Internet DRAFT - draft-united-tvr-schedule-yang
draft-united-tvr-schedule-yang
Internet Y. Qu
Internet-Draft Futurewei Technologies
Intended status: Standards Track A. Lindem
Expires: 4 September 2024 E. Kinzie
D. Fedyk
LabN Consulting, L.L.C.
M. Blanchet
Viagenie
3 March 2024
YANG Data Model for Scheduled Attributes
draft-united-tvr-schedule-yang-01
Abstract
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.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on 4 September 2024.
Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
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and restrictions with respect to this document. Code Components
extracted from this document must include Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Design of the model . . . . . . . . . . . . . . . . . . . . . 3
3.1. Schedule Definitions . . . . . . . . . . . . . . . . . . 3
3.2. TVR Node YANG Module . . . . . . . . . . . . . . . . . . 4
3.3. TVR Topology YANG Module . . . . . . . . . . . . . . . . 4
4. TVR YANG Trees . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. TVR Node YANG Tree . . . . . . . . . . . . . . . . . . . 4
4.2. TVR Topology YANG Tree . . . . . . . . . . . . . . . . . 5
5. TVR Schedule YANG Modules . . . . . . . . . . . . . . . . . . 7
5.1. TVR Schedule YANG Module . . . . . . . . . . . . . . . . 7
5.2. TVR Schedule Node Module . . . . . . . . . . . . . . . . 9
5.3. TVR Toplogy Module . . . . . . . . . . . . . . . . . . . 12
6. Security Considerations . . . . . . . . . . . . . . . . . . . 17
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 18
9. Normative References . . . . . . . . . . . . . . . . . . . . 18
10. Informative References . . . . . . . . . . . . . . . . . . . 19
Appendix A. Example: Add a scheduled cost to OSPF interface . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
1. Overview
YANG [RFC7950] is a data definition language used to define the
contents of a conceptual data store that allows networked devices to
be managed using NETCONF [RFC6241]. YANG is proving relevant beyond
its initial confines, as bindings to other interfaces (e.g., ReST)
and encodings other than XML (e.g., JSON) are being defined.
Furthermore, YANG data models can be used as the basis for
implementation of other interfaces, such as CLI and programmatic
APIs.
In some network scenarios, it's possible to predict the times at
which one router will be able to establish a link with another
router. Links can be predictably lost and re-established, and
neighbors may change as a function of time. For examples of such
networks and scenarios, please reference TVR (Time-Variant Routing)
Use Cases [I-D.ietf-tvr-use-cases].
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The YANG model in this document can be used to manage network
resources and topologies with scheduled attributes. There are three
YANG modules in this document.
Module ietf-tvr-schedule.yang contains the schedule YANG definitions.
Module ietf-tvr-topology.yang defines a network topology with time-
variant availability. Module ietf-tvr-node.yang is to be used to
manage scheduled attributes of a single node.
The YANG modules in this document conform to the Network Management
Datastore Architecture (NMDA) [RFC8342].
1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119] [RFC8174].
2. Tree Diagrams
This document uses the graphical representation of data models
defined in [RFC8340].
3. Design of the model
3.1. Schedule Definitions
Module ietf-tvr-schedule.yang contains schedule definitions that can
be used by other modules.
The grouping "tvr-schedule" consists of a list of schedule, and each
schedule consists time periods with recurrence. For each schedule
instance, it uses the grouping "recurrence" defined in
[I-D.ma-opsawg-schedule-yang].
The container "attr-value" is a place holder for a model that uses
the "tvr-schedule", so attribute values can be augmented.
When an attribute's schedule ends, the "value-default" SHOULD be
used, if present.
The following figure provides an illustration of two attributes and
their scheduled value changes. The attributes A1 and A2 take on
different values at different times. The attribute A1 will take on
the value v1 from the time t0 until t1, the value v2 from t1 until
t2, and v3 from t2 until t3. The attribute A2 will take on the value
vv1 from time t0 until t1 and vv2 from v1 until v3.
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Attributes
+-------------------+----------+------+
A1 | v1 | v2 | v3 |
+-------------------+----------+------+
A2 | vv1 | vv2 |
+-------------------+-----------------+
t0 t1 t2 t3
Time
Figure 1: Time Varying Properties
3.2. TVR Node YANG Module
Module ietf-tvr-node.yang is a device model and designed to manage a
single node with scheduled attributes.
Each node has list of interfaces, and each interface has a list of
power up and down schedules.
3.3. TVR Topology YANG Module
Module ietf-tvr-topology.yang describes a network topology with a
time-variant availability schedule.
The module has a list of nodes, identified by a unique "node-id".
Each node has a list of links. Links are modeled as unidirectional.
Link availability is described from the viewpoint of a particular
source node (the transmitting node) and beginning at a particular
time. Each link in the list contains the range of times during which
it is available.
The "source-link-id" is a string and used to identify a link as
viewed from the source-node. Bandwidth and delay are predicted link
attributes. Delay is the link propagation time and does not include
any queuing delays.
4. TVR YANG Trees
4.1. TVR Node YANG Tree
The following figure shows the tree diagram of the TVR Node
scheduling.
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module: ietf-tvr-node
+--rw node-schedule
+--rw router-id? yang:dotted-quad
+--rw power-schedule
| +--rw power-default? boolean
| +--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw recurrence-first
| | +--rw date-time-start? union
| | +--rw time-zone-identifier? sys:timezone-name
| | +--rw duration? duration
| +--rw frequency? identityref
| +--rw interval? uint32
| +--rw (recurrence-bound)?
| | +--:(until)
| | | +--rw until? union
| | +--:(count)
| | +--rw count? uint32
| +--rw attr-value
| +--rw power-state? boolean
+--rw interface-schedule
+--rw interfaces* [name]
+--rw name union
+--rw state-default? boolean
+--rw up-down-schedule
+--rw schedules* [schedule-id]
+--rw schedule-id uint32
+--rw recurrence-first
| +--rw date-time-start? union
| +--rw time-zone-identifier? sys:timezone-name
| +--rw duration? duration
+--rw frequency? identityref
+--rw interval? uint32
+--rw (recurrence-bound)?
| +--:(until)
| | +--rw until? union
| +--:(count)
| +--rw count? uint32
+--rw attr-value
+--rw available? boolean
4.2. TVR Topology YANG Tree
The following figure shows the tree diagram of the TVR Topology
scheduling.
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module: ietf-tvr-topology
+--rw topology-schedule
+--rw nodes* [node-id]
| +--rw node-id inet:uri
| +--rw available
| +--rw default-node-available? boolean
| +--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw recurrence-first
| | +--rw date-time-start? union
| | +--rw time-zone-identifier? sys:timezone-name
| | +--rw duration? duration
| +--rw frequency? identityref
| +--rw interval? uint32
| +--rw (recurrence-bound)?
| | +--:(until)
| | | +--rw until? union
| | +--:(count)
| | +--rw count? uint32
| +--rw attr-value
| +--rw node-available? boolean
+--rw links* [source-node source-link-id]
+--rw source-node inet:uri
+--rw destination-node? inet:uri
+--rw source-link-id string
+--rw available
+--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw recurrence-first
| | +--rw date-time-start? union
| | +--rw time-zone-identifier? sys:timezone-name
| | +--rw duration? duration
| +--rw frequency? identityref
| +--rw interval? uint32
| +--rw (recurrence-bound)?
| | +--:(until)
| | | +--rw until? union
| | +--:(count)
| | +--rw count? uint32
| +--rw attr-value
+--rw bandwidth
| +--rw default-bandwidth? te-types:te-bandwidth
| +--rw schedules* [schedule-id]
| +--rw schedule-id uint32
| +--rw recurrence-first
| | +--rw date-time-start? union
| | +--rw time-zone-identifier? sys:timezone-name
| | +--rw duration? duration
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| +--rw frequency? identityref
| +--rw interval? uint32
| +--rw (recurrence-bound)?
| | +--:(until)
| | | +--rw until? union
| | +--:(count)
| | +--rw count? uint32
| +--rw attr-value
| +--rw bandwidth? te-types:te-bandwidth
+--rw delay
+--rw default-delay? uint32
+--rw schedules* [schedule-id]
+--rw schedule-id uint32
+--rw recurrence-first
| +--rw date-time-start? union
| +--rw time-zone-identifier? sys:timezone-name
| +--rw duration? duration
+--rw frequency? identityref
+--rw interval? uint32
+--rw (recurrence-bound)?
| +--:(until)
| | +--rw until? union
| +--:(count)
| +--rw count? uint32
+--rw attr-value
+--rw delay? uint32
5. TVR Schedule YANG Modules
5.1. TVR Schedule YANG Module
<CODE BEGINS> file "ietf-tvr-schedule@2024-03-03.yang"
module ietf-tvr-schedule {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-tvr-schedule";
prefix tvr-schd;
import ietf-schedule {
prefix "schedule";
reference
"RFC XXXX: A Common YANG Data Model for Scheduling";
}
organization
"IETF TVR - Time Variant Routing Working Group";
contact
"WG Web: <http://datatracker.ietf.org/wg/tvr>
WG List: <mailto:tvr@ietf.org>
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Author: Yingzhen Qu
<mailto:yingzhen.ietf@gmail.com>
Author: Acee Lindem
<mailto:acee.ietf@gmail.com>
Author: Marc Blanchet
<mailto:marc.blanchet@viagenie.ca>
Author: Eric Kinzie
<mailto:ekinzie@labn.net>
Author: Don Fedyk
<mailto:dfedyk@labn.net>";
description
"The YANG module contains common YANG definitions for
time-variant schedule.
This YANG model conforms to the Network Management
Datastore Architecture (NMDA) as described in RFC 8342.
Copyright (c) 2024 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
'MAY', and 'OPTIONAL' in this document are to be interpreted as
described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
they appear in all capitals, as shown here.";
reference
"RFC XXXX: YANG Data Model for Scheduled Attributes";
revision 2024-03-03 {
description
"Initial Version";
reference
"RFC XXXX: YANG Data Model for Scheduled Attributes.";
}
grouping tvr-schedule {
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list schedules {
key schedule-id;
leaf schedule-id {
type uint32;
description
"Identifies the schedule.";
}
uses schedule:recurrence;
container attr-value {
description
"Attribute value(s). This container should be augmented
with attributes that apply to the current interval.";
}
description
"list of schedules.";
}
description
"A common grouping defintion of schedules.";
}
}
<CODE ENDS>
5.2. TVR Schedule Node Module
<CODE BEGINS> file "ietf-tvr-node@2024-03-03.yang"
module ietf-tvr-node {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-tvr-node";
prefix tvr-node;
import ietf-yang-types {
prefix "yang";
reference
"RFC 6991: Common YANG Data Types";
}
import ietf-tvr-schedule {
prefix "tvr-schd";
}
organization
"IETF TVR - Time Variant Routing Working Group";
contact
"WG Web: <http://datatracker.ietf.org/wg/tvr>
WG List: <mailto:tvr@ietf.org>
Author: Yingzhen Qu
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<mailto:yingzhen.ietf@gmail.com>
Author: Acee Lindem
<mailto:acee.ietf@gmail.com>
Author: Marc Blanchet
<mailto:marc.blanchet@viagenie.ca>
Author: Eric Kinzie
<mailto:ekinzie@labn.net>
Author: Don Fedyk
<mailto:dfedyk@labn.net>";
description
"The YANG module defines a schedule for changing
attributes of a single node.
This YANG model conforms to the Network Management
Datastore Architecture (NMDA) as described in RFC 8342.
Copyright (c) 2024 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.
The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
'MAY', and 'OPTIONAL' in this document are to be interpreted as
described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
they appear in all capitals, as shown here.";
reference
"RFC XXXX: YANG Data Model for Scheduled Attributes";
revision 2024-03-03 {
description
"Initial Version";
reference
"RFC XXXX: YANG Data Model for Scheduled Attributes.";
}
container node-schedule {
description
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"This container defined time variant attributes
for node's schedule.";
leaf router-id {
type yang:dotted-quad;
description
"A 32-bit number used to identify a router.";
}
container power-schedule {
description
"Power schedule for the node. The node's power is
represented by a boolean value with 'true' indicating
the node is powered on and 'false' indicating the node
is powered off.";
leaf power-default {
type boolean;
default false;
description
"This indicates the default node power when for
time periods when no interval is defined. If
unspecified, the node is powered down by default.";
}
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
description
"Augment the power state within each period.";
leaf power-state {
type boolean;
description
"Indicates whether the node is powered on.";
}
}
}
}
container interface-schedule {
description
"Container for TVR node interface attributes.";
list interfaces {
key "name";
description
"List of interface with schedules.";
leaf name {
type union {
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type yang:xpath1.0;
type string;
}
description
"Name of the interface.
If used with the ietf-interfaces module, the xpath name
is to identify the interface.";
}
leaf state-default{
type boolean;
default false;
description
"By default, the link is not available.";
}
container up-down-schedule {
description
"Scheduled times that the interface is up. This is to
work with the leaf 'enabled' for the configured state
of the interface.";
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
description
"Augment scheduled interface state.";
leaf available {
type boolean;
description
"Link availability.";
}
}
}
}
}
}
}
}
<CODE ENDS>
5.3. TVR Toplogy Module
<CODE BEGINS> file "ietf-tvr-topology@2024-03-03.yang"
module ietf-tvr-topology {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-tvr-topology";
prefix tvr-topo;
import ietf-inet-types {
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prefix inet;
reference
"RFC 6991: Common YANG Data Types";
}
import ietf-te-types {
prefix te-types;
}
import ietf-tvr-schedule {
prefix "tvr-schd";
}
organization
"IETF Time-Variant Routing Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/tvr/>
WG List: <mailto:tvr@ietf.org>
Author: Eric Kinzie
<mailto:ekinzie@labn.net>
Author: Don Fedyk
<mailto:dfedyk@labn.net>
Author: Yingzhen Qu
<mailto:yingzhen.ietf@gmail.com>
Author: Acee Lindem
<mailto:acee.ietf@gmail.com>
Author: Marc Blanchet
<mailto:marc.blanchet@viagenie.ca>";
description
"This YANG module contains YANG definitions for describing
network topology with an time-variant availability schedule.
Copyright (c) 2024 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set forth
in Section 4.c of the IETF Trust's Legal Provisions Relating
to IETF Documents (https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX
(https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
for full legal notices.
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The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL
NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED',
'MAY', and 'OPTIONAL' in this document are to be interpreted as
described in BCP 14 (RFC 2119) (RFC 8174) when, and only when,
they appear in all capitals, as shown here.";
revision 2024-03-03 {
description
"Initial revision";
reference
"RFC XXXX: YANG Data Model for Scheduled Attributes";
}
container topology-schedule {
description
"Network topology schedules.";
list nodes {
key "node-id";
description
"List of nodes with schedules.";
leaf node-id {
type inet:uri;
description
"Identifier for a node, uniquely identifies a node. This
may be the same as the node-id defined in the ietf-network
module defined in RFC 8345.";
}
container available {
description
"The time at which this node becomes available.";
leaf default-node-available {
type boolean;
default false;
description
"By default, the node is powered off.";
}
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
description
"Augment scheduled node availability.";
leaf node-available {
type boolean;
description
"Node availability.";
}
}
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}
}
}
list links {
key "source-node source-link-id";
description
"List of links.";
leaf source-node {
type inet:uri;
description
"A name refers to the source node of the link.";
}
leaf destination-node {
type inet:uri;
description
"A name refers to the destination node of the link.";
}
leaf source-link-id {
type string;
description
"A name refers to the link of the source node.";
}
container available {
description
"The time at which this link becomes available.";
uses tvr-schd:tvr-schedule;
container bandwidth {
description
"Scheduled link bandwidth.
If the value measured by the system is less than this
value, the system value is used. If the value measured
by the system is greater than this value the predicted
value SHOULD be used.";
leaf default-bandwidth {
type te-types:te-bandwidth;
default "0";
description
"The default link capacity specified in a
generic format.";
}
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
description
"Augment scheduled interface bandwidth.";
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leaf bandwidth {
type te-types:te-bandwidth;
description
"The predicted link capacity specified in a
generic format.";
}
}
}
}
container delay {
description
"The one-way delay or latency in microseconds. If the
value measured by the system is less than this value
the predicted value SHOULD be used.";
leaf default-delay {
type uint32 {
range "0..16777215";
}
description
"The default link capacity specified in a
generic format.";
}
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
description
"Augment scheduled delay.";
leaf delay {
type uint32 {
range "0..16777215";
}
description
"The predicted link delay specified in a
generic format.";
}
}
}
}
}
}
}
}
<CODE ENDS>
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6. Security Considerations
The YANG modules specified in this document define a schema for data
that is designed to be accessed via network management protocols such
as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer
is the secure transport layer, and the mandatory-to-implement secure
transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer
is HTTPS, and the mandatory-to-implement secure transport is TLS
[RFC8446].
The NETCONF access control model [RFC8341] provides the means to
restrict access for particular NETCONF or RESTCONF users to a pre-
configured subset of all available NETCONF or RESTCONF protocol
operations and content.
There are a number of data nodes defined in ietf-tvr-node.yang module
and ietf-tvr-topology.yang that are writable/creatable/deletable
(i.e., config true, which is the default). These data nodes may be
considered sensitive or vulnerable in some network environments.
Write operations (e.g., edit-config) to these data nodes without
proper protection can have a negative effect on network operations.
There are the subtrees and data nodes and their sensitivity/
vulnerability:
/node-schedule/power-schedule
/node-schedule/interface-schedule
/topology-schedule/nodes/available
/topology-schedule/links/available Modifications to these
scheduled attributes may result in a denial of service.
Some of the readable data nodes in the ietf-tvr-node.yang module and
ietf-tvr-topolgy.yang module may be considered sensitive or
vulnerable in some network environments. It is thus important to
control read access (e.g., via get, get-config, or notification) to
these data nodes.
7. IANA Considerations
This document registers a URI in the IETF XML registry [RFC3688].
Following the format in [RFC3688], the following registration is
requested to be made:
URI: urn:ietf:params:xml:ns:yang:ietf-tvr-schedule
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
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URI: urn:ietf:params:xml:ns:yang:ietf-tvr-node
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
URI: urn:ietf:params:xml:ns:yang:ietf-tvr-topology
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
This document registers a YANG module in the YANG Module Names
registry [RFC6020].
name: ietf-tvr-schedule
namespace: urn:ietf:params:xml:ns:yang:ietf-tvr-schedule
prefix: tvr-schd
reference: RFC XXXX
name: ietf-tvr-node
namespace: urn:ietf:params:xml:ns:yang:ietf-tvr-node
prefix: tvr-node
reference: RFC XXXX
name: ietf-tvr-topology
namespace: urn:ietf:params:xml:ns:yang:ietf-tvr-topology
prefix: tvr-topo
reference: RFC XXXX
8. Acknowledgements
The YANG model was developed using the suite of YANG tools written
and maintained by numerous authors.
9. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
DOI 10.17487/RFC6020, October 2010,
<https://www.rfc-editor.org/info/rfc6020>.
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[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
<https://www.rfc-editor.org/info/rfc6241>.
[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
<https://www.rfc-editor.org/info/rfc6242>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC7950, August 2016,
<https://www.rfc-editor.org/info/rfc7950>.
[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
<https://www.rfc-editor.org/info/rfc8040>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC8341, March 2018,
<https://www.rfc-editor.org/info/rfc8341>.
[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
<https://www.rfc-editor.org/info/rfc8342>.
[RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol
Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
<https://www.rfc-editor.org/info/rfc8446>.
[I-D.ma-opsawg-schedule-yang]
Ma, Q., Wu, Q., Boucadair, M., and D. King, "A Common YANG
Data Model for Scheduling", Work in Progress, Internet-
Draft, draft-ma-opsawg-schedule-yang-04, 1 March 2024,
<https://datatracker.ietf.org/doc/html/draft-ma-opsawg-
schedule-yang-04>.
10. Informative References
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[RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
<https://www.rfc-editor.org/info/rfc8340>.
[I-D.ietf-tvr-use-cases]
Birrane, E. J., Kuhn, N., and Y. Qu, "TVR (Time-Variant
Routing) Use Cases", Work in Progress, Internet-Draft,
draft-ietf-tvr-use-cases-01, 3 July 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-tvr-use-
cases-01>.
Appendix A. Example: Add a scheduled cost to OSPF interface
In OSPF (Open Shortest Path First), the interface cost is a metric
used to determine the preference or desirability of a particular link
or interface. By default, the OSPF interface cost is calculated
based on the bandwidth of the interface, and it is also configurable.
This example demonstrates how an OSPF interface can be extended with
a cost that changes with a schedule.
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module ietf-tvr-ospf-schedule {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-tvr-ospf-schedule";
prefix ospf-schedule;
import ietf-routing {
prefix "rt";
reference
"RFC 8349: A YANG Data Model for Routing
Management (NMDA Version)";
}
import ietf-ospf {
prefix "ospf";
reference
"RFC 9129: A YANG Data Model for OSPF Protocol";
}
import ietf-tvr-schedule {
prefix "tvr-schd";
}
augment "/rt:routing/rt:control-plane-protocols/"
+ "rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area/"
+ "ospf:interfaces/ospf:interface" {
container scheduled-cost {
description
"Augment OSPF interface with a scheduled interface cost.";
uses tvr-schd:tvr-schedule {
augment "schedules/attr-value" {
leaf cost {
type uint32;
description
"interface cost";
}
}
}
}
}
}
Authors' Addresses
Yingzhen Qu
Futurewei Technologies
2330 Central Expressway
Santa Clara, CA 95050
United States of America
Email: yingzhen.ietf@gmail.com
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Acee Lindem
LabN Consulting, L.L.C.
301 Midenhall Way
Cary, NC 27513
Email: acee.ietf@gmail.com
Eric Kinzie
LabN Consulting, L.L.C.
Email: ekinzie@labn.net
Don Fedyk
LabN Consulting, L.L.C.
Email: dfedyk@labn.net
Marc Blanchet
Viagenie
Email: marc.blanchet@viagenie.ca
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