Generic Routing Encapsulation (GRE) Key Option for Proxy Mobile IPv6
RFC 5845

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Internet Engineering Task Force (IETF)                        A. Muhanna
Request for Comments: 5845                                     M. Khalil
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                            S. Gundavelli
                                                                K. Leung
                                                                   Cisco
                                                               June 2010

  Generic Routing Encapsulation (GRE) Key Option for Proxy Mobile IPv6

Abstract

   This specification defines a new mobility option for allowing the
   mobile access gateway and the local mobility anchor to negotiate
   Generic Routing Encapsulation (GRE) encapsulation mode and exchange
   the downlink and uplink GRE keys that are used for marking the
   downlink and uplink traffic that belong to a specific mobility
   session.  In addition, the same mobility option can be used to
   negotiate the GRE encapsulation mode without exchanging the GRE keys.

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/rfc5845.

Copyright Notice

   Copyright (c) 2010 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

Muhanna, et al.              Standards Track                    [Page 1]
RFC 5845             GRE Key Option for Proxy MIPv6            June 2010

   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 . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions and Terminology  . . . . . . . . . . . . . . . . .  3
     2.1.  Conventions  . . . . . . . . . . . . . . . . . . . . . . .  3
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  GRE Encapsulation and Key Exchange . . . . . . . . . . . . . .  4
     3.1.  GRE Encapsulation Overview . . . . . . . . . . . . . . . .  4
     3.2.  GRE Encapsulation Mode Only  . . . . . . . . . . . . . . .  6
     3.3.  GRE Encapsulation and Key Exchange . . . . . . . . . . . .  6
       3.3.1.  Initial GRE Key Exchange . . . . . . . . . . . . . . .  6
       3.3.2.  GRE Key Exchange during Binding Re-Registration  . . .  7
   4.  Mobile Access Gateway Considerations . . . . . . . . . . . . .  8
     4.1.  Extensions to the Conceptual Data Structure  . . . . . . .  8
     4.2.  Operational Summary  . . . . . . . . . . . . . . . . . . .  9
   5.  Local Mobility Anchor Considerations . . . . . . . . . . . . . 10
     5.1.  Extensions to the Binding Cache Entry  . . . . . . . . . . 10
     5.2.  Operational Summary  . . . . . . . . . . . . . . . . . . . 11
   6.  Message Formats  . . . . . . . . . . . . . . . . . . . . . . . 12
     6.1.  GRE Key Option . . . . . . . . . . . . . . . . . . . . . . 12
     6.2.  Proxy Binding Update Message Extension . . . . . . . . . . 13
     6.3.  Proxy Binding Acknowledgement Message Extension  . . . . . 14
     6.4.  Status Codes . . . . . . . . . . . . . . . . . . . . . . . 14
   7.  Data Packets Processing Considerations . . . . . . . . . . . . 15
     7.1.  Tunneling Format . . . . . . . . . . . . . . . . . . . . . 15
     7.2.  TLV-Header Tunneling Negotiation . . . . . . . . . . . . . 16
     7.3.  Mobile Access Gateway Operation  . . . . . . . . . . . . . 18
       7.3.1.  Sending and Receiving Data Packets . . . . . . . . . . 18
     7.4.  Local Mobility Anchor Operation  . . . . . . . . . . . . . 19
       7.4.1.  Sending and Receiving Data Packets . . . . . . . . . . 20
   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 21
   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 21
   10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 21
   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     11.1. Normative References . . . . . . . . . . . . . . . . . . . 22
     11.2. Informative References . . . . . . . . . . . . . . . . . . 22