<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE rfc [ <!ENTITY nbsp " "> <!ENTITY zwsp "​"> <!ENTITY nbhy "‑"> <!ENTITY wj "⁠"> ]> <?xml-stylesheet type="text/xsl" href="rfc2629.xslt" ?> <!-- generated by https://github.com/cabo/kramdown-rfc version1.7.291.7.30 (Ruby3.4.4)2.5.9) --> <rfc xmlns:xi="http://www.w3.org/2001/XInclude" ipr="trust200902"docName="draft-ietf-netmod-schedule-yang-10"docName="draft-ietf-netmod-schedule-yang-rfceditor-latest" category="std" consensus="true" submissionType="IETF" xml:lang="en" number="9922" tocInclude="true" sortRefs="true" symRefs="true" version="3"> <!-- xml2rfc v2v3 conversion3.30.03.31.0 --> <link href="https://datatracker.ietf.org/doc/draft-ietf-netmod-schedule-yang-rfceditor-latest" rel="prev"/> <front> <titleabbrev="Common Schedule YANG">Aabbrev="YANG Scheduling">A Common YANG Data Model for Scheduling</title> <seriesInfoname="Internet-Draft" value="draft-ietf-netmod-schedule-yang-10"/>name="RFC" value="9922"/> <author fullname="Qiufang Ma" role="editor"> <organization>Huawei</organization> <address> <postal> <street>101 Software Avenue, Yuhua District</street> <city>Jiangsu</city> <code>210012</code> <country>China</country> </postal> <email>maqiufang1@huawei.com</email> </address> </author> <author fullname="Qin Wu"> <organization>Huawei</organization> <address> <postal> <street>101 Software Avenue, Yuhua District</street> <city>Jiangsu</city> <code>210012</code> <country>China</country> </postal> <email>bill.wu@huawei.com</email> </address> </author> <author fullname="Mohamed Boucadair" role="editor"> <organization>Orange</organization> <address> <postal> <city>Rennes</city> <code>35000</code> <country>France</country> </postal> <email>mohamed.boucadair@orange.com</email> </address> </author> <author fullname="Daniel King"> <organization>Lancaster University</organization> <address> <postal> <country>United Kingdom</country> </postal> <email>d.king@lancaster.ac.uk</email> </address> </author> <dateyear="2025" month="August" day="07"/> <area>Operations and Management</area>year="2026" month="February"/> <area>OPS</area> <workgroup>netmod</workgroup> <keyword>calendaring</keyword> <keyword>scheduling</keyword> <keyword>YANG</keyword> <keyword>groupings</keyword> <abstract> <?line57?>95?> <!-- [rfced] FYI - We will do the following when we convert the file to RFCXML: - compact the spacing of the definition lists in Sections 8.1 and 8.2 --> <!--[rfced] Note that we have updated the short title, which appears in the running header in the PDF output, as follows. Please let us know of any objections. Original: Common Schedule YANG Current: YANG Scheduling --> <t>This document defines common types and groupings that are meant to be used for schedulingpurposespurposes, such asevent, policy,events, policies, services, or resources based on date and time. For the sake of better modularity, the YANG module includes a set of recurrence-related groupings with varying levels of representation (i.e., from basic to advanced) to accommodate a variety of requirements. It also defines groupings for validating requested schedules and reporting schedulingstatus.</t>statuses.</t> </abstract><note removeInRFC="true"> <name>Discussion Venues</name> <t>This note is to be removed before publishing as an RFC.</t> <t>Discussion of this document takes place on the Network Modeling (NETMOD) Working Group mailing list (netmod@ietf.org), which is archived at <eref target="https://mailarchive.ietf.org/arch/browse/netmod/"/>.</t> <t>Source for this draft and an issue tracker can be found at <eref target="https://github.com/netmod-wg/schedule-yang"/>.</t> </note></front> <middle> <?line66?>120?> <section anchor="intro"> <name>Introduction</name> <t>This document defines a common schedule YANG module ("ietf-schedule") that can be used in several scheduling contexts, e.g., (but not limited to) <xref target="I-D.ietf-opsawg-ucl-acl"/>, <xref target="I-D.ietf-opsawg-scheduling-oam-tests"/>, and <xref target="I-D.ietf-tvr-schedule-yang"/>. The module includes a set of reusable groupingswhichthat are designed to be applicable for schedulingpurposespurposes, such asevent, policy, servicesevents, policies, services, or resources based on date and time. It also defines groupings for validating requested schedules and reporting schedulingstatus.</t>statuses.</t> <t>This document does not make any assumption about the nature of actions that are triggered by the schedules. Detection and resolution of any schedule conflicts are beyond the scope of this document.</t> <!--[rfced] To avoid awkward hyphenation, may we update this sentence to read as "objects managed by MIB"? Original: Section 5 discusses the relationship with the Management Information Base (MIB) managed objects for scheduling management operations defined in [RFC3231]. Perhaps: Section 5 discusses the relationship with the objects managed by Management Information Base (MIB) for scheduling management operations defined in [RFC3231]. --> <t><xref target="sec-mib"/> discusses the relationship with the Management Information Base (MIB) managed objects for scheduling management operations defined in <xref target="RFC3231"/>.</t> <t><xref target="usage"/> describes a set of examples to illustrate the use of the common schedule groupings (<xref target="sec-grp"/>). <xref target="sec-ext"/> provides sample modules to exemplify how future modules can use the extensibility provisions in the "ietf-schedule" module (<xref target="sec-schedule"/>). Also, <xref target="ex-framework"/> provides an example of using the "ietf-schedule" module for scheduled use of a resources framework (e.g., <xref target="RFC8413"/>).</t><section anchor="editorial-note-to-be-removed-by-rfc-editor"> <name>Editorial Note (To be removed by RFC Editor)</name> <t>Note to the RFC Editor: This section is to be removed prior to publication.</t> <t>This document contains placeholder values that need to be replaced with finalized values at the time of publication. This note summarizes all of the substitutions that are needed. No other RFC Editor instructions are specified elsewhere in this document.</t> <t>Please apply the following replacements:</t> <ul spacing="normal"> <li> <t>XXXX --> the assigned RFC number for this draft</t> </li> <li> <t>2025-05-30 --> the actual date of the publication of this document</t> </li> </ul> </section></section> <section anchor="conventions-and-definitions"> <name>Conventions and Definitions</name> <t>The key words "<bcp14>MUST</bcp14>", "<bcp14>MUST NOT</bcp14>", "<bcp14>REQUIRED</bcp14>", "<bcp14>SHALL</bcp14>", "<bcp14>SHALL NOT</bcp14>", "<bcp14>SHOULD</bcp14>", "<bcp14>SHOULD NOT</bcp14>", "<bcp14>RECOMMENDED</bcp14>", "<bcp14>NOT RECOMMENDED</bcp14>", "<bcp14>MAY</bcp14>", and "<bcp14>OPTIONAL</bcp14>" in this document are to be interpreted as described in BCP 14 <xref target="RFC2119"/> <xref target="RFC8174"/> when, and only when, they appear in all capitals, as shown here.</t> <?line -18?> <t>The meanings of the symbols in tree diagrams are defined in <xref target="RFC8340"/>.</t> <t>This document uses the YANG terminology defined in <xref section="3" sectionFormat="of" target="RFC7950"/>.</t><t>The<t>This document makes use of the following terms:</t> <dl> <dt>Recurrence rule:</dt> <dd> <t>Refers to a rule or repeating pattern for recurring events. See also <xref section="3.8.5.3" sectionFormat="of" target="RFC5545"/> for a comprehensive iCalendar recurrence rule specification.</t> </dd> <dt>Recurrence instance (or Recurrence, for short):</dt> <dd> <t>Refers to an instance that matches a recurrence rule.</t> </dd> <dt>Recurrence set:</dt> <dd> <t>Refers to a set of recurrence instances.</t> </dd> <dt>Frequency:</dt> <dd> <t>Characterizes the type of a recurrence rule. Values are taken from the "FREQ" rule in <xref section="3.3.10" sectionFormat="of" target="RFC5545"/>.</t> </dd> <dt/> <dd> <t>For example, repeating events based on an interval of a second or more are classified as recurrence with a frequency value of "SECONDLY". Frequency values defined as identities in the YANG module are used in lowercase.</t> </dd> <dt>iCalendar:</dt> <dd> <t>Refers to Internet Calendaring per <xref target="RFC5545"/>.</t> </dd> <dt>Interval:</dt> <dd> <t>Refers to an integer that specifies the interval at which a recurrence rule repeats. Values are taken from the "INTERVAL" rule in <xref section="3.3.10" sectionFormat="of" target="RFC5545"/>.</t> </dd> <dt/> <dd> <t>For example,"1","1" means every second for a secondly rule, every minute for a minutely rule, every hour for an hourly rule, etc.</t> </dd> <dt>System:</dt> <dd> <t>Refers to an entity that hosts a schedule that is managed using the YANG module defined in this document.</t> </dd> </dl> </section> <section anchor="sec-overview"> <name>Module Overview</name> <section anchor="sec-features"> <name>Features</name> <t>The "ietf-schedule" data model defines therecurrence relatedrecurrence-related groupings using a modular approach. To that aim, a variety of representations of recurrence groupings ranging from basic to advanced (iCalender-like) are defined. To allow for different options, two features are defined in the data model:</t> <ul spacing="normal"> <li> <t>"basic-recurrence"</t> </li> <li> <t>"icalendar-recurrence"</t> </li> </ul> <t>Refer toSections<xrefformat="counter"target="sec-aug"/> and <xrefformat="counter"target="features"/> for the use of these features.</t> </section> <section anchor="sec-types"> <name>Types and Identities</name> <t>The "ietf-schedule" module (<xref target="sec-schedule"/>) defines the following identities:</t> <ul spacing="normal"> <li> <t>"schedule-type": Indicates the type ofaschedule. The following types are defined so far: </t> <ul spacing="normal"> <li> <t>one-shot: The schedule will trigger an action that has either the duration specified as 0 or the end time specified as the same as the start time, and then the schedule will disable itself (<xref section="3.3" sectionFormat="of" target="RFC3231"/>).</t> </li> <li> <t>period:The scheduleThis type is used for a period-based schedule consisting of either (1) a start and end or (2) a start and positive duration of time. If neither an end nor a duration is indicated, the period is considered to last forever.</t> </li> <li> <t>recurrence: This type is used for a recurrence-based schedule. A recurrence may be periodic (i.e., repeat over the same period, e.g., every five minutes) or not (i.e., repeat in a non-regular manner, e.g., every day at 8 and 9 AM).</t> </li> </ul> </li> <li> <t>"frequency-type": Characterizes the repeating interval rule of a recurrence schedule (secondly, minutely, etc.).</t> </li> <li> <t>"schedule-state": Indicates the status of a schedule (enabled, disabled, conflicted, finished, etc.). This identity can also be used to manage the state of individual instances of a recurrence-based schedule.</t> </li> <li> <t>"discard-action-type": Specifies the action for the responder to take (e.g., generate a warning or an error message) when a requested schedule cannot be accepted for any reason and is discarded.</t> </li> </ul> </section> <section anchor="sec-grp"> <name>Scheduling Groupings</name> <t>The "ietf-schedule" module (<xref target="sec-schedule"/>) defines the following groupings:</t> <ul spacing="normal"> <li> <t>"generic-schedule-params" (<xref target="sec-gen"/>)</t> </li> <li> <t>"period-of-time" (<xref target="sec-period"/>)</t> </li> <li> <t>"recurrence-basic" (<xref target="sec-rec"/>)</t> </li> <li> <t>"recurrence-utc" (<xref target="sec-rec-utc"/>)</t> </li> <li> <t>"recurrence-with-time-zone" (<xref target="sec-rec-tz"/>)</t> </li> <li> <t>"recurrence-utc-with-periods" (<xref target="sec-rec-utc-dt"/>)</t> </li> <li> <t>"recurrence-time-zone-with-periods" (<xref target="sec-rec-tz-dt"/>)</t> </li> <li> <t>"icalendar-recurrence" (<xref target="sec-ical-rec"/>)</t> </li> <li> <t>"schedule-status", "schedule-status-with-time-zone", and "schedule-status-with-name" (<xref target="sec-schedule-status"/>)</t> </li> </ul> <t>Examples are provided in <xref target="usage"/>.</t> <section anchor="sec-gen"> <name>The "generic-schedule-params" Grouping</name> <t>A system accepts and handles schedule requests, which may help further automate the scheduling process of events,policy,policies, services, or resources based on date and time. The "generic-schedule-params" grouping (<xref target="gsp-tree"/>) specifies a set of configuration parameters that are used by a system for validating requested schedules.</t> <figure anchor="gsp-tree"> <name>'generic-schedule-params' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping generic-schedule-params: +-- description? string +-- time-zone-identifier? sys:timezone-name +-- validity? yang:date-and-time +-- max-allowed-start? yang:date-and-time +-- min-allowed-start? yang:date-and-time +-- max-allowed-end? yang:date-and-time +-- discard-action? identityref]]></artwork>]]></sourcecode> </figure> <t>The "description" parameter includes a description of the schedule. No constraint is imposed on the structure nor the use of this parameter.</t> <t>The "time-zone-identifier" parameter, if provided, specifies the time zone reference <xref target="RFC7317"/> of the local date and time values. This parameter <bcp14>MUST</bcp14> be specified if any of the date and time values are in the format of local time. It <bcp14>MUST NOT</bcp14> be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC.</t> <!--[rfced] Please clarify "to execute independent of when it ends". Is the meaning that the validity parameter determines when a schedule can be started and thus "executed independently from when it ends"? Original: It determines the latest time that a schedule can be started to execute independent of when it ends and takes precedence over similar attributes that are provided at the schedule instance itself. Perhaps: It determines the latest time that a schedule can be started and thus executed independently from when it ends, and it takes precedence over similar attributes that are provided at the schedule instance itself. --> <t>The "validity" parameter specifies the date and time after which a schedule will not be considered as valid. It determines the latest time that a schedule can be started to execute independent of when itendsends, and it takes precedence over similar attributes that are provided at the schedule instance itself. A requested schedule may still beacceptedaccepted, but any occurrences that start later than the configured value will not be executed.</t> <t>The "max/min-allowed-start" parameters specify the maximum/minimum scheduled start date and time. A requested schedule will be rejected if the first occurrence of the schedule starts later/earlier than the configured values.</t> <t>The "max-allowed-end" parameter specifies the maximum allowed end time of the last occurrence. A requested schedule will be rejected if the end time of the last occurrence is later than the configured "max-allowed-end" value.</t> <t>The "discard-action" parameter specifies the action if a requested schedule cannot be accepted for any reason and is discarded. Possible reasons include, but are not limited to, the requested schedule failing to satisfy the guards in this grouping, conflicting with existing schedules, or being out-of-date (e.g., the expected startishas already passed).</t> <!--[rfced] May we update this sentence to make the two items mentioned (i.e., "all schedules on a system" and "too short schedule requests") more parallel and thus easier to read? Original: These parameters apply to all schedules on a system and are meant to provide guards against stale configuration, too short schedule requests that would prevent validation by admins of some critical systems, etc. Perhaps: These parameters apply to all schedules on a system and are meant to provide guards against stale configuration, schedule requests that are too short and that would thus prevent validation by admins of some critical systems, etc. --> <t>*</t> <t>These parameters apply to all schedules on a system and are meant to provide guards against stale configuration, too short schedule requests that would prevent validation by admins of some critical systems, etc.</t> </section> <section anchor="sec-period"> <name>The "period-of-time" Grouping</name> <t>The "period-of-time" grouping (<xref target="pt-tree"/>) represents a time period using either a start date and time ("period-start") and end date and time("period-end"),("period-end") or a start date and time ("period-start") and a non-negative time duration ("duration"). For the first format, the start of the period <bcp14>MUST</bcp14> be no later than the end of the period. If neither an end date and time ("period-end") nor a duration ("duration") is indicated, the period is considered to last forever. If the duration ("duration") value is 0 or the end time ("period-end") is the same as the start time ("period-start"), the period is considered as a one-shot schedule. If no start date and time ("period-start") is specified, the period is considered to start immediately.</t> <t>The "time-zone-identifier" parameter indicates the identifier for the time zone. This parameter <bcp14>MUST</bcp14> be specified if either the "period-start" or "period-end" value is reported in local time format. It <bcp14>MUST NOT</bcp14> be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC.</t> <t>The "period-description" parameter includes a description of the period. No constraint is imposed on the structure nor the use of this parameter.</t> <figure anchor="pt-tree"> <name>'period-of-time' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping period-of-time: +-- period-description? string +-- period-start? yang:date-and-time +-- time-zone-identifier? sys:timezone-name +-- (period-type)? +--:(explicit) | +-- period-end? yang:date-and-time +--:(duration) +-- duration? duration]]></artwork>]]></sourcecode> </figure> </section> <section anchor="sec-rec"> <name>The "recurrence-basic" Grouping</name> <t>The "recurrence-basic" grouping (<xref target="rec-grp-tree"/>) specifies a simple recurrence rulewhichthat starts immediately and repeats forever.</t> <figure anchor="rec-grp-tree"> <name>'recurrence-basic' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping recurrence-basic: +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32]]></artwork>]]></sourcecode> </figure> <t>The frequency parameter ("frequency") identifies the type ofarecurrence rule. For example, a "daily" frequency value specifies repeating events based on an interval of a day or more.</t> <t>Consistent with <xref section="3.3.10" sectionFormat="of" target="RFC5545"/>, the interval parameter ("interval") represents at which interval the recurrence rule repeats. For example, within a "daily" recurrence rule, an interval value of "8" means every eight days.</t><t>Note<!-- [rfced] We note that Section 4.13 of [I-D.ietf-netmod-rfc8407bis] mentions "default" but doesn't mention "mandatory"; however, Section 4.14 mentions both "default" and "mandatory". Should the citations below be updated to point to Section 4.14 instead? Original (Section 3.3.3): Note that per Section 4.13 of [I-D.ietf-netmod-rfc8407bis], neither a "default" nor a "mandatory" substatement is defined here for both "frequency" and "interval" parameters because there are cases (e.g., profiling) where using these statements is problematic. Original (Section 3.3.8): Note that per Section 4.13 of [I-D.ietf-netmod-rfc8407bis], neither a "default" nor a "mandatory" substatement is defined here because there are cases (e.g., profiling) where using these statements is problematic. --> <t>Note that, per <xref section="4.13" sectionFormat="of" target="I-D.ietf-netmod-rfc8407bis"/>, neither a "default" nor a "mandatory" substatement is defined here for both "frequency" and "interval" parameters because there are cases (e.g., profiling) where using these statements is problematic. YANG modules using this grouping <bcp14>SHOULD</bcp14> refine these two nodes with either a "mandatory" or a "default"statement,statement if they always need to be configured or have default values. This recommendation <bcp14>MAY</bcp14> be ignored in cases such as when this grouping is used by another grouping.</t> <t>The "recurrence-description" parameter includes a description of the period. No constraint is imposed on the structure nor the use of this parameter.</t> </section> <section anchor="sec-rec-utc"> <name>The "recurrence-utc" Grouping</name> <t>The "recurrence-utc" grouping (<xref target="rec-utc-grp-tree"/>) uses the "recurrence-basic" grouping (<xref target="sec-rec"/>) and specifies a simple recurrence rule in UTC format.</t> <figure anchor="rec-utc-grp-tree"> <name>'recurrence-utc' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping recurrence-utc: +-- recurrence-first | +-- start-time-utc? yang:date-and-time | +-- duration? uint32 +-- (recurrence-end)? | +--:(until) | | +-- utc-until? yang:date-and-time | +--:(count) | +-- count? uint32 +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32]]></artwork>]]></sourcecode> </figure> <t>The "start-time-utc" parameter indicates the start time in UTC format.</t> <t>The "duration" parameter specifies, in units of seconds, the time period of the first occurrence. Unless specified otherwise (e.g., through additional augmented parameters), the "duration" also applies to subsequent recurrence instances. When unspecified, each occurrence is considered as immediate completion (e.g., execute an immediate command that is considered to complete quickly) or hard to compute an exact duration (e.g., run a data analysis script whose execution time may depend on the data volume and computation resource availability). The behavior to follow when a task takes more time than specified by the "duration" is out of scope. Such considerations belong to task management, not schedule management.</t> <t>Note that the "interval" and "duration" cover two distinct properties of a schedule event. The interval specifies when a schedule will occur, combined with the frequencyparameter;parameter, while the duration indicates how long an occurrence will last. This document allows the interval between occurrences to be shorter than the duration of each occurrence (e.g., a recurring event is scheduled to start every day for a duration of 2 days).</t> <t>The repetition can be scoped by a specified end time or by a count of occurrences, indicated by the "recurrence-end" choice. The "count" value <bcp14>MUST</bcp14> be greater than 1, and the "start-time-utc" value always counts as the first occurrence.</t> <t>The "recurrence-utc" grouping is designed to be reused in scheduling contexts where machine readability is more desirable.</t> </section> <section anchor="sec-rec-tz"> <name>The "recurrence-with-time-zone" Grouping</name> <t>The "recurrence-with-time-zone" grouping (<xref target="rec-tz-grp-tree"/>) uses the "recurrence-basic" grouping (<xref target="sec-rec"/>) and specifies a simple recurrence rule with a time zone.</t> <figure anchor="rec-tz-grp-tree"> <name>'recurrence-with-time-zone' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping recurrence-with-time-zone: +-- recurrence-first | +-- start-time? yang:date-and-time | +-- duration? duration +-- time-zone-identifier? sys:timezone-name +-- (recurrence-end)? | +--:(until) | | +-- until? yang:date-and-time | +--:(count) | +-- count? uint32 +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32]]></artwork>]]></sourcecode> </figure> <t>The "recurrence-first" container includes "start-time" and "duration" parameters to specify the start time and period of the first occurrence. Unless specified otherwise (e.g., through additional augmented parameters), the "duration" also applies to subsequent recurrence instances. When unspecified, each occurrence is considered as immediate completion (e.g., execute an immediate command that is considered to complete quickly) or hard to compute an exact duration (e.g., run a data analysis script whose execution time may depend on the data volume and computation resource availability).</t> <t>The grouping also includes a "time-zone-identifier"parameterparameter, which <bcp14>MUST</bcp14> be specified if either the "start-time" or "until" value is reported in local time format. It <bcp14>MUST NOT</bcp14> be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC.</t> <t>The repetition can be scoped by a specified end time or by a count of occurrences, indicated by the "recurrence-end" choice. The "count" value <bcp14>MUST</bcp14> be greater than 1, and the "start-time" value always counts as the first occurrence.</t> <t>The considerations discussed in <xref target="sec-rec-utc"/> for "interval" and "duration" are also applicable to "recurrence-with-time-zone".</t> <t>Unlike the definition of the "recurrence-utc" grouping (<xref target="sec-rec-utc"/>), "recurrence-with-time-zone" is intended to promote human readability over machine readability.</t> </section> <section anchor="sec-rec-utc-dt"> <name>The "recurrence-utc-with-periods" Grouping</name> <t>The "recurrence-utc-with-periods" grouping (<xref target="rec-utc-dt-grp-tree"/>) uses the "recurrence-utc" grouping (<xref target="sec-rec-utc"/>) and adds a "period-timeticks" list to define an aggregate set of repeating occurrences.</t> <figure anchor="rec-utc-dt-grp-tree"> <name>'recurrence-utc-with-periods' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping recurrence-utc-with-periods: +-- recurrence-first | +-- start-time-utc? yang:date-and-time | +-- duration? uint32 +-- (recurrence-end)? | +--:(until) | | +-- utc-until? yang:date-and-time | +--:(count) | +-- count? uint32 +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32 +-- period-timeticks* [period-start] +-- period-start yang:timeticks +-- period-end? yang:timeticks]]></artwork>]]></sourcecode> </figure> <!--[rfced] For conciseness, may we shorten "the value indicated by the value of the..." in the sentence below as follows? Original: The value of the "period-start" instance MUST NOT exceed the value indicated by the value of "frequency" instance... Perhaps: The value of the "period-start" instance MUST NOT exceed the value of the "frequency" instance... --> <t>The recurrence instances are specified by the union of occurrences defined by both the recurrence rule and "period-timeticks" list. This list uses the "yang:timeticks" type defined in <xref target="RFC6991"/>. Duplicate instances are ignored. The value of the "period-start" instance <bcp14>MUST NOT</bcp14> exceed the value indicated by the value of the "frequency" instance, i.e., thetimeticks"timeticks" value must not exceed 100 in a secondly recurrence rule, and it must not exceed 6000 in a minutely recurrence rule, and so on.</t> </section> <section anchor="sec-rec-tz-dt"> <name>The "recurrence-time-zone-with-periods" Grouping</name> <t>The "recurrence-time-zone-with-periods" grouping (<xref target="rec-tz-dt-grp-tree"/>) uses the "recurrence-with-time-zone" grouping (<xref target="sec-rec-tz"/>) and adds a "period" list to define an aggregate set of repeating occurrences.</t> <figure anchor="rec-tz-dt-grp-tree"> <name>'recurrence-time-zone-with-periods' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping recurrence-time-zone-with-periods: +-- recurrence-first | +-- start-time? yang:date-and-time | +-- duration? duration +-- time-zone-identifier? sys:timezone-name +-- (recurrence-end)? | +--:(until) | | +-- until? yang:date-and-time | +--:(count) | +-- count? uint32 +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32 +-- period* [period-start] +-- period-description? string +-- period-start yang:date-and-time +-- time-zone-identifier? sys:timezone-name +-- (period-type)? +--:(explicit) | +-- period-end? yang:date-and-time +--:(duration) +-- duration? duration]]></artwork>]]></sourcecode> </figure> <t>The recurrence instances are specified by the union of occurrences defined by both the recurrence rule and "period" list. Duplicate instances are ignored.</t> </section> <section anchor="sec-ical-rec"> <name>The "icalendar-recurrence" Grouping</name> <t>The "icalendar-recurrence" grouping (<xref target="ical-grp-tree"/>) uses the "recurrence-time-zone-with-periods" grouping (<xref target="sec-rec-tz-dt"/>) and defines more data nodes to enrich the definition of recurrence. The structure of the "icalendar-recurrence" grouping refers to the definition of the recurrence component defined in Sections <xref target="RFC5545" section="3.3.10" sectionFormat="bare"/> and <xref target="RFC5545" section="3.8.5" sectionFormat="bare"/> of <xref target="RFC5545"/>.</t> <figure anchor="ical-grp-tree"> <name>'icalendar-recurrence' Grouping Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping icalendar-recurrence: +-- recurrence-first | +-- start-time? yang:date-and-time | +-- duration? duration +-- time-zone-identifier? sys:timezone-name +-- (recurrence-end)? | +--:(until) | | +-- until? yang:date-and-time | +--:(count) | +-- count? uint32 +-- recurrence-description? string +-- frequency? identityref +-- interval? uint32 +-- period* [period-start] | +-- period-description? string | +-- period-start yang:date-and-time | +-- time-zone-identifier? sys:timezone-name | +-- (period-type)? | +--:(explicit) | | +-- period-end? yang:date-and-time | +--:(duration) | +-- duration? duration +-- bysecond* uint32 +-- byminute* uint32 +-- byhour* uint32 +-- byday* [weekday] | +-- direction* int32 | +-- weekday schedule:weekday +-- bymonthday* int32 +-- byyearday* int32 +-- byyearweek* int32 +-- byyearmonth* uint32 +-- bysetpos* int32 +-- workweek-start? schedule:weekday +-- exception-dates* yang:date-and-time]]></artwork>]]></sourcecode> </figure> <t>An array of the "bysecond" (or"byminute","byminute" or "byhour") specifies a list of seconds within a minute (or minutes within anhour,hour or hours of the day). For example, within a "minutely" recurrence rule, the values of "byminute" node "10" and "20"meansmean the occurrences are generated at the 10th and 20th minute within an hour, reducing the number of recurrence instances from all minutes.</t> <t>The parameter "byday" specifies a list of days of the week, with an optional directionwhichthat indicates the nth occurrence of a specific day within the "monthly" or "yearly" frequency instance. Valid values of "direction" are 1 to 5 or -5 to -1 within a "monthly" recurrencerule;rule and 1 to 53 or -53 to -1 within a "yearly" recurrence rule. For example, within a "monthly" rule, the "weekday" with a value of "monday" and the "direction" with a value of "-1" represents the last Monday of the month.</t> <t>An array of the "bymonthday" (or byyearday", "byyearweek", or "byyearmonth") specifies a list of days of the month (or days of the year, weeks of the year, or months of the year). For example, within a "yearly" recurrence rule, the values of "byyearmonth"instanceinstances "1" and "2"meansmean the occurrences are generated in January and February, increasing the "yearly" recurrence from every year to every January and February of the year.</t> <t>The "bysetpos" conveys a list of values that corresponds to the nth occurrence within the set of recurrence instances to be specified. For example, in a "monthly" recurrence rule, the "byday" data node specifies every Monday of the week, and the "bysetpos" with a value of "-1" represents the last Monday of the month. Not setting the "bysetpos" data node represents every Monday of the month.</t> <t>The "workweek-start" data node specifies the day on which the week starts. This is significant when a "weekly" recurrence rule has an interval greater than 1, and a "byday" data node is specified. This is also significant when in a "yearly" rule and a "byyearweek" is specified. Notethatthat, per <xref section="4.13" sectionFormat="of" target="I-D.ietf-netmod-rfc8407bis"/>, neither a "default" nor a "mandatory" substatement is defined here because there are cases (e.g., profiling) where using these statements is problematic. YANG modules using this grouping <bcp14>SHOULD</bcp14> refine the "workweek-start" node with either a "mandatory" or a "default"statement,statement if it always needs to be configured or has a default value. This <bcp14>MAY</bcp14> be ignored in cases such as when this grouping is used by another grouping.</t> <t>The "exception-dates" data node specifies a list of exceptions for recurrence. The final recurrence set is generated by gathering all of the date and time values created by any of the specified recurrencerulerules anddate-times,date-times and then excluding any start date and time values specified by "exception-dates" parameter.</t> </section> <section anchor="sec-schedule-status"> <name>The "schedule-status", "schedule-status-with-time-zone", and "schedule-status-with-name" Groupings</name> <t>The "schedule-status", "schedule-status-with-time-zone", and "schedule-status-with-name" groupings (<xref target="sche-status-tree"/>) define common parameters for scheduling management/status exposure. The "schedule-status-with-time-zone" grouping has the same structure as "schedule-status" but with an additional parameter to identify a time zone. Similarly, the "schedule-status-with-name" grouping has the same structure as "schedule-status" but with an additional parameter to identify a schedule "schedule-name". These structures are defined in the module to allow for better modularity and flexibility.</t> <!--[rfced] In the title of Figure 9, is the asterisk (*) in "schedule-status-*" correct? We ask as we do not see this elsewhere in the document. Current: Figure 9: 'schedule-status-*' Groupings Tree Structure Perhaps: Figure 9: 'schedule-status' Groupings Tree Structure --> <figure anchor="sche-status-tree"> <name>'schedule-status-*' Groupings Tree Structure</name><artwork><![CDATA[<sourcecode type="yangtree"><![CDATA[ grouping schedule-status: +-- state? identityref +-- version? uint16 +-- schedule-type? identityref +--ro local-time? yang:date-and-time +--ro last-update? yang:date-and-time +--ro counter? yang:counter32 +--ro last-occurrence? yang:date-and-time +--ro upcoming-occurrence? yang:date-and-time +--ro last-failed-occurrence? yang:date-and-time +--ro failure-counter? yang:counter32 grouping schedule-status-with-time-zone: +--ro time-zone-identifier? sys:timezone-name +-- schedule-name? string +-- state? identityref +-- version? uint16 +-- schedule-type? identityref +--ro local-time? yang:date-and-time +--ro last-update? yang:date-and-time +--ro counter? yang:counter32 +--ro last-occurrence? yang:date-and-time +--ro upcoming-occurrence? yang:date-and-time +--ro last-failed-occurrence? yang:date-and-time +--ro failure-counter? yang:counter32 grouping schedule-status-with-name: +-- schedule-name? string +-- state? identityref +-- version? uint16 +-- schedule-type? identityref +--ro local-time? yang:date-and-time +--ro last-update? yang:date-and-time +--ro counter? yang:counter32 +--ro last-occurrence? yang:date-and-time +--ro upcoming-occurrence? yang:date-and-time +--ro last-failed-occurrence? yang:date-and-time +--ro failure-counter? yang:counter32]]></artwork>]]></sourcecode> </figure> <t>The "schedule-name" parameter is useful to uniquely identify a schedule in a network device or controller if multiple scheduling contexts exist.</t> <t>The "state" parameter is defined to configure/expose the scheduling state, depending on the use of the grouping. For a recurrence-based schedule, it represents the state of the overall recurrence. The "identityref" type is used for this parameter to allow extensibility in future modules.</t> <t>The "version" parameter is used to track the current schedule version information. The version can be incremented by the entity that created the schedule. The "last-update" parameter identifies when the schedule was last modified. In some contexts, this parameter can be used to track the configuration of a given schedule. In such cases, the "version" may not be used.</t> <t>The "schedule-type" parameter identifies the type of the current schedule. The "counter", "last-occurrence", and "upcoming-occurrence" data nodes are only available when the "schedule-type" is "recurrence".</t> <t>When no time zone is included, "local-time" reports the actual local time as seen by the entity that hosts a schedule. This parameter can be used by a controller to infer the offset to UTC. This use is similar to the use of "schedLocalTime" in <xref target="RFC3231"/>.</t> <t>"last-failed-occurrence" and "failure-counter" report the last failure that occurred and the count of failures for this schedule. Unless new parameters/operations are defined to allow the count of failures to be reset, "failure-counter" is reset by default only when the schedule starts.</t> <t>The current groupings capture common parameters that are applicable to typical scheduling contexts known so far. Future modules can define other useful parameters as needed. For example, in a scheduling context with multiple system sources to feed the schedules, the "source" and "precedence" parameters may be needed to reflect how schedules from different sources should be prioritized.</t> </section> </section> <section anchor="sec-aug"> <name>Features Use and Augmentations</name> <t><xref target="features"/> provides an example about how the features defined in <xref target="sec-features"/> can be used. Implementations may support a basic recurrence rule or an advancedoneone, as needed, by declaring different features. Whether only one or both features are supported is implementation specific and depends on the specific scheduling context.</t> <t>The common schedule groupings (<xref target="sec-grp"/>) can also be augmented to support specific needs. As an example, <xref target="augments"/> demonstrates how additional parameters can be added to comply with specific schedule needs.</t> </section> </section> <section anchor="some-usage-restrictions"> <name>Some Usage Restrictions</name> <t>There are some restrictions that need to be followed when using groupings defined in the "ietf-schedule" YANG module (<xref target="sec-grp"/>):</t> <ul spacing="normal"> <li> <t>The instant in time represented by "period-start" <bcp14>MUST</bcp14> be before the "period-end" for the "period-of-time" grouping (<xref target="sec-period"/>).</t> </li> <li> <t>The combination of the day, month, and year represented for date and time values <bcp14>MUST</bcp14> be valid. See <xref section="5.7" sectionFormat="of" target="RFC3339"/> for the maximum day number based on the month and year.</t> </li> <li> <t>Unless deployed in contexts where time synchronization is not subject to leap second adjustments (e.g., <xref section="4.3" sectionFormat="of" target="I-D.ietf-ntp-ntpv5"/>), the second for date and time values <bcp14>SHOULD</bcp14> have the value "60" at the end of months in which a leap second occurs.</t> </li> <li> <t>Schedules received with a starting time in the past with respect to current time <bcp14>SHOULD</bcp14> be ignored. When a local policy is provided, an implementation <bcp14>MAY</bcp14> omit the past occurrences and start immediately (e.g., for a period-based schedule) orstartsstart from the date and time when the recurrence pattern is first satisfied from the current time (e.g., for a recurrence-based schedule).</t> </li> </ul> </section> <section anchor="sec-mib"> <name>Relationship to the DISMAN-SCHEDULE-MIB</name> <t><xref target="RFC3231"/> specifies a Management Information Base (MIB) used to schedule management operations periodically or at specified dates and times.</t> <t>Although no data nodes are defined in this document, <xref target="mapping"/> lists how the main objects in the DISMAN-SCHEDULE-MIB can be mapped to YANG parameters.</t> <table anchor="mapping"> <name>YANG/MIB Mapping</name> <thead> <tr> <th align="left">MIB Object</th> <th align="left">YANG</th> </tr> </thead> <tbody> <tr> <td align="left">schedLocalTime</td> <td align="left">local-time</td> </tr> <tr> <td align="left">schedType</td> <td align="left">schedule-type</td> </tr> <tr> <td align="left">schedName</td> <td align="left">schedule-name</td> </tr> <tr> <td align="left">schedOwner</td> <td align="left">Not Supported</td> </tr> <tr> <td align="left">schedDescr</td> <td align="left">description</td> </tr> <tr> <td align="left">schedInterval</td> <td align="left">interval</td> </tr> <tr> <td align="left">schedWeekDay</td> <td align="left">weekday</td> </tr> <tr> <td align="left">schedMonth</td> <td align="left">byyearmonth</td> </tr> <tr> <td align="left">schedDay</td> <td align="left">bymonthday</td> </tr> <tr> <td align="left">schedHour</td> <td align="left">byhour</td> </tr> <tr> <td align="left">schedMinute</td> <td align="left">byminute</td> </tr> <tr> <td align="left">schedContextName</td> <td align="left">Not Supported</td> </tr> <tr> <td align="left">schedAdminStatus</td> <td align="left">state</td> </tr> <tr> <td align="left">schedOperStatus</td> <td align="left">state</td> </tr> <tr> <td align="left">schedFailures</td> <td align="left">failure-counter</td> </tr> <tr> <td align="left">schedLastFailure</td> <td align="left">Not Supported</td> </tr> <tr> <td align="left">schedLastFailed</td> <td align="left">last-failed-occurrence</td> </tr> <tr> <td align="left">schedStorageType</td> <td align="left">Not Supported</td> </tr> <tr> <td align="left">schedVariable</td> <td align="left">Not applicable</td> </tr> <tr> <td align="left">schedValue</td> <td align="left">Not applicable</td> </tr> <tr> <td align="left">schedTriggers</td> <td align="left">counter/failure-counter</td> </tr> </tbody> </table> </section> <section anchor="sec-schedule"> <name>The "ietf-schedule" YANG Module</name> <!--[rfced] FYI - As RFC 5545 is also cited within the "ietf-schedule" module, we've added it to the list of RFCs preceding the module. Original: This module imports types defined in [RFC6991] and [RFC7317]. Current: This module imports types defined in [RFC5545], [RFC6991], and [RFC7317]. --> <!--[rfced] FYI - We made the following update to the format in the "ietf-schedule" YANG module using the formatting option of pyang. Original: error-message "Frequency must be provided."; Current: error-message "Frequency must be provided."; --> <t>This module imports types defined in <xreftarget="RFC6991"/>target="RFC5545"/>, <xref target="RFC6991"/>, and <xref target="RFC7317"/>.</t> <sourcecodemarkers="true" name="ietf-schedule@2025-05-30.yang"><![CDATA[type="yang" markers="true"><![CDATA[ file "ietf-schedule@2026-02-18.yang" module ietf-schedule { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-schedule"; prefix schedule; import ietf-yang-types { prefix yang; reference "RFC 6991: Common YANG Data Types"; } import ietf-system { prefix sys; reference "RFC 7317: A YANG Data Model for System Management"; } organization "IETF NETMOD Working Group"; contact "WG Web: <https://datatracker.ietf.org/wg/netmod/> WG List: <mailto:netmod@ietf.org> Editor: Qiufang Ma<mailto:maqiufang1@huawei.com<mailto:maqiufang1@huawei.com> Author: Qin Wu <mailto:bill.wu@huawei.com> Editor: Mohamed Boucadair <mailto:mohamed.boucadair@orange.com> Author: Daniel King <mailto:d.king@lancaster.ac.uk>"; description "This YANG module defines a set of common types and groupingswhichthat are applicable for schedulingpurposespurposes, such as events,policy,policies, services, or resources based on date and time. The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document are to be interpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here. Copyright (c)20252026 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info).All revisions of IETF and IANA published modules can be found at the YANG Parameters registry group (https://www.iana.org/assignments/yang-parameters).This version of this YANG module is part of RFCXXXX;9922; see the RFC itself for full legal notices.The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY',All revisions of IETF and'OPTIONAL' in this document are toIANA-maintained modules can beinterpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appearfound inall capitals, as shown here.";the 'YANG Parameters' registry group (https://www.iana.org/assignments/yang-parameters)."; revision2025-05-302026-02-18 { description "Initial revision."; reference "RFCXXXX:9922: A Common YANG Data Model for Scheduling"; } feature basic-recurrence { description "Indicates that the server supports configuring a basic scheduled recurrence."; } feature icalendar-recurrence { description "Indicates that the server supports configuring a comprehensive scheduled iCalendarrecurrence";recurrence."; reference "RFC 5545: Internet Calendaring and Scheduling Core Object Specification (iCalendar), Sections 3.3.10 and 3.8.5"; } typedef weekday { type enumeration { enum sunday { value 0; description "Sunday of the week."; } enum monday { value 1; description "Monday of the week."; } enum tuesday { value 2; description "Tuesday of the week."; } enum wednesday { value 3; description "Wednesday of the week."; } enum thursday { value 4; description "Thursday of the week."; } enum friday { value 5; description "Friday of the week."; } enum saturday { value 6; description "Saturday of the week."; } } description "Seven days of the week."; } typedef duration { type string { pattern '((\+)?|\-)P((([0-9]+)D)?(T(0[0-9]|1[0-9]|2[0-3])' + ':[0-5][0-9]:[0-5][0-9]))|P([0-9]+)W'; } description "Duration of the time. The format can represent nominal durations (weeks designated by 'W' and days designated by 'D') and accurate durations (hours:minutes:seconds follows the designator 'T'). Note that this value type doesn't support the 'Y' and 'M' designators to specify durations in terms of years and months. Negative durations are typically used to schedule an alarm to trigger before an associated time."; reference "RFC 5545: Internet Calendaring and Scheduling Core Object Specification (iCalendar), Sections 3.3.6 and 3.8.6.3"; } identity schedule-type { description "Base identity for schedule type."; } identity one-shot { base schedule-type; description "Indicates a one-shot schedule. That is a schedule that will trigger an action with the duration being specified as 0 or end time being specified as the same as the start time, and then the schedule will disable itself."; } identity period { base schedule-type; description "Indicates a period-based schedule consisting of either a start and end or a start and positive duration of time. If neither an end nor a duration is indicated, the period is considered to last forever."; } identity recurrence { base schedule-type; description "Indicates a recurrence-based schedule."; } identity frequency-type { description "Base identity for frequency type."; } identity secondly { base frequency-type; description "Indicates a repeating rule based on an interval of a second or more."; } identity minutely { base frequency-type; description "Indicates a repeating rule based on an interval of a minute or more."; } identity hourly { base frequency-type; description "Indicates a repeating rule based on an interval of an hour or more."; } identity daily { base frequency-type; description "Indicates a repeating rule based on an interval of a day or more."; } identity weekly { base frequency-type; description "Indicates a repeating rule based on an interval of a week or more."; } identity monthly { base frequency-type; description "Indicates a repeating rule based on an interval of a month or more."; } identity yearly { base frequency-type; description "Indicates a repeating rule based on an interval of a year or more."; } identity schedule-state { description "Base identity for schedule state."; } identity enabled { base schedule-state; description "Indicates a schedule with an enabled state."; } identity finished { base schedule-state; description "Indicates a schedule with a finished state. The finished state indicates that the schedule has ended."; } identity disabled { base schedule-state; description "Indicates a schedule with a disabled state."; } identity out-of-date { base schedule-state; description "Indicates a schedule that is received out-of-date."; } identity conflicted { base schedule-state; description "Indicates a schedule with a conflicted state with other schedules."; } identity discard-action-type { description "Base identity for the action for the responder to take when a requested schedule cannot be accepted for any reason and is discarded."; } identity warning { base discard-action-type; description "Indicates that a warning message is generated when a schedule is discarded."; } identity error { base discard-action-type; description "Indicates that an error message is generated when a schedule is discarded."; } identity silently-discard { base discard-action-type; description "Indicates that a schedule that is not valid is silently discarded."; } grouping generic-schedule-params { description "Includes a set of generic parameters that are followed by the entity that supports schedules. Such parameters are used as guards to prevent, e.g., stale configuration."; leaf description { type string; description "Provides a description of the schedule."; } leaf time-zone-identifier { type sys:timezone-name; description "Indicates the identifier for the time zone. This parameter MUST be specified if any of the date and time values are in the format of local time. It MUST NOT be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC."; } leaf validity { type yang:date-and-time; description "Specifies the date and time after which a schedule will not be considered as valid. This parameter takes precedence over similar attributes that are provided at the schedule instance itself."; } leaf max-allowed-start { type yang:date-and-time; description "Specifies the maximum scheduled start date and time. A requested schedule whose first instance occurs after this value cannot be accepted by the entity. Specifically, a requested schedule will be rejected if the first occurrence of that schedule exceeds 'max-allowed-start'."; } leaf min-allowed-start { type yang:date-and-time; description "Specifies the minimum scheduled start date and time. A requested schedule whose first instance occurs before this value cannot be accepted by the entity. Specifically, a requested schedule will be rejected if the first occurrence of that schedule is scheduled before 'min-allowed-start'."; } leaf max-allowed-end { type yang:date-and-time; description "A requested schedule will be rejected if the end time of the last occurrence exceeds 'max-allowed-end'."; } leaf discard-action { type identityref { base discard-action-type; } description "Specifies the behavior when a schedule is discarded for any reason, e.g., failing to satisfy the guards in this grouping orit isbeing received out-of-date."; } } grouping period-of-time { description "This grouping is defined for the period of time property."; reference "RFC 5545: Internet Calendaring and Scheduling Core Object Specification (iCalendar), Section 3.3.9"; leaf period-description { type string; description "Provides a description of the period."; } leaf period-start { type yang:date-and-time; description "Period start time."; } leaf time-zone-identifier { type sys:timezone-name; description "Indicates the identifier for the time zone. This parameter MUST be specified if either the 'period-start' or 'period-end' value is reported in local time format. It MUST NOT be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC."; } choice period-type { description "Indicates the type of the time period. Two types are supported. If no choice is indicated, the period is considered to last forever."; case explicit { description "A period of time is identified by its start and its end. 'period-start' indicates the period start."; leaf period-end { type yang:date-and-time; description "A period of time is defined by a start and end time. The start MUST be no later than the end. The period is considered as a one-shot schedule if the end time is the same as the start time."; } } case duration { description "A period of time is defined by a start and a non-negative duration of time."; leaf duration { type duration { pattern 'P((([0-9]+)D)?(T(0[0-9]|1[0-9]|2[0-3])' + ':[0-5][0-9]:[0-5][0-9]))|P([0-9]+)W'; } description "A non-negative duration of time. This value is equivalent to the format ofduration'duration' type except that the value cannot be negative. The period is considered to be a one-shot schedule if the value is 0."; } } } } grouping recurrence-basic { description "A simple definition of recurrence."; leaf recurrence-description { type string; description "Provides a description of the recurrence."; } leaf frequency { type identityref { base frequency-type; } description "Specifies the frequency type of the recurrence rule."; } leaf interval { type uint32 { range "1..max"; } must '../frequency' { error-message "Frequency must be provided."; } description "A positive integer representing the interval at which the recurrence rule repeats. For example, within a 'daily' recurrence rule, a value of '8' means every eight days."; } } grouping recurrence-utc { description "A simple definition of recurrence with time specified in UTC format."; container recurrence-first { description "Specifies the first instance of the recurrence. If unspecified, the recurrence is considered to start from the date and time when the recurrence pattern is first satisfied."; leaf start-time-utc { type yang:date-and-time; description "Defines the date and time of the first instance in the recurrence set. A UTC format MUST be used."; } leaf duration { type uint32; units "seconds"; description "When specified, it indicates how long the first occurrence lasts. Unless specified otherwise, it also applies to all the other instances in the recurrence set."; } } choice recurrence-end { description "Modes to control the end of a recurrence rule. If no choice is indicated, the recurrence rule is considered to repeat forever."; case until { description "This case defines a way that limits the end of a recurrence rule in an inclusive manner."; leaf utc-until { type yang:date-and-time; description "This parameter specifies a date and time value to inclusively terminate the recurrence in UTC format. That is, if the value specified by this parameter is synchronized with the specified recurrence rule, it becomes the last instance of the recurrence rule."; } } case count { description "This case defines the number of occurrences at which to terminate the recurrence rule."; leaf count { type uint32 { range "1..max"; } description "The positive number of occurrences at which to terminate the recurrence rule."; } } } uses recurrence-basic; } grouping recurrence-with-time-zone { description "A simple definition of recurrence to specify a recurrence rule with a time zone."; container recurrence-first { description "Specifies the first instance of the recurrence. If unspecified, the recurrence is considered to start from the date and time when the recurrence pattern is first satisfied."; leaf start-time { type yang:date-and-time; description "Defines the date and time of the first instance in the recurrence set."; } leaf duration { type duration; description "When specified, it indicates how long the first occurrencelast.lasts. Unless specified otherwise, it also applies to all the other instances in the recurrence set."; } } leaf time-zone-identifier { type sys:timezone-name; description "Indicates the identifier for the time zone in a time zone database. This parameter MUST be specified if either the 'start-time' or 'until' value is reported in local time format. It MUST NOT be applied to date and time valueswhichthat are specified in the format of UTC or time zone offset to UTC."; } choice recurrence-end { description "Modes to terminate the recurrence rule. If no choice is indicated, the recurrence rule is considered to repeat forever."; case until { description "The end of the recurrence rule is indicated by a specific date-and-time value in an inclusive manner."; leaf until { type yang:date-and-time; description "Specifies a date and time value to inclusively terminate the recurrence.ThatsThat is, if the value specified by this parameter is synchronized with the specified recurrence, it becomes the last instance of the recurrence."; } } case count { description "The end of the recurrence is indicated by the number of occurrences."; leaf count { type uint32 { range "1..max"; } description "The positive number of occurrences at which to terminate the recurrence."; } } } uses recurrence-basic; } grouping recurrence-utc-with-periods { description "This grouping defines an aggregate set of repeating occurrences with UTC time format. The recurrence instances are specified by the occurrences defined by both the recurrence rule and 'period-timeticks' list. Duplicate instances are ignored."; uses recurrence-utc; list period-timeticks { key "period-start"; description "A list of periods with timeticks formats."; leaf period-start { type yang:timeticks; must "(not(derived-from(../../frequency," + "'schedule:secondly')) or (current() < 100)) and " + "(not(derived-from(../../frequency," + "'schedule:minutely')) or (current() < 6000)) and " + "(not(derived-from(../../frequency,'schedule:hourly'))" + " or (current() < 360000)) and " + "(not(derived-from(../../frequency,'schedule:daily'))" + " or (current() < 8640000)) and " + "(not(derived-from(../../frequency,'schedule:weekly'))" + " or (current() < 60480000)) and " + "(not(derived-from(../../frequency," + "'schedule:monthly')) or (current() < 267840000)) and " + "(not(derived-from(../../frequency,'schedule:yearly'))" + " or (current() < 3162240000))" { error-message "Theperiod-start'period-start' must not exceed the frequency interval."; } description "Start time of the schedule within one recurrence. Given that the value is in timeticks format (i.e., 1/100 of a second), the values in the must statement translateto:to 100 =1s1 s (secondly), 6000 = 60 s = 1 min (minutely), and so on for all instances in the must statement invariant."; } leaf period-end { type yang:timeticks; description "End time of the schedule within one recurrence. The period start MUST be no later than the period end."; } } } grouping recurrence-time-zone-with-periods { description "This grouping defines an aggregate set of repeating occurrences with local time format and time zone specified. The recurrence instances are specified by the occurrences defined by both the recurrence rule and 'period' list. Duplicate instances are ignored."; uses recurrence-with-time-zone; list period { key "period-start"; description "A list of periods with date-and-time formats."; uses period-of-time; } } grouping icalendar-recurrence { description "This grouping specifies properties of a recurrence rule."; reference "RFC 5545: Internet Calendaring and Scheduling Core Object Specification (iCalendar), Section 3.8.5"; uses recurrence-time-zone-with-periods; leaf-list bysecond { type uint32 { range "0..60"; } description "Specifies a list of seconds within a minute."; } leaf-list byminute { type uint32 { range "0..59"; } description "Specifies a list of minutes within an hour."; } leaf-list byhour { type uint32 { range "0..23"; } description "Specifies a list of hours of the day."; } list byday { key "weekday"; description "Specifies a list of days of the week."; leaf-list direction { when "derived-from(../../frequency, 'schedule:monthly') or " + "(derived-from(../../frequency, 'schedule:yearly') " + " and not(../../byyearweek))"; type int32 { range "-53..-1|1..53"; } description "When specified, it indicates the nth occurrence of a specific day within the monthly or yearly recurrence rule. For example, within a monthly rule, +1 monday represents the firstmondayMonday within the month, whereas -1 monday represents the lastmondayMonday of the month."; } leaf weekday { type schedule:weekday; description "Corresponds to seven days of the week."; } } leaf-list bymonthday { type int32 { range "-31..-1|1..31"; } description "Specifies a list of days of the month."; } leaf-list byyearday { type int32 { range "-366..-1|1..366"; } description "Specifies a list of days of the year."; } leaf-list byyearweek { when "derived-from(../frequency, 'schedule:yearly')"; type int32 { range "-53..-1|1..53"; } description "Specifies a list of weeks of the year."; } leaf-list byyearmonth { type uint32 { range "1..12"; } description "Specifies a list of months of the year."; } leaf-list bysetpos { type int32 { range "-366..-1|1..366"; } description "Specifies a list of values that corresponds to the nth occurrence within the set of recurrence instances specified by the rule. It must only be used in conjunction with another 'byxxx' (bysecond, byminute, etc.) rulepart .";part."; } leaf workweek-start { type schedule:weekday; description "Specifies the day on which the workweek starts."; } leaf-list exception-dates { type yang:date-and-time; description "Defines a list of exceptions for recurrence."; } } grouping schedule-status { description "This grouping defines common properties of scheduling status."; leaf state { type identityref { base schedule-state; } description "Indicates the current state of the schedule."; } leaf version { type uint16; description "Indicates the version number of the schedule."; } leaf schedule-type { type identityref { base schedule-type; } description "Indicates the schedule type."; } leaf local-time { type yang:date-and-time; config false; description "Reports the local time as used by the entity that hosts the schedule."; } leaf last-update { type yang:date-and-time; config false; description "Reports the timestampthatof when the schedule is last updated."; } leaf counter { when "derived-from-or-self(../schedule-type, " + "'schedule:recurrence')"; type yang:counter32; config false; description "The number of occurrences while invoking the scheduled action successfully. The count wraps around when it reaches the maximum value."; } leaf last-occurrence { when "derived-from-or-self(../schedule-type, " + "'schedule:recurrence')"; type yang:date-and-time; config false; description "Indicates the timestamp of last occurrence."; } leaf upcoming-occurrence { when "derived-from-or-self(../schedule-type, " + "'schedule:recurrence')" + "and derived-from-or-self(../state, 'schedule:enabled')"; type yang:date-and-time; config false; description "Indicates the timestamp of next occurrence."; } leaf last-failed-occurrence { when "derived-from-or-self(../schedule-type, " + "'schedule:recurrence')"; type yang:date-and-time; config false; description "Indicates the timestamp of last failed action triggered by the schedule."; } leaf failure-counter { when "derived-from-or-self(../schedule-type, " + "'schedule:recurrence')"; type yang:counter32; config false; description "Counts the number of failures while invoking the scheduled action."; } } grouping schedule-status-with-time-zone { description "This grouping defines common properties of scheduling status, includingtimezone";timezone."; leaf time-zone-identifier { type sys:timezone-name; config false; description "Indicates the identifier for the time zone in a time zone database."; } uses schedule-status; } grouping schedule-status-with-name { description "This grouping defines common properties of scheduling status, including a schedule name."; leaf schedule-name { type string; description "The schedule identifier that uniquely identifies a schedule within a device, controller, network, etc. The unicity scope depends on the implementation."; } uses schedule-status; } } ]]></sourcecode> </section> <section anchor="security-considerations"> <name>Security Considerations</name> <t>This sectionusesis modeled after the template described in <xref section="3.7" sectionFormat="of" target="I-D.ietf-netmod-rfc8407bis"/>.</t> <!--[rfced] *AD - Security Considerations Questions a) FYI - We updated the Security Considerations section to match the template at <https://wiki.ietf.org/group/ops/yang-security-guidelines>. Please review and let us know if any further updates are needed. b) As the Writable nodes, Readable nodes, and RFC/action operations sections are not applicable to this document, do the following sentences need to be added accordingly (per the template)? - "There are no particularly sensitive writable data nodes." - "There are no particularly sensitive readable data nodes." - "There are no particularly sensitive RPC or action operations." c) We note that in the paragraph that relates to the "No data nodes" section, there is a sentence missing (i.e., from the template: "For example, reusing some of these groupings will expose privacy-related information (e.g., 'node-example')". Is that omission intentional or should it be added for clarity? From the template: Modules that use the groupings that are defined in this document should identify the corresponding security considerations. For example, reusing some of these groupings will expose privacy-related information (e.g., 'node-example'). Current text in the document: Modules that use the groupings that are defined in this document should identify the corresponding security considerations, for example: --> <t>The "ietf-schedule" YANG modulespecified in this documentdefinesschema fora data model that is designed to be accessed via YANG-based management protocols, such as NETCONF <xref target="RFC6241"/>orand RESTCONF <xref target="RFC8040"/>. These YANG-based management protocols (1) have to use a secure transport layer (e.g., SSH <xref target="RFC4252"/>, TLS <xref target="RFC8446"/>, and QUIC <xref target="RFC9000"/>) and (2) have to use mutual authentication.</t> <t>The Network Configuration Access Control Model (NACM) <xref target="RFC8341"/> provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content.</t> <t>The "ietf-schedule" module defines a set oftypesidentities, types, and groupings. These nodes are intended to be reused by other YANG modules. The module by itself does not expose any data nodes that are writable, data nodes that contain read-only state, or RPCs. As such, there are no additional security issues related to the "ietf-schedule" module that need to be considered.</t> <t>Modules that use the groupings that are defined in this document should identify the corresponding security considerations,e.g.,:</t>for example:</t> <ul spacing="normal"> <li> <t>Scheduling depends on reliable and accurate time synchronization. Inaccurate date and time setting can lead to scheduling events being triggered at incorrect intervals, potentially causing system failures or security vulnerabilities.</t> </li> <li> <t>Recurring events may conceal abnormal behavior or security threats, which may be drowned out by normal events, especially when they are triggered frequently.</t> </li> <li> <t>The absence of detailed logs and audit records of each occurrence trigger time and actionresults,results andso on,therefore may make security incidents difficult to trace.</t> </li> <li> <t>Care must be taken when defining recurrences occurring very often and frequent that can be an additional source of attacks by keeping the system permanently busy with the management of scheduling.</t> </li> </ul> </section> <section anchor="iana-considerations"> <name>IANA Considerations</name> <section anchor="the-ietf-xml-registry"> <name>The"IETF XML"IETF XML Registry</name> <t>This documentregistershas registered the following URI in the "IETF XML Registry" <xref target="RFC3688"/>.</t><artwork><![CDATA[ URI: urn:ietf:params:xml:ns:yang:ietf-schedule Registrant Contact: The IESG. XML: N/A,<dl> <dt>URI:</dt> <dd> <t>urn:ietf:params:xml:ns:yang:ietf-schedule</t> </dd> <dt>Registrant Contact:</dt> <dd> <t>The IESG.</t> </dd> <dt>XML:</dt> <dd> <t>N/A; the requested URI is an XMLnamespace. ]]></artwork>namespace.</t> </dd> </dl> </section> <section anchor="the-yang-module-names-registry"> <name>The"YANGYANG ModuleNames"Names Registry</name> <t>This documentregistershas registered the following YANG module in the "YANG Module Names" registry <xref target="RFC6020"/>.</t><artwork><![CDATA[ name: ietf-schedule namespace: urn:ietf:params:xml:ns:yang:ietf-schedule prefix: schedule maintained by IANA? N reference: RFC XXXX ]]></artwork><dl> <dt>Name:</dt> <dd> <t>ietf-schedule</t> </dd> <dt>Maintained by IANA:</dt> <dd> <t>N</t> </dd> <dt>Namespace:</dt> <dd> <t>urn:ietf:params:xml:ns:yang:ietf-schedule</t> </dd> <dt>Prefix:</dt> <dd> <t>schedule</t> </dd> <dt>Reference:</dt> <dd> <t>RFC 9922</t> </dd> </dl> </section> </section> </middle> <back> <displayreference target="I-D.ietf-netmod-eca-policy" to="NETMOD-ECA-POLICY"/> <displayreference target="I-D.ietf-netmod-rfc8407bis" to="YANG-GUIDE"/> <displayreference target="I-D.ietf-ntp-ntpv5" to="NTPv5"/> <displayreference target="I-D.ietf-opsawg-scheduling-oam-tests" to="YANG-OAM"/> <displayreference target="I-D.ietf-opsawg-ucl-acl" to="YANG-NAC"/> <displayreference target="I-D.ietf-tvr-schedule-yang" to="YANG-SCHEDULE"/> <displayreference target="I-D.liu-netmod-yang-schedule" to="YANG-CONFIG-SCHEDULE"/> <references anchor="sec-combined-references"> <name>References</name> <references anchor="sec-normative-references"> <name>Normative References</name> <referenceanchor="RFC3231">anchor="W3C.XML1.0" target="https://www.w3.org/TR/2008/REC-xml-20081126/"> <front><title>Definitions of Managed Objects for Scheduling Management Operations</title> <author fullname="D. Levi" initials="D." surname="Levi"/> <author fullname="J. Schoenwaelder" initials="J." surname="Schoenwaelder"/> <date month="January" year="2002"/> <abstract> <t>This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes a set of managed objects that are used to schedule management operations periodically or at specified dates and times. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="3231"/> <seriesInfo name="DOI" value="10.17487/RFC3231"/> </reference> <reference anchor="RFC2119"> <front> <title>Key words for use in RFCs to Indicate Requirement Levels</title> <author fullname="S. Bradner" initials="S." surname="Bradner"/> <date month="March" year="1997"/> <abstract> <t>In many standards track documents several words are used to signify the requirements in the specification. These words are often capitalized. This document defines these words as they should be interpreted in IETF documents. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.</t> </abstract> </front> <seriesInfo name="BCP" value="14"/> <seriesInfo name="RFC" value="2119"/> <seriesInfo name="DOI" value="10.17487/RFC2119"/> </reference> <reference anchor="RFC8174"> <front> <title>Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words</title> <author fullname="B. Leiba" initials="B." surname="Leiba"/> <date month="May" year="2017"/> <abstract> <t>RFC 2119 specifies common key words that may be used in protocol specifications. This document aims to reduce the ambiguity by clarifying that only UPPERCASE usage of the key words have the defined special meanings.</t> </abstract> </front> <seriesInfo name="BCP" value="14"/> <seriesInfo name="RFC" value="8174"/> <seriesInfo name="DOI" value="10.17487/RFC8174"/> </reference> <reference anchor="RFC7950"> <front> <title>The YANG 1.1 Data Modeling Language</title> <author fullname="M. Bjorklund" initials="M." role="editor" surname="Bjorklund"/> <date month="August" year="2016"/> <abstract> <t>YANG is a data modeling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols. This document describes the syntax and semantics of version 1.1 of the YANG language. YANG version 1.1 is a maintenance release of the YANG language, addressing ambiguities and defects in the original specification. There are a small number of backward incompatibilities from YANG version 1. This document also specifies the YANG mappings to the Network Configuration Protocol (NETCONF).</t> </abstract> </front> <seriesInfo name="RFC" value="7950"/> <seriesInfo name="DOI" value="10.17487/RFC7950"/> </reference> <reference anchor="RFC5545"> <front> <title>Internet Calendaring and Scheduling Core Object Specification (iCalendar)</title> <author fullname="B. Desruisseaux" initials="B." role="editor" surname="Desruisseaux"/> <date month="September" year="2009"/> <abstract> <t>This document defines the iCalendar data format for representing and exchanging calendaring and scheduling information such as events, to-dos, journal entries, and free/busy information, independent of any particular calendar service or protocol. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="5545"/> <seriesInfo name="DOI" value="10.17487/RFC5545"/> </reference> <reference anchor="RFC7317"> <front> <title>A YANG Data Model for System Management</title> <author fullname="A. Bierman" initials="A." surname="Bierman"/> <author fullname="M. Bjorklund" initials="M." surname="Bjorklund"/> <date month="August" year="2014"/> <abstract> <t>This document defines a YANG data model for the configuration and identification of some common system properties within a device containing a Network Configuration Protocol (NETCONF) server. This document also includes data node definitions for system identification, time-of-day management, user management, DNS resolver configuration, and some protocol operations for system management.</t> </abstract> </front> <seriesInfo name="RFC" value="7317"/> <seriesInfo name="DOI" value="10.17487/RFC7317"/> </reference> <reference anchor="RFC6991"> <front> <title>Common YANG Data Types</title> <author fullname="J. Schoenwaelder" initials="J." role="editor" surname="Schoenwaelder"/> <date month="July" year="2013"/> <abstract> <t>This document introduces a collection of common data types to be used with the YANG data modeling language. This document obsoletes RFC 6021.</t> </abstract> </front> <seriesInfo name="RFC" value="6991"/> <seriesInfo name="DOI" value="10.17487/RFC6991"/> </reference> <reference anchor="RFC8341"> <front> <title>Network Configuration Access Control Model</title> <author fullname="A. Bierman" initials="A." surname="Bierman"/> <author fullname="M. Bjorklund" initials="M." surname="Bjorklund"/> <date month="March" year="2018"/> <abstract> <t>The standardization of network configuration interfaces for use with the Network Configuration Protocol (NETCONF) or the RESTCONF protocol requires a structured and secure operating environment that promotes human usability and multi-vendor interoperability. There is a need for standard mechanisms to restrict NETCONF or RESTCONF protocol access for particular users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. This document defines such an access control model.</t> <t>This document obsoletes RFC 6536.</t> </abstract> </front> <seriesInfo name="STD" value="91"/> <seriesInfo name="RFC" value="8341"/> <seriesInfo name="DOI" value="10.17487/RFC8341"/> </reference> <reference anchor="RFC3688"> <front> <title>The IETF XML Registry</title> <author fullname="M. Mealling" initials="M." surname="Mealling"/> <date month="January" year="2004"/> <abstract> <t>This document describes an IANA maintained registry for IETF standards which use Extensible<title>Extensible Markup Language (XML)related items such as Namespaces, Document Type Declarations (DTDs), Schemas, and Resource Description Framework (RDF) Schemas.</t> </abstract> </front> <seriesInfo name="BCP" value="81"/> <seriesInfo name="RFC" value="3688"/> <seriesInfo name="DOI" value="10.17487/RFC3688"/> </reference> <reference anchor="RFC6020"> <front> <title>YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)</title> <author fullname="M. Bjorklund" initials="M." role="editor" surname="Bjorklund"/> <date month="October" year="2010"/> <abstract> <t>YANG is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="6020"/> <seriesInfo name="DOI" value="10.17487/RFC6020"/> </reference> </references> <references anchor="sec-informative-references"> <name>Informative References</name> <reference anchor="I-D.ietf-opsawg-ucl-acl"> <front> <title>A YANG Data Model and RADIUS Extension for Policy-based Network Access Control</title>1.0 (Fifth Edition)</title> <authorfullname="Qiufang Ma" initials="Q." surname="Ma"> <organization>Huawei</organization> </author> <author fullname="Qin Wu" initials="Q." surname="Wu"> <organization>Huawei</organization> </author> <author fullname="Mohamed Boucadair" initials="M." surname="Boucadair"> <organization>Orange</organization>initials="T." surname="Bray" fullname="Tim Bray" role="editor"> <organization/> </author> <authorfullname="Daniel King" initials="D." surname="King"> <organization>Lancaster University</organization>initials="J." surname="Paoli" fullname="Jean Paoli" role="editor"> <organization/> </author><date day="20" month="March" year="2025"/> <abstract> <t> This document defines a YANG data model for policy-based network access control, which provides consistent and efficient enforcement of network access control policies based on group identity. Moreover, this document defines a mechanism to ease the maintenance of the mapping between a user group identifier and a set of IP/MAC addresses to enforce policy-based network access control. In addition, the document defines a Remote Authentication Dial-in User Service (RADIUS) attribute that is used to communicate the user group identifier as part of identification and authorization information. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-opsawg-ucl-acl-07"/> </reference> <reference anchor="I-D.ietf-opsawg-scheduling-oam-tests"> <front> <title>A YANG Data Model for Network Diagnosis using Scheduled Sequences of OAM Tests</title><authorfullname="Luis M. Contreras" initials="L.initials="C. M."surname="Contreras"> <organization>Telefonica</organization> </author> <author fullname="Victor Lopez" initials="V." surname="Lopez"> <organization>Nokia</organization> </author> <date day="7" month="July" year="2025"/> <abstract> <t> This document defines a YANG data model for network diagnosis on- demand relying upon Operations, Administration, and Maintenance (OAM) tests. This document defines both 'oam-unitary-test' and 'oam-test- sequence' YANG modules to manage the lifecycle of network diagnosis procedures, primarily intended for use by an SDN controller or network orchestrator, rather than by individual network nodes. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-opsawg-scheduling-oam-tests-01"/> </reference> <reference anchor="I-D.ietf-tvr-schedule-yang"> <front> <title>YANG Data Model for Scheduled Attributes</title> <author fullname="Yingzhen Qu" initials="Y." surname="Qu"> <organization>Futurewei Technologies</organization> </author> <author fullname="Acee Lindem" initials="A." surname="Lindem"> <organization>Arrcus, Inc.</organization> </author> <author fullname="Eric Kinzie" initials="E." surname="Kinzie"> <organization>LabN Consulting, L.L.C.</organization> </author> <author fullname="Don Fedyk" initials="D." surname="Fedyk"> <organization>LabN Consulting, L.L.C.</organization> </author> <author fullname="Marc Blanchet" initials="M." surname="Blanchet"> <organization>Viagenie</organization> </author> <date day="4" month="July" year="2025"/> <abstract> <t> The YANG model in this document includes three modules, and can be used to manage network resources and topologies with scheduled attributes, such as predictable link loss and link connectivity as a function of time. The intent is to have this information be utilized by Time-Variant Routing systems. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-tvr-schedule-yang-05"/> </reference> <reference anchor="RFC8413"> <front> <title>Framework for Scheduled Use of Resources</title> <author fullname="Y. Zhuang" initials="Y." surname="Zhuang"/> <author fullname="Q. Wu" initials="Q." surname="Wu"/> <author fullname="H. Chen" initials="H." surname="Chen"/> <author fullname="A. Farrel" initials="A." surname="Farrel"/> <date month="July" year="2018"/> <abstract> <t>Time-Scheduled (TS) reservation of Traffic Engineering (TE) resources can be used to provide resource booking for TE Label Switched Paths so as to better guarantee services for customers and to improve the efficiency of network resource usage at any moment in time, including network usage that is planned for the future. This document provides a framework that describes and discusses the architecture for supporting scheduled reservation of TE resources. This document does not describe specific protocols or protocol extensions needed to realize this service.</t> </abstract> </front> <seriesInfo name="RFC" value="8413"/> <seriesInfo name="DOI" value="10.17487/RFC8413"/> </reference> <reference anchor="RFC8340"> <front> <title>YANG Tree Diagrams</title> <author fullname="M. Bjorklund" initials="M." surname="Bjorklund"/> <author fullname="L. Berger" initials="L." role="editor" surname="Berger"/> <date month="March" year="2018"/> <abstract> <t>This document captures the current syntax used in YANG module tree diagrams. The purpose of this document is to provide a single location for this definition. This syntax may be updated from time to time based on the evolution of the YANG language.</t> </abstract> </front> <seriesInfo name="BCP" value="215"/> <seriesInfo name="RFC" value="8340"/> <seriesInfo name="DOI" value="10.17487/RFC8340"/> </reference> <reference anchor="I-D.ietf-netmod-rfc8407bis"> <front> <title>Guidelines for Authors and Reviewers of Documents Containing YANG Data Models</title> <author fullname="Andy Bierman" initials="A." surname="Bierman"> <organization>YumaWorks</organization> </author> <author fullname="Mohamed Boucadair" initials="M." surname="Boucadair"> <organization>Orange</organization> </author> <author fullname="Qin Wu" initials="Q." surname="Wu"> <organization>Huawei</organization> </author> <date day="5" month="June" year="2025"/> <abstract> <t> This document provides guidelines for authors and reviewers of specifications containing YANG data models, including IANA-maintained modules. Recommendations and procedures are defined, which are intended to increase interoperability and usability of Network Configuration Protocol (NETCONF) and RESTCONF Protocol implementations that utilize YANG modules. This document obsoletes RFC 8407. Also, this document updates RFC 8126 by providing additional guidelines for writing the IANA considerations for RFCs that specify IANA-maintained modules. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-netmod-rfc8407bis-28"/> </reference> <reference anchor="RFC3339"> <front> <title>Date and Time on the Internet: Timestamps</title> <author fullname="G. Klyne" initials="G." surname="Klyne"/> <authorsurname="Sperberg-McQueen" fullname="C.Newman" initials="C." surname="Newman"/> <date month="July" year="2002"/> <abstract> <t>This document defines a date and time format for use in Internet protocols that is a profile of the ISO 8601 standard for representation of dates and times using the Gregorian calendar.</t> </abstract> </front> <seriesInfo name="RFC" value="3339"/> <seriesInfo name="DOI" value="10.17487/RFC3339"/> </reference> <reference anchor="I-D.ietf-ntp-ntpv5"> <front> <title>Network Time Protocol Version 5</title> <author fullname="Miroslav Lichvar" initials="M." surname="Lichvar"> <organization>Red Hat</organization>M. Sperberg-McQueen" role="editor"> <organization/> </author> <authorfullname="Tal Mizrahi" initials="T." surname="Mizrahi"> <organization>Huawei</organization> </author> <date day="2" month="July" year="2025"/> <abstract> <t> The Network Time Protocol (NTP) is a widely deployed protocol that allows hosts to obtain the current time of day from time servers. This document specifies version 5 of the protocol (NTPv5), which adopts a client-server model as its sole mode of operation. Legacy operational modes supported in earlier versions have been removed to improve protocol robustness and clarity. While this specification defines the protocol used for time distribution, it does not define the algorithms or heuristics employed by clients to determine or adjust their local time. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-ntp-ntpv5-05"/> </reference> <reference anchor="RFC6241"> <front> <title>Network Configuration Protocol (NETCONF)</title> <author fullname="R. Enns" initials="R." role="editor" surname="Enns"/> <author fullname="M. Bjorklund" initials="M." role="editor" surname="Bjorklund"/> <author fullname="J. Schoenwaelder" initials="J." role="editor" surname="Schoenwaelder"/> <author fullname="A. Bierman" initials="A." role="editor" surname="Bierman"/> <date month="June" year="2011"/> <abstract> <t>The Network Configuration Protocol (NETCONF) defined in this document provides mechanisms to install, manipulate, and delete the configuration of network devices. It uses an Extensible Markup Language (XML)-based data encoding for the configuration data as well as the protocol messages. The NETCONF protocol operations are realized as remote procedure calls (RPCs). This document obsoletes RFC 4741. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="6241"/> <seriesInfo name="DOI" value="10.17487/RFC6241"/> </reference> <reference anchor="RFC8040"> <front> <title>RESTCONF Protocol</title> <author fullname="A. Bierman" initials="A." surname="Bierman"/> <author fullname="M. Bjorklund" initials="M." surname="Bjorklund"/> <author fullname="K. Watsen" initials="K." surname="Watsen"/> <date month="January" year="2017"/> <abstract> <t>This document describes an HTTP-based protocol that provides a programmatic interface for accessing data defined in YANG, using the datastore concepts defined in the Network Configuration Protocol (NETCONF).</t> </abstract> </front> <seriesInfo name="RFC" value="8040"/> <seriesInfo name="DOI" value="10.17487/RFC8040"/> </reference> <reference anchor="RFC4252"> <front> <title>The Secure Shell (SSH) Authentication Protocol</title> <author fullname="T. Ylonen" initials="T." surname="Ylonen"/> <author fullname="C. Lonvick" initials="C." role="editor" surname="Lonvick"/> <date month="January" year="2006"/> <abstract> <t>The Secure Shell Protocol (SSH) is a protocol for secure remote login and other secure network services over an insecure network. This document describes the SSH authentication protocol framework and public key, password, and host-based client authentication methods. Additional authentication methods are described in separate documents. The SSH authentication protocol runs on top of the SSH transport layer protocol and provides a single authenticated tunnel for the SSH connection protocol. [STANDARDS-TRACK]</t> </abstract> </front> <seriesInfo name="RFC" value="4252"/> <seriesInfo name="DOI" value="10.17487/RFC4252"/> </reference> <reference anchor="RFC8446"> <front> <title>The Transport Layer Security (TLS) Protocol Version 1.3</title> <author fullname="E. Rescorla"initials="E."surname="Rescorla"/> <date month="August" year="2018"/> <abstract> <t>This document specifies version 1.3 of the Transport Layer Security (TLS) protocol. TLS allows client/server applications to communicate over the Internet in a way that is designed to prevent eavesdropping, tampering, and message forgery.</t> <t>This document updates RFCs 5705 and 6066, and obsoletes RFCs 5077, 5246, and 6961. This document also specifies new requirements for TLS 1.2 implementations.</t> </abstract> </front> <seriesInfo name="RFC" value="8446"/> <seriesInfo name="DOI" value="10.17487/RFC8446"/> </reference> <reference anchor="RFC9000"> <front> <title>QUIC: A UDP-Based Multiplexed and Secure Transport</title> <author fullname="J. Iyengar" initials="J." role="editor" surname="Iyengar"/> <author fullname="M. Thomson" initials="M." role="editor" surname="Thomson"/> <date month="May" year="2021"/> <abstract> <t>This document defines the core of the QUIC transport protocol. QUIC provides applications with flow-controlled streams for structured communication, low-latency connection establishment, and network path migration. QUIC includes security measures that ensure confidentiality, integrity, and availability in a range of deployment circumstances. Accompanying documents describe the integration of TLS for key negotiation, loss detection, and an exemplary congestion control algorithm.</t> </abstract> </front> <seriesInfo name="RFC" value="9000"/> <seriesInfo name="DOI" value="10.17487/RFC9000"/> </reference> <reference anchor="RFC7951"> <front> <title>JSON Encoding of Data Modeled with YANG</title> <author fullname="L. Lhotka" initials="L." surname="Lhotka"/> <date month="August" year="2016"/> <abstract> <t>This document defines encoding rules for representing configuration data, state data, parameters of Remote Procedure Call (RPC) operations or actions, and notifications defined using YANG as JavaScript Object Notation (JSON) text.</t> </abstract> </front> <seriesInfo name="RFC" value="7951"/> <seriesInfo name="DOI" value="10.17487/RFC7951"/> </reference> <reference anchor="RFC9657"> <front> <title>Time-Variant Routing (TVR) Use Cases</title> <author fullname="E. Birrane, III" initials="E." surname="Birrane, III"/> <author fullname="N. Kuhn" initials="N." surname="Kuhn"/> <author fullname="Y. Qu" initials="Y." surname="Qu"/> <author fullname="R. Taylor" initials="R." surname="Taylor"/> <author fullname="L. Zhang" initials="L." surname="Zhang"/> <date month="October" year="2024"/> <abstract> <t>This document introduces use cases where Time-Variant Routing (TVR) computations (i.e., routing computations that take into consideration time-based or scheduled changes to a network) could improve routing protocol convergence and/or network performance.</t> </abstract> </front> <seriesInfo name="RFC" value="9657"/> <seriesInfo name="DOI" value="10.17487/RFC9657"/> </reference> <reference anchor="I-D.ietf-netmod-eca-policy"> <front> <title>A YANG Data model for ECA Policy Management</title> <author fullname="Qin Wu" initials="Q." surname="Wu"> <organization>Huawei</organization> </author> <author fullname="Igor Bryskin" initials="I." surname="Bryskin"> <organization>Individual</organization> </author> <author fullname="Henk Birkholz" initials="H." surname="Birkholz"> <organization>Fraunhofer SIT</organization> </author> <author fullname="Xufeng Liu" initials="X." surname="Liu"> <organization>Volta Networks</organization> </author> <author fullname="Benoît Claise" initials="B." surname="Claise"> <organization>Cisco</organization> </author> <date day="19" month="February" year="2021"/> <abstract> <t> This document defines a YANG data model for Event Condition Action (ECA) policy management. The ECA policy YANG module provides the ability to delegate some network management functions to the server (e.g., a NETCONF or RESTCONF server) which can take simple and instant action when a trigger condition on the managed objects is met. </t> </abstract> </front> <seriesInfo name="Internet-Draft" value="draft-ietf-netmod-eca-policy-01"/> </reference> <reference anchor="I-D.liu-netmod-yang-schedule"> <front> <title>A YANG Data Model for Configuration Scheduling</title> <author fullname="Xufeng Liu" initials="X." surname="Liu"> <organization>Jabil</organization> </author> <author fullname="Igor Bryskin" initials="I." surname="Bryskin"> <organization>Huawei Technologies</organization> </author> <author fullname="Vishnu Pavan Beeram" initials="V. P." surname="Beeram"> <organization>Juniper Networks</organization> </author> <author fullname="Tarek Saad" initials="T." surname="Saad"> <organization>Cisco Systems Inc</organization> </author> <author fullname="Himanshu Shah" initials="H." surname="Shah"> <organization>Ciena</organization>surname="Maler" fullname="Eve Maler" role="editor"> <organization/> </author> <authorfullname="Oscar Gonzalez de Dios" initials="O. G." surname="de Dios"> <organization>Telefonica</organization>initials="F." surname="Yergeau" fullname="Francois Yergeau" role="editor"> <organization/> </author> <dateday="1" month="March" year="2018"/> <abstract> <t> This document describes a data model for configuration scheduling. </t> </abstract>year="2008" month="November" day="26"/> </front><seriesInfo name="Internet-Draft" value="draft-liu-netmod-yang-schedule-05"/><refcontent>W3C Recommendation</refcontent> </reference> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3231.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.2119.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8174.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7950.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.5545.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7317.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6991.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8341.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3688.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6020.xml"/> </references> <references anchor="sec-informative-references"> <name>Informative References</name> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-netmod-eca-policy.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-netmod-rfc8407bis.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-ntp-ntpv5.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-opsawg-scheduling-oam-tests.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-opsawg-ucl-acl.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.ietf-tvr-schedule-yang.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml3/reference.I-D.liu-netmod-yang-schedule.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8413.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8340.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.3339.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.6241.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8040.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.4252.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.8446.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9000.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.7951.xml"/> <xi:include href="https://bib.ietf.org/public/rfc/bibxml/reference.RFC.9657.xml"/> </references> </references> <?line1637?>1834?> <section anchor="usage"> <name>Examples of Scheduling Format Representation</name> <t>This section provides some examples to illustrate the use of the period and recurrence formats defined in <xref target="sec-schedule"/>. The following modules are used for illustration purposes and make examples verifiable:</t><artwork><![CDATA[<!--[rfced] In Appendix A, should each example be listed in separate sourcecode blocks? They are all currently contained within one block of sourcecode. --> <!-- [rfced] FYI, the YANG examples (example-sch-usage-1 - 8.yang and example-scheduled-backup.yang, example-scheduled-link-bandwidth.yang, and example-sch-capacity-res.yang) each give errors and warnings from pyang -ietf. Please confirm this is as expected. --> <sourcecode type="yang"><![CDATA[ module example-sch-usage-1 { yang-version 1.1; namespace "http://example.com/example-sch-usage-1"; prefix "ex-schu-1"; import ietf-schedule { prefix "schedule"; } container generic-schedule-params { uses schedule:generic-schedule-params; } container schedule-status { uses schedule:schedule-status; } } module example-sch-usage-2 { yang-version 1.1; namespace "http://example.com/example-sch-usage-2"; prefix "ex-schu2"; import ietf-schedule { prefix "schedule"; } container period-of-time { uses schedule:period-of-time; } } module example-sch-usage-3 { yang-version 1.1; namespace "http://example.com/example-sch-usage-3"; prefix "ex-schu-3"; import ietf-schedule { prefix "schedule"; } container recurrence-basic { uses schedule:recurrence-basic { refine frequency { mandatory true; } refine interval { default 1; } } } } module example-sch-usage-4 { yang-version 1.1; namespace "http://example.com/example-sch-usage-4"; prefix "ex-schu-4"; import ietf-schedule { prefix "schedule"; } container recurrence-utc { uses schedule:recurrence-utc; } } module example-sch-usage-5 { yang-version 1.1; namespace "http://example.com/example-sch-usage-5"; prefix "ex-schu-5"; import ietf-schedule { prefix "schedule"; } container recurrence-with-time-zone { uses schedule:recurrence-with-time-zone; } } module example-sch-usage-6 { yang-version 1.1; namespace "http://example.com/example-sch-usage-6"; prefix "ex-schu-6"; import ietf-schedule { prefix "schedule"; } container recurrence-utc-with-date-times { uses schedule:recurrence-utc-with-periods; } } module example-sch-usage-7 { yang-version 1.1; namespace "http://example.com/example-sch-usage-7"; prefix "ex-schu-8"; import ietf-schedule { prefix "schedule"; container recurrence-time-zone-with-date-times { uses schedule:recurrence-time-zone-with-periods; } } module example-sch-usage-8 { yang-version 1.1; namespace "http://example.com/example-sch-usage-8"; prefix "ex-schu-8"; container icalendar-recurrence { uses schedule:icalendar-recurrence { refine workweek-start { default monday; } } } }]]></artwork>]]></sourcecode> <t>For each example, only the message body is provided withJSONJSON, which is used for encoding per the guidance in <xref target="RFC7951"/>.</t> <section anchor="the-generic-schedule-params-grouping"> <name>The "generic-schedule-params" Grouping</name> <t><xref target="ex-0"/> illustrates the example of a requested schedule that needs to start no earlier than 08:00 AM, January 1, 2025 and end no later than 8:00 PM, January 31, 2025 (Beijing time). Schedule requests that fail to meet the requirements are ignored by thesystemsystem, as indicated by "discard-action".</t> <figure anchor="ex-0"> <name>Generic Parameters with 'max-allowed-end' for Schedule Validation</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-1:generic-schedule-params": { "time-zone-identifier": "China/Beijing", "min-allowed-start": "2025-01-01T08:00:00", "max-allowed-end": "2025-01-31T20:00:00", "discard-action": "ietf-schedule:silently-discard" } }]]></artwork>]]></sourcecode> </figure> <t>To illustrate the difference between "max-allowed-end" and "validity" parameters, <xref target="ex-00"/> shows the example of a requested schedule that needs to start no earlier than 08:00 AM, January 1, 2025 (Beijing time). Schedule requests that fail to meet the requirements are ignored by thesystemsystem, as indicated by "discard-action". The requested schedule may end after 8:00 PM, January 31, 2025, but any occurrences that are generated after that time would not be considered as valid.</t> <figure anchor="ex-00"> <name>Generic Parameters with 'validity' for Schedule Validation</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-1:generic-schedule-params": { "time-zone-identifier": "China/Beijing", "validity": "2025-01-31T20:00:00", "min-allowed-start": "2025-01-01T08:00:00", "discard-action": "ietf-schedule:silently-discard" } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-period-of-time-grouping"> <name>The "period-of-time" Grouping</name> <t><xref target="ex-1"/> shows an example of a period that starts at 08:00:00UTC,UTC on January 1, 2025 and ends at 18:00:00 UTC on December 31, 2027.</t> <figure anchor="ex-1"> <name>Simple Start/End Schedule</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-2:period-of-time": { "period-start": "2025-01-01T08:00:00Z", "period-end": "2027-12-31T18:00:00Z" } }]]></artwork>]]></sourcecode> </figure> <t>An example of a period that starts at 08:00:00UTC,UTC on January 1, 2025 and lasts 15 days and 5 hours and 20 minutes is encoded as shown in <xref target="ex-2"/>.</t> <figure anchor="ex-2"> <name>Simple Schedule with Duration</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-2:period-of-time": { "period-start": "2025-01-01T08:00:00Z", "duration": "P15DT05:20:00" } }]]></artwork>]]></sourcecode> </figure> <t>An example of a period that starts at 2:00A.M.AM in Los Angeles on November 19, 2025 and lasts 20 weeks is depicted in <xref target="ex-3"/>.</t> <figure anchor="ex-3"> <name>Simple Schedule with Time Zone Indication</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-2:period-of-time": { "period-start": "2025-11-19T02:00:00", "time-zone-identifier": "America/Los_Angeles", "duration": "P20W" } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-recurrence-basic-grouping"> <name>The "recurrence-basic" Grouping</name> <t><xreftarget="ex-6"/>target="ex-4"/> indicates a recurrence of every 2daysdays, which starts immediately and repeats forever:</t> <figure anchor="ex-4"> <name>Simple Schedule with Recurrence</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-3:recurrence-basic": { "recurrence-description": "forever recurrence rule", "frequency": "ietf-schedule:daily", "interval": 2 } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-recurrence-utc-grouping"> <name>The "recurrence-utc" Grouping</name> <t><xref target="ex-5"/> indicates a recurrence from 8:00 AM to 9:00 AM every day, from December 1 to December 31, 2025 in UTC:</t> <figure anchor="ex-5"> <name>Simple Schedule with Recurrence in UTC</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-4:recurrence-utc": { "recurrence-first": { "start-time-utc": "2025-12-01T08:00:00Z", "duration": 3600 }, "frequency": "ietf-schedule:daily", "interval": 1, "utc-until": "2025-12-31T23:59:59Z" } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-recurrence-with-time-zone-grouping"> <name>The "recurrence-with-time-zone" Grouping</name> <t><xref target="ex-6"/> indicates a recurrence of every 2 hours for 10occurrences, lastingoccurrences that lasts 10minutes,minutes andstartingstarts at 3p.m.PM on December 1, 2025 in New York:</t> <figure anchor="ex-6"> <name>Simple Schedule with Recurrence with Time Zone Indication</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-5:recurrence-with-time-zone": { "recurrence-first": { "start-time": "2025-12-01T15:00:00", "duration": "PT00:10:00", "time-zone-identifier": "America/New_York" }, "frequency": "ietf-schedule:hourly", "interval": 2, "count": 10 } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-recurrence-utc-with-periods-grouping"> <name>The "recurrence-utc-with-periods" Grouping</name> <t><xref target="ex-7"/> indicates a recurrence that occurs every two days starting at 9:00 AM and 3:00 PM for a duration of 30 minutes and 40minutesminutes, respectively, from 2025-06-01 to 2025-06-30 in UTC:</t> <!--[rfced] We note that dates are formatted in different ways in Appendix A. For example, "January 31, 2025" and "2025-06-01" are used in Appendices A.1 and A.6, respectively. If these instances should be consistent, please let us know which form you prefer. Original: Figure 10 illustrates the example of a requested schedule that needs to start no earlier than 08:00 AM, January 1, 2025 and end no later than 8:00 PM, January 31, 2025 (Beijing time). ... Figure 18 indicates a recurrence that occurs every two days starting at 9:00 AM and 3:00 PM for a duration of 30 minutes and 40 minutes respectively, from 2025-06-01 to 2025-06-30 in UTC: --> <figure anchor="ex-7"> <name>Example of Recurrence With Date Times</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-6:recurrence-utc-with-periods": { "recurrence-first": { "start-time-utc": "2025-06-01T09:00:00Z" }, "frequency": "ietf-schedule:daily", "interval": 2, "utc-until": "2025-06-30T23:59:59Z", "period-timeticks": [ { "period-start": "3240000", "period-end": "3420000" }, { "period-start": "5400000", "period-end": "5640000" } ] } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-recurrence-time-zone-with-periods-grouping"> <name>The "recurrence-time-zone-with-periods" Grouping</name> <t><xref target="ex-8"/> indicates a recurrence that occurs every 30 minutes and lasts for 15 minutes from 9:00 AM to 5:00 PM andan extratwo extra occurrences at 6:00 PM and 6:30 PM with each lasting for 20 minutes on 2025-12-01 (New York):</t> <figure anchor="ex-8"> <name>Example of Advanced Recurrence Schedule</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-7:recurrence-time-zone-with-periods": { "recurrence-first": { "start-time": "2025-12-01T09:00:00", "duration": "PT00:15:00", "time-zone-identifier": "America/New_York" }, "frequency": "ietf-schedule:minutely", "interval": 30, "until": "2025-12-01T17:00:00Z", "period": [ { "period-start": "2025-12-01T18:00:00", "duration": "PT00:20:00" }, { "period-start": "2025-12-01T18:30:00", "duration": "PT00:20:00" } ] } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-icalendar-recurrence-grouping"> <name>The "icalendar-recurrence" Grouping</name> <t><xref target="ex-9"/> indicates 10 occurrencesthat occurat 8:00 AM(EST),(EST) every last Saturday of the month starting in January 2024:</t> <figure anchor="ex-9"> <name>Simple iCalendar Recurrence</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-8:icalendar-recurrence": { "recurrence-first": { "start-time": "2024-01-27T08:00:00", "time-zone-identifier": "America/New_York" }, "frequency": "ietf-schedule:monthly", "count": 10, "byday": [ { "direction": [ -1 ], "weekday": "saturday" } ] } }]]></artwork>]]></sourcecode> </figure> <t><xref target="ex-10"/> is an example of a recurrence that occurs on the last workday of the month until December 25, 2025,fromstarting January 1, 2025:</t> <figure anchor="ex-10"> <name>Example of Advanced iCalendar Recurrence</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-8:icalendar-recurrence": { "recurrence-first": { "start-time": "2025-01-01" }, "frequency": "ietf-schedule:monthly", "until": "2025-12-25", "byday": [ { "weekday": "monday" }, { "weekday": "tuesday" }, { "weekday": "wednesday" }, { "weekday": "thursday" }, { "weekday": "friday" } ], "bysetpos": [ -1 ] } }]]></artwork>]]></sourcecode> </figure> <t><xref target="ex-11"/> indicates a recurrence that occurs every 20 minutes from 9:00 AM to 4:40 PM (UTC), with the exclusion of the occurrence starting at 10:20 AMbeing excludedon 2025-12-01:</t> <figure anchor="ex-11"> <name>Example of Advanced iCalendar Recurrence with Exceptions</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-8:icalendar-recurrence": { "recurrence-first": { "start-time": "2025-12-01T09:00:00Z" }, "until": "2025-12-01T16:40:00Z", "frequency": "ietf-schedule:minutely", "byminute": [ 0, 20, 40 ], "byhour": [ 9, 10, 11, 12, 13, 14, 15, 16 ], "exception-dates": [ "2025-12-01T10:20:00Z" ] } }]]></artwork>]]></sourcecode> </figure> </section> <section anchor="the-schedule-status-grouping"> <name>The "schedule-status" Grouping</name> <t><xref target="ex-12"/> indicates the scheduled recurrence status of <xref target="ex-11"/> at the time of 12:15PM,PM on 2025-12-01 (UTC):</t> <figure anchor="ex-12"> <name>Example of a Schedule Status</name><artwork><![CDATA[<sourcecode type="json"><![CDATA[ { "example-sch-usage-1:schedule-status": { "state": "ietf-schedule:enabled", "version": 1, "schedule-type": "ietf-schedule:recurrence", "counter": 9, "last-occurrence": [ "2025-12-01T12:00:00Z" ], "upcoming-occurrence": [ "2025-12-01T12:20:00Z" ] } }]]></artwork>]]></sourcecode> </figure> <t>At the time of 12:15PM,PM on 2025-12-01 (UTC), the recurring event occurred at (note that the occurrence at 10:20 AM is excluded): 9:00, 9:20, 9:40, 10:00, 10:40, 11:00, 11:20, 11:40, and 12:00. The last occurrence was at 12:00, and the upcoming one is at 12:20.</t> </section> </section> <section anchor="sec-ext"> <name>Examples of Using/Extending the "ietf-schedule" Module</name> <t>This non-normative section shows two examples for how the "ietf-schedule" module can be used or extended for scheduled events or attributes based on date and time.</t> <section anchor="features"> <name>Example: Schedule Tasks to Execute Based on a Recurrence Rule</name> <t>Scheduled tasks can be used to execute specific actions based on certain recurrence rules (e.g., every Friday at 8:00 AM). The following examplemodulemodule, which "uses" the "icalendar-recurrence" grouping from the "ietf-schedule"modulemodule, shows how a scheduled task could be defined with different features used for options.</t><artwork><![CDATA[<sourcecode type="yang"><![CDATA[ module example-scheduled-backup { yang-version 1.1; namespace "http://example.com/example-scheduled-backup"; prefix "ex-scback"; import ietf-inet-types { prefix "inet"; } import ietf-schedule { prefix "schedule"; } organization "Example, Inc."; contact "Support at example.com"; description "Example of a module defining ascheduled basedscheduled-based backup operation."; revision "2023-01-19" { description "InitialVersion.";version."; reference "RFCXXXX:9922: A YANG Data Model for Scheduling."; } container scheduled-backup-tasks { description "A container for backing up all current runningconfigurationconfigurations on the device."; list tasks { key "task-id"; description "The list of backing up tasks on this device."; leaf task-id { type string; description "The task identifier that uniquely identifies a scheduled backup task."; } choice local-or-remote { description "Specifies whether the configuration to be backed up is local or remote."; case local { description "Configuration parameters for the backing up of local devices."; leaf local { type empty; description "The parameter specifies the configuration to be backed up is on the local device."; } } case remote { description "Configuration parameters for backing up of remote devices."; leaf remote { type inet:domain-name; description "The parameter specifies the remote device domain name."; } } } container basic-recurrence-schedules { if-feature schedule:basic-recurrence; description "Basic recurrence schedule specification, which only applies when the schedule:basic-recurrence feature is supported."; leaf schedule-id { type string; description "The schedule identifier for this recurrence rule."; } uses schedule:recurrence-basic { refine frequency { mandatory true; } refine interval { default 1; } } } container icalendar-recurrence-schedules { if-feature schedule:icalendar-recurrence; description "Basic recurrence schedule specification, which only applies when the schedule:icalendar-recurrence feature is supported."; leaf schedule-id { type string; description "The schedule identifier for this recurrence rule."; } uses schedule:icalendar-recurrence { refine workweek-start { default monday; } } } } list schedule-set { key "schedule-name"; description"The list of schedule"Schedule status list for the backup tasks."; uses schedule:schedule-status-with-name; } } }]]></artwork>]]></sourcecode> </section> <section anchor="augments"> <name>Example: Schedule Network Properties to Change Based on Date and Time</name> <t>Network properties may change over a specific period of time or based on a recurrence rule, e.g., <xref target="RFC9657"/>. The following example module, which augments the "recurrence-utc-with-periods" grouping from the "ietf-schedule" module, shows how a scheduled attribute could be defined.</t> <!--[rfced] The example module in Appendix B references RFC 8345 but no corresponding reference entry exists. May we add RFC 8345 under the Informative References section and update the running text as follows? Original: The following example module which augments the "recurrence-utc-with-periods" grouping from "ietf-schedule" module shows how a scheduled attribute could bedefined.</t> <artwork><![CDATA[defined. Perhaps: The following example module, which augments the "recurrence-utc-with-periods" grouping from "ietf-schedule" module, shows how a scheduled attribute could be defined. Note that [RFC8345] and this document are referenced in the module. --> <sourcecode type="yang"><![CDATA[ module example-scheduled-link-bandwidth { yang-version 1.1; namespace "http://example.com/example-scheduled-link-bandwidth"; prefix "ex-scattr"; import ietf-network { prefix "nw"; reference "RFC 8345: A YANG Data Model for Network Topologies"; } import ietf-schedule { prefix "schedule"; reference "RFCXXXX:9922: A YANG Data Model for Scheduling"; } organization "Example, Inc."; contact "Support at example.com"; description "Example of a module defining a scheduled link bandwidth."; revision "2023-01-19" { description "InitialVersion.";version."; reference "RFCXXXX:9922: A YANG Data Model forScheduling.";Scheduling"; } grouping link-bandwidth-grouping { description "Grouping of the link bandwidth definition."; leaf scheduled-bandwidth { type uint64; units "Kbps"; description "Bandwidth values, expressed in kilobits per second."; } } container link-attributes { description "Definition of link attributes."; list link { key "source-node destination-node"; description "Definition of link attributes."; leaf source-node { type nw:node-id; description "Indicates the source node identifier."; } leaf destination-node { type nw:node-id; description "Indicates the source node identifier."; } leaf default-bandwidth { type uint64; units "Kbps"; description "Bandwidth value used forperdiodsperiods that don't match a schedule."; } choice time-variant-type { description "Controls the schedule type."; case period { uses schedule:period-of-time; } case recurrence { uses schedule:recurrence-utc-with-periods { augment "period-timeticks" { description "Specifies the attributes inside eachperiod-timeticks'period-timeticks' entry."; uses link-bandwidth-grouping; } } } } } } }]]></artwork>]]></sourcecode> <t><xref target="ex-13"/> shows a configuration example in XML <xref target="W3C.XML1.0"/> of a link's bandwidth that is scheduled between 2025-12-01 0:00 UTC to the end of 2025-12-31 with a daily schedule. In each day, the bandwidth value is scheduled to be 500 Kbps between 1:00 AM to 6:00 AM and 800 Kbps between 10:00 PM to 11:00 PM. The bandwidth value that is not covered by the period above is 1000 Kbps.</t> <!--[rfced] FYI, a normative reference to the XML specification has been added because this document contains XML. See the IESG statement on "Guidelines for the Use of Formal Languages in IETF Specifications" (https://ietf.org/blog/guidelines-use-formal-languages-ietf-specifications/) - specifically "The use of a language requires a reference to the specification for that language. This reference is normative, and needs to fulfil the usual requirements for normative references (Section 7 of RFC 2026)." Please review where the XML specification is cited and let us know if you prefer otherwise. Original: Figure 24 shows a configuration example of a link's bandwidth that is scheduled between 2025-12-01 0:00 UTC to the end of 2025-12-31 with a daily schedule. Current: Figure 24 shows a configuration example in XML [W3C.XML1.0] of a link's bandwidth that is scheduled between 2025-12-01 0:00 UTC to the end of 2025-12-31 with a daily schedule. Normative Reference Entry: [W3C.XML1.0] Bray, T., Ed., Paoli, J., Ed., Sperberg-McQueen, C.M., Ed., Maler, E., Ed., and F. Yergeau, Ed., "Extensible Markup Language (XML) 1.0 (Fifth Edition)", W3C Recommendation, 26 November 2008, <https://www.w3.org/TR/2008/REC-xml-20081126/>. --> <figure anchor="ex-13"> <name>Example of Scheduled Link's Bandwidth</name><artwork><![CDATA[<sourcecode type="xml"><![CDATA[ <?xml version="1.0" encoding="utf-8"?> <link-attributes xmlns="http://example.com/example-scheduled-link-bandwidth" xmlns:schedule="urn:ietf:params:xml:ns:yang:ietf-schedule"> <link> <source-node>ne1</source-node> <destination-node>ne2</destination-node> <default-bandwidth>1000</default-bandwidth> <recurrence-first> <utc-start-time>2025-12-01T01:00:00Z</utc-start-time> </recurrence-first> <frequency>schedule:daily</frequency> <utc-until>2025-12-31T23:59:59Z</utc-until> <period-timeticks> <period-start>360000</period-start> <period-end>2160000</period-end> <scheduled-bandwidth>500</scheduled-bandwidth> </period-timeticks> <period-timeticks> <period-start>7920000</period-start> <period-end>8280000</period-end> <scheduled-bandwidth>800</scheduled-bandwidth> </period-timeticks> </link> </link-attributes>]]></artwork>]]></sourcecode> </figure> </section> </section> <section anchor="ex-framework"> <name>Examples of Using the "ietf-schedule" Module for Scheduled Use of Resources Framework</name> <t>This section exemplifies how the architecture for supporting scheduled reservation of Traffic Engineering (TE) resources in <xref target="RFC8413"/> might leverage the "period-of-time" grouping defined in the "ietf-schedule" module to implement scheduled use of resources.</t> <t>The following example module shows how a scheduled link capacity reservation could be defined.</t><artwork><![CDATA[<sourcecode type="yang"><![CDATA[ module example-sch-capacity-res { yang-version 1.1; namespace "http://example.com/example-sch-capacity-res"; prefix "ex-schecaparev"; import ietf-network-topology { prefix "nt"; } import ietf-schedule { prefix "schedule"; } container link-capability-reservations { list scheduled-link-capacity { key "schedule-id"; leaf schedule-id { type string; } leaf link-id { type nt:link-id; } leaf reserved-capability { type uint64; units "Mbps"; } uses schedule:period-of-time; } } }]]></artwork>]]></sourcecode> <t><xref section="4" sectionFormat="of" target="RFC8413"/> defines the reference architecture for scheduled use ofresources, theresources. The service requester sends a request to a Path Computation Element (PCE) and includes the parameters of the Label Switched Path (LSP) that the requester wishes tosupply, thesupply. The configuration example to provide the scheduled resource is shown in <xref target="ex-14"/>.</t> <figure anchor="ex-14"> <name>Example of Scheduled Link's Bandwidth Reservation</name><artwork><![CDATA[<sourcecode type="xml"><![CDATA[ <?xml version="1.0" encoding="utf-8"?> <link-capability-reservations xmlns="http://example.com/example-sch-capacity-res" xmlns:schedule="urn:ietf:params:xml:ns:yang:ietf-schedule"> <scheduled-link-capacity> <schedule-id>1</schedule-id> <link-id>1-2-1</link-id> <reserved-capability>500</reserved-capability> <period-start>2025-03-10T08:00:00Z</period-start> <period-end>2025-03-10T09:00:00Z</period-end> </scheduled-link-capacity> <scheduled-link-capacity> <schedule-id>2</schedule-id> <link-id>2-1-1</link-id> <reserved-capability>400</reserved-capability> <period-start>2025-04-01T00:00:00Z</period-start> <duration>PT09:00:00</duration> </scheduled-link-capacity> <scheduled-link-capacity> <schedule-id>3</schedule-id> <link-id>2-1-1</link-id> <reserved-capability>500</reserved-capability> <period-start>2025-04-01T09:00:00Z</period-start> <period-end>2025-04-01T23:59:59Z</period-end> </scheduled-link-capacity> </link-capability-reservations>]]></artwork>]]></sourcecode> </figure> </section> <section numbered="false" anchor="acknowledgments"> <name>Acknowledgments</name> <t>This work is derived fromthe<xref target="I-D.ietf-opsawg-ucl-acl"/>. There is a desire from the OPSAWG to see thismodel bemodule separately defined for wide use in scheduling context.</t> <t>Thanks toAdrian Farrel, Wei Pan, Tianran Zhou, Joe Clarke, Steve Baillargeon, Dhruv Dhody, Robert Wilton, and Italo Busi<contact fullname="Adrian Farrel"/>, <contact fullname="Wei Pan"/>, <contact fullname="Tianran Zhou"/>, <contact fullname="Joe Clarke"/>, <contact fullname="Steve Baillargeon"/>, <contact fullname="Dhruv Dhody"/>, <contact fullname="Robert Wilton"/>, and <contact fullname="Italo Busi"/> for their valuable comments and inputs to this work.</t> <t>Many thanks to the authors of <xref target="I-D.ietf-tvr-schedule-yang"/>, <xref target="I-D.ietf-opsawg-scheduling-oam-tests"/>, and <xref target="I-D.ietf-netmod-eca-policy"/> for the constructive discussion during IETF#118.</t> <t>Other related efforts were explored in the past, e.g., <xref target="I-D.liu-netmod-yang-schedule"/>.</t> <t>Thanks toReshad Rahman<contact fullname="Reshad Rahman"/> for the great YANG Doctors review,Mahesh Jethanandani<contact fullname="Mahesh Jethanandani"/> for the AD review,Per Andersson<contact fullname="Per Andersson"/> for the OPSDIR review,Peter Yee<contact fullname="Peter Yee"/> forgenartthe GENART review, andAcee Lindem<contact fullname="Acee Lindem"/> for thertgdirRTGDIR review.</t> <t>Thanks toÉric Vyncke, Erik Kline, and Mike Bishop<contact fullname="Éric Vyncke"/>, <contact fullname="Erik Kline"/>, and <contact fullname="Mike Bishop"/> for the IESG review.</t> <!-- [rfced] Please review the language set for each instance of sourcecode in the MD file to ensure correctness. If the current list of preferred values for languages (https://www.rfc-editor.org/rpc/wiki/doku.php?id=sourcecode-types) does not contain an applicable language, then feel free to let us know. Also, it is acceptable to leave the language not set. --> <!-- [rfced] RFC 6991 has been obsoleted by RFC 9911. May we replace RFC 6991 with RFC 9911? If yes, this will include updating the references in the YANG module. --> <!-- [rfced] Please review the "Inclusive Language" portion of the online Style Guide <https://www.rfc-editor.org/styleguide/part2/#inclusive_language> and let us know if any changes are needed. Updates of this nature typically result in more precise language, which is helpful for readers. Note that our script did not flag any words in particular, but this should still be reviewed as a best practice. --> </section> </back> <!-- ##markdown-source:H4sIAAAAAAAAA+1963obx7HgfzzFLPyDZAxABG+iaEU2TVKOEt0i0tHxycl3 viEwICcCZpC5kKIl7f99i32W3RfbuvV1egCQohUna36JRc70dFdXV9etq6v6 /X6nSqtpchB1D6OjfDbLs+inw5c/RMdxFUcv8nEyjSZ5EZ2OLpNxPU2zi24n Pj8vkiv4QtrLu4Q+7HZGcZVc5MXNQVRW405nnI+yeAYDjIt4UvXTpJr0s6Sa 5eN+KR/2b+Lsoj/c7JT1+SwtyzTPqps5fPLs5OxpJ6tn50lx0BlDvwedUZ6V SVbW5UFUFXXSATi2O3GRxADPq3lSxBV8XUZxNo5exFl8kcySrOp2rvPi3UWR 13NoxqN3O++SG3g8PuhE/WgUT5NsHBcwQfyz1NPFv3Be+C91AM/KTieuq8u8 wE87EfxM6umUZ/nntJ7AbGBwepEXF3GW/kxQHUR/qOPrJKUXRY5IT8ZplRf0 oKyKJKkOouHmMDrNJ9U1TCo6vEqyOulFP9WXdRwdp9AoHVXUfpRWgOI/pjBY WfMTWK2DaGu4uTnckgd1VuFCHF2mGcOTzOJ0ehDN4n8wnMPvLgmmwSifhSaT RW/rxRP5onCfp9Pp4LpeCPSL/BL+HUff5/UoHsdpEYD/VQHDJ+GFYADfJFmW lBZ827ubm5sueE+hl1Hi4JXHHpyrsb/LaaQwpMcAEeyvPxGZNWB8Dp3HZZUU 0Y9ZepUUJcDljg/PK5gofj/G/g0c48E7ePjdVHUxiEeD+l2nk+XFDLq/go3U 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