Network Working Group X. Liu Internet-Draft Volta Networks Intended status: Standards Track J. Tantsura Expires: May 6, 2021 Apstra Networks I. Bryskin Individual L. Contreras Telefonica Q. Wu Huawei S. Belotti R. Rokui Nokia November 2, 2020 IETF Network Slice YANG Data Model draft-liu-teas-transport-network-slice-yang-02 Abstract This document describes a YANG data model for managing and controlling IETF network slices, defined in [I-D.nsdt-teas-ietf-network-slice-definition]. 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 May 6, 2021. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. Liu, et al. Expires May 6, 2021 [Page 1] Internet-Draft IETF Network Slice YANG Model November 2020 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. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 2. Modeling Considerations . . . . . . . . . . . . . . . . . . . 3 2.1. Relationships to Related Topology Models . . . . . . . . 3 2.2. Network Slice with TE . . . . . . . . . . . . . . . . . . 4 2.3. ACTN for Network Slicing . . . . . . . . . . . . . . . . 5 3. Model Applicability . . . . . . . . . . . . . . . . . . . . . 5 3.1. Network Slicing by Virtualization . . . . . . . . . . . . 5 3.2. Network Slicing by TE Overlay . . . . . . . . . . . . . . 8 4. Model Tree Structure . . . . . . . . . . . . . . . . . . . . 10 5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 10 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16 7. Security Considerations . . . . . . . . . . . . . . . . . . . 17 8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 18 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 18 9.1. Normative References . . . . . . . . . . . . . . . . . . 18 9.2. Informative References . . . . . . . . . . . . . . . . . 20 Appendix A. Data Tree for the Example in Section 3.1. . . . . . 22 A.1. Native Topology . . . . . . . . . . . . . . . . . . . . . 22 A.2. Network Slice Blue . . . . . . . . . . . . . . . . . . . 26 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 32 1. Introduction This document defines a YANG [RFC7950] data model for for representing, managing, and controlling IETF network slices, defined in [I-D.nsdt-teas-ietf-network-slice-definition] The defined data model is an interface between clients and providers for configurations and state retrievals, so as to support network slicing as a service. Through this model, a client can learn the slicing capabilities and the available resources of the provider. A client can request or negotiate with a network slicing provider to create an instance. The client can incrementally update its requirements on individual topology elements in the slice instance, Liu, et al. Expires May 6, 2021 [Page 2] Internet-Draft IETF Network Slice YANG Model November 2020 and retrieve the operational states of these elements. With the help of other mechanisms and data models defined in IETF, the telemetry information can be published to the client. The YANG data model in this document conforms to the Network Management Datastore Architecture (NMDA) [RFC8342]. 1.1. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. The following terms are defined in [RFC7950] and are not redefined here: o augment o data model o data node 1.2. Tree Diagrams Tree diagrams used in this document follow the notation defined in [RFC8340]. 2. Modeling Considerations An IETF network slice is modeled as network topology defined in [RFC8345], with augmentations. A new network type "network-slice" is defined in this document. When a network topology data instance contains the network-slice network type, it represents an instance of an IETF network slice. 2.1. Relationships to Related Topology Models There are several related YANG data models that have been defined in IETF. Some of these are: Network Topology Model: Defined in [RFC8345]. OTN Topology Model: Defined in [I-D.ietf-ccamp-otn-topo-yang]. Liu, et al. Expires May 6, 2021 [Page 3] Internet-Draft IETF Network Slice YANG Model November 2020 L2 Topology Model: Defined in [I-D.ietf-i2rs-yang-l2-network-topology]. L3 Topology Model: Defined in [RFC8346]. TE Topology Model: Defined in [RFC8795]. Figure 1 shows the relationships among these models. The box of dotted lines denotes the model defined in this document. +------------------------+ | | | Network Topology Model | | RFC 8345 | +------------------------+ | +-------------+-------------+-------------+-------------+ | | | | | V V V V V +----------+ +----------+ +----------+ +----------+ ............ | OTN | | L2 | | L3 | | TE | : Network : | Topology | | Topology | | Topology | | Topology | : Slice : | Model | | Model | | Model | | Model | : Model : +----------+ +----------+ +----------+ +----------+ '''''''''''' Figure 1: Model Relationships 2.2. Network Slice with TE In many situations, an IETF network slide needs to have TE (Traffic Engineering) capabilities to achieve certain network characteristics. The TE Topology Model defined in [RFC8795] can be used to make an IETF network slice TE capable. To achieve this, an IETF network slice instance will be configured to have both "network-slice" and "te-topology" network types, taking advantage of the multiple inheritance capability featured by the network topology model [RFC8345]. The following diagram shows their relations. Liu, et al. Expires May 6, 2021 [Page 4] Internet-Draft IETF Network Slice YANG Model November 2020 +--------------------+ +--------------------+ | Network Slice | | TE Topology | | ietf-network-slice | | ietf-te-topology | +--------------------+ +--------------------+ \ / \ / \ / v v +------------------------+ | Network Slice with TE | | | +------------------------+ Figure 2: Network Slice with TE This method can be applied to other types of network topology models too. For example, when a network topology instance is configured to have the types of "network-slice" defined in this document, "te- topology" defined in [RFC8795], and "l3-unicast-topology" defined in [RFC8346], this network topology instance becomes an IETF network slice instance that can perform layer 3 traffic engineering. 2.3. ACTN for Network Slicing Since ACTN topology data models are based on the network topology model defined in [RFC8345], the augmentations defined in this document are effective augmentations to the ACTN topology data models, resulting in making the ACTN framework [RFC8453] and data models [I-D.ietf-teas-actn-yang] capable of slicing networks with the required network characteristics. 3. Model Applicability There are many technologies to achieve network slicing. The data model defined in this document can be applied to a wide ranges of cases. This section describes how this data model is applied to a few cases. 3.1. Network Slicing by Virtualization In the case shown in Figure 3, node virtualization is used to separate and allocate resources in physical devices. Two virtual routers VR1 and VR2 are created over physical router R1. Each of the virtual routers takes a portion of the resources such as ports and memory in the physical router. Depending on the requirements and the implementations, they may share certain resources such as processors, ASICs, and switch fabric. Liu, et al. Expires May 6, 2021 [Page 5] Internet-Draft IETF Network Slice YANG Model November 2020 As an example, Appendix A. shows the JSON encoded data instances of the native topology and the customized topology for Network Slice Blue. Liu, et al. Expires May 6, 2021 [Page 6] Internet-Draft IETF Network Slice YANG Model November 2020 Client Topology Client Topology Network Slice Blue Network Slice Red +---+ +---+ +---+ -----|R3 |--- ---|R2 |------|R3 | / +---+ +---+ +---+ +---+ +---+ \ +---+ ---|R1 |------|R2 | -----|R4 |--- +---+ +---+ +---+ Clients --------------------------------------------------------------------- Provider Customized Topology Provider Network with Virtual Devices Network Slice Blue: VR1, VR3, VR5 +---+ ----------|VR5|------ / +---+ +---+ +---+ ------|VR1|---------|VR3| +---+ +---+ ------|VR2|---------|VR4| +---+ +---+ \ +---+ ----------|VR6|------ Network Slice Red: VR2, VR4, VR6 +---+ Virtual Devices --------------------------------------------------------------------- Physical Devices Native Topology Provider Network with Physical Devices +---+ ----------|R3 |------ / +---+ +---+ +---+ ======|R1 |=========|R2 | +---+ +---+ \ +---+ ----------|R4 |------ +---+ Figure 3: Network Slicing by Virtualization Liu, et al. Expires May 6, 2021 [Page 7] Internet-Draft IETF Network Slice YANG Model November 2020 3.2. Network Slicing by TE Overlay Figure 4 shows a case where TE (Traffic Engineering) overlay is applied to achieve logically separated client IETF network slices. In the underlay TE capable network, TE tunnels are established to support the TE links in the overlay network. These links and tunnels maintain the characteristics required by the clients. The provider selects the proper logical nodes and links in the overlay network, assigns them to specific IETF network slices, and uses the data model defined in this document to send the results to the clients. Liu, et al. Expires May 6, 2021 [Page 8] Internet-Draft IETF Network Slice YANG Model November 2020 Client Topology Client Topology Network Slice Blue Network Slice Red +---+ +---+ +---+ -----|R3 |--- ---|R1 |------|R2 | / +---+ +---+ +---+ +---+ +---+ \ +---+ ---|R1 |------|R2 | -----|R4 |--- +---+ +---+ +---+ Clients --------------------------------------------------------------------- Provider Customized Topology Provider Network with TE Isolation Network Slice Blue: R1, R2, R3 +---+ ----------|R3 |------ / +---+ +---+ +---+ ======|R1 |=========|R2 | +---+ +---+ \ +---+ ----------|R4 |------ +---+ Network Slice Red: R1, R2, R4 Overlay --------------------------------------------------------------------- Underlay Native Topology Provider Network with TE Tunnels +---+ TE Tunnel for Network Slice Blue ----------|R3 |------ @@@@@@@@@@@@@@ / +---+ +---+ +---+ +---+ ======|R1 |--|R5 |--|R2 | +---+ +---+ +---+ ############## \ +---+ TE Tunnel for Network Slice Red ----------|R4 |------ +---+ Figure 4: Network Slicing by TE Overlay Liu, et al. Expires May 6, 2021 [Page 9] Internet-Draft IETF Network Slice YANG Model November 2020 4. Model Tree Structure TODO - Complete IETF network slice attributes that are technology- agnostic and common to all use cases. module: ietf-network-slice augment /nw:networks/nw:network/nw:network-types: +--rw network-slice! augment /nw:networks/nw:network: +--rw network-slice +--rw optimization-criterion? identityref +--rw delay-tolerance? boolean +--rw periodicity* uint64 +--rw isolation-level? identityref augment /nw:networks/nw:network/nw:node: +--rw network-slice +--rw isolation-level? identityref +--rw compute-node-id? string +--rw storage-id? string augment /nw:networks/nw:network/nt:link: +--rw network-slice +--rw delay-tolerance? boolean +--rw periodicity* uint64 +--rw isolation-level? identityref 5. YANG Module This module references [RFC8345], [RFC8776], and [GSMA-NS-Template] file "ietf-network-slice@2020-11-01.yang" module ietf-network-slice { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-network-slice"; prefix "ns"; import ietf-network { prefix "nw"; reference "RFC 8345: A YANG Data Model for Network Topologies"; } import ietf-network-topology { prefix "nt"; reference "RFC 8345: A YANG Data Model for Network Topologies"; } Liu, et al. Expires May 6, 2021 [Page 10] Internet-Draft IETF Network Slice YANG Model November 2020 import ietf-te-types { prefix "te-types"; reference "RFC 8776: Traffic Engineering Common YANG Types"; } organization "IETF Traffic Engineering Architecture and Signaling (TEAS) Working Group"; contact "WG Web: WG List: Editor: Xufeng Liu Editor: Jeff Tantsura Editor: Igor Bryskin Editor: Luis Miguel Contreras Murillo Editor: Qin Wu Editor: Sergio Belotti Editor: Reza Rokui "; description "YANG data model for representing and managing network slices. 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 Liu, et al. Expires May 6, 2021 [Page 11] Internet-Draft IETF Network Slice YANG Model November 2020 (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 2020-11-01 { description "Initial revision"; reference "RFC XXXX: YANG Data Model for Network Slices"; } /* * Identities */ identity isolation-level { description "Base identity for the isolation-level."; reference "GSMA-NS-Template: Generic Network Slice Template, Version 3.0."; } identity no-isolation { base isolation-level; description "Network slices are not separated."; } identity physical-isolation { base isolation-level; description "Network slices are physically separated (e.g. different rack, different hardware, different location, etc.)."; } identity logical-isolation { base isolation-level; description "Network slices are logically separated."; } identity process-isolation { base physical-isolation; description "Process and threads isolation."; } identity physical-memory-isolation { base physical-isolation; description "Process and threads isolation."; } identity physical-network-isolation { Liu, et al. Expires May 6, 2021 [Page 12] Internet-Draft IETF Network Slice YANG Model November 2020 base physical-isolation; description "Process and threads isolation."; } identity virtual-resource-isolation { base logical-isolation; description "A network slice has access to specific range of resources that do not overlap with other network slices (e.g. VM isolation)."; } identity network-functions-isolation { base logical-isolation; description "NF (Network Function) is dedicated to the network slice, but virtual resources are shared."; } identity service-isolation { base logical-isolation; description "NSC data are isolated from other NSCs, but virtual resources and NFs are shared."; } /* * Groupiings */ grouping network-slice-topology-attributes { description "Network Slice topology scope attributes."; container network-slice { description "Containing Network Slice attributes."; leaf optimization-criterion { type identityref { base te-types:objective-function-type; } description "Optimization criterion applied to this topology."; } leaf delay-tolerance { type boolean; description "'true' if is not too critical how long it takes to deliver the amount of data."; reference "GSMA-NS-Template: Generic Network Slice Template, Version 3.0."; } Liu, et al. Expires May 6, 2021 [Page 13] Internet-Draft IETF Network Slice YANG Model November 2020 leaf-list periodicity { type uint64; units seconds; description "A list of periodicities supported by the network slice."; reference "GSMA-NS-Template: Generic Network Slice Template, Version 3.0."; } leaf isolation-level { type identityref { base isolation-level; } description "A network slice instance may be fully or partly, logically and/or physically, isolated from another network slice instance. This attribute describes different types of isolation:"; } } // network-slice } // network-slice-topology-attributes grouping network-slice-node-attributes { description "Network Slice node scope attributes."; container network-slice { description "Containing Network Slice attributes."; leaf isolation-level { type identityref { base isolation-level; } description "A network slice instance may be fully or partly, logically and/or physically, isolated from another network slice instance. This attribute describes different types of isolation:"; } leaf compute-node-id { type string; description "Reference to a compute node instance specified in a data model specifying the computing resources."; } leaf storage-id { type string; description "Reference to a storage instance specified in a data model specifying the storage resources."; Liu, et al. Expires May 6, 2021 [Page 14] Internet-Draft IETF Network Slice YANG Model November 2020 } } // network-slice } // network-slice-node-attributes grouping network-slice-link-attributes { description "Network Slice link scope attributes"; container network-slice { description "Containing Network Slice attributes."; leaf delay-tolerance { type boolean; description "'true' if is not too critical how long it takes to deliver the amount of data."; reference "GSMA-NS-Template: Generic Network Slice Template, Version 3.0."; } leaf-list periodicity { type uint64; units seconds; description "A list of periodicities supported by the network slice."; reference "GSMA-NS-Template: Generic Network Slice Template, Version 3.0."; } leaf isolation-level { type identityref { base isolation-level; } description "A network slice instance may be fully or partly, logically and/or physically, isolated from another network slice instance. This attribute describes different types of isolation:"; } } // network-slice } // network-slice-link-attributes /* * Data nodes */ augment "/nw:networks/nw:network/nw:network-types" { description "Defines the Network Slice topology type."; container network-slice { presence "Indicates Network Slice topology"; Liu, et al. Expires May 6, 2021 [Page 15] Internet-Draft IETF Network Slice YANG Model November 2020 description "Its presence identifies the Network Slice type."; } } augment "/nw:networks/nw:network" { when "nw:network-types/ns:network-slice" { description "Augment only for Network Slice topology."; } description "Augment topology configuration and state."; uses network-slice-topology-attributes; } augment "/nw:networks/nw:network/nw:node" { when "../nw:network-types/ns:network-slice" { description "Augment only for Network Slice topology."; } description "Augment node configuration and state."; uses network-slice-node-attributes; } augment "/nw:networks/nw:network/nt:link" { when "../nw:network-types/ns:network-slice" { description "Augment only for Network Slice topology."; } description "Augment link configuration and state."; uses network-slice-link-attributes; } } 6. IANA Considerations RFC Ed.: In this section, replace all occurrences of 'XXXX' with the actual RFC number (and remove this note). This document registers the following namespace URIs in the IETF XML registry [RFC3688]: -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-network-slice Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- Liu, et al. Expires May 6, 2021 [Page 16] Internet-Draft IETF Network Slice YANG Model November 2020 This document registers the following YANG modules in the YANG Module Names registry [RFC6020]: -------------------------------------------------------------------- name: ietf-l3-te-topology namespace: urn:ietf:params:xml:ns:yang:ietf-network-slice prefix: ns reference: RFC XXXX -------------------------------------------------------------------- 7. 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 Network Configuration Access Control Model (NACM) [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. There are a number of data nodes defined in this YANG module that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability: /nw:networks/nw:network/nw:network-types/ns:network-slice This subtree specifies the network slice type. Modifying the configurations can make network slice type invalid and cause interruption to IETF network slices. /nw:networks/nw:network/ns:network-slice This subtree specifies the topology-wide configurations. Modifying the configurations here can cause traffic characteristics changed in this IETF network slice and related networks. /nw:networks/nw:network/nw:node/ns:network-slice This subtree specifies the configurations of the nodes in a IETF network slice. Modifying the configurations in this subtree can Liu, et al. Expires May 6, 2021 [Page 17] Internet-Draft IETF Network Slice YANG Model November 2020 change the traffic characteristics on this node and the related networks. /nw:networks/nw:network/nt:link/ns:network-slice This subtree specifies the configurations of the links in a IETF network slice. Modifying the configurations in this subtree can change the traffic characteristics on this link and the related networks. Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: /nw:networks/nw:network/nw:network-types/ns:network-slice Unauthorized access to this subtree can disclose the network slice type. /nw:networks/nw:network/ns:network-slice Unauthorized access to this subtree can disclose the topology-wide states. /nw:networks/nw:network/nw:node/ns:network-slice Unauthorized access to this subtree can disclose the operational state information of the nodes in a IETF network slice. /nw:networks/nw:network/nt:link/ns:network-slic Unauthorized access to this subtree can disclose the operational state information of the links in a IETF network slice. 8. Acknowledgements The TEAS Network Slicing Design Team (NSDT) members included Aijun Wang, Dong Jie, Eric Gray, Jari Arkko, Jeff Tantsura, John E Drake, Luis M. Contreras, Rakesh Gandhi, Ran Chen, Reza Rokui, Ricard Vilalta, Ron Bonica, Sergio Belotti, Tomonobu Niwa, Xuesong Geng, and Xufeng Liu. 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Liu, et al. Expires May 6, 2021 [Page 18] Internet-Draft IETF Network Slice YANG Model November 2020 [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [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, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [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, . [RFC8345] Clemm, A., Medved, J., Varga, R., Bahadur, N., Ananthakrishnan, H., and X. Liu, "A YANG Data Model for Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March 2018, . Liu, et al. Expires May 6, 2021 [Page 19] Internet-Draft IETF Network Slice YANG Model November 2020 [RFC8346] Clemm, A., Medved, J., Varga, R., Liu, X., Ananthakrishnan, H., and N. Bahadur, "A YANG Data Model for Layer 3 Topologies", RFC 8346, DOI 10.17487/RFC8346, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [RFC8776] Saad, T., Gandhi, R., Liu, X., Beeram, V., and I. Bryskin, "Common YANG Data Types for Traffic Engineering", RFC 8776, DOI 10.17487/RFC8776, June 2020, . [RFC8795] Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and O. Gonzalez de Dios, "YANG Data Model for Traffic Engineering (TE) Topologies", RFC 8795, DOI 10.17487/RFC8795, August 2020, . [GSMA-NS-Template] GSM Association, "Generic Network Slice Template, Version 3.0", NG.116, May 2020. [I-D.nsdt-teas-ietf-network-slice-definition] Rokui, R., Homma, S., Makhijani, K., Contreras, L., and J. Tantsura, "Definition of IETF Network Slices", draft-nsdt- teas-ietf-network-slice-definition-00 (work in progress), October 2020. 9.2. Informative References [RFC7951] Lhotka, L., "JSON Encoding of Data Modeled with YANG", RFC 7951, DOI 10.17487/RFC7951, August 2016, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8453] Ceccarelli, D., Ed. and Y. Lee, Ed., "Framework for Abstraction and Control of TE Networks (ACTN)", RFC 8453, DOI 10.17487/RFC8453, August 2018, . Liu, et al. Expires May 6, 2021 [Page 20] Internet-Draft IETF Network Slice YANG Model November 2020 [I-D.ietf-ccamp-otn-topo-yang] Zheng, H., Busi, I., Liu, X., Belotti, S., and O. Dios, "A YANG Data Model for Optical Transport Network Topology", draft-ietf-ccamp-otn-topo-yang-11 (work in progress), September 2020. [I-D.ietf-i2rs-yang-l2-network-topology] Dong, J., Wei, X., WU, Q., Boucadair, M., and A. Liu, "A YANG Data Model for Layer 2 Network Topologies", draft- ietf-i2rs-yang-l2-network-topology-18 (work in progress), September 2020. [I-D.ietf-teas-actn-yang] Lee, Y., Zheng, H., Ceccarelli, D., Yoon, B., Dios, O., Shin, J., and S. Belotti, "Applicability of YANG models for Abstraction and Control of Traffic Engineered Networks", draft-ietf-teas-actn-yang-06 (work in progress), August 2020. [I-D.nsdt-teas-ns-framework] Gray, E. and J. Drake, "Framework for Transport Network Slices", draft-nsdt-teas-ns-framework-04 (work in progress), July 2020. Liu, et al. Expires May 6, 2021 [Page 21] Internet-Draft IETF Network Slice YANG Model November 2020 Appendix A. Data Tree for the Example in Section 3.1. A.1. Native Topology This section contains an example of an instance data tree in the JSON encoding [RFC7951]. The example instantiates "ietf-network" for the native topology depicted in Figure 3. { "ietf-network:networks": { "network": [ { "network-id":"example-native-topology", "network-types": { }, "node": [ { "node-id":"R1", "ietf-network-topology:termination-point": [ { "tp-id":"1-0-1" }, { "tp-id":"1-0-2" }, { "tp-id":"1-2-1" }, { "tp-id":"1-2-2" } ] }, { "node-id":"R2", "ietf-network-topology:termination-point": [ { "tp-id":"2-1-1" }, { "tp-id":"2-1-2" }, { "tp-id":"2-3-1" }, { "tp-id":"2-4-1" } Liu, et al. Expires May 6, 2021 [Page 22] Internet-Draft IETF Network Slice YANG Model November 2020 ] }, { "node-id":"R3", "ietf-network-topology:termination-point": [ { "tp-id":"3-0-1" }, { "tp-id":"3-2-1" } ] }, { "node-id":"R4", "ietf-network-topology:termination-point": [ { "tp-id":"4-0-1" }, { "tp-id":"4-2-1" } ] } ], "ietf-network-topology:link": [ { "link-id":"R1,1-0-1,,", "source": { "source-node":"R1", "source-tp":"1-0-1" } }, { "link-id":",,R1,1-0-1", "destination": { "dest-node":"R1", "dest-tp":"1-0-1" } }, { "link-id":"R1,1-0-2,,", "source": { "source-node":"R1", "source-tp":"1-0-2" } }, { Liu, et al. Expires May 6, 2021 [Page 23] Internet-Draft IETF Network Slice YANG Model November 2020 "link-id":",,R1,1-0-2", "destination": { "dest-node":"R1", "dest-tp":"1-0-2" } }, { "link-id":"R1,1-2-1,R2,2-1-1", "source": { "source-node":"R1", "source-tp":"1-2-1" }, "destination": { "dest-node":"R2", "dest-tp":"2-1-1" } }, { "link-id":"R2,2-1-1,R1,1-2-1", "source": { "source-node":"R2", "source-tp":"2-1-1" }, "destination": { "dest-node":"R1", "dest-tp":"1-2-1" } }, { "link-id":"R1,1-2-2,R2,2-1-2", "source": { "source-node":"R1", "source-tp":"1-2-2" }, "destination": { "dest-node":"R2", "dest-tp":"2-1-2" } }, { "link-id":"R2,2-1-2,R1,1-2-2", "source": { "source-node":"R2", "source-tp":"2-1-2" }, "destination": { "dest-node":"R1", "dest-tp":"1-2-2" Liu, et al. Expires May 6, 2021 [Page 24] Internet-Draft IETF Network Slice YANG Model November 2020 } }, { "link-id":"R2,2-3-1,R3,3-2-1", "source": { "source-node":"R2", "source-tp":"2-3-1" }, "destination": { "dest-node":"R3", "dest-tp":"3-2-1" } }, { "link-id":"R3,3-2-1,R2,2-3-1", "source": { "source-node":"R3", "source-tp":"3-2-1" }, "destination": { "dest-node":"R2", "dest-tp":"2-3-1" } }, { "link-id":"R2,2-4-1,R4,4-2-1", "source": { "source-node":"R2", "source-tp":"2-4-1" }, "destination": { "dest-node":"R4", "dest-tp":"4-2-1" } }, { "link-id":"R4,4-2-1,R2,2-4-1", "source": { "source-node":"R4", "source-tp":"4-2-1" }, "destination": { "dest-node":"R2", "dest-tp":"2-4-1" } }, { "link-id":"R3,3-0-1,,", Liu, et al. Expires May 6, 2021 [Page 25] Internet-Draft IETF Network Slice YANG Model November 2020 "source": { "source-node":"R3", "source-tp":"3-0-1" } }, { "link-id":",,R3,3-0-1", "destination": { "dest-node":"R3", "dest-tp":"3-0-1" } }, { "link-id":"R4,4-0-1,,", "source": { "source-node":"R4", "source-tp":"4-0-1" } }, { "link-id":",,R4,4-0-1", "destination": { "dest-node":"R4", "dest-tp":"4-0-1" } } ] } ] } } A.2. Network Slice Blue This section contains an example of an instance data tree in the JSON encoding [RFC7951]. The example instantiates "ietf-network-slice" for the topology customized for Network Slice Blue depicted in Figure 3. { "ietf-network:networks": { "network": [ { "network-id":"example-customized-blue-topology", "network-types": { "ietf-network-slice:network-slice": { Liu, et al. Expires May 6, 2021 [Page 26] Internet-Draft IETF Network Slice YANG Model November 2020 } }, "supporting-network": [ { "network-ref":"example-native-topology" } ], "node": [ { "node-id":"VR1", "supporting-node": [ { "network-ref":"example-native-topology", "node-ref":"R1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-memory-isolation" }, "ietf-network-topology:termination-point": [ { "tp-id":"1-0-1" }, { "tp-id":"1-3-1" } ] }, { "node-id":"VR3", "supporting-node": [ { "network-ref":"example-native-topology", "node-ref":"R2" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-memory-isolation" }, "ietf-network-topology:termination-point": [ { "tp-id":"3-1-1" }, { "tp-id":"3-5-1" } Liu, et al. Expires May 6, 2021 [Page 27] Internet-Draft IETF Network Slice YANG Model November 2020 ] }, { "node-id":"VR5", "supporting-node": [ { "network-ref":"example-native-topology", "node-ref":"R3" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-memory-isolation" }, "ietf-network-topology:termination-point": [ { "tp-id":"5-3-1" }, { "tp-id":"5-0-1" } ] } ], "ietf-network-topology:link": [ { "link-id":"VR1,1-0-1,,", "source": { "source-node":"VR1", "source-tp":"1-0-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R1,1-0-1,," } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":",,VR1,1-0-1", "destination": { "dest-node":"VR1", "dest-tp":"1-0-1" }, Liu, et al. Expires May 6, 2021 [Page 28] Internet-Draft IETF Network Slice YANG Model November 2020 "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":",,R1,1-0-1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":"VR1,1-3-1,VR3,3-1-1", "source": { "source-node":"VR1", "source-tp":"1-3-1" }, "destination": { "dest-node":"VR3", "dest-tp":"3-1-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R1,1-2-1,R2,2-1-1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":"VR3,3-1-1,VR1,1-3-1", "source": { "source-node":"VR3", "source-tp":"3-1-1" }, "destination": { "dest-node":"R1", "dest-tp":"1-3-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R2,2-1-1,R1,1-2-1" } ], Liu, et al. Expires May 6, 2021 [Page 29] Internet-Draft IETF Network Slice YANG Model November 2020 "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":"VR3,3-5-1,VR5,5-3-1", "source": { "source-node":"VR3", "source-tp":"3-5-1" }, "destination": { "dest-node":"VR5", "dest-tp":"5-3-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R2,2-3-1,R3,3-2-1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":"VR5,5-3-1,VR3,3-5-1", "source": { "source-node":"VR5", "source-tp":"5-3-1" }, "destination": { "dest-node":"VR3", "dest-tp":"3-5-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R3,3-2-1,R2,2-3-1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { Liu, et al. Expires May 6, 2021 [Page 30] Internet-Draft IETF Network Slice YANG Model November 2020 "link-id":"VR5,5-0-1,,", "source": { "source-node":"VR5", "source-tp":"5-0-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":"R3,3-0-1,," } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } }, { "link-id":",,VR5,5-0-1", "destination": { "dest-node":"VR5", "dest-tp":"5-0-1" }, "supporting-link": [ { "network-ref":"example-native-topology", "link-ref":",,R3,3-0-1" } ], "ietf-network-slice:network-slice": { "isolation-level": "ietf-network-slice:physical-network-isolation" } } ], "ietf-network-slice:network-slice": { "optimization-criterion": "ietf-te-types:of-minimize-cost-path", "isolation-level": "ietf-network-slice:physical-isolation" } } ] } } Liu, et al. Expires May 6, 2021 [Page 31] Internet-Draft IETF Network Slice YANG Model November 2020 Authors' Addresses Xufeng Liu Volta Networks EMail: xufeng.liu.ietf@gmail.com Jeff Tantsura Apstra Networks EMail: jefftant.ietf@gmail.com Igor Bryskin Individual EMail: i_bryskin@yahoo.com Luis Miguel Contreras Murillo Telefonica EMail: luismiguel.contrerasmurillo@telefonica.com Qin Wu Huawei EMail: bill.wu@huawei.com Sergio Belotti Nokia EMail: sergio.belotti@nokia.com Reza Rokui Nokia Canada EMail: reza.rokui@nokia.com Liu, et al. Expires May 6, 2021 [Page 32]