Internet DRAFT - draft-ietf-ccamp-otn-path-computation-yang
draft-ietf-ccamp-otn-path-computation-yang
CCAMP Working Group I. Busi
Internet-Draft Huawei Technologies
Intended status: Standards Track A. Guo
Expires: 22 April 2024 Futurewei Technologies
S. Belotti
Nokia
20 October 2023
A YANG Data Model for requesting Path Computation in an Optical
Transport Network (OTN)
draft-ietf-ccamp-otn-path-computation-yang-02
Abstract
This document provides a mechanism to request path computation in an
Optical Transport Network (OTN) by augmenting the Remote Procedure
Calls (RPCs) defined in RFC YYYY.
[RFC EDITOR NOTE: Please replace RFC YYYY with the RFC number of
draft-ietf-teas-yang-path-computation once it has been published.
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
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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 22 April 2024.
Copyright Notice
Copyright (c) 2023 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. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology and Notations . . . . . . . . . . . . . . . . 3
1.2. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 3
1.3. Prefix in Data Node Names . . . . . . . . . . . . . . . . 3
2. YANG Data Model for OTN Path Computation . . . . . . . . . . 4
2.1. YANG Model Overview . . . . . . . . . . . . . . . . . . . 4
2.2. Bandwidth Augmentation . . . . . . . . . . . . . . . . . 5
2.3. Label Augmentations . . . . . . . . . . . . . . . . . . . 5
3. OTN Path Computation Tree Diagram . . . . . . . . . . . . . . 5
4. YANG Model for OTN Path Computation . . . . . . . . . . . . . 10
5. Manageability Considerations . . . . . . . . . . . . . . . . 16
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1. Normative References . . . . . . . . . . . . . . . . . . 17
8.2. Informative References . . . . . . . . . . . . . . . . . 18
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . 19
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 19
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
[I-D.ietf-teas-yang-path-computation] describes key use cases, where
a client needs to request underlying SDN controllers for path
computation. In some of these use cases, the underlying SDN
controller can control an Optical Transport Network (OTN).
This document defines a YANG data model, which augment the generic
Path Computation RPC defined in
[I-D.ietf-teas-yang-path-computation], with OTN technology-specific
augmentations required to request path computation to an underlying
OTN SDN controller. These models allow a client to delegate path
computation tasks to the underlying SDN controller without having to
obtain OTN detailed information from the controller and performing
feasible path computation itself.
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1.1. Terminology and Notations
Refer to [I-D.ietf-ccamp-otn-topo-yang] and
[I-D.ietf-ccamp-layer1-types] for the OTN specific terms used in this
document.
The following terms are defined in [RFC7950] and are not redefined
here:
* client
* server
* augment
* data model
* data node
The following terms are defined in [RFC6241] and are not redefined
here:
* configuration data
* state data
The terminology for describing YANG data models is found in
[RFC7950].
1.2. Tree Diagram
A simplified graphical representation of the data model is used in
Section 3 of this document. The meaning of the symbols in these
diagrams is defined in [RFC8340].
1.3. Prefix in Data Node Names
In this document, names of data nodes and other data model objects
are prefixed using the standard prefix associated with the
corresponding YANG imported modules, as shown in Table 1.
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+==========+===========================+===========+
| Prefix | YANG module | Reference |
+==========+===========================+===========+
| l1-types | ietf-layer1-types | [RFCZZZZ] |
+----------+---------------------------+-----------+
| te | ietf-te | [RFCKKKK] |
+----------+---------------------------+-----------+
| te-pc | ietf-te-path-computation | [RFCYYYY] |
+----------+---------------------------+-----------+
| otn-pc | ietf-otn-path-computation | RFCXXXX |
+----------+---------------------------+-----------+
Table 1: Prefixes and corresponding YANG modules
RFC Editor Note: Please replace XXXX with the RFC number assigned to
this document. Please replace YYYY with the RFC number assigned to
[I-D.ietf-teas-yang-path-computation]. Please replace ZZZZ with the
RFC number assigned to [I-D.ietf-ccamp-layer1-types]. Please replace
KKKK with the RFC number assigned to [I-D.ietf-teas-yang-te]. Please
remove this note.
2. YANG Data Model for OTN Path Computation
2.1. YANG Model Overview
The YANG data model for requesting OTN path computation is defined as
an augmentation of the generic Path Computation RPC defined in
[I-D.ietf-teas-yang-path-computation], as shown in Figure 1.
+--------------------------+ o: augment
TE generic | ietf-te-path-computation |
+--------------------------+
o
|
|
|
+---------------------------+
OTN | ietf-otn-path-computation |
+---------------------------+
Figure 1: Relationship between OTN and TE path computation models
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The entities and Traffic Engineering (TE) attributes, such as
requested path and tunnel attributes, defined in
[I-D.ietf-teas-yang-path-computation], are still applicable when
requesting OTN path computation and the models defined in this
document only specifies the additional OTN technology-specific
attributes/information, using the attributes defined in
[I-D.ietf-ccamp-layer1-types].
The YANG module ietf-otn-path-computation defined in this document
conforms to the Network Management Datastore Architecture (NMDA)
defined in [RFC8342].
2.2. Bandwidth Augmentation
The OTN path computation model augments all the occurrences of the
te-bandwidth container with the OTN technology-specific attributes
using the otn-link-bandwidth and otn-path-bandwidth groupings defined
in [I-D.ietf-ccamp-layer1-types].
2.3. Label Augmentations
The OTN path computation model augments all the occurrences of the
label-restriction list with OTN technology-specific attributes using
the otn-label-range-info grouping defined in
[I-D.ietf-ccamp-layer1-types].
Moreover, the model augments all the occurrences of the te-label
container with the OTN technology-specific attributes using the otn-
label-start-end, otn-label-hop and otn-label-step groupings defined
in [I-D.ietf-ccamp-layer1-types].
3. OTN Path Computation Tree Diagram
Figure 2 below shows the tree diagram of the YANG data model defined
in module ietf-otn-path-computation.yang.
module: ietf-otn-path-computation
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:te-bandwidth/te-pc:technology:
+--:(otn)
+-- otn
+-- odu-type? identityref
+-- (oduflex-type)?
+--:(generic)
| +-- nominal-bit-rate union
+--:(cbr)
| +-- client-type identityref
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+--:(gfp-n-k)
| +-- gfp-n uint8
| +-- gfp-k? gfp-k
+--:(flexe-client)
| +-- flexe-client flexe-client-rate
+--:(flexe-aware)
| +-- flexe-aware-n uint16
+--:(packet)
+-- opuflex-payload-rate union
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:tunnel-attributes/te-pc:te-bandwidth
/te-pc:technology:
+--:(otn)
+-- otn
+-- odu-type? identityref
+-- (oduflex-type)?
+--:(generic)
| +-- nominal-bit-rate union
+--:(cbr)
| +-- client-type identityref
+--:(gfp-n-k)
| +-- gfp-n uint8
| +-- gfp-k? gfp-k
+--:(flexe-client)
| +-- flexe-client flexe-client-rate
+--:(flexe-aware)
| +-- flexe-aware-n uint16
+--:(packet)
+-- opuflex-payload-rate union
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/te-pc:response/te-pc:computed-paths-properties
/te-pc:computed-path-properties/te-pc:path-properties
/te-pc:te-bandwidth/te-pc:technology:
+--:(otn)
+--ro otn
+--ro odu-type? identityref
+--ro (oduflex-type)?
+--:(generic)
| +--ro nominal-bit-rate union
+--:(cbr)
| +--ro client-type identityref
+--:(gfp-n-k)
| +--ro gfp-n uint8
| +--ro gfp-k? gfp-k
+--:(flexe-client)
| +--ro flexe-client flexe-client-rate
+--:(flexe-aware)
| +--ro flexe-aware-n uint16
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+--:(packet)
+--ro opuflex-payload-rate union
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-in-segment
/te-pc:label-restrictions/te-pc:label-restriction:
+-- otn-label-range
+-- range-type? otn-label-range-type
+-- tsg? identityref
+-- odu-type-list* identityref
+-- priority? uint8
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-out-segment
/te-pc:label-restrictions/te-pc:label-restriction:
+-- otn-label-range
+-- range-type? otn-label-range-type
+-- tsg? identityref
+-- odu-type-list* identityref
+-- priority? uint8
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:optimizations/te-pc:algorithm
/te-pc:metric/te-pc:optimization-metric
/te-pc:explicit-route-exclude-objects
/te-pc:route-object-exclude-object/te-pc:type/te-pc:label
/te-pc:label-hop/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- tpn? otn-tpn
+-- tsg? identityref
+-- ts-list? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:optimizations/te-pc:algorithm
/te-pc:metric/te-pc:optimization-metric
/te-pc:explicit-route-include-objects
/te-pc:route-object-include-object/te-pc:type/te-pc:label
/te-pc:label-hop/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- tpn? otn-tpn
+-- tsg? identityref
+-- ts-list? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:explicit-route-objects-always
/te-pc:route-object-exclude-always/te-pc:type/te-pc:label
/te-pc:label-hop/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- tpn? otn-tpn
+-- tsg? identityref
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+-- ts-list? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:explicit-route-objects-always
/te-pc:route-object-include-exclude/te-pc:type
/te-pc:label/te-pc:label-hop/te-pc:te-label
/te-pc:technology:
+--:(otn)
+-- otn
+-- tpn? otn-tpn
+-- tsg? identityref
+-- ts-list? string
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-in-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-start/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-in-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-end/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-in-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-step/te-pc:technology:
+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-out-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-start/te-pc:te-label/te-pc:technology:
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+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-out-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-end/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:path-request/te-pc:path-out-segment
/te-pc:label-restrictions/te-pc:label-restriction
/te-pc:label-step/te-pc:technology:
+--:(otn)
+-- otn
+-- (range-type)?
+--:(trib-port)
| +-- tpn? otn-tpn
+--:(trib-slot)
+-- ts? otn-ts
augment /te:tunnels-path-compute/te:input/te:path-compute-info
/te-pc:synchronization/te-pc:exclude-objects
/te-pc:excludes/te-pc:type/te-pc:label/te-pc:label-hop
/te-pc:te-label/te-pc:technology:
+--:(otn)
+-- otn
+-- tpn? otn-tpn
+-- tsg? identityref
+-- ts-list? string
augment /te:tunnels-path-compute/te:output/te:path-compute-result
/te-pc:response/te-pc:computed-paths-properties
/te-pc:computed-path-properties/te-pc:path-properties
/te-pc:path-route-objects/te-pc:path-route-object
/te-pc:type/te-pc:label/te-pc:label-hop/te-pc:te-label
/te-pc:technology:
+--:(otn)
+--ro otn
+--ro tpn? otn-tpn
+--ro tsg? identityref
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+--ro ts-list? string
Figure 2: OTN path computation tree diagram
4. YANG Model for OTN Path Computation
<CODE BEGINS> file "ietf-otn-path-computation@2022-07-10.yang"
module ietf-otn-path-computation {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-otn-path-computation";
prefix "otn-pc";
import ietf-te-path-computation {
prefix "te-pc";
revision-date "2021-09-06";
reference
"I-D.ietf-teas-yang-path-computation-14: Yang model
for requesting Path Computation.";
}
import ietf-te {
prefix "te";
revision-date "2021-02-20";
reference
"I-D.ietf-teas-yang-te-19: A YANG Data Model for Traffic
Engineering Tunnels and Interfaces. ";
}
import ietf-layer1-types {
prefix "l1-types";
reference
"I-D.ietf-ccamp-layer1-types:
A YANG Data Model for Layer 1 Types. ";
}
organization
"IETF CCAMP Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/ccamp/>
WG List: <mailto:ccamp@ietf.org>
Editor: Aihua Guo
<mailto:aihuaguo.ietf@gmail.com>
Editor: Italo Busi
<mailto:italo.busi@huawei.com>
Editor: Sergio Belotti
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<mailto:sergio.belotti@nokia.com>";
description
"This module defines a model for requesting
OTN Path Computation.
The model fully conforms to the Network Management
Datastore Architecture (NMDA).
Copyright (c) 2022 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; see
the RFC itself for full legal notices.";
revision "2022-09-12" {
description
"Initial version.";
reference
"RFC XXXX: A YANG Data Model for requesting Path Computation
in an Optical Transport Network (OTN)";
// RFC Ed.: replace XXXX with actual RFC number, update date
// information and remove this note
}
/*
* Data nodes
*/
/*
* Augment TE bandwidth
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:te-bandwidth/te-pc:technology" {
description
"Augment TE bandwidth of the requested path.";
case otn {
uses l1-types:otn-path-bandwidth;
}
}
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augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:tunnel-attributes/te-pc:te-bandwidth/"
+ "te-pc:technology" {
description
"Augment TE bandwidth of the requested tunnel attributes.";
case otn {
uses l1-types:otn-path-bandwidth;
}
}
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/te-pc:response/"
+ "te-pc:computed-paths-properties/"
+ "te-pc:computed-path-properties/te-pc:path-properties/"
+ "te-pc:te-bandwidth/te-pc:technology" {
description
"Augment TE bandwidth of the computed path properties.";
case otn {
uses l1-types:otn-path-bandwidth;
}
}
/*
* Augment TE label range information
*/
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-in-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction" {
description
"Augment TE label range information for the ingress segment
of the requested path.";
uses l1-types:otn-label-range-info;
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-out-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction" {
description
"Augment TE label range information for the egress segment
of the requested path.";
uses l1-types:otn-label-range-info;
}
/*
* Augment TE label.
*/
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augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:optimizations/te-pc:algorithm/"
+ "te-pc:metric/te-pc:optimization-metric/"
+ "te-pc:explicit-route-exclude-objects/"
+ "te-pc:route-object-exclude-object/te-pc:type/te-pc:label/"
+ "te-pc:label-hop/te-pc:te-label/te-pc:technology" {
description
"Augment TE label hop for the optimization of the explicit
route objects excluded by the path computation of the requested
path.";
case otn {
uses l1-types:otn-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:optimizations/te-pc:algorithm/"
+ "te-pc:metric/te-pc:optimization-metric/"
+ "te-pc:explicit-route-include-objects/"
+ "te-pc:route-object-include-object/te-pc:type/te-pc:label/"
+ "te-pc:label-hop/te-pc:te-label/te-pc:technology" {
description
"Augment TE label hop for the optimization of the explicit
route objects included by the path computation of the requested
path.";
case otn {
uses l1-types:otn-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:explicit-route-objects-always/"
+ "te-pc:route-object-exclude-always/te-pc:type/te-pc:label/"
+ "te-pc:label-hop/te-pc:te-label/te-pc:technology" {
description
"Augment TE label hop for the explicit route objects always
excluded by the path computation of the requested path.";
case otn {
uses l1-types:otn-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:explicit-route-objects-always/"
+ "te-pc:route-object-include-exclude/te-pc:type/"
+ "te-pc:label/te-pc:label-hop/te-pc:te-label/"
+ "te-pc:technology" {
description
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"Augment TE label hop for the explicit route objects included
or excluded by the path computation of the requested path.";
case otn {
uses l1-types:otn-label-hop;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-in-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-start/te-pc:te-label/te-pc:technology" {
description
"Augment TE label range start for the ingress segment
of the requested path.";
case otn {
uses l1-types:otn-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-in-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-end/te-pc:te-label/te-pc:technology" {
description
"Augment TE label range end for the ingress segment
of the requested path.";
case otn {
uses l1-types:otn-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-in-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-step/te-pc:technology" {
description
"Augment TE label range step for the ingress segment
of the requested path.";
case otn {
uses l1-types:otn-label-step;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-out-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-start/te-pc:te-label/te-pc:technology" {
description
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"Augment TE label range start for the egress segment
of the requested path.";
case otn {
uses l1-types:otn-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-out-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-end/te-pc:te-label/te-pc:technology" {
description
"Augment TE label range end for the egress segment
of the requested path.";
case otn {
uses l1-types:otn-label-start-end;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:path-request/te-pc:path-out-segment/"
+ "te-pc:label-restrictions/te-pc:label-restriction/"
+ "te-pc:label-step/te-pc:technology" {
description
"Augment TE label range end for the egress segment
of the requested path.";
case otn {
uses l1-types:otn-label-step;
}
}
augment "/te:tunnels-path-compute/te:input/te:path-compute-info/"
+ "te-pc:synchronization/te-pc:exclude-objects/"
+ "te-pc:excludes/te-pc:type/te-pc:label/te-pc:label-hop/"
+ "te-pc:te-label/te-pc:technology" {
description
"Augment TE label hop for the explicit route objects to always
exclude from synchronized path computation.";
case otn {
uses l1-types:otn-label-hop;
}
}
augment "/te:tunnels-path-compute/te:output/"
+ "te:path-compute-result/te-pc:response/"
+ "te-pc:computed-paths-properties/"
+ "te-pc:computed-path-properties/te-pc:path-properties/"
+ "te-pc:path-route-objects/te-pc:path-route-object/"
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+ "te-pc:type/te-pc:label/"
+ "te-pc:label-hop/te-pc:te-label/te-pc:technology" {
description
"Augment TE label hop for the route object of the computed
path.";
case otn {
uses l1-types:otn-label-hop;
}
}
}
<CODE ENDS>
Figure 3: OTN path computation YANG module
5. Manageability Considerations
This document provides a method for requesting path computations for
OTN tunnels. Consideration of mechanisms to gather and collate
information required for the path computations will be necessary.
Furthermore, storing path computation requests and responses and
triggering actions will also need to be carefully managed and
secured.
Future versions of this document will contain additional information.
6. Security Considerations
The YANG module defined in this document will be accessed via the
NETCONF protocol [RFC6241] or RESTCONF protocol [RFC8040]. The
lowest NETCONF layer is the secure transport layer, and the
mandatory-to-implement secure transport is Secure Shell (SSH)
[RFC6242]. The lowest RESTCONF layer is HTTPS and the mandatory-to-
implement secure transport is TLS [RFC8446].
The Network Configuration Access Control Model (NACM) [RFC8341]
provides the means to restrict access to particular NETCONF or
RESTCONF users to a pre-configured subset of all available NETCONF or
RESTCONF protocol operations and content.
Some of the RPC operations defined in this YANG module may be
considered sensitive or vulnerable in some network environments. It
is thus essential to control access to these operations.
Operations defined in this document, and their sensitivities and
possible vulnerabilities, will be discussed further in future
versions of this document.
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7. IANA Considerations
This document registers the following URIs in the "ns" subregistry
within the "IETF XML registry" [RFC3688].
URI: urn:ietf:params:xml:ns:yang:ietf-otn-path-computation
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
This document registers the following YANG module in the "YANG Module
Names" registry [RFC7950].
name: ietf-otn-path-computation
namespace: urn:ietf:params:xml:ns:yang:ietf-otn-path-computation
prefix: otn-pc
reference: this document
8. References
8.1. Normative References
[I-D.ietf-ccamp-layer1-types]
Zheng, H. and I. Busi, "A YANG Data Model for Layer 1
Types", Work in Progress, Internet-Draft, draft-ietf-
ccamp-layer1-types-16, 10 July 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
layer1-types-16>.
[I-D.ietf-teas-yang-path-computation]
Busi, I., Belotti, S., de Dios, O. G., Sharma, A., and Y.
Shi, "A YANG Data Model for requesting path computation",
Work in Progress, Internet-Draft, draft-ietf-teas-yang-
path-computation-21, 7 July 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
yang-path-computation-21>.
[I-D.ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I.
Bryskin, "A YANG Data Model for Traffic Engineering
Tunnels, Label Switched Paths and Interfaces", Work in
Progress, Internet-Draft, draft-ietf-teas-yang-te-34, 1
October 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-teas-yang-te-34>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
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Internet-Draft YANG for OTN Path Computation October 2023
[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>.
[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>.
[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>.
[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>.
8.2. Informative References
[I-D.draft-gbb-ccamp-optical-path-computation-yang]
Busi, I., Guo, A., and S. Belotti, "YANG Data Models for
requesting Path Computation in Optical Networks", Work in
Progress, Internet-Draft, draft-gbb-ccamp-optical-path-
computation-yang-02, 12 September 2022,
<https://datatracker.ietf.org/doc/html/draft-gbb-ccamp-
optical-path-computation-yang-02>.
[I-D.ietf-ccamp-otn-topo-yang]
Zheng, H., Busi, I., Liu, X., Belotti, S., and O. G. de
Dios, "A YANG Data Model for Optical Transport Network
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Topology", Work in Progress, Internet-Draft, draft-ietf-
ccamp-otn-topo-yang-17, 10 July 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
otn-topo-yang-17>.
[I-D.ietf-teas-actn-poi-applicability]
Peruzzini, F., Bouquier, J., Busi, I., King, D., and D.
Ceccarelli, "Applicability of Abstraction and Control of
Traffic Engineered Networks (ACTN) to Packet Optical
Integration (POI)", Work in Progress, Internet-Draft,
draft-ietf-teas-actn-poi-applicability-09, 7 July 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
actn-poi-applicability-09>.
Appendix A. Change Log
The initial YANG data model requesting path computation in optical
networks was draft-gbb-ccamp-optical-path-computation-yang-00. This
document included path computation request capabilities for WSON,
Flexi-Grid and OTN technologies. However, it was proposed at IETF
113 (March 25, 2022) to split the initial document into separate
documents for WDM (WSON and Flexi-Grid) and OTN technologies, as each
technology may be developed and implemented separately.
The WDM technology capabilities were kept in
[I-D.draft-gbb-ccamp-optical-path-computation-yang], and the OTN
capabilities were moved into this document.
Editors note, please remove this appendix before publication.
Acknowledgments
The authors of this document would like to thank the authors of
[I-D.ietf-teas-actn-poi-applicability] for having identified the gap
and requirements to trigger this work.
This document was prepared using kramdown.
Contributors
Daniel King
Old Dog Consulting
Email: daniel@olddog.co.uk
Authors' Addresses
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Italo Busi
Huawei Technologies
Email: italo.busi@huawei.com
Aihua Guo
Futurewei Technologies
Email: aihuaguo.ietf@gmail.com
Sergio Belotti
Nokia
Email: sergio.belotti@nokia.com
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