Network Working Group A.C. Choudhary Internet-Draft Cisco Systems Intended status: Standards Track M. Jethanandani Expires: 7 September 2022 Kloud Services E. Aries Juniper Networks I. Chen The MITRE Corporation 6 March 2022 YANG Models for Quality of Service (QoS) draft-ietf-rtgwg-qos-model-07 Abstract This document describes a YANG model for configuration of Quality of Service (QoS) configuration in network devices. This document doesn't describe QoS statistics counters. 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 7 September 2022. Copyright Notice Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved. Choudhary, et al. Expires 7 September 2022 [Page 1] Internet-Draft YANG Models for QoS March 2022 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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Note to RFC Editor . . . . . . . . . . . . . . . . . . . 3 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Definitions and Acronyms . . . . . . . . . . . . . . . . 3 2. QoS Model Design . . . . . . . . . . . . . . . . . . . . . . 4 3. DiffServ Model Design . . . . . . . . . . . . . . . . . . . . 5 4. Modules Tree Structure . . . . . . . . . . . . . . . . . . . 5 5. Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1. ietf-qos-classifier . . . . . . . . . . . . . . . . . . . 11 5.2. ietf-qos-policy . . . . . . . . . . . . . . . . . . . . . 15 5.3. ietf-qos-action . . . . . . . . . . . . . . . . . . . . . 17 5.4. ietf-qos-target . . . . . . . . . . . . . . . . . . . . . 40 5.5. ietf-diffserv . . . . . . . . . . . . . . . . . . . . . . 42 5.6. ietf-queue-policy . . . . . . . . . . . . . . . . . . . . 52 5.7. ietf-scheduler-policy . . . . . . . . . . . . . . . . . . 55 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 59 7. Security Considerations . . . . . . . . . . . . . . . . . . . 59 8. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 59 9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 59 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 59 10.1. Normative References . . . . . . . . . . . . . . . . . . 59 10.2. Informative References . . . . . . . . . . . . . . . . . 60 Appendix A. Company A, Company B and Company C examples . . . . 61 A.1. Example of Company A Diffserv Model . . . . . . . . . . . 61 A.2. Example of Company B Diffserv Model . . . . . . . . . . . 70 A.3. Example of Company C Diffserv Model . . . . . . . . . . . 84 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 92 1. Introduction This document defines a base YANG [RFC6020] [RFC7950] model for Quality of Service (QoS) configuration parameters. QoS base modules define the basic building blocks to define a classifier, policy, action and target. The base models are augmented to include packet match fields and action parameters to define the Diffrentiated Services (DiffServ) module. Queues and schedulers are stitched as part of diffserv policy model. Separate models have been defined for Choudhary, et al. Expires 7 September 2022 [Page 2] Internet-Draft YANG Models for QoS March 2022 creating Queue policy and Scheduling policy. The DiffServ model is based on DiffServ architecture, and various references have been made to available standard architecture documents. DiffServ is a preferred approach for network service providers to offer services to different customers based on their network Quality- of-Service (QoS) objectives. The traffic streams are differentiated based on DiffServ Code Points (DSCP) carried in the IP header of each packet. The DSCP markings are applied by upstream node or by the edge router on entry to the DiffServ network. The YANG modules in this document conform to the Network Management Datastore Architecture (NMDA) [RFC8342]. Tree diagrams used in this document follow the notation defined in [RFC8340] 1.1. Note to RFC Editor Editorial Note: (To be removed by RFC Editor) This draft contains several placeholder values that need to be replaced with finalized values at the time of publication. Please apply the following replacements: * "XXXX" --> the assigned RFC value for this draft both in this draft and in the yang modules under the revision statement. * The "revision" date in model, in the format XXXX-XX-XX, needs to be updated with the date the draft gets approved. 1.2. 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. 1.3. Definitions and Acronyms This document uses definitions and acronyms defined in Definitions of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers [RFC2474], An Architecture for Differentiated Services [RFC2475], and other documents. Here are some of them. * Classifier: an entity which selects packets based on the content of packet headers according to defined rules. Choudhary, et al. Expires 7 September 2022 [Page 3] Internet-Draft YANG Models for QoS March 2022 * DiffServ: Differentiated Services enhancements to the Internet protocol are intended to enable scalable service discrimination in the Internet without the need for per-flow state and signaling at every hop. A variety of services may be built from a small, well- defined set of building blocks which are deployed in network nodes. * DSCP: Differentiated Services Code Point * Marking: the process of setting the DS codepoint in a packet based on defined rules; pre-marking, re-marking. * Metering: the process of measuring the temporal properties (e.g., rate) of a traffic stream selected by a classifier. The instantaneous state of this process may be used to affect the operation of a marker, shaper, or dropper, and/or may be used for accounting and measurement purposes. * Policing: the process of discarding packets (by a dropper) within a traffic stream in accordance with the state of a corresponding meter enforcing a traffic profile. * RED: Random Early Detection * Shaping: the process of delaying packets within a traffic stream to cause it to conform to some defined traffic profile. * WRED: Weighted Random Early Detection 2. QoS Model Design A classifier consists of packets which may be grouped when a logical set of rules are applied on different packet header fields. The grouping may be based on different values or range of values of same packet header field, presence or absence of some values or range of values of a packet field or a combination thereof. The QoS classifier is defined in the ietf-qos-classifier module. A classifier entry contains one or more packet conditioning functions. A packet conditioning function is typically based on direction of traffic and may drop, mark or delay network packets. A set of classifier entries with corresponding conditioning functions when arranged in order of priority represents a QoS policy. A QoS policy may contain one or more classifier entries. These are defined in ietf-qos-policy module. Choudhary, et al. Expires 7 September 2022 [Page 4] Internet-Draft YANG Models for QoS March 2022 Actions are configured in line with respect to the policy module. These include marking, dropping or shaping. Actions are defined in the ietf-qos-action module. A meter qualifies if the traffic arrival rate is based on agreed upon rate and variability. A meter is modeled based on commonly used alogrithms in industry, Single Rate Tri Color Marking (srTCM) [RFC2697] meter, Two Rate Tri Color Marking (trTCM) [RFC2698] meter, and Single Rate Two Color Marking meter. Different vendors can extend it with other types of meters as well. 3. DiffServ Model Design DiffServ architecture [RFC3289] and [RFC2475] describe the architecture as a simple model where traffic entering a network is classified and possibly conditioned at the boundary of the network and assigned a different Behavior Aggregate (BA). Each BA is identified by a specific value of DSCP, and is used to select a Per Hop Behavior (PHB). The packet classification policy identifies the subset of traffic which may receive a DiffServ by being conditioned or mapped. Packet classifiers select packets within a stream based on the content of some portion of the packet header. There are two types of classifiers, the BA classifier, and the Multi-Field (MF) classifier which selects packets based on a value which is combination of one or more header fields. In the ietf-diffserv module, this is realized by augmenting the QoS classification module. Traffic conditioning includes metering, shaping and/or marking. A meter is used to measure the traffic against a given traffic profile. The traffic profile specifies the temporal property of the traffic. A packet that arrives is first determined to be in or out of the profile, which will result in the action of marked, dropped or shaped. This is realized in vendor specific modules based on the parameters defined in action module. The metering parameters are augmented to the QoS policy module when metering is defined inline, and to the metering template when metering profile is referred in policy module. 4. Modules Tree Structure This document defines seven YANG modules - four QoS base modules, a scheduler policy module, a queuing policy module and one DiffServ module. Choudhary, et al. Expires 7 September 2022 [Page 5] Internet-Draft YANG Models for QoS March 2022 ietf-qos-classifier consists of classifier entries identified by a classifier entry name. Each entry MAY contain a list of filter entries. When no filter entry is present in a classifier entry, it matches all traffic. module: ietf-qos-classifier +--rw classifiers {classifier-template-feature}? +--rw classifier* [name] +--rw name string +--rw description? string +--rw filter-operation? identityref +--rw filter* [type logical-not] ... Figure 1: ietf-qos-classifier tree diagram An ietf-qos-policy module contains list of policy objects identified by a policy name and policy type which MUST be provided. With different values of policy types, each vendor MAY define their own construct of policy for different QoS functionalities. Each vendor MAY augment classifier entry in a policy definition with a set of actions. module: ietf-qos-policy +--rw policies +--rw policy* [name type] +--rw name string +--rw type identityref +--rw description? string +--rw classifier* [name] ... Figure 2: ietf-qos-policy tree diagram ietf-qos-action module contains grouping of set of QoS actions. These include metering, marking, dropping and shaping. Marking sets DiffServ codepoint value in the classified packet. Color-aware and Color-blind meters are augmented by vendor specific modules based on the parameters defined in action module. module: ietf-qos-action +--rw meters +--rw meter* [name] {meter-template-support}? +--rw name string +--rw (meter-type)? ... Choudhary, et al. Expires 7 September 2022 [Page 6] Internet-Draft YANG Models for QoS March 2022 Figure 3: ietf-qos-actions tree diagram ietf-qos-target module contains reference of qos-policy and augments ietf-interfaces [RFC8343] module. A single policy of a particular policy-type can be applied on an interface in each direction of traffic. Policy-type is of type identity and is populated in a vendor specific manner. This way it provides greater flexibility for each vendor to define different policy types each with its own capabilities and restrictions. Classifier, metering and queuing counters are associated with a target. module: ietf-qos-target augment /if:interfaces/if:interface: +--rw qos-target-policy* [direction type] +--rw direction identityref +--rw type identityref +--rw name string Figure 4: ietf-qos-target tree diagram Diffserv module augments QoS classifier module. Many of the YANG types defined in [RFC6991] are represented as leafs in the classifier module. Metering and marking actions are realized by augmenting the QoS policy-module. Any queuing, AQM and scheduling actions are part of vendor specific augmentation. Statistics are realized by augmenting the QoS target module. module: ietf-diffserv augment /classifier:classifiers/classifier:classifier /classifier:filter: +--rw (filter-param)? +--:(dscp) | +--rw dscp* [dscp-min dscp-max] | ... +--:(source-ipv4-prefix) | +--rw source-ipv4-prefix* [source-ipv4-prefix] | ... +--:(destination-ipv4-prefix) | +--rw destination-ipv4-prefix* [destination-ipv4-prefix] | ... +--:(source-ipv6-prefix) | +--rw source-ipv6-prefix* [source-ipv6-prefix] Choudhary, et al. Expires 7 September 2022 [Page 7] Internet-Draft YANG Models for QoS March 2022 | ... +--:(destination-ipv6-prefix) | +--rw destination-ipv6-prefix* [destination-ipv6-prefix] | ... +--:(source-port) | +--rw source-port* [source-port-min source-port-max] | ... +--:(destination-port) | +--rw destination-port* | [destination-port-min destination-port-max] | ... +--:(protocol) | +--rw protocol* [protocol-min protocol-max] | ... +--:(traffic-group) +--rw traffic-group ... augment /policy:policies/policy:policy/policy:classifier /policy:filter: +--rw (filter-params)? +--:(dscp) | +--rw dscp* [dscp-min dscp-max] | ... +--:(source-ipv4-prefix) | +--rw source-ipv4-prefix* [source-ipv4-prefix] | ... +--:(destination-ipv4-prefix) | +--rw destination-ipv4-prefix* [destination-ipv4-prefix] | ... +--:(source-ipv6-prefix) | +--rw source-ipv6-prefix* [source-ipv6-prefix] | ... +--:(destination-ipv6-prefix) | +--rw destination-ipv6-prefix* [destination-ipv6-prefix] | ... +--:(source-port) | +--rw source-port* [source-port-min source-port-max] | ... +--:(destination-port) | +--rw destination-port* | [destination-port-min destination-port-max] | ... +--:(protocol) | +--rw protocol* [protocol-min protocol-max] | ... +--:(traffic-group) +--rw traffic-group ... Choudhary, et al. Expires 7 September 2022 [Page 8] Internet-Draft YANG Models for QoS March 2022 augment /policy:policies/policy:policy/policy:classifier /policy:action/policy:action-params: +--:(dscp-marking) | +--rw dscp | +--rw dscp? inet:dscp +--:(meter-inline) {action:meter-inline-feature}? | +--rw (meter-type)? | +--:(one-rate-two-color-meter-type) | | ... | +--:(one-rate-tri-color-meter-type) | | ... | +--:(two-rate-tri-color-meter-type) | ... +--:(meter-reference) {action:meter-reference-feature}? | +--rw meter | +--rw name string | +--rw type identityref +--:(traffic-group-marking) {action:traffic-group-feature}? | +--rw traffic-group | +--rw traffic-group? string +--:(child-policy) {action:child-policy-feature}? | +--rw child-policy {child-policy-feature}? | +--rw policy-name? string +--:(count) {action:count-feature}? | +--rw count {count-feature}? | +--rw count-action? empty +--:(named-count) {action:named-counter-feature}? | +--rw named-counter {named-counter-feature}? | +--rw count-name-action? string +--:(queue-inline) {diffserv-queue-inline-support}? | +--rw queue | +--rw priority | | ... | +--rw min-rate | | ... | +--rw max-rate | | ... | +--rw algorithmic-drop | ... +--:(scheduler-inline) {diffserv-scheduler-inline-support}? +--rw scheduler +--rw min-rate | ... +--rw max-rate ... Figure 5: ietf-diffserv tree diagram Choudhary, et al. Expires 7 September 2022 [Page 9] Internet-Draft YANG Models for QoS March 2022 module: ietf-queue-policy +--rw queue {queue-policy-support}? +--rw name? string +--rw queue +--rw priority | ... +--rw min-rate | ... +--rw max-rate | ... +--rw algorithmic-drop ... augment /policy:policies/policy:policy/policy:classifier /policy:filter: +--rw (filter-params)? {queue-policy-support}? +--:(traffic-group-name) +--rw traffic-group ... augment /policy:policies/policy:policy/policy:classifier /policy:action/policy:action-params: +--:(queue-template-name) | {queue-template-support,queue-policy-support}? | +--rw queue-reference | +--rw queue-name string +--:(queue-inline) {queue-inline-support,queue-policy-support}? +--rw queue +--rw priority | ... +--rw min-rate | ... +--rw max-rate | ... +--rw algorithmic-drop ... Figure 6: ietf-queue-policy tree diagram Choudhary, et al. Expires 7 September 2022 [Page 10] Internet-Draft YANG Models for QoS March 2022 module: ietf-scheduler-policy augment /policy:policies/policy:policy/policy:classifier /policy:filter: +--rw (filter-params)? +--:(filter-match-all) +--rw match-all-cfg ... augment /policy:policies/policy:policy/policy:classifier /policy:action/policy:action-params: +--:(scheduler) | +--rw scheduler | +--rw min-rate | | ... | +--rw max-rate | ... +--:(queue-policy-name) +--rw queue-policy-name +--rw queue-policy string Figure 7: ietf-scheduler-policy tree diagram 5. Modules Modules defined in this draft import definitions from "Common YANG Data Types" [RFC6991] and "A YANG Data Model for Interface Management" [RFC8343]. 5.1. ietf-qos-classifier file "ietf-qos-classifer@2022-03-06.yang" module ietf-qos-classifier { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-qos-classifier"; prefix classifier; organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani "; Choudhary, et al. Expires 7 September 2022 [Page 11] Internet-Draft YANG Models for QoS March 2022 description "This module contains a collection of YANG definitions for configuring qos specification implementations. Copyright (c) 2021 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 2022-03-06 { description "Initial version"; reference "RFC XXXX: YANG Models for Quality of Service (QoS)."; } feature policy-inline-classifier-config { description " This feature allows classifier configuration directly under policy."; } feature classifier-template-feature { description " This feature allows classifier as template configuration in a policy."; } feature match-any-filter-type-support { description " This feature allows classifier configuration directly under policy."; } identity filter-type { description "This is identity of base filter-type"; } identity match-filter-operation { description "filter match logical operation type"; } Choudhary, et al. Expires 7 September 2022 [Page 12] Internet-Draft YANG Models for QoS March 2022 identity match-all-filter { base match-filter-operation; description "Classifier entry filter logical AND operation"; } identity match-any-filter { if-feature "match-any-filter-type-support"; base match-filter-operation; description "Classifier entry filter logical OR operation"; } grouping filters { description "Filters types in a Classifier entry"; leaf type { type identityref { base filter-type; } description "This leaf defines type of the filter"; } leaf logical-not { type boolean; description " This is logical-not operator for a filter. When true, it indicates filter looks for absence of a pattern defined by the filter "; } } grouping generic-attr { description " Classifier generic attributes like name, description, operation type "; leaf name { type string; description "classifier entry name"; } leaf description { type string; description "classifier entry description statement"; } leaf filter-operation { Choudhary, et al. Expires 7 September 2022 [Page 13] Internet-Draft YANG Models for QoS March 2022 type identityref { base match-filter-operation; } default "match-all-filter"; description "Filters are applicable as match-any or match-all filters"; } } grouping inline-attr { description "attributes of inline classifier in a policy"; leaf inline { type boolean; default "false"; description "Indication of inline classifier entry"; } leaf filter-operation { type identityref { base match-filter-operation; } default "match-all-filter"; description "Filters are applicable as match-any or match-all filters"; } list filter{ if-feature policy-inline-classifier-config; must " ../classifier-entry-inline = 'true' " { description "For inline filter configuration, inline attribute" + "must be true"; } key "type logical-not"; uses filters; description "Filters configured inline in a policy"; } } container classifiers { if-feature classifier-template-feature; description "list of classifier entry"; list classifier{ key "name"; description "each classifier entry contains a list of filters"; uses generic-attr; list filter { Choudhary, et al. Expires 7 September 2022 [Page 14] Internet-Draft YANG Models for QoS March 2022 key "type logical-not"; uses filters; description "Filter entry configuration"; } } } } Figure 8: ietf-qos-classifier module 5.2. ietf-qos-policy file "ietf-qos-policy@2022-03-06.yang" module ietf-qos-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-qos-policy"; prefix policy; import ietf-qos-classifier { prefix classifier; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani "; description "This module contains a collection of YANG definitions for configuring qos specification implementations. Copyright (c) 2021 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 Choudhary, et al. Expires 7 September 2022 [Page 15] Internet-Draft YANG Models for QoS March 2022 (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 2022-03-06 { description "Initial version"; reference "RFC XXXX: YANG Models for Quality of Service (QoS)."; } identity policy-type { description "This base identity type defines policy-types"; } grouping generic-attr { description "Policy Attributes"; leaf name { type string; description "policy name"; } leaf type { type identityref { base policy-type; } description "policy type"; } leaf description { type string; description "policy description"; } } identity action-type { description "This base identity type defines action-types"; } grouping classifier-action-entry { description "List of Configuration of classifier & associated actions"; list action { key "type"; ordered-by user; description Choudhary, et al. Expires 7 September 2022 [Page 16] Internet-Draft YANG Models for QoS March 2022 "Configuration of classifier & associated actions"; leaf type { type identityref { base action-type; } description "This defines action type "; } choice action-params { description "Choice of action types"; } } } container policies{ description "list of policy templates"; list policy{ key "name type"; description "policy template"; uses generic-attr; list classifier{ key "name"; ordered-by user; description "Classifier entry configuration in a policy"; leaf name { type string; description "classifier entry name"; } uses classifier:inline-attr; uses classifier-action-entry; } } } } Figure 9: ietf-qos-policy module 5.3. ietf-qos-action Choudhary, et al. Expires 7 September 2022 [Page 17] Internet-Draft YANG Models for QoS March 2022 file "ietf-qos-action@2022-03-06.yang" module ietf-qos-action { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-qos-action"; prefix action; import ietf-inet-types { prefix inet; reference "RFC 6991: Common YANG Data Types"; } import ietf-qos-policy { prefix policy; reference "RFC XXXX: YANG Model for QoS"; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani "; description "This module contains a collection of YANG definitions for configuring qos specification implementations. Copyright (c) 2021 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 2022-03-06 { description "Initial version"; Choudhary, et al. Expires 7 September 2022 [Page 18] Internet-Draft YANG Models for QoS March 2022 reference "RFC XXXX: YANG Models for Quality of Service (QoS)."; } feature meter-template-support { description " This feature allows support of meter-template."; } feature meter-inline-feature { description " This feature allows support of meter-inline configuration."; } feature meter-reference-feature { description " This feature allows support of meter by reference configuration."; } feature queue-action-support { description " This feature allows support of queue action configuration in policy."; } feature scheduler-action-support { description " This feature allows support of scheduler configuration in policy."; } feature child-policy-feature { description " This feature allows configuration of hierarchical policy."; } feature count-feature { description "This feature allows action configuration to enable counter in a classifier"; } feature named-counter-feature { description "This feature allows action configuration to enable named counter in a classifier"; } feature traffic-group-feature { description "traffic-group action support"; } feature burst-time-unit-support { description "This feature allows burst unit to be configured as Choudhary, et al. Expires 7 September 2022 [Page 19] Internet-Draft YANG Models for QoS March 2022 time duration."; } identity rate-unit-type { description "base rate-unit type"; } identity bits-per-second { base rate-unit-type; description "bits per second identity"; } identity kilo-bits-per-second { base rate-unit-type; description "kilo bits per second identity"; } identity mega-bits-per-second { base rate-unit-type; description "mega bits per second identity"; } identity giga-bits-per-second { base rate-unit-type; description "mega bits per second identity"; } identity percent { base rate-unit-type; description "percentage"; } identity burst-unit-type { description "base burst-unit type"; } identity bytes { base burst-unit-type; description "bytes"; } identity kilo-bytes { base burst-unit-type; description "kilo bytes"; } identity mega-bytes { base burst-unit-type; Choudhary, et al. Expires 7 September 2022 [Page 20] Internet-Draft YANG Models for QoS March 2022 description "mega bytes"; } identity millisecond { if-feature burst-time-unit-support; base burst-unit-type; description "milli seconds"; } identity microsecond { if-feature burst-time-unit-support; base burst-unit-type; description "micro seconds"; } identity red-threshold-unit { description "base red-unit type"; } identity red-threshold-bytes { base red-threshold-unit; description "bytes"; } identity red-threshold-kb { base red-threshold-unit; description "kilo bytes"; } identity red-threshold-mb { base red-threshold-unit; description "mega bytes"; } identity red-threshold-ms { base red-threshold-unit; description "milli seconds"; } identity red-threshold-us { base red-threshold-unit; description "micro seconds"; } identity red-threshold-pc { base red-threshold-unit; description "per-centage"; Choudhary, et al. Expires 7 September 2022 [Page 21] Internet-Draft YANG Models for QoS March 2022 } identity red-theshold-pt { base red-threshold-unit; description "per-thousand"; } identity red-threshold-pm { base red-threshold-unit; description "per-million"; } identity wred-color-type { description "base wred color type"; } identity wred-color-dscp { base wred-color-type; description "dscp wred color type"; } identity probability-unit { description "base probability unit type"; } identity probability-pc { base probability-unit; description "probability in percentage"; } identity probability-pt { base probability-unit; description "probability in per thousand"; } identity probability-pm { base probability-unit; description "probability in per million"; } identity probability-denominator { base probability-unit; description "probability value is denominator value while numerator is always 1"; } identity dscp-marking { base policy:action-type; description Choudhary, et al. Expires 7 September 2022 [Page 22] Internet-Draft YANG Models for QoS March 2022 "dscp marking action type"; } identity meter-inline { if-feature meter-inline-feature; base policy:action-type; description "meter-inline action type"; } identity meter-reference { if-feature meter-reference-feature; base policy:action-type; description "meter reference action type"; } identity queue { if-feature queue-action-support; base policy:action-type; description "queue action type"; } identity scheduler { if-feature scheduler-action-support; base policy:action-type; description "scheduler action type"; } identity discard { base policy:action-type; description "discard action type"; } identity child-policy { if-feature child-policy-feature; base policy:action-type; description "child-policy action type"; } identity count { if-feature count-feature; base policy:action-type; description "count action type"; } identity named-counter { if-feature named-counter-feature; base policy:action-type; description "name counter action type"; Choudhary, et al. Expires 7 September 2022 [Page 23] Internet-Draft YANG Models for QoS March 2022 } identity meter-type { description "This base identity type defines meter types"; } identity one-rate-two-color-meter-type { base meter-type; description "one rate two color meter type"; } identity one-rate-tri-color-meter-type { base meter-type; description "one rate three color meter type"; } identity two-rate-tri-color-meter-type { base meter-type; description "two rate three color meter action type"; } identity drop-type { description "drop algorithm"; } identity tail-drop { base drop-type; description "tail drop algorithm"; } identity red { base drop-type; description "Random Early Detect drop algorithm"; } identity wred { base drop-type; description "Weighted Random Early Detect drop algorithm"; } identity conform-2color-meter-action-type { description "action type in a meter"; } identity exceed-2color-meter-action-type { description Choudhary, et al. Expires 7 September 2022 [Page 24] Internet-Draft YANG Models for QoS March 2022 "action type in a meter"; } identity conform-3color-meter-action-type { description "action type in a meter"; } identity exceed-3color-meter-action-type { description "action type in a meter"; } identity violate-3color-meter-action-type { description "action type in a meter"; } grouping rate-value-unit { leaf rate-value { type uint64; description "rate value"; } leaf rate-unit { type identityref { base rate-unit-type; } description "rate unit"; } description "rate value and unit grouping"; } grouping burst { description "burst value and unit configuration"; leaf burst-value { type uint64; description "burst value"; } leaf burst-unit { type identityref { base burst-unit-type; } description "burst unit"; } } Choudhary, et al. Expires 7 September 2022 [Page 25] Internet-Draft YANG Models for QoS March 2022 grouping threshold { description "Threshold Parameters"; container threshold { description "threshold"; choice threshold-type { case size { leaf threshold-size { type uint64; units "bytes"; description "Threshold size"; } } case interval { leaf threshold-interval { type uint64; units "microsecond"; description "Threshold interval"; } } description "Choice of threshold type"; } } } grouping drop { container drop { leaf drop-action { type empty; description "always drop algorithm"; } description "the drop action"; } description "always drop grouping"; } grouping queuelimit { container qlimit-thresh { uses threshold; description "the queue limit"; Choudhary, et al. Expires 7 September 2022 [Page 26] Internet-Draft YANG Models for QoS March 2022 } description "the queue limit beyond which queue will not hold any packet"; } grouping conform-2color-meter-action-params { description "meter action parameters"; list conform-2color-meter-action-params { key "conform-2color-meter-action-type"; ordered-by user; description "Configuration of basic-meter & associated actions"; leaf conform-2color-meter-action-type { type identityref { base conform-2color-meter-action-type; } description "meter action type"; } choice conform-2color-meter-action-val { description " meter action based on choice of meter action type"; } } } grouping exceed-2color-meter-action-params { description "meter action parameters"; list exceed-2color-meter-action-params { key "exceed-2color-meter-action-type"; ordered-by user; description "Configuration of basic-meter & associated actions"; leaf exceed-2color-meter-action-type { type identityref { base exceed-2color-meter-action-type; } description "meter action type"; } choice exceed-2color-meter-action-val { description " meter action based on choice of meter action type"; } } } Choudhary, et al. Expires 7 September 2022 [Page 27] Internet-Draft YANG Models for QoS March 2022 grouping conform-3color-meter-action-params { description "meter action parameters"; list conform-3color-meter-action-params { key "conform-3color-meter-action-type"; ordered-by user; description "Configuration of basic-meter & associated actions"; leaf conform-3color-meter-action-type { type identityref { base conform-3color-meter-action-type; } description "meter action type"; } choice conform-3color-meter-action-val { description " meter action based on choice of meter action type"; } } } grouping exceed-3color-meter-action-params { description "meter action parameters"; list exceed-3color-meter-action-params { key "exceed-3color-meter-action-type"; ordered-by user; description "Configuration of basic-meter & associated actions"; leaf exceed-3color-meter-action-type { type identityref { base exceed-3color-meter-action-type; } description "meter action type"; } choice exceed-3color-meter-action-val { description " meter action based on choice of meter action type"; } } } grouping violate-3color-meter-action-params { description "meter action parameters"; list violate-3color-meter-action-params { Choudhary, et al. Expires 7 September 2022 [Page 28] Internet-Draft YANG Models for QoS March 2022 key "violate-3color-meter-action-type"; ordered-by user; description "Configuration of basic-meter & associated actions"; leaf violate-3color-meter-action-type { type identityref { base violate-3color-meter-action-type; } description "meter action type"; } choice violate-3color-meter-action-val { description " meter action based on choice of meter action type"; } } } grouping one-rate-two-color-meter { container one-rate-two-color-meter { description "single rate two color marker meter"; leaf committed-rate-value { type uint64; description "committed rate value"; } leaf committed-rate-unit { type identityref { base rate-unit-type; } description "committed rate unit"; } leaf committed-burst-value { type uint64; description "burst value"; } leaf committed-burst-unit { type identityref { base burst-unit-type; } description "committed burst unit"; } container conform-action { uses conform-2color-meter-action-params; Choudhary, et al. Expires 7 September 2022 [Page 29] Internet-Draft YANG Models for QoS March 2022 description "conform action"; } container exceed-action { uses exceed-2color-meter-action-params; description "exceed action"; } } description "single rate two color marker meter attributes"; } grouping one-rate-tri-color-meter { container one-rate-tri-color-meter { description "single rate three color meter"; leaf committed-rate-value { type uint64; description "meter rate"; } leaf committed-rate-unit { type identityref { base rate-unit-type; } description "committed rate unit"; } leaf committed-burst-value { type uint64; description "committed burst size"; } leaf committed-burst-unit { type identityref { base burst-unit-type; } description "committed burst unit"; } leaf excess-burst-value { type uint64; description "excess burst size"; } leaf excess-burst-unit { type identityref { Choudhary, et al. Expires 7 September 2022 [Page 30] Internet-Draft YANG Models for QoS March 2022 base burst-unit-type; } description "excess burst unit"; } container conform-action { uses conform-3color-meter-action-params; description "conform, or green action"; } container exceed-action { uses exceed-3color-meter-action-params; description "exceed, or yellow action"; } container violate-action { uses violate-3color-meter-action-params; description "violate, or red action"; } } description "one-rate-tri-color-meter attributes"; } grouping two-rate-tri-color-meter { container two-rate-tri-color-meter { description "two rate three color meter"; leaf committed-rate-value { type uint64; units "bits-per-second"; description "committed rate"; } leaf committed-rate-unit { type identityref { base rate-unit-type; } description "committed rate unit"; } leaf committed-burst-value { type uint64; description "commited burst size"; } leaf committed-burst-unit { Choudhary, et al. Expires 7 September 2022 [Page 31] Internet-Draft YANG Models for QoS March 2022 type identityref { base burst-unit-type; } description "committed burst unit"; } leaf peak-rate-value { type uint64; description "peak rate"; } leaf peak-rate-unit { type identityref { base rate-unit-type; } description "committed rate unit"; } leaf peak-burst-value { type uint64; description "commited burst size"; } leaf peak-burst-unit { type identityref { base burst-unit-type; } description "peak burst unit"; } container conform-action { uses conform-3color-meter-action-params; description "conform, or green action"; } container exceed-action { uses exceed-3color-meter-action-params; description "exceed, or yellow action"; } container violate-action { uses violate-3color-meter-action-params; description "exceed, or red action"; } } description "two-rate-tri-color-meter attributes"; Choudhary, et al. Expires 7 September 2022 [Page 32] Internet-Draft YANG Models for QoS March 2022 } grouping meter { choice meter-type { case one-rate-two-color-meter-type { uses one-rate-two-color-meter; description "basic meter"; } case one-rate-tri-color-meter-type { uses one-rate-tri-color-meter; description "one rate tri-color meter"; } case two-rate-tri-color-meter-type { uses two-rate-tri-color-meter; description "two rate tri-color meter"; } description " meter action based on choice of meter action type"; } description "meter attributes"; } container meters { description "list of meter templates"; list meter { if-feature meter-template-support; key "name"; description "meter entry template"; leaf name { type string; description "meter identifier"; } uses meter; } } grouping meter-reference { container meter { leaf name { type string ; mandatory true; Choudhary, et al. Expires 7 September 2022 [Page 33] Internet-Draft YANG Models for QoS March 2022 description "This leaf defines name of the meter referenced"; } leaf type { type identityref { base meter-type; } mandatory true; description "This leaf defines type of the meter"; } description "meter reference name"; } description "meter reference"; } grouping count { container count { if-feature count-feature; leaf count-action { type empty; description "count action"; } description "the count action"; } description "the count action grouping"; } grouping named-counter { container named-counter { if-feature named-counter-feature; leaf count-name-action { type string; description "count action"; } description "the count action"; } description "the count action grouping"; } Choudhary, et al. Expires 7 September 2022 [Page 34] Internet-Draft YANG Models for QoS March 2022 grouping discard { container discard { leaf discard { type empty; description "discard action"; } description "discard action"; } description "discard grouping"; } grouping priority { container priority { leaf priority-level { type uint8; description "priority level"; } description "priority attributes"; } description "priority attributes grouping"; } grouping min-rate { container min-rate { uses rate-value-unit; description "min guaranteed bandwidth"; } description "minimum rate grouping"; } grouping dscp-marking { container dscp { leaf dscp { type inet:dscp; description "dscp marking"; } description "dscp marking container"; } description "dscp marking grouping"; Choudhary, et al. Expires 7 September 2022 [Page 35] Internet-Draft YANG Models for QoS March 2022 } grouping traffic-group-marking { container traffic-group { leaf traffic-group { type string; description "traffic group marking"; } description "traffic group marking container"; } description "traffic group marking grouping"; } grouping child-policy { container child-policy { if-feature child-policy-feature; leaf policy-name { type string; description "Hierarchical Policy"; } description "Hierarchical Policy configuration container"; } description "Grouping of Hierarchical Policy configuration"; } grouping max-rate { container max-rate { uses rate-value-unit; uses burst; description "maximum rate attributes container"; } description "maximum rate attributes"; } grouping red-config-parameters { leaf min-threshold-val { type uint64; description "minimum value of red threshold"; } leaf min-threshold-unit { type identityref { base red-threshold-unit; } Choudhary, et al. Expires 7 September 2022 [Page 36] Internet-Draft YANG Models for QoS March 2022 description "unit of minimum red threshold"; } leaf max-threshold-val { type uint64; description "maximum value of red threshold"; } leaf max-threshold-unit { type identityref { base red-threshold-unit; } description "unit of maximum red threshold"; } leaf weight { type uint8; description "the decay factor for the average queue size calculation. the numbers are 2's exponent"; } leaf max-probability-val { type uint64; description "value of maximum probability value. this value need be interpreted along with max-probability-unit"; } leaf max-probability-unit { type identityref { base probability-unit; } description "probability unit type as defined by probability-unit"; } description "Random Early Detect Configuration Parameters"; } grouping queue { container queue { uses priority; uses min-rate; uses max-rate; container algorithmic-drop { choice drop-algorithm { case tail-drop { container tail-drop { leaf tail-drop { Choudhary, et al. Expires 7 September 2022 [Page 37] Internet-Draft YANG Models for QoS March 2022 type empty; description "tail drop algorithm"; } description "Tail Drop configuration container"; } description "Tail Drop choice"; } case red { container red { uses red-config-parameters; leaf ecn-enabled { type boolean; default "false"; description "ecn is enabled on the queue"; } description "Random Early Detect configuration"; } } case wred { container wred { list wred { key "profile"; leaf profile { type uint8; description "profile id of each wred profile"; } leaf color-type { type identityref { base wred-color-type; } description "wred color-type of each profile"; } list color-val { key "min max"; leaf min { type uint8; description "minimum value of color types"; } leaf max { type uint8; Choudhary, et al. Expires 7 September 2022 [Page 38] Internet-Draft YANG Models for QoS March 2022 description "maximum value of color types"; } description "list of color markings which constitute a traffic profile"; } uses red-config-parameters; description "list of RED profiles each with its own threshold values"; } leaf ecn-enabled { type boolean; default "false"; description "ecn is enabled on the queue"; } description "Weighted Random Early Detect configuration"; } } description "Choice of Drop Algorithm"; } description "Algorithmic Drop configuration container"; } description "Queue configuration container"; } description "Queue grouping"; } grouping scheduler { container scheduler { uses min-rate; uses max-rate; description "Schedular configuration container"; } description "Schedular configuration grouping"; } } Figure 10: ietf-qos-actions module Choudhary, et al. Expires 7 September 2022 [Page 39] Internet-Draft YANG Models for QoS March 2022 5.4. ietf-qos-target file "ietf-qos-target@2022-03-06.yang" module ietf-qos-target { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-qos-target"; prefix target; import ietf-interfaces { prefix if; } import ietf-qos-policy { prefix policy; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani Figure 11: ietf-qos-target module 5.5. ietf-diffserv file "ietf-diffserv@2022-03-06.yang" module ietf-diffserv { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-diffserv"; prefix diffserv; import ietf-qos-classifier { prefix classifier; } import ietf-qos-policy { prefix policy; } import ietf-qos-action { prefix action; } import ietf-inet-types { prefix inet; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani = ../dscp-min" { error-message "The dscp-max must be greater than or equal to dscp-min"; } description "maximum value of dscp min-max range"; } } description "Filter grouping containing list of dscp ranges"; } grouping source-ipv4-prefix { list source-ipv4-prefix { key "source-ipv4-prefix"; description "list of source ipv4 prefix"; leaf source-ipv4-prefix { type inet:ipv4-prefix; description "source ipv4 prefix"; } } description "Filter grouping containing list of source ipv4 prefixes"; } grouping destination-ipv4-prefix { list destination-ipv4-prefix { key "destination-ipv4-prefix"; description "list of destination ipv4 prefix"; Choudhary, et al. Expires 7 September 2022 [Page 45] Internet-Draft YANG Models for QoS March 2022 leaf destination-ipv4-prefix { type inet:ipv4-prefix; description "destination ipv4 prefix"; } } description "Filter grouping containing list of destination ipv4 prefix"; } grouping source-ipv6-prefix { list source-ipv6-prefix { key "source-ipv6-prefix"; description "list of source ipv6 prefix"; leaf source-ipv6-prefix { type inet:ipv6-prefix; description "source ipv6 prefix"; } } description "Filter grouping containing list of source ipv6 prefixes"; } grouping destination-ipv6-prefix { list destination-ipv6-prefix { key "destination-ipv6-prefix"; description "list of destination ipv4 or ipv6 prefix"; leaf destination-ipv6-prefix { type inet:ipv6-prefix; description "destination ipv6 prefix"; } } description "Filter grouping containing list of destination ipv6 prefix"; } grouping source-port { list source-port { key "source-port-min source-port-max"; description "list of ranges of source port"; leaf source-port-min { type inet:port-number; description "minimum value of source port range"; } leaf source-port-max { Choudhary, et al. Expires 7 September 2022 [Page 46] Internet-Draft YANG Models for QoS March 2022 type inet:port-number; must ". >= ../source-port-min" { error-message "The source-port-max must be greater than or equal to source-port-min"; } description "maximum value of source port range"; } } description "Filter grouping containing list of source port ranges"; } grouping destination-port { list destination-port { key "destination-port-min destination-port-max"; description "list of ranges of destination port"; leaf destination-port-min { type inet:port-number; description "minimum value of destination port range"; } leaf destination-port-max { type inet:port-number; must ". >= ../destination-port-min" { error-message "The destination-port-max must be greater than or equal to destination-port-min"; } description "maximum value of destination port range"; } } description "Filter grouping containing list of destination port ranges"; } grouping protocol { list protocol { key "protocol-min protocol-max"; description "list of ranges of protocol values. Protocol refers to the value in the protocol field of the ipv4 header and value in the 'next-header' field of ipv6 header. In ipv6 header, 'next-header' field indicates first extension header or the protocol in the 'upper-layer' header."; reference "RFC 791: Internet Protocol Choudhary, et al. Expires 7 September 2022 [Page 47] Internet-Draft YANG Models for QoS March 2022 RFC 8200: Internet Protocol, Version 6 (IPv6) Specification"; leaf protocol-min { type uint8 { range "0..255"; } description "minimum value of protocol range"; } leaf protocol-max { type uint8 { range "0..255"; } must ". >= ../protocol-min" { error-message "The protocol-max must be greater than or equal to protocol-min"; } description "maximum value of protocol range"; } } description "Filter grouping containing list of Protocol ranges"; } grouping traffic-group { container traffic-group { leaf traffic-group-name { type string ; description "This leaf defines name of the traffic group referenced"; } description "traffic group container"; } description "traffic group grouping"; } augment "/classifier:classifiers/classifier:classifier" + "/classifier:filter" { choice filter-param { description "Choice of filter types"; case dscp { uses dscp; description "Filter containing list of dscp ranges"; } Choudhary, et al. Expires 7 September 2022 [Page 48] Internet-Draft YANG Models for QoS March 2022 case source-ipv4-prefix { uses source-ipv4-prefix; description "Filter containing list of source ipv4 prefixes"; } case destination-ipv4-prefix { uses destination-ipv4-prefix; description "Filter containing list of destination ipv4 prefix"; } case source-ipv6-prefix { uses source-ipv6-prefix; description "Filter containing list of source ipv6 prefixes"; } case destination-ipv6-prefix { uses destination-ipv6-prefix; description "Filter containing list of destination ipv6 prefix"; } case source-port { uses source-port; description "Filter containing list of source-port ranges"; } case destination-port { uses destination-port; description "Filter containing list of destination-port ranges"; } case protocol { uses protocol; description "Filter Type Protocol"; } case traffic-group { uses traffic-group; description "Filter Type traffic-group"; } } description "augments diffserv filters to qos classifier"; } augment "/policy:policies/policy:policy/policy:classifier" + "/policy:filter" { when "../../policy:type = 'diffserv:ipv4-diffserv-policy-type' or ../../policy:type = 'diffserv:ipv6-diffserv-policy-type' or ../../policy:type = 'diffserv:diffserv-policy-type'" { Choudhary, et al. Expires 7 September 2022 [Page 49] Internet-Draft YANG Models for QoS March 2022 description "If policy type is v4, v6 or default diffserv, this filter can be used."; } choice filter-params { description "Choice of action types"; case dscp { uses dscp; description "Filter containing list of dscp ranges"; } case source-ipv4-prefix { when "/policy:policies/policy:policy/policy:type != " + "'diffserv:ipv6-diffserv-policy-type'" { description "If policy type is v6, this filter cannot be used."; } uses source-ipv4-prefix; description "Filter containing list of source ipv4 prefixes"; } case destination-ipv4-prefix { when "/policy:policies/policy:policy/policy:type != " + "'diffserv:ipv6-diffserv-policy-type'" { description "If policy type is v6, this filter cannot be used."; } uses destination-ipv4-prefix; description "Filter containing list of destination ipv4 prefix"; } case source-ipv6-prefix { when "/policy:policies/policy:policy/policy:type != "+ "'diffserv:ipv4-diffserv-policy-type'" { description "If policy type is v4, this filter cannot be used."; } uses source-ipv6-prefix; description "Filter containing list of source ipv6 prefixes"; } case destination-ipv6-prefix { when "/policy:policies/policy:policy/policy:type != " + "'diffserv:ipv4-diffserv-policy-type'" { description "If policy type is v4, this filter cannot be used."; } Choudhary, et al. Expires 7 September 2022 [Page 50] Internet-Draft YANG Models for QoS March 2022 uses destination-ipv6-prefix; description "Filter containing list of destination ipv6 prefix"; } case source-port { uses source-port; description "Filter containing list of source-port ranges"; } case destination-port { uses destination-port; description "Filter containing list of destination-port ranges"; } case protocol { uses protocol; description "Filter Type Protocol"; } case traffic-group { uses traffic-group; description "Filter Type traffic-group"; } } description "Augments Diffserv Classifier with common filter types"; } augment "/policy:policies/policy:policy/policy:classifier" + "/policy:action/policy:action-params" { when "../../policy:type = 'diffserv:ipv4-diffserv-policy-type' or ../../policy:type = 'diffserv:ipv6-diffserv-policy-type' or ../../policy:type = 'diffserv:diffserv-policy-type' " { description "If policy type is v4, v6 or default diffserv, these actions can be used."; } description "Augments Diffserv Policy with action configuration"; case dscp-marking { uses action:dscp-marking; } case meter-inline { if-feature action:meter-inline-feature; uses action:meter; } case meter-reference { Choudhary, et al. Expires 7 September 2022 [Page 51] Internet-Draft YANG Models for QoS March 2022 if-feature action:meter-reference-feature; uses action:meter-reference; } case traffic-group-marking { if-feature action:traffic-group-feature; uses action:traffic-group-marking; } case child-policy { if-feature action:child-policy-feature; uses action:child-policy; } case count { if-feature action:count-feature; uses action:count; } case named-count { if-feature action:named-counter-feature; uses action:named-counter; } case queue-inline { if-feature diffserv-queue-inline-support; uses action:queue; } case scheduler-inline { if-feature diffserv-scheduler-inline-support; uses action:scheduler; } } } Figure 12: ietf-diffserv module 5.6. ietf-queue-policy file "ietf-queue-policy@2022-03-06.yang" module ietf-queue-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-queue-policy"; prefix queue-policy; import ietf-qos-policy { prefix policy; } import ietf-qos-action { prefix action; } Choudhary, et al. Expires 7 September 2022 [Page 52] Internet-Draft YANG Models for QoS March 2022 import ietf-diffserv { prefix diffserv; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani Figure 13: ietf-queue-policy module 5.7. ietf-scheduler-policy Choudhary, et al. Expires 7 September 2022 [Page 55] Internet-Draft YANG Models for QoS March 2022 file "ietf-scheduler-policy@2022-03-06.yang" module ietf-scheduler-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-scheduler-policy"; prefix scheduler-policy; import ietf-qos-classifier { prefix classifier; } import ietf-qos-policy { prefix policy; } import ietf-qos-action { prefix action; } organization "IETF Routing Area Working Group"; contact "WG Web: WG List: Editor: Aseem Choudhary Editor: Mahesh Jethanandani Figure 14: ietf-scheduler-policy module 6. IANA Considerations TBD 7. Security Considerations 8. Acknowledgement The authors wish to thank Ruediger Geib, Fred Baker, Greg Misky, Tom Petch, Acee Lindem, many others for their helpful comments. MITRE has approved this document for Public Release, Distribution Unlimited, with Public Release Case Number 19-3027. 9. Contributors The following people have substantially contributed to the editing of this document: Norm Strahle Email: nstrahle@juniper.net . 10. References 10.1. 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, . [RFC2697] Heinanen, J. and R. Guerin, "A Single Rate Three Color Marker", RFC 2697, DOI 10.17487/RFC2697, September 1999, . [RFC2698] Heinanen, J. and R. Guerin, "A Two Rate Three Color Marker", RFC 2698, DOI 10.17487/RFC2698, September 1999, . [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, . Choudhary, et al. Expires 7 September 2022 [Page 59] Internet-Draft YANG Models for QoS March 2022 [RFC3289] Baker, F., Chan, K., and A. Smith, "Management Information Base for the Differentiated Services Architecture", RFC 3289, DOI 10.17487/RFC3289, May 2002, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . 10.2. Informative References [RFC2474] Nichols, K., Blake, S., Baker, F., and D. Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC 2474, DOI 10.17487/RFC2474, December 1998, . [RFC2475] Blake, S., Black, D., Carlson, M., Davies, E., Wang, Z., and W. Weiss, "An Architecture for Differentiated Services", RFC 2475, DOI 10.17487/RFC2475, December 1998, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . Choudhary, et al. Expires 7 September 2022 [Page 60] Internet-Draft YANG Models for QoS March 2022 Appendix A. Company A, Company B and Company C examples Company A, Company B and Company C Diffserv modules augments all the filter types of the QoS classifier module as well as the QoS policy module that allow it to define marking, metering, min-rate, max-rate actions. Queuing and metering counters are realized by augmenting of the QoS target module. A.1. Example of Company A Diffserv Model The following Company A vendor example augments the qos and diffserv model, demonstrating some of the following functionality: - use of template based classifier definitions - use of single policy type modelling queue, scheduler policy, and a filter policy. All of these policies either augment the qos policy or the diffserv modules - use of inline actions in a policy - flexibility in marking dscp or metadata at ingress and/or egress. module example-compa-diffserv { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:example-compa-diffserv"; prefix example; import ietf-qos-classifier { prefix classifier; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-policy { prefix policy; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-action { prefix action; reference "RFC XXXX: YANG Model for QoS"; } import ietf-diffserv { prefix diffserv; reference "RFC XXXX: YANG Model for QoS"; } organization "Company A"; contact "Editor: XYZ Choudhary, et al. Expires 7 September 2022 [Page 61] Internet-Draft YANG Models for QoS March 2022 "; description "This module contains a collection of YANG definitions of companyA diffserv specification extension."; Copyright (c) 2021 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 2021-07-12 { description "Initial revision for diffserv actions on network packets"; reference "RFC 6020: YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)"; } identity default-policy-type { base policy:policy-type; description "This defines default policy-type"; } identity qos-group { base classifier:filter-type; description "qos-group filter-type"; } grouping qos-group-cfg { list qos-group-cfg { key "qos-group-min qos-group-max"; description "list of dscp ranges"; leaf qos-group-min { type uint8; description "Minimum value of qos-group range"; } leaf qos-group-max { type uint8; Choudhary, et al. Expires 7 September 2022 [Page 62] Internet-Draft YANG Models for QoS March 2022 must ". >= ../qos-group-min" { error-message "The qos-group-max must be greater than or equal to qos-group-min"; } description "maximum value of qos-group range"; } } description "Filter containing list of qos-group ranges"; } grouping wred-threshold { container wred-min-thresh { uses action:threshold; description "Minimum threshold"; } container wred-max-thresh { uses action:threshold; description "Maximum threshold"; } leaf mark-probability { type uint32 { range "1..1000"; } description "Mark probability"; } description "WRED threshold attributes"; } grouping randomdetect { leaf exp-weighting-const { type uint32; description "Exponential weighting constant factor for wred profile"; } uses wred-threshold; description "Random detect attributes"; } augment "/classifier:classifiers/" + "classifier:classifier-entry/" + Choudhary, et al. Expires 7 September 2022 [Page 63] Internet-Draft YANG Models for QoS March 2022 "classifier:filter-entry/diffserv:filter-param" { case qos-group { uses qos-group-cfg; description "Filter containing list of qos-group ranges. Qos-group represent packet metadata information in a device. "; } description "augmentation of classifier filters"; } augment "/policy:policies/policy:policy-entry/" + "policy:classifier-entry/" + "policy:classifier-action-entry-cfg/" + "policy:action-cfg-params" { case random-detect { uses randomdetect; } description "Augment the actions to policy entry"; } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-two-color-meter-type" + "/diffserv:one-rate-two-color-meter" + "/diffserv:conform-action" + "/diffserv:conform-2color-meter-action-params" + "/diffserv:conform-2color-meter-action-val" { description "augment the one-rate-two-color meter conform with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } Choudhary, et al. Expires 7 September 2022 [Page 64] Internet-Draft YANG Models for QoS March 2022 } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-two-color-meter-type" + "/diffserv:one-rate-two-color-meter" + "/diffserv:exceed-action" + "/diffserv:exceed-2color-meter-action-params" + "/diffserv:exceed-2color-meter-action-val" { description "augment the one-rate-two-color meter exceed with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-tri-color-meter-type" + "/diffserv:one-rate-tri-color-meter" + "/diffserv:conform-action" + "/diffserv:conform-3color-meter-action-params" + "/diffserv:conform-3color-meter-action-val" { description "augment the one-rate-tri-color meter conform with actions"; case meter-action-drop { description "meter drop"; uses action:drop; Choudhary, et al. Expires 7 September 2022 [Page 65] Internet-Draft YANG Models for QoS March 2022 } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-tri-color-meter-type" + "/diffserv:one-rate-tri-color-meter" + "/diffserv:exceed-action" + "/diffserv:exceed-3color-meter-action-params" + "/diffserv:exceed-3color-meter-action-val" { description "augment the one-rate-tri-color meter exceed with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-tri-color-meter-type" + "/diffserv:one-rate-tri-color-meter" + "/diffserv:violate-action" + "/diffserv:violate-3color-meter-action-params" + "/diffserv:violate-3color-meter-action-val" { description "augment the one-rate-tri-color meter conform Choudhary, et al. Expires 7 September 2022 [Page 66] Internet-Draft YANG Models for QoS March 2022 with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:two-rate-tri-color-meter-type" + "/diffserv:two-rate-tri-color-meter" + "/diffserv:conform-action" + "/diffserv:conform-3color-meter-action-params" + "/diffserv:conform-3color-meter-action-val" { description "augment the one-rate-tri-color meter conform with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:two-rate-tri-color-meter-type" + Choudhary, et al. Expires 7 September 2022 [Page 67] Internet-Draft YANG Models for QoS March 2022 "/diffserv:two-rate-tri-color-meter" + "/diffserv:exceed-action" + "/diffserv:exceed-3color-meter-action-params" + "/diffserv:exceed-3color-meter-action-val" { description "augment the two-rate-tri-color meter exceed with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:two-rate-tri-color-meter-type" + "/diffserv:two-rate-tri-color-meter" + "/diffserv:violate-action" + "/diffserv:violate-3color-meter-action-params" + "/diffserv:violate-3color-meter-action-val" { description "augment the two-rate-tri-color meter violate with actions"; case meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-dscp { description "meter action dscp marking"; uses action:dscp-marking; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + Choudhary, et al. Expires 7 September 2022 [Page 68] Internet-Draft YANG Models for QoS March 2022 "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-two-color-meter-type" + "/diffserv:one-rate-two-color-meter" { description "augment the one-rate-two-color meter with" + "color classifiers"; container conform-color { uses classifier:classifier-entry-generic-attr; description "conform color classifier container"; } container exceed-color { uses classifier:classifier-entry-generic-attr; description "exceed color classifier container"; } } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:one-rate-tri-color-meter-type" + "/diffserv:one-rate-tri-color-meter" { description "augment the one-rate-tri-color meter with" + "color classifiers"; container conform-color { uses classifier:classifier-entry-generic-attr; description "conform color classifier container"; } container exceed-color { uses classifier:classifier-entry-generic-attr; description "exceed color classifier container"; } container violate-color { uses classifier:classifier-entry-generic-attr; description "violate color classifier container"; } } Choudhary, et al. Expires 7 September 2022 [Page 69] Internet-Draft YANG Models for QoS March 2022 augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" + "/policy:action-cfg-params" + "/diffserv:meter-inline" + "/diffserv:meter-type" + "/diffserv:two-rate-tri-color-meter-type" + "/diffserv:two-rate-tri-color-meter" { description "augment the two-rate-tri-color meter with" + "color classifiers"; container conform-color { uses classifier:classifier-entry-generic-attr; description "conform color classifier container"; } container exceed-color { uses classifier:classifier-entry-generic-attr; description "exceed color classifier container"; } container violate-color { uses classifier:classifier-entry-generic-attr; description "violate color classifier container"; } } } A.2. Example of Company B Diffserv Model The following vendor example augments the qos and diffserv model, demonstrating some of the following functionality: - use of inline classifier definitions (defined inline in the policy vs referencing an externally defined classifier) - use of mulitple policy types, e.g. a queue policy, a scheduler policy, and a filter policy. All of these policies either augment the qos policy or the diffserv modules - use of a queue module, which uses and extends the queue grouping from the ietf-qos-action module - use of meter templates (v.s. meter inline) - use of internal meta data for classification and marking Choudhary, et al. Expires 7 September 2022 [Page 70] Internet-Draft YANG Models for QoS March 2022 module example-compb-diffserv-filter-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:" + "example-compb-diffserv-filter-policy"; prefix compb-filter-policy; import ietf-qos-classifier { prefix classifier; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-policy { prefix policy; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-action { prefix action; reference "RFC XXXX: YANG Model for QoS"; } import ietf-diffserv { prefix diffserv; reference "RFC XXXX: YANG Model for QoS"; } organization "Company B"; contact "Editor: XYZ "; description "This module contains a collection of YANG definitions for configuring diffserv specification implementations. Copyright (c) 2021 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 2021-07-12 { description "Initial revision of Company B diffserv policy"; reference "RFC XXXX"; } Choudhary, et al. Expires 7 September 2022 [Page 71] Internet-Draft YANG Models for QoS March 2022 /************************************************* * Classification types *************************************************/ identity forwarding-class { base classifier:filter-type; description "Forwarding class filter type"; } identity internal-loss-priority { base classifier:filter-type; description "Internal loss priority filter type"; } grouping forwarding-class-cfg { list forwarding-class-cfg { key "forwarding-class"; description "list of forwarding-classes"; leaf forwarding-class { type string; description "Forwarding class name"; } } description "Filter containing list of forwarding classes"; } grouping loss-priority-cfg { list loss-priority-cfg { key "loss-priority"; description "list of loss-priorities"; leaf loss-priority { type enumeration { enum high { description "High Loss Priority"; } enum medium-high { description "Medium-high Loss Priority"; } enum medium-low { description "Medium-low Loss Priority"; } enum low { Choudhary, et al. Expires 7 September 2022 [Page 72] Internet-Draft YANG Models for QoS March 2022 description "Low Loss Priority"; } } description "Loss-priority"; } } description "Filter containing list of loss priorities"; } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:filter-entry" + "/diffserv:filter-params" { case forwarding-class { uses forwarding-class-cfg; description "Filter Type Internal-loss-priority"; } case internal-loss-priority { uses loss-priority-cfg; description "Filter Type Internal-loss-priority"; } description "Augments Diffserv Classifier with vendor" + " specific types"; } /************************************************* * Actions *************************************************/ identity mark-fwd-class { base policy:action-type; description "mark forwarding class action type"; } identity mark-loss-priority { base policy:action-type; description "mark loss-priority action type"; } grouping mark-fwd-class { Choudhary, et al. Expires 7 September 2022 [Page 73] Internet-Draft YANG Models for QoS March 2022 container mark-fwd-class-cfg { leaf forwarding-class { type string; description "Forwarding class name"; } description "mark-fwd-class container"; } description "mark-fwd-class grouping"; } grouping mark-loss-priority { container mark-loss-priority-cfg { leaf loss-priority { type enumeration { enum high { description "High Loss Priority"; } enum medium-high { description "Medium-high Loss Priority"; } enum medium-low { description "Medium-low Loss Priority"; } enum low { description "Low Loss Priority"; } } description "Loss-priority"; } description "mark-loss-priority container"; } description "mark-loss-priority grouping"; } identity exceed-2color-meter-action-drop { base action:exceed-2color-meter-action-type; description "drop action type in a meter"; } identity meter-action-mark-fwd-class { base action:exceed-2color-meter-action-type; Choudhary, et al. Expires 7 September 2022 [Page 74] Internet-Draft YANG Models for QoS March 2022 description "mark forwarding class action type"; } identity meter-action-mark-loss-priority { base action:exceed-2color-meter-action-type; description "mark loss-priority action type"; } identity violate-3color-meter-action-drop { base action:violate-3color-meter-action-type; description "drop action type in a meter"; } augment "/policy:policies/policy:policy-entry/" + "policy:classifier-entry/" + "policy:classifier-action-entry-cfg/" + "policy:action-cfg-params" { case mark-fwd-class { uses mark-fwd-class; description "Mark forwarding class in the packet"; } case mark-loss-priority { uses mark-loss-priority; description "Mark loss priority in the packet"; } case discard { uses action:discard; description "Discard action"; } description "Augments common diffserv policy actions"; } augment "/action:meter-template" + "/action:meter-entry" + "/action:meter-type" + "/action:one-rate-tri-color-meter-type" + "/action:one-rate-tri-color-meter" { leaf one-rate-color-aware { type boolean; description Choudhary, et al. Expires 7 September 2022 [Page 75] Internet-Draft YANG Models for QoS March 2022 "This defines if the meter is color-aware"; } } augment "/action:meter-template" + "/action:meter-entry" + "/action:meter-type" + "/action:two-rate-tri-color-meter-type" + "/action:two-rate-tri-color-meter" { leaf two-rate-color-aware { type boolean; description "This defines if the meter is color-aware"; } } /* example of augmenting a meter template with a /* vendor specific action */ augment "/action:meter-template" + "/action:meter-entry" + "/action:meter-type" + "/action:one-rate-two-color-meter-type" + "/action:one-rate-two-color-meter" + "/action:exceed-action" + "/action:exceed-2color-meter-action-params" + "/action:exceed-2color-meter-action-val" { case exceed-2color-meter-action-drop { description "meter drop"; uses action:drop; } case meter-action-mark-fwd-class { uses mark-fwd-class; description "Mark forwarding class in the packet"; } case meter-action-mark-loss-priority { uses mark-loss-priority; description "Mark loss priority in the packet"; } } augment "/action:meter-template" + "/action:meter-entry" + "/action:meter-type" + "/action:two-rate-tri-color-meter-type" + "/action:two-rate-tri-color-meter" + Choudhary, et al. Expires 7 September 2022 [Page 76] Internet-Draft YANG Models for QoS March 2022 "/action:violate-action" + "/action:violate-3color-meter-action-params" + "/action:violate-3color-meter-action-val" { case exceed-3color-meter-action-drop { description "meter drop"; uses action:drop; } description "Augment the actions to the two-color meter"; } augment "/action:meter-template" + "/action:meter-entry" + "/action:meter-type" + "/action:one-rate-tri-color-meter-type" + "/action:one-rate-tri-color-meter" + "/action:violate-action" + "/action:violate-3color-meter-action-params" + "/action:violate-3color-meter-action-val" { case exceed-3color-meter-action-drop { description "meter drop"; uses action:drop; } description "Augment the actions to basic meter"; } } module example-compb-queue-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:example-compb-queue-policy"; prefix queue-plcy; import ietf-qos-classifier { prefix classifier; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-policy { prefix policy; reference "RFC XXXX: YANG Model for QoS"; } organization "Company B"; contact Choudhary, et al. Expires 7 September 2022 [Page 77] Internet-Draft YANG Models for QoS March 2022 "Editor: XYZ "; description "This module defines a queue policy. The classification is based on aforwarding class, and the actions are queues. Copyright (c) 2021 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 2021-07-12 { description "Latest revision of Company B queue policy"; reference "RFC XXXX"; } identity forwarding-class { base classifier:filter-type; description "Forwarding class filter type"; } grouping forwarding-class-cfg { leaf forwarding-class-cfg { type string; description "forwarding-class name"; } description "Forwarding class filter"; } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:filter-entry" { /* Does NOT support "logical-not" of forwarding class. Use "must"? */ choice filter-params { description "Choice of filters"; Choudhary, et al. Expires 7 September 2022 [Page 78] Internet-Draft YANG Models for QoS March 2022 case forwarding-class-cfg { uses forwarding-class-cfg; description "Filter Type Internal-loss-priority"; } } description "Augments Diffserv Classifier with fwd class filter"; } identity compb-queue { base policy:action-type; description "compb-queue action type"; } grouping compb-queue-name { container queue-name { leaf name { type string; description "Queue class name"; } description "compb queue container"; } description "compb-queue grouping"; } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" { choice action-cfg-params { description "Choice of action types"; case compb-queue { uses compb-queue-name; } } description "Augment the queue actions to queue policy entry"; } } module example-compb-queue { yang-version 1.1; Choudhary, et al. Expires 7 September 2022 [Page 79] Internet-Draft YANG Models for QoS March 2022 namespace "urn:ietf:params:xml:ns:yang:ietf-compb-queue"; prefix compb-queue; import ietf-qos-action { prefix action; reference "RFC XXXX: YANG Model for QoS"; } organization "Company B"; contact "Editor: XYZ "; description "This module describes a compb queue module. This is a template for a queue within a queue policy, referenced by name. This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices."; revision 2021-07-12 { description "Latest revision of diffserv based classifier"; reference "RFC XXXX"; } container compb-queue { description "Queue used in compb architecture"; leaf name { type string; description "A unique name identifying this queue"; } uses action:queue; container excess-rate { choice excess-rate-type { case percent { leaf excess-rate-percent { type uint32 { range "1..100"; } description "excess-rate-percent"; } } case proportion { Choudhary, et al. Expires 7 September 2022 [Page 80] Internet-Draft YANG Models for QoS March 2022 leaf excess-rate-poroportion { type uint32 { range "1..1000"; } description "excess-rate-poroportion"; } } description "Choice of excess-rate type"; } description "Excess rate value"; } leaf excess-priority { type enumeration { enum high { description "High Loss Priority"; } enum medium-high { description "Medium-high Loss Priority"; } enum medium-low { description "Medium-low Loss Priority"; } enum low { description "Low Loss Priority"; } enum none { description "No excess priority"; } } description "Priority of excess (above guaranted rate) traffic"; } container buffer-size { choice buffer-size-type { case percent { leaf buffer-size-percent { type uint32 { range "1..100"; } description "buffer-size-percent"; } } case temporal { leaf buffer-size-temporal { Choudhary, et al. Expires 7 September 2022 [Page 81] Internet-Draft YANG Models for QoS March 2022 type uint64; units "microsecond"; description "buffer-size-temporal"; } } case remainder { leaf buffer-size-remainder { type empty; description "use remaining of buffer"; } } description "Choice of buffer size type"; } description "Buffer size value"; } } augment "/compb-queue" + "/queue-cfg" + "/algorithmic-drop-cfg" + "/drop-algorithm" { case random-detect { list drop-profile-list { key "priority"; description "map of priorities to drop-algorithms"; leaf priority { type enumeration { enum any { description "Any priority mapped here"; } enum high { description "High Priority Packet"; } enum medium-high { description "Medium-high Priority Packet"; } enum medium-low { description "Medium-low Priority Packet"; } enum low { description "Low Priority Packet"; } Choudhary, et al. Expires 7 September 2022 [Page 82] Internet-Draft YANG Models for QoS March 2022 } description "Priority of guaranteed traffic"; } leaf drop-profile { type string; description "drop profile to use for this priority"; } } } description "compb random detect drop algorithm config"; } } module example-compb-scheduler-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:" + "example-compb-scheduler-policy"; prefix scheduler-plcy; import ietf-qos-action { prefix action; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-policy { prefix policy; reference "RFC XXXX: YANG Model for QoS"; } organization "Company B"; contact "Editor: XYZ "; description "This module defines a scheduler policy. The classification is based on classifier-any, and the action is a scheduler."; revision 2021-07-12 { description "Initial revision of Company B Scheduler policy"; reference "RFC XXXX"; } identity queue-policy { Choudhary, et al. Expires 7 September 2022 [Page 83] Internet-Draft YANG Models for QoS March 2022 base policy:action-type; description "forwarding-class-queue action type"; } grouping queue-policy-name { container compb-queue-policy-name { leaf name { type string; description "Queue policy name"; } description "compb-queue-policy container"; } description "compb-queue policy grouping"; } augment "/policy:policies" + "/policy:policy-entry" + "/policy:classifier-entry" + "/policy:classifier-action-entry-cfg" { choice action-cfg-params { case schedular { uses action:schedular; } case queue-policy { uses queue-policy-name; } description "Augment the scheduler policy with a queue policy"; } } } A.3. Example of Company C Diffserv Model Company C vendor augmentation is based on Ericsson's implementation differentiated QoS. This implementation first sorts traffic based on a classifier, which can sort traffic into one or more traffic forwarding classes. Then, a policer or meter policy references the classifier and its traffic forwarding classes to specify different service levels for each traffic forwarding class. Because each classifier sorts traffic into one or more traffic forwarding classes, this type of classifier does not align with ietf- qos-classifier.yang, which defines one traffic forwarding class per Choudhary, et al. Expires 7 September 2022 [Page 84] Internet-Draft YANG Models for QoS March 2022 classifier. Additionally, Company C's policing and metering policies relies on the classifier's pre-defined traffic forwarding classes to provide differentiated services, rather than redefining the patterns within a policing or metering policy, as is defined in ietf- diffserv.yang. Due to these differences, even though Company C uses all the building blocks of classifier and policy, Company C's augmentation does not use ietf-diffserv.yang to provide differentiated service levels. Instead, Company C's augmentation uses the basic building blocks, ietf-qos-policy.yang to provide differentiated services. module example-compc-qos-policy { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:example-compc-qos-policy"; prefix "compcqos"; import ietf-qos-policy { prefix "pol"; reference "RFC XXXX: YANG Model for QoS"; } import ietf-qos-action { prefix "action"; reference "RFC XXXX: YANG Model for QoS"; } organization "Company C"; contact "Company C Editor: XYZ "; description "This module contains a collection of YANG definitions for configuring diffserv specification implementations. Copyright (c) 2021 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 2021-07-12 { description "Initial version"; reference "RFC XXXX"; } Choudhary, et al. Expires 7 September 2022 [Page 85] Internet-Draft YANG Models for QoS March 2022 /* identities */ identity compc-qos-policy { base pol:policy-type; description "compc-specific policy base type"; } identity mdrr-queuing-policy { base compc-qos-policy; description "compc-specific MDRR policy type"; } identity pwfq-queuing-policy { base compc-qos-policy; description "compc-specific queuing policy type"; } identity policing-policy { base compc-qos-policy; description "compc-specific policing policy type"; } identity metering-policy { base compc-qos-policy; description "compc-specific metering policy type"; } identity forwarding-policy { base compc-qos-policy; description "compc-specific forwarding policy type"; } identity overhead-profile-policy { base compc-qos-policy; description "compc-specific overhead profile policy type"; } identity resource-profile-policy { base compc-qos-policy; description "compc-specific resource profile policy type"; } identity protocol-rate-limit-policy { base compc-qos-policy; description "compc-specific protocol rate limit policy type"; } identity compc-qos-action { Choudhary, et al. Expires 7 September 2022 [Page 86] Internet-Draft YANG Models for QoS March 2022 base pol:action-type; description "compc-specificc qos action base type"; } /* groupings */ grouping redirect-action-grp { description "Redirection options grouping"; container redirect { description "Redirect options"; } } /* deviations */ deviation "/pol:policies/pol:policy-entry" { deviate add { must "pol:type = compc-qos-policy" { description "Only policy types drived from compc-qos-policy " + "are supported"; } } } deviation "/pol:policies/pol:policy-entry/pol:classifier-entry" { deviate add { must "../per-class-action = 'true'" { description "Only policies with per-class actions have classifiers"; } must "((../compcqos:sub-type != " + "'compcqos:mdrr-queuing-policy') and " + " (../compcqos:sub-type != " + "'compcqos:pwfq-queuing-policy')) or " + "(((../compcqos:sub-type = " + "'compcqos:mdrr-queuing-policy') or " + " (../compcqos:sub-type = " + "'compcqos:pwfq-queueing-policy')) and " + " ((classifier-entry-name = '0') or " + " (classifier-entry-name = '1') or " + " (classifier-entry-name = '2') or " + " (classifier-entry-name = '3') or " + " (classifier-entry-name = '4') or " + " (classifier-entry-name = '5') or " + " (classifier-entry-name = '6') or " + " (classifier-entry-name = '7') or " + " (classifier-entry-name = '8')))" { Choudhary, et al. Expires 7 September 2022 [Page 87] Internet-Draft YANG Models for QoS March 2022 description "MDRR queuing policy's or PWFQ queuing policy's " + "classifier-entry-name is limited to the listed values"; } } } deviation "/pol:policies/pol:policy-entry/pol:classifier-entry" + "/pol:classifier-action-entry-cfg" { deviate add { must "action-type = 'compcqos:compc-qos-action'" { description "Only compc-qos-action is allowed"; } max-elements 1; } } /* augments */ augment "/pol:policies/pol:policy-entry" { when "pol:policy-type = 'compc-qos-policy'" { description "Additional nodes only for diffserv-policy"; } description "Additional diffserv-policy nodes"; leaf sub-type { type identityref { base compc-qos-policy; } mandatory true; description "Policy sub-type. The value of this leaf must " + "not change once configured"; } leaf per-class-action { type boolean; must "(((. = 'true') and " + " ((../compcqos:sub-type = " + "'compcqos:policing-policy') or " + " (../compcqos:sub-type = " + "'compcqos:metering-policy') or " + " (../compcqos:sub-type = " + "'compcqos:mdrr-queuing-policy') or " + " (../compcqos:sub-type = " + "'compcqos:pwfq-queuing-policy') or " + " (../compcqos:sub-type = " + "'compcqos:forwarding-policy'))) or " + " ((. = 'false') and " + Choudhary, et al. Expires 7 September 2022 [Page 88] Internet-Draft YANG Models for QoS March 2022 " ((../compcqos:sub-type = " + "'compcqos:overhead-profile-policy') or " + " (../compcqos:sub-type = " + "'compcqos:resource-profile-policy') or " + " (../compcqos:sub-type = " + "'compcqos:protocol-rate-limit-policy'))))" { description "Only certain policies have per-class action"; } mandatory true; description "Per-class action"; } container traffic-classifier { when "../compcqos:sub-type = 'compcqos:policing-policy' or " + "../compcqos:sub-type = 'compcqos:metering-policy' or " + "../compcqos:sub-type = 'compcqos:forwarding-policy'" { description "A classifier for policing-policy or metering-policy"; } presence true; leaf name { type string; mandatory true; description "Traffic classifier name"; } leaf type { type enumeration { enum 'internal-dscp-only-classifier' { value 0; description "Classify traffic based on (internal) dscp only"; } enum 'ipv4-header-based-classifier' { value 1; description "Classify traffic based on IPv4 packet header fields"; } enum 'ipv6-header-based-classifier' { value 2; description "Classify traffic based on IPv6 packet header fields"; } } mandatory true; description "Traffic classifier type"; } Choudhary, et al. Expires 7 September 2022 [Page 89] Internet-Draft YANG Models for QoS March 2022 description "Traffic classifier"; } container traffic-queue { when "(../compcqos:sub-type = " + "'compcqos:mdrr-queuing-policy') or " + "(../compcqos:sub-type = " + "'compcqos:pwfq-queuing-policy')" { description "Queuing policy properties"; } leaf queue-map { type string; description "Traffic queue map for queuing policy"; } description "Traffic queue"; } container overhead-profile { when "../compcqos:sub-type = " + "'compcqos:overhead-profile-policy'" { description "Overhead profile policy properties"; } description "Overhead profile"; } container resource-profile { when "../compcqos:sub-type = " + "'compcqos:resource-profile-policy'" { description "Resource profile policy properties"; } description "Resource profile"; } container protocol-rate-limit { when "../compcqos:sub-type = " + "'compcqos:protocol-rate-limit-policy'" { description "Protocol rate limit policy properties"; } description "Protocol rate limit"; } } augment "/pol:policies/pol:policy-entry/pol:classifier-entry" + "/pol:classifier-action-entry-cfg/pol:action-cfg-params" { when "../../pol:policy-type = 'compc-qos-policy'" { description "Configurations for a classifier-policy-type policy"; Choudhary, et al. Expires 7 September 2022 [Page 90] Internet-Draft YANG Models for QoS March 2022 } case metering-or-policing-policy { when "../../compcqos:sub-type = " + "'compcqos:policing-policy' or " + "../../compcqos:sub-type = 'compcqos:metering-policy'" { } container dscp-marking { uses action:dscp-marking; description "DSCP marking"; } container precedence-marking { uses action:dscp-marking; description "Precedence marking"; } container priority-marking { uses action:priority; description "Priority marking"; } container rate-limiting { uses action:one-rate-two-color-meter; description "Rate limiting"; } } case mdrr-queuing-policy { when "../../compcqos:sub-type = " + "'compcqos:mdrr-queuing-policy'" { description "MDRR queue handling properties for the traffic " + "classified into current queue"; } leaf mdrr-queue-weight { type uint8 { range "20..100"; } units percentage; description "MDRR queue weight"; } } case pwfq-queuing-policy { when "../../compcqos:sub-type = " + "'compcqos:pwfq-queuing-policy'" { description "PWFQ queue handling properties for traffic " + "classified into current queue"; } leaf pwfq-queue-weight { type uint8 { range "20..100"; Choudhary, et al. Expires 7 September 2022 [Page 91] Internet-Draft YANG Models for QoS March 2022 } units percentage; description "Priority-based weighted fair queue weight"; } leaf pwfq-queue-priority { type uint8; description "Priority-based weighted fair queue priority"; } leaf pwfq-queue-rate { type uint8; description "Priority-based weighted fair queue rate"; } } case forwarding-policy { when "../../compcqos:sub-type = 'compcqos:forwarding-policy'" { description "Forward policy handling properties for traffic " + "in this classifier"; } uses redirect-action-grp; } description "Add the classify action configuration"; } } Authors' Addresses Aseem Choudhary Cisco Systems 170 W. Tasman Drive San Jose, CA 95134 United States of America Email: asechoud@cisco.com Mahesh Jethanandani Kloud Services Email: mjethanandani@gmail.com Choudhary, et al. Expires 7 September 2022 [Page 92] Internet-Draft YANG Models for QoS March 2022 Ebben Aries Juniper Networks 1194 North Mathilda Avenue Sunnyvale, CA 94089 United States of America Email: exa@juniper.net Ing-Wher Chen The MITRE Corporation Email: ingwherchen@mitre.org Choudhary, et al. Expires 7 September 2022 [Page 93]