V6OPS WG                                                   S. Gundavelli
Internet-Draft                                                     Cisco
Intended status: Standards Track                          August 8, 2011
Expires: February 9, 2012


        Reserved IPv6 Interface Identifier for Proxy Mobile IPv6
       draft-gundavelli-v6ops-pmipv6-address-reservations-01.txt

Abstract

   Proxy Mobile IPv6 [RFC5213] requires all the mobile access gateways
   to use a fixed link-local and link-layer addresses on any of its
   access links that it shares with the mobile nodes.  This was intended
   to ensure a mobile node does not detect any change with respect to
   its layer-3 attachment even after it roams from one mobile access
   gateway to another.  In the absence of any reserved addresses for
   this use, it requires coordination across vendors and the manual
   configuration of these addresses on all the mobility elements in a
   Proxy Mobile IPv6 domain.  This document attempts to simplify this
   operational requirement by making reservation for special addresses
   that can be used for this purpose.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on February 9, 2012.

Copyright Notice

   Copyright (c) 2011 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



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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . . . 3
     2.1.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . 4
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . 4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 5
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 5






























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.  Introduction

   Proxy Mobile IPv6 [RFC5213] is a network-based mobility management
   protocol that enables IP mobility support for a mobile node without
   requiring its participation in any mobility-related signaling.  The
   mobility elements in the network ensure that the mobile node does not
   detect any change with respect to its layer-3 attachment even after
   it roams from one mobile access gateway to another and changes its
   point of attachment in the network.  All the mobile access gateways
   in a Proxy Mobile IPv6 use a fixed link-local address and a fixed
   link-layer address on any of its access links that they share with
   the mobile nodes.  This essentially ensures a mobile node after
   performing an handoff does not detect any change with respect to the
   IP network configuration.

   The base Proxy Mobile IPv6 [RFC5213] all though required the use of a
   fixed link-local and a fixed layer-layer address, it did not reserve
   any specific addresses for this purpose and this is proving to be a
   operational challenge in deployments involving multi-vendor
   equipment.  To address this problem, this specification makes the
   following two reservations.  The mobility elements in the Proxy
   Mobile IPv6 domain MAY choose to use these fixed addresses.

   This specification reserves the IPv6 interface identifier, IANA-TBD1,
   for the use of Proxy Mobile IPv6 [RFC5213].  The reserved IPv6
   interface identifier can be used by all the mobile access gateways in
   a Proxy Mobile IPv6 domain on all of the access links that it shares
   with the mobile nodes.  Specifically, the mobile access gateway can
   use this reserved IPv6 interface identifier for generating the link-
   local address that it uses in the Neighbor Discovery [RFC4861]
   related communication with the mobile node.  This reserved interface
   identifier is allocated from the registry, "Reserved IPv6 Interface
   Identifiers".

   Furthermore, this specification also reserves the Ethernet unicast
   address, IANA-TBD2, for the use of Proxy Mobile IPv6.  This reserved
   link-layer address can by used by the mobile access gateway in a
   Proxy Mobile IPv6 domain, on all of the access links that it shares
   with the mobile nodes.  This address will be used in all packet
   communication with the mobile node on the access links.
   Considerations from [RFC5342] apply with respect to the use of
   Ethernet parameters in IETF protocols.  This address is allocated
   from the registry, "IANA Ethernet Address block - Unicast Use".


.  Conventions and Terminology





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2.1.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.2.  Terminology

   All the mobility related terms used in this document are to be
   interpreted as defined in the base Proxy Mobile IPv6 specifications
   [RFC5213], [RFC5844].  All the IPv6 addressing related terminology is
   to be interpreted as specified in [RFC4291].


.  IANA Considerations

   This document requires the following two IANA actions.

   o  Action-1: This specification reserves an IPv6 interface identifier
      (IANA-TBD1) for Proxy Mobile IPv6 [RFC5213].  This fixed interface
      identifier needs to be allocated from the registry, "Reserved IPv6
      Interface Identifiers".

   o  Action-2: This specification reserves a IANA Ethernet unicast
      address (IANA-TBD2) for Proxy Mobile IPv6.  This address needs to
      be reserved from the block.  "IANA Ethernet Address block -
      Unicast Use".


.  Security Considerations

   There are no additional security considerations known at this point
   of time, beyond what are identified in [RFC5213], [RFC5844] and
   [RFC5453].


.  Acknowledgements

   The author would like to thank Jari Arkko and Dave Thaler for all the
   discussions around the use of fixed link-local and link-layer
   address, during the standardization of Proxy Mobile IPv6 [RFC5213].
   The authors would also like to thank Tero Kivinen, Donald Eastlake
   3rd, Eric Voit for their reviews of this document.


.  References





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6.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4291]  Hinden, R. and S. Deering, "IP Version 6 Addressing
              Architecture", RFC 4291, February 2006.

   [RFC5213]  Gundavelli, S., Leung, K., Devarapalli, V., Chowdhury, K.,
              and B. Patil, "Proxy Mobile IPv6", RFC 5213, August 2008.

   [RFC5453]  Krishnan, S., "Reserved IPv6 Interface Identifiers",
              RFC 5453, February 2009.

6.2.  Informative References

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              September 2007.

   [RFC5342]  Eastlake, D., "IANA Considerations and IETF Protocol Usage
              for IEEE 802 Parameters", BCP 141, RFC 5342,
              September 2008.

   [RFC5844]  Wakikawa, R. and S. Gundavelli, "IPv4 Support for Proxy
              Mobile IPv6", RFC 5844, May 2010.


Author's Address

   Sri Gundavelli
   Cisco
   170 West Tasman Drive
   San Jose, CA  95134
   USA

   Email: sgundave@cisco.com














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