Locator/ID Separation Protocol (LISP) Map-Versioning
RFC 6834

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Internet Engineering Task Force (IETF)                        L. Iannone
Request for Comments: 6834                             Telecom ParisTech
Category: Experimental                                         D. Saucez
ISSN: 2070-1721                                   INRIA Sophia Antipolis
                                                          O. Bonaventure
                                        Universite catholique de Louvain
                                                            January 2013

          Locator/ID Separation Protocol (LISP) Map-Versioning

Abstract

   This document describes the LISP (Locator/ID Separation Protocol)
   Map-Versioning mechanism, which provides in-packet information about
   Endpoint ID to Routing Locator (EID-to-RLOC) mappings used to
   encapsulate LISP data packets.  The proposed approach is based on
   associating a version number to EID-to-RLOC mappings and the
   transport of such a version number in the LISP-specific header of
   LISP-encapsulated packets.  LISP Map-Versioning is particularly
   useful to inform communicating Ingress Tunnel Routers (ITRs) and
   Egress Tunnel Routers (ETRs) about modifications of the mappings used
   to encapsulate packets.  The mechanism is transparent to
   implementations not supporting this feature, since in the LISP-
   specific header and in the Map Records, bits used for Map-Versioning
   can be safely ignored by ITRs and ETRs that do not support the
   mechanism.

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/rfc6834.

Iannone, et al.               Experimental                      [Page 1]
RFC 6834                   LISP Map-Versioning              January 2013

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
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   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Notation ...........................................4
   3. Definitions of Terms ............................................4
   4. EID-to-RLOC Map-Version Number ..................................4
      4.1. The Null Map-Version .......................................5
   5. Dealing with Map-Version Numbers ................................6
      5.1. Handling Destination Map-Version Number ....................7
      5.2. Handling Source Map-Version Number .........................9
   6. LISP Header and Map-Version Numbers ............................10
   7. Map Record and Map-Version .....................................11
   8. Benefits and Case Studies for Map-Versioning ...................12
      8.1. Map-Versioning and Unidirectional Traffic .................12
      8.2. Map-Versioning and Interworking ...........................12
           8.2.1. Map-Versioning and Proxy-ITRs ......................13
           8.2.2. Map-Versioning and LISP-NAT ........................13
           8.2.3. Map-Versioning and Proxy-ETRs ......................14
      8.3. RLOC Shutdown/Withdraw ....................................14
      8.4. Map-Version for Lightweight LISP Implementation ...........15
   9. Incremental Deployment and Implementation Status ...............15
   10. Security Considerations .......................................16
      10.1. Map-Versioning against Traffic Disruption ................16
      10.2. Map-Versioning against Reachability Information DoS ......17
   11. Open Issues and Considerations ................................17
      11.1. Lack of Synchronization among ETRs .......................17
   12. Acknowledgments ...............................................19
   13. References ....................................................19