Network Working Group M. Bocci Internet-Draft L. Levrau Updates: 5921 (if approved) Alcatel-Lucent Intended status: Informational D. Frost Expires: February 4, 2011 Cisco August 3, 2010 MPLS Transport Profile User-to-Network and Network-to-Network Interfaces draft-bfl-mpls-tp-uni-nni-00 Abstract The framework for MPLS in transport networks [RFC5921] provides reference models for an MPLS-TP User-to-Network Interface (UNI), and an MPLS-TP Network-to-Network interface (NNI). This document updates those reference models to show detailed reference points for these interfaces, along with further clarification of the functional architecture of MPLS-TP at a UNI and NNI. This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge (PWE3) architectures to support the capabilities and functionalities of a packet transport network as defined by the ITU-T. This Informational Internet-Draft is aimed at achieving IETF Consensus before publication as an RFC and will be subjet to an IETF Last Call. [RFC Editor, please remove this note before publication as an RFC and insert the correct Streams Boilerplate to indicate that the published RFC has IETF onsensus.] 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 Bocci, et al. Expires February 4, 2011 [Page 1] Internet-Draft MPLS-TP UNI and NNI August 2010 material or to cite them other than as "work in progress." This Internet-Draft will expire on February 4, 2011. 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 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. Bocci, et al. Expires February 4, 2011 [Page 2] Internet-Draft MPLS-TP UNI and NNI August 2010 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Updates to the MPLS-TP UNI and NNI . . . . . . . . . . . . 4 1.2. Terminology and Abbreviations . . . . . . . . . . . . . . . 4 2. MPLS-TP User-to-Network Interface . . . . . . . . . . . . . . . 5 3. MPLS-TP Network-to-Network Interface . . . . . . . . . . . . . 6 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 7 7. Normative References . . . . . . . . . . . . . . . . . . . . . 7 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7 Bocci, et al. Expires February 4, 2011 [Page 3] Internet-Draft MPLS-TP UNI and NNI August 2010 1. Introduction The framework for MPLS in transport networks [RFC5921] provides reference models for an MPLS-TP User-to-Network Interface (UNI), and an MPLS-TP Network-to-Network interface (NNI). This document updates those reference models to show detailed reference points for these interfaces, along with further clarification of the functional architecture of MPLS-TP at a UNI and NNI. This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and PWE3 architectures to support the capabilities and functionalities of a packet transport network as defined by the ITU-T. 1.1. Updates to the MPLS-TP UNI and NNI The transport service interfaces for MPLS-TP are defined in Section 3.4.3 of [RFC5921]. These definitions are illustrated by showing MPLS-TP PEs containing a UNI and an NNI. The figures illustrate the UNI and the NNI as a span. However, it is more conventional to illustrate these interfaces as reference points. Furthermore, in the case of a UNI, it is useful to illustrate the distribution of UNI functions between the CE side and the PE side of the UNI (the UNI-C and UNI-N). This document provides updated illustrations of the MPLS-TP UNI and MPLS-TP NNI to show these additional details. These illustrations are intended to obsolete the corresponding ones in [RFC5921]. This document also defines additional terminology referenced in the illustrations. No other updates are proposed by this document. 1.2. Terminology and Abbreviations The terminology and abbreviations of [RFC5921] apply. The following additional terminology is used in this document. Term Definition ----- --------------------------------------------- CP Control Plane NNI Network-to-Network Interface TSI Transport Service Instance UNI User-to-Network Interface UNI-C User-to-Network Interface, Customer Edge side UNI-N User-to-Network Interface, PE Side Bocci, et al. Expires February 4, 2011 [Page 4] Internet-Draft MPLS-TP UNI and NNI August 2010 2. MPLS-TP User-to-Network Interface The MPLS-TP User-Network interface (UNI) is illustrated in Figure 1. This figure obsoletes Figure 3 of [RFC5921]. Note that the term MPLS UNI is to be interpreted as a UNI to an MPLS-TP network and does not refer to the protocol transiting the UNI. UNI : MPLS-TP :<-- UNI-C -->: : :<-- UNI-N ->: Network <-----> : function : : : function : ------------- : ------------:-------------------- : | : | : Transport | : | V | Native : Path | : | | Service : Mux/Demux | : | | Control : -- | : ---------- | | ----------: | | Transport| :| | | | | | | | Path | :|Signaling |_|___________|_|Signaling | | | ---------> :|Controller| | | |Controller| | | | : ---------- | | ---------- | | ---------> : :......|...........|......: : | | | : | Control | : | | Transport| : | Channel | : | | Path | : | | : | | ---------> : | | : | | -+----------->TSI : | | Transport : | | | ---------> : | Client | Service : | | | | : | Traffic | Data Plane: | | | | : ---------- | Flows | -------------- | | |Transport| :| Client |-|-----------|-|Client/Service|-| |- Path | :| Traffic |=|===========|=| Traffic | | | ---------> :|Processing| | | | Processing |=| |===+===========>TSI : ---------- | | -------------- | | ---------> : |______|___________|______| : | | | : | Data Link | : | | | : | | : -- | : | | : Transport | : | | : Path | : | | : Data Plane| ------------- --------------------------------- Customer Edge Node MPLS-TP Provider Edge Node Note: Native service control = Control plane belonging to the native service and/or GMPLS UNI Figure 1: UNI Between CE Node and MPLS-TP PE Node Bocci, et al. Expires February 4, 2011 [Page 5] Internet-Draft MPLS-TP UNI and NNI August 2010 3. MPLS-TP Network-to-Network Interface The MPLS-TP NNI is illustrated in Figure 1. This figure obsoletes Figure 5 of [RFC5921]. NNI :<--- NNI --->: : :<--- NNI ---->: : Function : : : Function : --------------------------- : -------------------------- | : Transport | : | Transport : | | : Service CP | V | Service CP : | | : ---------- |Signaling| ---------- : | | : |Signaling |_| _______ |_|Signaling | : | | : |Controller| | | |Controller| : | | : ---------- | | ---------- : | | : :....... Control .......: : | | : | Channel | : | | - : Transport | | Transport : - | | | | : Path CP | | Path CP : | | | | | | : ---------- |Signaling| ---------- : | | | -----| | : |Signaling |_| _______ |_|Signaling | : | |----- ---+-| | : |Controller| | | |Controller| : | |-+--- -----| | : ---------- | | ---------- : | |----- | | | : :....... Control .......: : | | | | | | : | Channel | : | | | | | | Transport Path | | Transport Path | | | | | | / mux/demux \ | | / mux/demux \| | | | | |/ : \-- | | -- / : | | | | | | ---------- | | |Transport| | | ---------- | | | | | |--|Transport |---| | | Path | | |---|Transport |--| | | -----| | | Service | | |-------------| | | Service | | |----- TSI+=| |==|Processing|===| |<+===TSI===+>| |===|Processing|==| |=+TSI -----| | ---------- | |-------------| | ---------- | |----- | | | : | | | | | | : | | | | | | : | | | | | | : | | | | - : -- | | -- : - | | : | | : | | Transport Path | | Transport Path | | Data Plane | Data Plane | --------------------------- -------------------------- MPLS-TP Provider MPLS-TP Provider Edge Node A Edge Node B Note: The Transport Service signaling controller is only required where the Transport Path terminates. Figure 2: NNI Between MPLS-TP PE Nodes Bocci, et al. Expires February 4, 2011 [Page 6] Internet-Draft MPLS-TP UNI and NNI August 2010 4. IANA Considerations This document makes no request of IANA. Note to RFC Editor: this section may be removed on publication as an RFC. 5. Security Considerations The security considerations of RFC5921 apply. The updated reference models provided by this document introduce no new security considerations. 6. Acknowledgements The editors wish to thank the following for their contribution to this document: o Eve Varma. o Dieter Beller. o Lou Berger. o Stewart Bryant. o Italo Busi. o The participants of ITU-T Study Group 15. 7. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5921] Bocci, M., Bryant, S., Frost, D., Levrau, L., and L. Berger, "A Framework for MPLS in Transport Networks", RFC 5921, July 2010. Bocci, et al. Expires February 4, 2011 [Page 7] Internet-Draft MPLS-TP UNI and NNI August 2010 Authors' Addresses Matthew Bocci Alcatel-Lucent Email: matthew.bocci@alcatel-lucent.com Lieven Levrau Alcatel-Lucent Phone: Fax: Email: lieven.levrau@alcatel-lucent.com URI: Dan Frost Cisco Phone: Fax: Email: danfrost@cisco.com URI: Bocci, et al. Expires February 4, 2011 [Page 8]