CCAMP Working Group Y. Lee Internet-Draft Samsung Intended status: Standards Track K. Lee Expires: September 10, 2020 Korea Telecom H. Zheng D. Dhody Huawei Technologies O. Gonzalez de Dios Telefonica D. Ceccarelli Ericsson March 9, 2020 A YANG Data Model for L1 Connectivity Service Model (L1CSM) draft-ietf-ccamp-l1csm-yang-11 Abstract This document provides a YANG data model for Layer 1 Connectivity Service Model (L1CSM). The intent of this document is to provide a Layer 1 service model exploiting YANG data model, which can be utilized by a customer network controller to initiate a service request connectivity as well as retrieving service states toward a Layer 1 network controller communicating with its customer network controller. This YANG model is NMDA-compliant. 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 https://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 September 10, 2020. Lee, et al. Expires September 10, 2020 [Page 1] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 Copyright Notice Copyright (c) 2020 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 (https://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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Deployment Scenarios . . . . . . . . . . . . . . . . . . 3 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6 1.3. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 6 1.4. Prefixes in Data Node Names . . . . . . . . . . . . . . . 6 2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 7 3. L1CSM YANG Model (Tree Structure) . . . . . . . . . . . . . . 7 4. L1CSM YANG Code . . . . . . . . . . . . . . . . . . . . . . . 8 5. JSON Example . . . . . . . . . . . . . . . . . . . . . . . . 12 6. Security Considerations . . . . . . . . . . . . . . . . . . . 14 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 15 9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 15 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 15 10.1. Normative References . . . . . . . . . . . . . . . . . . 15 10.2. Informative References . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17 1. Introduction This document provides a YANG data model for L1VPN Connectivity Service Model (L1CSM) which can be classified as Network Service YANG module per [RFC8199]. The intent of this document is to provide a transport service model exploiting YANG data model, which can be utilized by a client network controller to initiate a service request connectivity request as well as retrieving service states toward a transport network controller communicating with the client controller via a NETCONF [RFC8341] or a RESTCONF [RFC8040] interface. [RFC4847] provides a framework and service level requirements for Layer 1 Virtual Private Networks (L1VPNs). It classifies service Lee, et al. Expires September 10, 2020 [Page 2] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 models as management-based service model, signaling-based service model (Basic Mode) and signaling and routing service model (Enhanced Mode). In the management-based service model, customer management systems and provider management systems communicate with each other. Customer management systems access provider management systems to request layer 1 connection setup/deletion between a pair of CEs. Customer management systems may obtain additional information, such as resource availability information and monitoring information, from provider management systems. There is no control message exchange between a CE and PE. In the signaling-based service model (Basic Model), the CE-PE interface's functional repertoire is limited to path setup signaling only. In the Signaling and routing service model (Enhanced Mode), the CE-PE interface provides the signaling capabilities as in the Basic Mode, plus permits limited exchange of information between the control planes of the provider and the customer to help such functions as discovery of customer network routing information (i.e., reachability or TE information in remote customer sites), or parameters of the part of the provider's network dedicated to the customer. The primary focus of this document is to describe L1CS YANG model required for the instantiation of point-to-point L1VPN service. A L1VPN is a service offered by a core layer 1 network to provide layer 1 connectivity between two or more customer sites where the customer has some control over the establishment and type of the connectivity. The data model presented in Section 3 is in consistent with [MEF63]. The data model includes configuration and state data according to the new Network Management Datastore Architecture [RFC8342]. 1.1. Deployment Scenarios Figure 1 depicts a deployment scenario of the L1VPN SDN control-based service model for an external customer instantiating L1 point-to- point connectivity to the provider. Lee, et al. Expires September 10, 2020 [Page 3] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 +------------+ | Customer | | Service | |Orchestrator| +------------+ | .. .. .. .. ..|.. .. .. .. .. .. : | : : +--------------------+ : : | | : : | +----------+ | : : | | Network | | : : | | SDN | | : : | |Controller| | : : | |/NMS/EMS | | : : | +----------+ | : : | | : : | | : +----+ : +----+ +----+ +----+ : +----+ | CE |----:---| PE |----| P |----| PE |---:---| CE | +----+ : +----+ +----+ +----+ : +----+ : | | : : | | : : +--------------------+ : : | | : : |<-Provider network->| : Customer Customer Interface Interface Figure 1: L1VPN SDN Controller/EMS/NMS-Based Service Model: External Customer With this scenario, the customer service orchestrator interfaces with the network SDN controller of the provider using Customer Service Model as defined in [RFC8309]. Figure 2 depicts another deployment scenario for internal customer (e.g., higher-layer service management department(s)) interfacing the layer 1 transport network department. With this scenario, a multi- service backbone is characterized such that each service department of a provider (e.g., L2/3 services) that receives the same provider's L1VPN service provides a different kind of higher-layer service. The customer receiving the L1VPN service (i.e., each service department) can offer its own services, whose payloads can be any layer (e.g., ATM, IP, TDM). The layer 1 transport network and each service Lee, et al. Expires September 10, 2020 [Page 4] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 network belong to the same organization, but may be managed separately. The Service SDN Controller is the control/management entity owned by higher-layer service department (e.g., L2/3 VPN) whereas the Network SDN Controller is the control/management entity responsible for Layer 1 connectivity service. The CEs in Figure 2 are L2/3 devices that interface with L1 PE devices. +----------+ | Service | | SDN | |Controller| |/EMS/NMS | | for L2/3 | +----------+ | | | +--------------------+ | | | +----------+ | | | Network | | | | SDN | | | |Controller| | | |/EMS/NMS | | | | for L1VPN| | | +----------+ | | | | | +----+ +----+ +----+ +----+ +----+ | CE |--------| PE |----| P |----| PE |------| CE | +----+ +----+ +----+ +----+ +----+ | | | | | | | | | +--------------------+ | | | | | | |<------------------>| | | Provider Network | | For Layer 1 | |<------------------------------------------>| Provider Network for L2/3 Figure 2: L1VPN SDN Controller/EMS/NMS-Based Service Model: Internal Customer Lee, et al. Expires September 10, 2020 [Page 5] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 The benefit is that the same layer 1 transport network resources are shared by multiple services. A large capacity backbone network (data plane) can be built economically by having the resources shared by multiple services usually with flexibility to modify topologies, while separating the control functions for each service department. Thus, each customer can select a specific set of features that are needed to provide their own service [RFC4847]. 1.2. Terminology Refer to [RFC4847] and [RFC5253] for the key terms used in this document. The following terms are defined in [RFC7950] and are not redefined here: o client o server o augment o data model o data node The following terms are defined in [RFC6241] and are not redefined here: o configuration data o state data The terminology for describing YANG data models is found in [RFC7950]. 1.3. Tree Diagram A simplified graphical representation of the data model is used in Section 3 of this this document. The meaning of the symbols in these diagrams is defined in [RFC8340]. 1.4. Prefixes in Data Node Names In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules. The module ietf-layer1-types Lee, et al. Expires September 10, 2020 [Page 6] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 specified in [I-D.ietf-ccamp-layer1-types] and ietf-yang-types specified in [RFC6991] are imported in this module. +-------------+-------------------+------------------------------+ | Prefix | YANG module | Reference | +-------------+-------------------+------------------------------+ | l1csm | ietf-l1csm | [RFC XXXX] | | l1-types | ietf-layer1-types |[I-D.ietf-ccamp-layer1-types] | | yang | ietf-yang-types | [RFC6991] | +-------------+-------------------+------------------------------+ Note: The RFC Editor will replace XXXX with the number assigned to the RFC once this document becomes an RFC. 2. Definitions L1VC Layer 1 Virtual Connection SLS Service Level Specification UNI User Network Interface PE Provider Edge CE Customer Edge EP End Point P Protocol C Coding O Optical Interface 3. L1CSM YANG Model (Tree Structure) Lee, et al. Expires September 10, 2020 [Page 7] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 module: ietf-l1csm +--rw l1-connectivity +--rw access | +--rw unis | +--rw uni* [id] | +--rw id string | +--rw protocol? identityref | +--rw coding? identityref | +--rw optical-interface? identityref +--rw services +--rw service* [service-id] +--rw service-id string +--rw endpoint-1 | +--rw id string | +--rw uni | -> /l1-connectivity/access/unis/uni/id +--rw endpoint-2 | +--rw id string | +--rw uni | -> /l1-connectivity/access/unis/uni/id +--rw start-time? yang:date-and-time +--rw time-interval? int32 +--rw performance-metric* identityref 4. L1CSM YANG Code file "ietf-l1csms@2020-03-09.yang" module ietf-l1csm { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-l1csm"; prefix "l1csm"; import ietf-yang-types { prefix "yang"; } import ietf-layer1-types { prefix "l1-types"; } organization "Internet Engineering Task Force (IETF) CCAMP WG"; contact Lee, et al. Expires September 10, 2020 [Page 8] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 "Editor: Y. Lee (younglee.tx@gmail.com) Editor: K. Lee (kwangkoog.lee@kt.com) Editor: H. Zheng (zhenghaomian@huawei.com) Editor: D. Dhody (dhruv.ietf@gmail.com) Editor: O. G. de-Dios (oscar.gonzalezdedios@telefonica.com) Editor: D. Ceccarelli (daniele.ceccarelli@ericsson.com)"; description "This module describes L1 connectivity service based on MEF 63: Subscriber Layer 1 Service Attribute Technical Specification. Refer to MEF 63 for all terms and the original references used in the module. Copyright (c) 2020 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision "2020-03-09" { description "Initial revision."; reference "RFC XXXX: A Yang Data Model for L1 Connectivity Service Model (L1CSM)"; // Note: The RFC Editor will replace XXXX with the number // assigned to the RFC once this document becomes an RFC. } grouping protocol-coding-optical-interface { description "describes where p:protocol type; c:coding function; o:optical interface function"; reference "MEF 63"; leaf protocol { type identityref { base "l1-types:client-signal"; } description "List of physical layer L1VC client protocol"; } leaf coding { type identityref { Lee, et al. Expires September 10, 2020 [Page 9] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 base "l1-types:coding-func"; } description "coding function"; } leaf optical-interface { type identityref { base "l1-types:optical-interface-func"; } description "optical-interface-function"; } } grouping subscriber-l1vc-sls-service-attribute { description "The value of the Subscriber L1VC SLS (Service Level Specification) Service Attribute"; reference "MEF 63"; leaf start-time { type yang:date-and-time; description "a time that represent the date and time for the start of the SLS"; } leaf time-interval { type int32; units seconds; description "a time interval (e.g., 2,419,200 seconds which is 28 days) that is used in conjunction wuth time-start to specify a contiguous sequence of time intervals T for determining when performance objectives are met."; } leaf-list performance-metric { type identityref { base "l1-types:service-performance-metric"; } description "list of service performance metric."; } } grouping subscriber-l1vc-endpoint-attributes { description "subscriber layer 1 connection endpoint attributes"; Lee, et al. Expires September 10, 2020 [Page 10] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 reference "MEF 63"; container endpoint-1 { description "One end of UNI id's - string and id"; leaf id { type string; mandatory true; description "subscriber end point ID of one end"; } leaf uni { type leafref { path "/l1-connectivity/access/unis/uni/id"; } mandatory true; description "this is one end of subscriber L1VC end point ID value = UNI-1"; } } container endpoint-2 { description "One end of UNI id's - string and id"; leaf id { type string; mandatory true; description "subscriber end point ID of the other end"; } leaf uni { type leafref { path "/l1-connectivity/access/unis/uni/id"; } mandatory true; description "this is one other end of subscriber L1VC end point ID value = UNI-2"; } } } container l1-connectivity { description "serves as a top-level container for a list of layer 1 connection services (l1cs)"; container access { description "UNI configurations for access networks"; container unis { Lee, et al. Expires September 10, 2020 [Page 11] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 description "the list of UNI's to be configured"; list uni { key "id"; description "UNI identifier"; leaf id { type string; description "the UNI id of UNI Service Attributes"; } uses protocol-coding-optical-interface; } } } container services { description "L1VC services"; list service { key "service-id"; description "an unique identifier of a subscriber L1VC service"; leaf service-id { type string; mandatory true; description "a unique service identifier for subscriber L1VC."; } uses subscriber-l1vc-endpoint-attributes; uses subscriber-l1vc-sls-service-attribute; }//end of service list } //end of service container }//service top container } 5. JSON Example This section provides a JSON example of the YANG module described in Section 4. This example configures one L1VC service with two UNIs that describe the UNI endpoints. The service is configured with the starting time to be 06:06:09 on 2018-09-13 for the service life time of 2419200 seconds (which is corresponds to 28 days). In addition, Lee, et al. Expires September 10, 2020 [Page 12] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 the service is configured to collect one performance metric, One-way- Delay. { "l1-connectivity": { "access": { "unis": { "uni": [ { "id": "MTL-HQ-Node3-Slot2-Port1", "protocol": "ETH-10GigE_LAN ", "coding": "ETH-10GR-PCS-49 ", "optical_interface": "LR-PMD-clause-52 " }, { "id": "MTL-STL-Node5-Slot4-Port3", "protocol": "ETH-10GigE_LAN ", "coding": "ETH-10GR-PCS-49 ", "optical_interface": "ER-PMD-clause-52 " } ] }, }, "services": { "service": [ { "service-id": "Sub-L1VC-1867-LT-MEGAMART", "endpoint-1": { "id": "MTL-HQ_1867-MEGAMART", "uni": "MTL-HQ-Node3-Slot2-Port1" }, "endpoint-2": { "id": "MTL-STL_1867-MEGAMART", "uni": "MTL-STL-Node5-Slot4-Port3" }, "start-time": "2018-09-13T06:06:09Z", "time-interval": 2419200, "performance-metric": "One-way-Delay " } ] }, } Lee, et al. Expires September 10, 2020 [Page 13] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 6. Security Considerations The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446]. The NETCONF access control model [RFC8341] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. A number of configuration data nodes defined in this document are writable/deletable (i.e., "config true") These data nodes may be considered sensitive or vulnerable in some network environments. These are the subtrees and data nodes and their sensitivity/ vulnerability: unis: - id Service: - service-id - endpoint-1 - endpoint-2 - start-time - time-interval - performance-metric The security considerations spelled out in the YANG 1.1 specification [RFC7950] apply for this document as well. 7. IANA Considerations It is proposed that IANA should assign new URIs from the "IETF XML Registry" [RFC3688] as follows: Lee, et al. Expires September 10, 2020 [Page 14] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 URI: urn:ietf:params:xml:ns:yang:ietf-l1csm Registrant Contact: The IESG XML: N/A; the requested URI is an XML namespace. This document registers following YANG modules in the YANG Module Names registry [RFC7950]. name: ietf-l1csm namespace: urn:ietf:params:xml:ns:yang:ietf-l1csm prefix: l1csm reference: RFC XXXX 8. Acknowledgements The authors would like to thank Tom Petch for his helpful comments and valuable contributions and Robert Wilton for his review that improved the model significantly. 9. Contributors Italo Busi Huawei Technologies Email: Italo.Busi@huawei.com Giuseppe Fioccola Huawei Technologies Email: giuseppe.fioccola@huawei.com 10. References 10.1. Normative References [MEF63] Metro Ethernet Forum, "Subscriber Layer1 Service Attributes Technical Specification", MEF 63, August 2018. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . Lee, et al. Expires September 10, 2020 [Page 15] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . 10.2. Informative References [I-D.ietf-ccamp-layer1-types] Zheng, H. and I. Busi, "A YANG Data Model for Layer 1 Types", draft-ietf-ccamp-layer1-types-04 (work in progress), December 2019. [RFC4847] Takeda, T., Ed., "Framework and Requirements for Layer 1 Virtual Private Networks", RFC 4847, DOI 10.17487/RFC4847, April 2007, . Lee, et al. Expires September 10, 2020 [Page 16] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 [RFC5253] Takeda, T., Ed., "Applicability Statement for Layer 1 Virtual Private Network (L1VPN) Basic Mode", RFC 5253, DOI 10.17487/RFC5253, July 2008, . [RFC8199] Bogdanovic, D., Claise, B., and C. Moberg, "YANG Module Classification", RFC 8199, DOI 10.17487/RFC8199, July 2017, . [RFC8309] Wu, Q., Liu, W., and A. Farrel, "Service Models Explained", RFC 8309, DOI 10.17487/RFC8309, January 2018, . Authors' Addresses Young Lee Samsung Samsung Seoul South Korea Email: younglee.tx@gmail.com KwangKoog Lee Korea Telecom South Korea Email: kwangkoog.lee@kt.com Haomian Zheng Huawei Technologies H1-1-A043S Huawei Industrial Base, Songshanhu Dongguan, Guangdong 523808 China Email: zhenghaomian@huawei.com Dhruv Dhody Huawei Technologies India Email: dhruv.ietf@gmail.com Lee, et al. Expires September 10, 2020 [Page 17] Internet-Draft A YANG Data Model for Layer 1 Types March 2020 Oscar Gonzalez de Dios Telefonica Email: oscar.gonzalezdedios@telefonica.com Daniele Ceccarelli Ericsson Email: daniele.ceccarelli@ericsson.com Lee, et al. Expires September 10, 2020 [Page 18]