Lisp support
    draft-ietf-lisp-01.txt
    draft-ietf-lisp-alt-01.txt   (<<< Why need GRE ????)
    draft-ietf-lisp-interworking-00.txt
    draft-ietf-lisp-ms-01.txt
    draft-farinacci-lisp-lig-00.txt

Support LISP for both IPv4 and IPv6
    ITR, ETR and PTR (proxy tunnel router)   (<<< How PTR positions ?)
    LISP-NAT for IPv4 only
    ALT-router, MAP-Resolver and Map-Server

Code Effort
    IOS implementation  -  Loc/ID split functionality
    IOX implementation  - TE-ITR / TR-ETR functionality

LISP Deployment
    LISP-ALT Infrastructure
        GRE tunnels numbered out of 240.0.0.0/4
        LISP-ALT uses 32-bit AS numbers, format is 32656.X (AS not notation)
        EID-prefixes BGP advertised from "lisp" VRF
        RLOCs in default VRF

Mapping Database Design
    ALT - hybrid push/pull
          push EID-prefixes using BGP on alternate topology of GRE tunnels
          pull mappings

Service Interface for the Mapping Database
     ETRs register site RID-prefixes with MAP-Servers
     ETRs (at the site) are authoritative for their own database mappings
     When ALT is used, Map-Servers advertise EID-prefixes

What is LISP-ALT ?
     Advertise EID-prefixes in BGP on an alternate topolofy of GRE
     An ALT Device is:
           xTRs configured with GRE tunnels
           Map-Servers
           Map-Resolvers
           Pure ALT-only router for aggregating other ALT peering connections
      An ALT-only device can be off-the-shelf gear:
           Rouer hardwre
           Linux host
           Just needs to run BGP and GRE

Mapping Entry
      EID-prefix / Locator-set

Two Basic Techniques
      LISP Network Address Translation (LISP-NAT)
      Proxy Tunnel Routers (PTRs)

LISP Data-Plane
      Encapsulation and router placement
      Locator reachability
      Data-triggered mapping service (Map-request, Map-Reply, Map-Register)

LISP Control-Plane
      Definition for "mapping cache" and "mapping database"
            mapping database - stored in all ETRs of each LISP site
            mapping cache - entries obtained and stored in ITRs for the sites sending packets to
      Modular scalable mapping service
      ALT
      Map-Servers and Map-Resolvers
      User tools for querying the mapping database

PI address - Private IP address (10.0.0.0/8,  172.16.0.0/12,  192.168.0.0/16)
PA address - Public address