CATS Working Group H. Yao Internet Draft China Mobile Intended status: Standards Track C. Lin Expires: December 25, 2024 New H3C Technologies June 26, 2024 Data Model for Computing-Aware Traffic Steering (CATS) draft-yl-cats-data-model-00 Abstract This document defines a YANG data model for the configuration and management of Computing-Aware Traffic Steering (CATS) framework. 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 December 25, 2024. Copyright Notice Copyright (c) 2024 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. yl, et al. Expires December 25, 2024 [Page 1] Internet-Draft YANG Data Model for CATS June 2024 Table of Contents 1. Introduction...................................................3 1.1. Terminology...............................................3 1.2. Conventions Used in This Document.........................3 1.3. Tree Diagrams.............................................3 1.4. Prefixes in Data Node Names...............................3 2. Design of the Configuration Data Model.........................4 2.1. Scope of Model............................................4 2.2. Specification.............................................4 2.3. Overview..................................................4 2.4. CATS Control plane YANG Attributes........................8 2.4.1. CATS base............................................8 2.4.2. CATS traffic-classifier..............................9 2.4.3. CATS service-metric..................................9 2.4.4. CATS notify.........................................10 2.5. CATS Forwarding plane YANG Attributes....................10 2.5.1. CATS forwarding-paths...............................10 2.5.2. CATS Flow Entry.....................................11 3. YANG Data model...............................................12 4. Security Considerations.......................................21 5. IANA Considerations...........................................21 6. References....................................................21 6.1. Normative References.....................................21 6.2. Informative References...................................22 Contributors.....................................................22 Authors' Addresses...............................................22 yl, et al. Expires December 25, 2024 [Page 2] Internet-Draft YANG Data Model for CATS June 2024 1. Introduction [I-D. draft-ietf-cats-framework] introduces the framework definition of CATS. This document defines a YANG data model for CATS that can be used to configure and manage the CATS framework. This model imports and augments ietf-routing YANG model defined in [RFC8349]. 1.1. Terminology This document makes use of the terms as defined in [I-D. draft-ietf- cats-framework]. 1.2. Conventions Used in This Document 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. 1.3. Tree Diagrams Tree diagrams used in this document follow the notation defined in [RFC8340]. 1.4. Prefixes in Data Node Names In this document, names of data nodes, actions, and other data model objects are often used without a prefix, as long as it is clear from the context in which YANG module each name is defined. Otherwise, names are prefixed using the standard prefix associated with the corresponding YANG module, as shown in Table 1. +--------+-------------------------+-------------+ | Prefix | YANG module | Reference | +--------+-------------------------+-------------+ | if | ietf-interfaces | [RFC8343] | | ip | ietf-ip | [RFC8344] | | cats | ietf-cats | Section 3 | | yang | ietf-yang-types | [RFC6991] | | inet | ietf-inet-types | [RFC6991] | +--------+-------------------------+-------------+ Table 1: Prefixes and Corresponding YANG Modules yl, et al. Expires December 25, 2024 [Page 3] Internet-Draft YANG Data Model for CATS June 2024 2. Design of the Configuration Data Model 2.1. Scope of Model The model covers CATS [I-D. draft-ietf-cats-framework]. This model can be used to configure and manage the CATS framework. The operational state data and statistics can be retrieved by this model. The subscription and push mechanism defined in [RFC8639] and [RFC8641] can be implemented by the user to subscribe to notifications on the data nodes in this model. The model contains all the basic configuration parameters to operate the protocol. Depending on the implementation choices, some systems may not allow some of the advanced parameters to be configurable. The occasionally implemented parameters are modeled as optional features in this model. This model can be extended, and it has been structured in a way that such extensions can be conveniently made. 2.2. Specification This model imports and augments ietf-routing YANG model defined in [RFC8349]. Both configuration branch and state branch of [RFC8349] are augmented. The configuration branch covers node base and policy configuration. The container "cats" is the top level container in this data model. The YANG data model defined in this document conforms to the Network Management Datastore Architecture (NMDA) [RFC8342]. The operational state data is combined with the associated configuration data in the same hierarchy [RFC8407]. 2.3. Overview As shown in Figure 1, the CATS framework structure consists of C- SMA, responsible for maintaining service metrics, C-PCE, responsible for maintaining forwarding table entries, and C-TC, responsible for traffic classification. CATS-SBI: It could be used to report computing servcie information from CATS routers to the CATS-control center, and also could be used to send path and service policy information or computing service information to CATS-Forwarders. C-SMA API: An extended interface between the CATS-Forwarders and the cloud management or between CATS-Forwarders and service-instance, yl, et al. Expires December 25, 2024 [Page 4] Internet-Draft YANG Data Model for CATS June 2024 it is used to report computing service metric information to the CATS-control center or to CATS-Forwarders. This document defines a YANG data model for the configuration and management of CATS corresponding data. The data model is applicable to CATS-SBI interface and C-SMA API interface. The CATS YANG is divided into two parts: the control-plane YANG data and the forwarding-plane YANG. The control-plane YANG includes basic YANG, traffic-classifier YANG, and service-metric YANG. The forwarding-plane YANG includes forwarding-paths YANG and flow YANG. o The CATS base table provides interfaces for the functionality of the C-PCE component, which can be used for communication interfaces between the CATS-Control center and the cloud management platform, as well as for interfaces between the CATS- Control center and the CATS-Forwarder. o The CATS traffic-classifier table provides interfaces for the functionality of the C-TC component, which can be used for interfaces between the CATS-Control center and the CATS- Forwarder. o The CATS service-metric table provides interfaces for the CATS SMA component, which can be used for interfaces between the CATS- Control center and the CATS-Forwarder, as well as for transmitting service metrics information from the cloud management platform to the CATS-Control center. It is also used for forwarding service metric information from the CATS-Control center to the CATS-Forwarder. o The CATS notify table is used by the management layer component and can be utilized for the CATS-forwarder to report events to the CATS-control center. o The CATS Forwarding-Path table and the CATS Flow-Entry table can be used as interfaces for the CATS-Control center to distribute forwarding table entries to the CATS Forwarder, and they can also be utilized for the CATS Forwarder to report traffic statistics information to the CATS-Control center. o The CATS-Control center can directly distribute specific CATS Flow-Entry to the CATS-Forwarder for guiding forwarding. It can also distribute CATS Forwarding-Path table and CATS traffic- classifier table to the CATS-Forwarder, allowing the CATS- Forwarder to proactively select paths according to forwarding policies and generate the CATS Flow-Entry table. yl, et al. Expires December 25, 2024 [Page 5] Internet-Draft YANG Data Model for CATS June 2024 CATS-control center +----------------------------------+ +----------+ | Management | C-SMA API |cloud | | Plane +------+----------+ |<============>|management| | | | | | |platform | | | +--v---+ +--v---+ | +------+---+ | | |C-CIB | |C-NIB | | | | | +---^--+ +--^---+ | | | | | | | | +---------|-------|---------|------+ | | Control | +---v--+ +--v---+ | | | Plane | |C-SMA | |C-NMA | | | | | +------+ +------+ | | | | | | | | +-------+ | | | +-->| C-PCE | | | | +-------+ | | +----------------------------------+ | /\ CATS-SBI /\ CATS-SBI | || || | CATS-Forwarder1 \/ CATS-Forwarder2 \/ | +-------------------+ +--------------------------------+ C-SMA | | Device +------+ | | Device +-----+-------+ | API +--------+ | Plane |C-TC | | | Plane |C-TC |C-PS | |<========>| +--------+ | +------+ | | +-----+---+---+ | | |service | +-------------------+ | | | +-|instance| | +------+---+ | +--------+ | | | | | +--+---+ +-+----+ | | |C-SMA | |C-NMA | | | +------+ +------+ | +--------------------------------+ Figure 1: CATS System Arhicteture yl, et al. Expires December 25, 2024 [Page 6] Internet-Draft YANG Data Model for CATS June 2024 module: ietf-cats +--rw cats | +--rw base | | +--rw enable bool | | +--rw update-interval uint | | +--rw metric-limits uint64 | | +--rw flow-limits uint64 | | +--rw flow-timeout uint | | +--rw service-policy | | +--rw cs-id index, type cs-id | | +--rw policy-type enumeration | | | +--rw traffic-classifiers | | +--rw traffic-classifier | | +--rw cs-id index, type cs-id | | +--rw description string | | +--rw server-port ushort | | +--rw protocol ushort | | | +--rw service-metrics | | +--rw service-metric | | +--rw cs-id index, cs-id | | +--rw cis-id index, cis-id | | +--rw source-type index, uint | | +--rw priority uint | | +--rw affinity uint | | +--rw location inet:ip-address | | +--rw metric | | +--metric-type index, type uint | | +--metric uint | | | +--rw forwarding-paths | | +--rw forwarding-path | | +--rw cs-id index, type cs-id | | +--rw cis-id index, type cis-id | | +--rw policy-type enumeration | | +--rw weight uint32 | | +--rw forwarding-path-state | | +--rw path-id index, type uint8 | | +--rw next-hop-address inet:ip-address | | +--rw interface if:interface | | +--rw dataplanetype | | | +--rw flow-entrys | | +--rw flow-entry | | +--rw source-address index, inet:ip-address | | +--rw dest-address index, inet:ip-address | | +--rw source-port index, inet:ip-address yl, et al. Expires December 25, 2024 [Page 7] Internet-Draft YANG Data Model for CATS June 2024 | | +--rw dest-port index, inet:ip-address | | +--rw protocol index, ushort | | +--rw forwarding-path | | +--rw cs-id type cs-id | | +--rw cis-id type cis-id | | +--rw affinity type uint | | +--rw forwarding-path-state | | +--rw path-id index, type uint8 | | +--rw next-hop-address inet:ip-address | | +--rw interface if:interface | | +--rw dataplanetype | | | | +--ro flow-statistics | | +--ro pkts uint64 | | +--ro octets uint64 | | | +--n notify | | +--ro metric-limit-reached boolean | | +--ro flow-limit-reached boolean Figure 2: Yang Organization and Hierarchy 2.4. CATS Control plane YANG Attributes 2.4.1. CATS base | +--rw base | | +--rw enable bool | | +--rw update-interval uint | | +--rw metric-limits uint64 | | +--rw flow-limits uint64 | | +--rw flow-timeout uint | | +--rw service-policy | | +--rw cs-id index, type cs-id | | +--rw policy-type enumeration Figure 3: Base configuration tree view In the base, you can set the "enable" attribute to enable/disable CATS function. yl, et al. Expires December 25, 2024 [Page 8] Internet-Draft YANG Data Model for CATS June 2024 you can set the "cats-update-interval" parameter to determine the interval at which C-SMA notifies C-PS of metric changes. The default value for this interval is 30 seconds. You can set the maximum number of table entries by configuring "entry-limits". You can set the maximum number of flow tables by configuring "flow- limits". When flow tables have been inactive for a long period of time, it is necessary to age out the stale state entries. This can be achieved by configuring "flow-timeout" to control the aging time of flow tables. You can set the service-policy table for traffic routing, which includes affinity-based, service-metric-based, network-metric-based, and combined service-metric and network-metric-based routing. 2.4.2. CATS traffic-classifier | +--rw traffic-classifiers | | +--rw traffic-classifier | | +--rw cs-id index,type cs-id | | +--rw description string | | +--rw server-port ushort | | +--rw protocol ushort Figure 4: traffic-classifier tree view The cats traffic-classifier table is used to define the features of the service and to classify the traffic. 2.4.3. CATS service-metric | +--rw service-metrics | | +--rw cats-service-metric | | +--rw cs-id index, type cs-id | | +--rw cis-id index, type cis-id | | +--rw source-type index, source-type | | +--rw priority uint | | +--rw affinity uint | | +--rw location inet:ip-address | | +--rw metric | | +--metric-type index, type uint | | +--metric uint yl, et al. Expires December 25, 2024 [Page 9] Internet-Draft YANG Data Model for CATS June 2024 Figure 5: Service-metric tree view The cats service-metric table is used to control the delivery service metrics on the control plane, thereby generating the forwarding table on the forwarding plane in conjunction with network metrics. 2.4.4. CATS notify | +--n notify | | +--ro entry-limit-reached boolean | | +--ro flow-limit-reached boolean Figure 6: Notify tree view When the number of cats table entries reaches the maximum and when the number of entries goes from maximum to not being maximum, a event notification will be sent indicating the change in the number of cats table entries reaching the maximum. 2.5. CATS Forwarding plane YANG Attributes 2.5.1. CATS forwarding-paths | +--rw forwarding-paths | | +--rw forwarding-path | | +--rw cs-id index, type cs-id | | +--rw cis-id index, type cis-id | | +--rw policy-type enumeration | | +--rw weight uint32 | | +--rw forwarding-path-state | | +--rw path-id index, type uint8 | | +--rw forwarding-path-info | | +--rw next-hop-address inet:ip-address | | +--rw interface if:interface | | +--rw dataplanetype Figure 7: Forwarding-path tree view yl, et al. Expires December 25, 2024 [Page 10] Internet-Draft YANG Data Model for CATS June 2024 The cats forwarding-paths table is used for forwarding service traffic on the data plane. In scenarios with multiple paths, load balancing can be achieved based on the assigned weights. 2.5.2. CATS Flow Entry | +--rw flow-entrys | | +--rw flow-entry | | +--rw source-address index, inet:ip-address | | +--rw dest-address index, inet:ip-address | | +--rw source-port index, inet:ip-address | | +--rw dest-port index, inet:ip-address | | +--rw protocol index, ushort | | +--rw forwarding-path | | +--rw cs-id type cs-id | | +--rw cis-id type cis-id | | +--rw affinity type uint | | +--rw forwarding-path-info | | +--rw next-hop-address inet:ip-address | | +--rw interface if:interface | | +--rw dataplanetype | | | | +--ro flow-statistics | | +--ro pkts uint64 | | +--ro octets uint64 Figure 8: Flow-entry tree view When there is service traffic, Ingress CATS-Forwarder maintains a flow table to guide the forwarding of this flow. If the flow table remains in a stale state for more than flow-timeout, it will be deleted. The flow table also includes statistical information related to this flow. yl, et al. Expires December 25, 2024 [Page 11] Internet-Draft YANG Data Model for CATS June 2024 3. YANG Data model file ietf-cats@2024-06-20.yang module ietf-cats { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-cats"; prefix ietf-cats; import ietf-inet-types { prefix inet; reference "RFC 6991 Common YANG Data Types"; } import ietf-routing-types { prefix "rt-types"; } import ietf-srv6-types { prefix "srv6-types"; } import ietf-interfaces { prefix if; } organization "IETF CATS"; contact "WG Web: WG List: "; description "This module describes a YANG model for CATS. This YANG model conforms to the Network Management Datastore Architecture (NMDA) as described in RFC 8342. Copyright (c) 2024 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 Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (httpstrustee.ietf.orglicense-info). yl, et al. Expires December 25, 2024 [Page 12] Internet-Draft YANG Data Model for CATS June 2024 This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices. 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 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; revision 2024-06-20 { description "Initial Version"; reference "RFC XXXX: YANG Data Model for CATS"; } typedef cs-id { type union { type uint32; type inet:ipv4-address; type inet:ipv6-address; } description "This type is for CATS CS-ID."; } typedef cis-id { type union { type uint32; type inet:ipv4-address; type inet:ipv6-address; } description "This type is for CATS CIS-ID."; } grouping service-policy-type { description "service policy type"; leaf policy-type { description "service policy type"; type enumeration { enum base-on-affinity { value 0; description "base on affinity"; } yl, et al. Expires December 25, 2024 [Page 13] Internet-Draft YANG Data Model for CATS June 2024 enum base-on-sm-only { value 1; description "base on service metric only"; } enum base-on-sm-nm { value 2; description "base on service metric and network metric"; } } } } container base { description "CATS base configuration."; leaf enable { type boolean; description "enable CATS" } leaf update-interval { type uint32; description "update-interval of CATS metric"; } leaf entry-limits { type uint64; description "CATS metric entry limit"; } leaf flow-limits { type uint64; description "CATS flow entry limit"; } leaf flow-timeout { type uint32; description "CATS flow timeout when no flow"; } container service-policy { description "CATS sercice policy"; leaf cs-id { type cs-id; description "cs-id"; } yl, et al. Expires December 25, 2024 [Page 14] Internet-Draft YANG Data Model for CATS June 2024 uses service-policy-type; } } container traffic-classifiers { description "CATS traffic-classifier feature"; list traffic-classifier { description "CATS traffic-classifier feature"; key "cs-id"; leaf cs-id { type cs-id; description "CATS CIS-ID"; } leaf description { type string; description "description of this service, example: http"; } leaf server-port { type uint16; description "server-port of the service."; } leaf protocol { type uint16; description "protocol of the service."; } } } container service-metrics { description "CATS service metric entry"; list service-metric { description "CATS service metric entry"; key "cs-id cis-id source-type"; leaf cs-id { type cs-id; description "CATS cs-id"; } leaf cis-id { type cis-id; yl, et al. Expires December 25, 2024 [Page 15] Internet-Draft YANG Data Model for CATS June 2024 description "CATS cis-id"; } leaf source-type { description "source-type of the service-metric"; type enumeration { enum static { value 0; description "static configuration"; } enum bgp { value 1; description "bgp protocol"; } } } leaf priority { type uint32; description "server priority"; } leaf affinity { type uint32; description "server affinity"; } leaf location { type inet:ip-address; description "server location"; } container service-metric { description "service metric"; list metric { description "Different types of service "; key "metric-type"; leaf metric-type { description "metric type"; type enumeration { enum delay { value 0; description " Calculate the metric based on transmission delay, where the metric value is the delay time in milliseconds."; } enum service-ratio { yl, et al. Expires December 25, 2024 [Page 16] Internet-Draft YANG Data Model for CATS June 2024 value 1; description "Calculate the metric based on business capacity, where the metric value is the current capacity percentage."; } enum memory-ratio { value 2; description " Calculate the metric based on memory utilization percentage, where the metric value is the current memory utilization percentage"; } } } leaf metric { type uint32; description "metric value"; } } } } } grouping mpls-label-stack { description "Grouping for MPLS label stack"; list labels { key "index"; description "Stack containing MPLS labels"; leaf index { type uint32; description "A unique ID of an MPLS label in labels list"; } leaf label { type rt-types:mpls-label; description "MPLS label value"; } } } grouping srv6-sid-stack { description yl, et al. Expires December 25, 2024 [Page 17] Internet-Draft YANG Data Model for CATS June 2024 "Grouping for SRv6 label stack"; list sids { key "index"; description "Stack containing SRv6 SIDs"; leaf index { type uint32; description "A unique ID of an SRv6 sid in sid list"; } leaf sid { type srv6-types:srv6-sid; description "SRv6 sid value"; } } } grouping path-forwarding-info { leaf next-hop-address { type inet:ip-address; description "Nexthop address"; } leaf interface { type if:interface-ref; description "Outgoing interface handle"; } container sid-list { description "Outgoing sid stack"; choice dataplanetype { description "Outgoing sids dataplane choice"; case mpls { uses mpls-label-stack; } case srv6 { uses srv6-sid-stack; } } } grouping path-forwarding-state { description "cats Forwarding path information"; leaf path-id { type uint8; description "Primary path id"; } yl, et al. Expires December 25, 2024 [Page 18] Internet-Draft YANG Data Model for CATS June 2024 uses path-forwarding-info; } } container forwarding-paths { description "Forwarding state of paths"; list forwarding-path { description "Forwarding state of paths"; key "cs-id cis-id"; leaf cs-id { type cs-id; description "CATS cs-id"; } leaf cis-id { type cis-id; description "CATS cis-id"; } uses service-policy-type; leaf weight { type uint32; description "Path's weight for W-ECMP balancing"; } list forwarding-path-state { key "path-id"; description "Forwarding path state"; uses path-forwarding-state; } } } container flow-entrys { description "flow entry"; list flow-entry { description "flow entry"; key "source-address dest-address source-port dest-port protocol"; leaf source-address { type inet:ip-address; description "source address of flow"; } leaf dest-address { type inet:ip-address; description "destination address of flow"; } leaf source-port { type uint16; description "source port of flow"; yl, et al. Expires December 25, 2024 [Page 19] Internet-Draft YANG Data Model for CATS June 2024 } leaf dest-port { type uint16; description "destination port of flow"; } leaf protocol { type uint16; description "protocol of flow"; } leaf cs-id { type cs-id; description "CATS cs-id"; } leaf cis-id { type cis-id; description "CATS cis-id"; } leaf affinity { type uint32; description "affinity"; } uses path-forwarding-info; container flow-statistics { description "flow statistics"; leaf pkts { type uint64; description "pkts"; } leaf octets { type uint64; description "octets"; } } } } container notify { description "event notify"; leaf entry-limit-reached { type boolean; description "entry limit reached"; } leaf flow-limit-reached { type boolean; description "flow entry limit reached"; } } } yl, et al. Expires December 25, 2024 [Page 20] Internet-Draft YANG Data Model for CATS June 2024 4. Security Considerations TBD 5. IANA Considerations TBD 6. References 6.1. 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, . [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, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [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, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . [RFC8344] Bjorklund, M., "A YANG Data Model for IP Management", RFC 8344, DOI 10.17487/RFC8344, March 2018, . yl, et al. Expires December 25, 2024 [Page 21] Internet-Draft YANG Data Model for CATS June 2024 6.2. Informative References [I-D. draft-ietf-cats-framework] C. Li.,Z. Du.,M. Boucadair.,L. M. Contreras., J. Drake., " A Framework for Computing-Aware Traffic Steering (CATS)", draft-ietf-cats-framework- 02(work in progress), April 2024. [RFC7895] Bierman, A., Bjorklund, M., and K. Watsen, "YANG Module Library", RFC 7895, DOI 10.17487/RFC7895, June 2016, . [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, . Contributors TBD Authors' Addresses Huijuan Yao China Mobile No.32 XuanWuMen West Street Beijing 100053 China Email: yaohuijuan@chinamobile.com Changwang Lin New H3C Technologies Beijing China Email: linchangwang.04414@h3c.com yl, et al. Expires December 25, 2024 [Page 22]