DMM Y. Kim Internet-Draft Soongsil University Intended status: Standards Track S. Jeon Expires: January 7, 2016 Instituto de Telecomunicacoes July 06, 2015 Enhanced Mobility Anchoring in Distributed Mobility Management draft-yhkim-dmm-enhanced-anchoring-02.txt Abstract This document presents a new perspective for the solution design of enhanced mobility anchoring over DMM deployment models described in [draft-sijeon-dmm-deployment-models]. 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 7, 2016. Copyright Notice Copyright (c) 2015 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. Kim & Jeon Expires January 7, 2016 [Page 1] Internet-Draft Enhanced Mobility Anchoring in DMM July 2015 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Conventions and Terminology . . . . . . . . . . . . . . . . . 2 3. Enhanced Mobility Anchoring . . . . . . . . . . . . . . . . . 3 3.1. Distributed AM, LM, and FM (with centralized LM) - All- in-One . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2. Distributed AF-DP, LM and FM with centralized AF-CP (+ LM) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.3. Distributed AF-DP and FM-DP with centralized AF-CP, LM, and FM-CP . . . . . . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 5. Security Considerations . . . . . . . . . . . . . . . . . . . 5 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5 7. Normative References . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6 1. Introduction This document aims to identify what should be enhanced for mobility anchoring and to provide possible approaches for the enhanced mobility anchoring over the three functional deployment models presented in [draft-sijeon-dmm-deployment-models]. 2. Conventions and Terminology 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 [RFC2119]. This document focuses on enhanced mobility anchoring based on the functional deployment models presented in [draft-sijeon-dmm- deployment-models], which describes deployment models with mobility management functions in [RFC7429]. Therefore, the definitions of location management (LM) and forwarding management (FM) for mobility management are followed as they are. Internetwork Location Management (LM) is a control-plane function, which manages and keeps track of the internetwork location of an MN. The location information may be a binding of the advertised IP address/prefix, e.g., HoA or HNP, to the IP routing address of the MN, or it may be a binding of a node that can forward packets destined to the MN. Forwarding Management (FM) function performs packet interception and forwarding to/from the IP address/prefix assigned to the MN, based on the internetwork location information, either to the destination or to some other network element that knows how to forward the packets to their destination. Following the FM definition in [RFC7429], it may be split into the control plane (FM-CP) and data plane (FM-DP). However, definition of Anchoring function is modified, following the Kim & Jeon Expires January 7, 2016 [Page 2] Internet-Draft Enhanced Mobility Anchoring in DMM July 2015 definition in [draft-sijeon-dmm-deployment-models]. Anchoring Function (AF) is defined as a combined control-plane and data-plane functions. For the control-plane function, it allocates an IP address, i.e., Home Address (HoA), or prefix, i.e., Home Network Prefix (HNP) a mobile node, topologically anchored by the advertising node. That is, the anchor node is able to advertise a connected route into the routing infrastructure for the allocated IP prefixes. It also takes a data-plane anchor point where packets destined to the IP address or IP prefix allocated by the anchor should pass through. It can be deployed in a decoupled way, i.e. separated control plane and data plane. In that case, following two terms - AF-CP and AF-DP - are used. AF-CP is responsible of allocating the IP address and advertising a connected route for an associated terminal while AF-DP is responsible of anchoring received data packets destined to the IP address allocated by the anchor. 3. Enhanced Mobility Anchoring Based on the presented functional deployment models for DMM, we describe what anchoring models are available and which aspects of mobility anchoring can be enhanced. 3.1. Distributed AM, LM, and FM (with centralized LM) - All-in-One +--------------------------+ | (LM) | +--------------------------+ ^ ^ | | | | v v +-------------+ +-------------+ |AF + LM + FM | (<---->) |AF + LM + FM | +-------------+ +-------------+ +------+ | MN | +------+ Figure 1. Distributed AM, LM, and FM functions (with centralized LM) Fig. 1 shows AF is distributed with LM and FM at edge mobility routers. The AF allocates an IP address or IP prefix and advertises a connected route of the mobile terminal configured with the allocated IP address or IP prefix, when the terminal is attached at a Kim & Jeon Expires January 7, 2016 [Page 3] Internet-Draft Enhanced Mobility Anchoring in DMM July 2015 mobility router. It takes a role of intercepting packets destined to the allocated IP address/prefix of the mobile terminal. 3.2. Distributed AF-DP, LM and FM with centralized AF-CP (+ LM) +--------------------------+ | AF-CP (+ LM) | +--------------------------+ ^ ^ | | | | v v +-----------+ +-----------+ | AF-DP | | AF-DP | | LM + FM | (<----->) | LM + FM | +-----------+ +-----------+ +------+ | MN | +------+ Figure 2. Distributed AF-DP, LM and FM functions with centralized AF-CP (+ LM) The deployment model in Fig. 2 shows that AF-DP is distributed with LM and FM into deployed mobility routers while AF-CP is centralized in a single entity. Allocating an IP address/prefix is provided by AF-CP, while packet interception is supported by AF-DP. As the control plane and data plane of AF is separated, flexible AF-DP selection can be enabled for load balancing or network management, as an enhanced mobility anchoring aspect. Based on the separated AF-CP and AF-DP architecture, switching of AF-DP can be supported under the control of AF-CP. 3.3. Distributed AF-DP and FM-DP with centralized AF-CP, LM, and FM-CP Kim & Jeon Expires January 7, 2016 [Page 4] Internet-Draft Enhanced Mobility Anchoring in DMM July 2015 +--------------------------+ | AF-CP + LM + FM-CP | +--------------------------+ ^ ^ | | | | v v +---------------+ +---------------+ | AF-DP + FM-DP | (<--->) | AF-DP + FM-DP | +---------------+ +---------------+ +------+ | MN | +------+ Figure 3. Distributed AF-DP and FM-DP with centralized AF-CP, LM, and FM-CP In the function deployment model shown in Fig. 3, separation of FM-CP and FM-DP is implemented with the separation of AF-CP and AF-DP. The LM is located at the central entity. Comparing deployment models described in Fig. 3 and Fig. 2, this deployment model facilitates management and optimization of forwarding path, even in the mid- session, between the AF-DP of an allocated IP address and a current serving router where the terminal is attached. Moreover, it enables supporting a flexible selection of forwarding data path well as supporting a flexible AF-DP selection by AF-CP. 4. IANA Considerations This document makes no request of IANA. 5. Security Considerations T.B.D. 6. Acknowledgements 7. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC7333] Chan, H., Liu, D., Seite, P., Yokota, H., and J. Korhonen, "Requirements for Distributed Mobility Management", RFC 7333, August 2014. Kim & Jeon Expires January 7, 2016 [Page 5] Internet-Draft Enhanced Mobility Anchoring in DMM July 2015 [RFC7429] Liu, D., Zuniga, JC., Seite, P., Chan, H., and CJ. Bernardos, "Distributed Mobility Management: Current Practices and Gap Analysis", RFC 7429, January 2015. Authors' Addresses Younghan Kim Soongsil University 369, Sangdo-ro, Dongjak-gu Seoul 156-743 Korea Email: younghak@ssu.ac.kr Seil Jeon Instituto de Telecomunicacoes Campus Universitario de Santiago Aveiro 3810-193 Portugal Email: seiljeon@av.it.pt Kim & Jeon Expires January 7, 2016 [Page 6]