V6OPS WG S. Gundavelli Internet-Draft Cisco Intended status: Standards Track July 3, 2011 Expires: January 4, 2012 Reserved IPv6 Interface Identifier for Proxy Mobile IPv6 draft-gundavelli-v6ops-pmipv6-address-reservations-00.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 Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on January 4, 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 Gundavelli Expires January 4, 2012 [Page 1] Internet-Draft Reserved IPv6 IID for PMIPv6 July 2011 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 . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions and Terminology . . . . . . . . . . . . . . . . . . 3 2.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . 4 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.1. Normative References . . . . . . . . . . . . . . . . . . . 4 6.2. Informative References . . . . . . . . . . . . . . . . . . 5 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 5 Gundavelli Expires January 4, 2012 [Page 2] Internet-Draft Reserved IPv6 IID for PMIPv6 July 2011 1. 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 link-layer address on any of its access links that they share with the mobile nodes. It essentially ensures a mobile node after performing an handoff does not detect any link change. 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 an IPv6 interface identifier for 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 any of its access links that it shares with the mobile node. 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 fixed identifier needs to be reserved from the registry, "Reserved IPv6 Interface Identifiers". Furthermore, this specification also reserves a IANA Ethernet unicast address for Proxy Mobile IPv6 use. This reserved link-layer address can by used by the mobile access gateway in a Proxy Mobile IPv6 domain, in the layer-2 header for all packet communication with the mobile node. 2. Conventions and Terminology 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]. Gundavelli Expires January 4, 2012 [Page 3] Internet-Draft Reserved IPv6 IID for PMIPv6 July 2011 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]. 3. IANA Considerations This document requires the following two IANA actions. o Action-1: This specification reserves an IPv6 interface identifier for Proxy Mobile IPv6 [RFC5213]. This fixed identifier needs to be reserved from the registry, "Reserved IPv6 Interface Identifiers". o Action-2: This specification reserves a IANA Ethernet unicast address for Proxy Mobile IPv6. This address needs to be reserved from the block. "IANA Ethernet Address block - Unicast Use". 4. Security Considerations There are no additional security considerations known at this point of time, beyond what are identified in [RFC5213] and [RFC5453]. 5. 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]. 6. References 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. Gundavelli Expires January 4, 2012 [Page 4] Internet-Draft Reserved IPv6 IID for PMIPv6 July 2011 [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. [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 Gundavelli Expires January 4, 2012 [Page 5]