IPv4 Traffic Offload Selector Option for Proxy Mobile IPv6
RFC 6909

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Internet Engineering Task Force (IETF)                S. Gundavelli, Ed.
Request for Comments: 6909                                         Cisco
Category: Standards Track                                        X. Zhou
ISSN: 2070-1721                                          ZTE Corporation
                                                             J. Korhonen
                                                          Renesas Mobile
                                                                G. Feige
                                                               R. Koodli
                                                                   Cisco
                                                              April 2013

       IPv4 Traffic Offload Selector Option for Proxy Mobile IPv6

Abstract

   This specification defines a new mobility option, the IPv4 Traffic
   Offload Selector option, for Proxy Mobile IPv6.  This option can be
   used by the local mobility anchor and the mobile access gateway for
   negotiating IPv4 traffic offload policy for a mobility session.
   Based on the negotiated IPv4 traffic offload policy, a mobile access
   gateway can selectively offload some of the IPv4 traffic flows in the
   access network instead of tunneling back to the local mobility anchor
   in the home network.

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/rfc6909.

Gundavelli, et al.           Standards Track                    [Page 1]
RFC 6909          IPv4 Traffic Offload Selector Option        April 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
   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 .....................................4
      2.1. Conventions ................................................4
      2.2. Terminology ................................................4
   3. Solution Overview ...............................................4
      3.1. IPv4 Traffic Offload Selector Option .......................6
      3.2. MAG Considerations .........................................8
      3.3. LMA Considerations .........................................9
   4. Protocol Configuration Variables ...............................11
   5. IANA Considerations ............................................11
   6. Security Considerations ........................................12
   7. Acknowledgements ...............................................12
   8. References .....................................................13
      8.1. Normative References ......................................13
      8.2. Informative References ....................................13

1.  Introduction

   Mobile operators are expanding their network coverage by integrating
   various access technology domains (e.g., Wireless LAN, CDMA, and
   Long-Term Evolution (LTE)) into a common IP mobility core.  The Third
   Generation Partnership Project (3GPP) S2a Proxy Mobile IPv6 [TS23402]
   reference point, specified by the 3GPP system architecture, defines
   the protocol interworking for building such integrated multi-access
   networks.  In this scenario, the mobile node's IP traffic is always
   tunneled back from the mobile access gateway [RFC5213] in the access
   network to the local mobility anchor in the home network.  Currently,
   there is no mechanism for allowing some of the subscriber's IP flows
   to be offloaded in the access network.

Gundavelli, et al.           Standards Track                    [Page 2]
RFC 6909          IPv4 Traffic Offload Selector Option        April 2013

   With the exponential growth in mobile data traffic, mobile operators
   are exploring new ways to offload some of the IP traffic flows at the
   nearest access edge.  The offload is intended either for local