental and labeled with accurate disclaimers about their
  limitations and not fully understood implications for Internet traffic.
  In addition, as these issues are understood, the working group will
  analyze and document the implications of LISP on Internet traffic,
  applications, routers, and security.