Separation of Control and User Plane for Proxy Mobile IPv6
RFC 7389

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Internet Engineering Task Force (IETF)                       R. Wakikawa
Request for Comments: 7389                               Softbank Mobile
Category: Standards Track                                  R. Pazhyannur
ISSN: 2070-1721                                            S. Gundavelli
                                                                   Cisco
                                                              C. Perkins
                                                          Futurewei Inc.
                                                            October 2014

       Separation of Control and User Plane for Proxy Mobile IPv6

Abstract

   This document specifies a method to split the control plane (CP) and
   user plane (UP) for a network infrastructure based on Proxy Mobile
   IPv6 (PMIPv6).  Existing specifications allow a mobile access gateway
   (MAG) to separate its control and user plane using the Alternate
   Care-of Address mobility option for IPv6 or Alternate IPv4 Care-of
   Address option for IPv4.  However, the current specification does not
   provide any mechanism allowing the local mobility anchor (LMA) to
   perform an analogous functional split.  To remedy that shortcoming,
   this document specifies a mobility option enabling an LMA to provide
   an alternate LMA address to be used for the bidirectional user-plane
   traffic between the MAG and LMA.  With this new option, an LMA will
   be able to use an IP address for its user plane that is different
   than the IP address used for the control plane.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc7389.

Wakikawa, et al.             Standards Track                    [Page 1]
RFC 7389                   PMIPv6 CP-UP Split               October 2014

Copyright Notice

   Copyright (c) 2014 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.

Table of Contents

   1. Introduction ....................................................2
   2. Conventions and Terminology .....................................5
      2.1. Conventions ................................................5
      2.2. Terminology ................................................5
   3. Additional Fields in Conceptual Data Structures .................6
   4. LMA User-Plane Address Mobility Option ..........................6
   5. Protocol Configuration Variable .................................8
   6. IANA Considerations .............................................9
   7. Security Considerations .........................................9
   8. References .....................................................10
      8.1. Normative References ......................................10
      8.2. Informative References ....................................10
   Acknowledgements ..................................................12
   Authors' Addresses ................................................12

1.  Introduction

   A Proxy Mobile IPv6 (PMIPv6) infrastructure comprises two primary
   entities: LMA (local mobility anchor) and MAG (mobile access
   gateway).  The interface between the MAG and LMA consists of the
   control plane and user plane.  The control plane is responsible for
   signaling messages between the MAG and LMA, such as the Proxy Binding
   Update (PBU) and Proxy Binding Acknowledgement (PBA) messages to
   establish a mobility binding.  In addition, the control-plane
   components in the MAG and LMA are also responsible for setting up and
   tearing down a bidirectional tunnel between the MAG and LMA.  The
   user plane is used for carrying the mobile node's IP traffic between
   the MAG and the LMA over the bidirectional tunnel.

Wakikawa, et al.             Standards Track                    [Page 2]
RFC 7389                   PMIPv6 CP-UP Split               October 2014

   Widely deployed mobility management systems for wireless