Interworking between Locator/ID Separation Protocol (LISP) and Non-LISP Sites
RFC 6832

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Internet Engineering Task Force (IETF)                          D. Lewis
Request for Comments: 6832                                      D. Meyer
Category: Experimental                                      D. Farinacci
ISSN: 2070-1721                                            Cisco Systems
                                                               V. Fuller
                                                            January 2013

     Interworking between Locator/ID Separation Protocol (LISP) and
                             Non-LISP Sites

Abstract

   This document describes techniques for allowing sites running the
   Locator/ID Separation Protocol (LISP) to interoperate with Internet
   sites that may be using either IPv4, IPv6, or both but that are not
   running LISP.  A fundamental property of LISP-speaking sites is that
   they use Endpoint Identifiers (EIDs), rather than traditional IP
   addresses, in the source and destination fields of all traffic they
   emit or receive.  While EIDs are syntactically identical to IPv4 or
   IPv6 addresses, normally routes to them are not carried in the global
   routing system, so an interoperability mechanism is needed for non-
   LISP-speaking sites to exchange traffic with LISP-speaking sites.
   This document introduces three such mechanisms.  The first uses a new
   network element, the LISP Proxy Ingress Tunnel Router (Proxy-ITR), to
   act as an intermediate LISP Ingress Tunnel Router (ITR) for non-LISP-
   speaking hosts.  Second, this document adds Network Address
   Translation (NAT) functionality to LISP ITRs and LISP Egress Tunnel
   Routers (ETRs) to substitute routable IP addresses for non-routable
   EIDs.  Finally, this document introduces the Proxy Egress Tunnel
   Router (Proxy-ETR) to handle cases where a LISP ITR cannot send
   packets to non-LISP sites without encapsulation.

Lewis, et al.                 Experimental                      [Page 1]
RFC 6832             LISP and Non-LISP Interworking         January 2013

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6832.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Lewis, et al.                 Experimental                      [Page 2]
RFC 6832             LISP and Non-LISP Interworking         January 2013

Table of Contents

   1. Introduction ....................................................3
   2. Definition of Terms .............................................5
   3. LISP Interworking Models ........................................6
   4. Routable EIDs ...................................................7
      4.1. Impact on Routing Table ....................................7
      4.2. Requirement for Sites to Use BGP ...........................7
      4.3. Limiting the Impact of Routable EIDs .......................7
      4.4. Use of Routable EIDs for Sites Transitioning to LISP .......7
   5. Proxy Ingress Tunnel Routers ....................................8
      5.1. Proxy-ITR EID Announcements ................................8
      5.2. Packet Flow with Proxy-ITRs ................................9
      5.3. Scaling Proxy-ITRs ........................................11
      5.4. Impact of the Proxy-ITR's Placement in the Network ........11
      5.5. Benefit to Networks Deploying Proxy-ITRs ..................11
   6. Proxy Egress Tunnel Routers ....................................12
      6.1. Packet Flow with Proxy-ETRs ...............................12
   7. LISP-NAT .......................................................13
      7.1. Using LISP-NAT with LISP-NR EIDs ..........................14