CCAMP Working Group Y. Lee
Internet Draft H. Zheng
Intended Status: Standard Track I. Busi
Huawei
Expires: August 27, 2019
N. Sambo
Scuola Superiore Sant'Anna
V. Lopez
Telefonica
G. Galimberti
G. Martinelli
Cisco
Jean Luc Auge
Ester LE Rouzic
Julien Meuric
Orange
D. Beller
S. Belotti
E. Griseri
Nokia
Gert Grammel
Juniper
February 28, 2019
A Yang Data Model for Optical Impairment-aware Topology
draft-lee-ccamp-optical-impairment-topology-yang-01
Abstract
In order to provision an optical connection through optical
networks, a combination of path continuity, resource availability,
and impairment constraints must be met to determine viable and
optimal paths through the network. The determination of appropriate
paths is known as Impairment-Aware Routing and Wavelength Assignment
(IA-RWA) for WSON, while it is known as Impairment-Aware Routing and
Spectrum Assigment (IA-RSA) for SSON.
This document provides a YANG data model for the impairment-aware TE
topology in optical networks.
Lee, et al. Expires August 2019 [Page 1]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
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."
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html
This Internet-Draft will expire on August 27, 2019.
Copyright Notice
Copyright (c) 2019 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
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this
document must include Simplified BSD License text as described in
Section 4.e of the Trust Legal Provisions and are provided without
warranty as described in the Simplified BSD License.
Table of Contents
Lee, et al. Expires August 2019 [Page 2]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
1. Introduction...................................................3
1.1. Terminology...............................................4
1.2. Tree diagram..............................................4
1.3. Prefixes in Data Node Names...............................5
2. Reference Architecture.........................................6
2.1. Control Plane Architecture................................6
2.2. Transport Data Plane......................................7
2.3. OMS Media Links...........................................7
2.3.1. Optical Tributary Signal Group (OTSiG)...............8
2.4. Amplifiers................................................9
2.4.1. In-Line Amplifier...................................10
2.5. Transponders.............................................10
2.6. WSS/Filter...............................................10
2.7. Optical Fiber............................................10
3. YANG Model (Tree Structure)...................................11
4. Optical Impairment Topology YANG Model........................12
5. Security Considerations.......................................31
6. IANA Considerations...........................................31
7. Acknowledgments...............................................32
8. References....................................................33
8.1. Normative References.....................................33
8.2. Informative References...................................33
9. Contributors..................................................34
Authors' Addresses...............................................34
1. Introduction
In order to provision an optical connection (an optical path)
through a wavelength switched optical networks (WSONs) or spectrum
switched optical networks (SSONs), a combination of path continuity,
resource availability, and impairment constraints must be met to
determine viable and optimal paths through the network. The
determination of appropriate paths is known as Impairment-Aware
Routing and Wavelength Assignment (IA-RWA) [RFC6566] for WSON, while
it is known as IA-Routing and Spectrum Assigment (IA-RSA) for SSON.
This document provides a YANG data model for the impairment-aware
Traffic Engineering (TE) topology in WSONs and SSONs. The YANG model
described in this document is a WSON/SSON technology-specific Yang
model based on the information model developed in [RFC7446] and the
two encoding documents [RFC7581] and [RFC7579] that developed
protocol independent encodings based on [RFC7446].
The intent of this document is to provide a Yang data model, which
can be utilized by a Multi-Domain Service Coordinator (MDSC) to
collect states of WSON impairment data from the Transport PNCs to
enable impairment-aware optical path computation according to the
Lee, et al. Expires August 2019 [Page 3]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
ACTN Architecture [RFC8453]. The communication between controllers
is done via a NETCONF [RFC8341]. Similarly, this model can also be
exported by the MDSC to a Customer Network Controller (CNC), which
can run an offline planning process to map latter the services in
the network.
This document augments the generic TE topology draft [TE-TOPO] where
possible.
This document defines one YANG module: ietf-optical-impairment-
topology (Section 3) according to the new Network Management
Datastore Architecture [RFC8342].
1.1. Terminology
Refer to [RFC4847] and [RFC5253] for the key terms used in this
document.
The following terms are defined in [RFC7950] and are not redefined
here:
o client
o server
o augment
o data model
o data node
The following terms are defined in [RFC6241] and are not redefined
here:
o configuration data
o 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 2 of this this document. The meaning of the symbols in
these diagrams is defined in [RFC8340].
Lee, et al. Expires August 2019 [Page 4]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
1.3. Prefixes 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.
+------------------+----------------------------------+------------+
| Prefix | YANG module | Reference |
+------------------+----------------------------------+------------+
| optical-imp-topo | ietf-optical-impairment-topology | [RFC XXXX] |
| layer0-types | ietf-layer0-types | [WSON-topo]|
| nw | ietf-network | [RFC8345] |
| nt | ietf-network-topology | [RFC8345] |
| tet | ietf-te-topology | [TE-TOPO] |
+------------------+----------------------------------+------------+
Table 1: Prefixes and corresponding YANG modules
Note: The RFC Editor will replace XXXX with the number assigned to
the RFC once this draft becomes an RFC.
Lee, et al. Expires August 2019 [Page 5]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
2. Reference Architecture
2.1. Control Plane Architecture
Figure 1 shows the control plane architecture.
Figure 1. Control Plane Architecture
The models developed in this document is an abstracted Yang model
that may be used in the interfaces colored in yellow in Figure 1. It
is not intended to support detailed device congiuration model.
Device configuration model is supported by the models presented in
[draft-ietf-ccamp-dwdm-if-parameter-yang].
Lee, et al. Expires August 2019 [Page 6]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
2.2. Transport Data Plane
This section provides the description of the reference optical
network architecture and its relevant components to support optical
impairment-aware path computation.
Figure 2 shows the reference architecture.
+-------------------+ +-------------------+
| ROADM Node | | ROADM Node |
| | | |
| PA +-------+ BA | ILA ILA | PA +-------+ BA |
| +-+ | WSS/ | +-+ | _____ +--+ ____ +--+ _____ | +-+ | WSS/ | +-+ |
---|-| |-|Filter |-| |-|-()____)--| |-()___)-| |-()____)--|-| |-|Filter |-| |-|---
| +-+ | | +-+ | +--+ +--+ | +-+ | | +-+ |
| +-------+ | optical | +-------+ |
| | | | | fiber | | | | |
| | | | | | | | | |
| o-o-o | | o-o-o |
| transponders | | transponders |
+-------------------+ +-------------------+
OTS Link OTS Link OTS Link
-----------> --------> ----------->
OMS Link
---------------------------------------------->
PA: Pre-Amplifier
BA: Booster Amplifier
ILA: In-Line Amplifier
Figure 2. Reference Architecture for Optical Transport Network
BA (on the left side ROADM) is the ingress Amplifier and PA (on the
right side ROADM is the egress amplifier for the OMS link shown in
the Figure.
2.3. OMS Media Links
According to [G.872], OMS Media Link represents a media link between
two ROADM. Specifically, it originates at the ROADM's Filter in the
source ROADM and terminates at the ROADM's Filter in the destination
ROADM.
OTS Media Link represents a media link:
Lee, et al. Expires August 2019 [Page 7]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
(i) between ROADM's BA and ILA;
(ii) between a pair of ILAs;
(iii) between ILA and ROADM's PA.
OMS Media link can be decomposed of a number of elements, which are
basically OTS links type (i), (ii), and (iii) as discussed above.
OMS Media link would give an abstracted view of impairment data
(e.g., power, OSNR, etc.) to the network controller.
2.3.1. Optical Tributary Signal Group (OTSiG)
The Media Channel and Network Media Channel are well modelled by the
RFC7698, RFC7699 and RFC7792 reflecting the ITU-T Recommendations
G.694.1 and G.698.2.
Some work is in progress in ITU-T SG15/Q12 to define Network Media
Channel (group) that is capable of accommodating the optical
tributary signals (OTSi) belonging to optical tributary signal group
(OTSiG). ( see new ITU-T Draft Recommendation G.807)).
Currently, no models exist (in the IETF nor ITU-T SG15) that define
how the optical tributary signals are described inside the Network
Media Channel Group in terms of OTSi identifier, OTSi carrier
frequency and OTSi signal width.
There are several options how the mentioned parameters can be
described. One option is to use the description defined in draft-
ggalimbe-ccamp-flexigrid-carrier-label.
A second option is to describe the OTsi carrier frequency relative
to the anchor frequency 193.1THz based on a well-defined granularity
(e.g. OTSi carrier frequency = 193100 (GHz) + K * granularity (GHz)
where K is a signed integer value).
A third option is to explicitly describe the OTSi carrier frequency
and the OTSi signal width in GHz with a certain accuracy.
It is proposed to use the third option which is independent of the
n, m values alredy define in ITU-T Recommendation G.694.1.
The OTSi carrier frequency is described in GHz with 3 fractional
digits (decimal 64 fraction digits 3).
Lee, et al. Expires August 2019 [Page 8]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
The OTSi signal width is described in GHz with 3 fractional digits
(decimal 64 fraction digits 3) and includes the signal roll off as
well as some guard band.
The accuracy of 0.001 GHz does not impose a requirement on the
optical transceiver components (optical transmitter) in terms of
carrier frequency tuneability precision. Today's components
typically provide a tunability precision in the range of 1..1.5GHz
(carrier frequency offset compared to the configured nominal carrier
frequency). Future components may provide a better precision as
technology evolves.
If needed, a controller may retrieve the transceiver properties in
terms of carrier frequency tuneability precision in order to be
capable of properly configuring the underlying transceiver.
[Note from the Editor]:
As this description is arbitrarily proposed by the authors to cover
a lack of information in IETF and ITU-T, a liaison request to ITU-T
is needed.
The authors are willing to contribute to Liaison editing and to
consider any feedback and proposal from ITU-T.
2.4. Amplifiers
There are three basic types of amplifiers. ILA is In-Line Amplifier
which is a separate node type while Pre-Amplifier and Booster
Amplifier are integral elements of ROADM node. From a data modeling
perspective, Pre-Amplifier and Booster Amplifier are internal
functions of a ROADM node and as such these elements are hidden
within ROADM node. In this document, we would avoid internal node
details, but attempt to abstract as much as possible.
One modeling consideration of the ROADM internal is to model power
parameter through the ROADM, factoring the output power from the
Pre-Amplifier minus the ROADM power loss would give the input power
to the Booster Amplifier. In other words, Power_in (@ ROADM Booster)
Lee, et al. Expires August 2019 [Page 9]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
= Power_out (@ ROADM Pre-Amplifier) - Power_loss (@ ROADM
WSS/Filter).
2.4.1. In-Line Amplifier
(Need to explain details including VOA)
2.5. Transponders
A Transponder is the element that sends and receives the optical
signal from a fiber. A transponder is typically characterized by its
data rate and the maximum distance the signal can travel. Channel
frequency, per channel input power, FEC and Modulation are also
associated with a transponder. From a path computation point of
view, the selection of the compatible source and destination
transponders is an important factor for optical signal to traverse
through the fiber. There are three main approaches to determine
optical signal compatibility. Application Code based on G.682.2 is
one approach that only checks the code at both ends of the
interface. Another approach is organization codes that are specific
to an organization or a vendor. The third approach is specify all
the relevant parameters explicitly, e.g., FEC type, Modulation type,
etc.
2.6. WSS/Filter
WSS separates the incoming light input spectrally as well as
spatially, then chooses the wavelength that is of interest by
deflecting it from the original optical path and then couple it to
another optical fibre port. WSS/Filter is internal to ROADM. So this
document does not model the inside of ROADM.
2.7. Optical Fiber
There are various optical fiber types defined by ITU-T. There are
several fiber-level parameters that need to be factored in, such as,
fiber-type, length, loss coefficient, pmd, connectors (in/out).
ITU-T G.652 defines Standard Singlemode Fiber; G.654 Cutoff Shifted
Fiber; G.655 Non-Zero Dispersion Shifted Fiber; G.656 Non-Zero
Dispersion for Wideband Optical Transport; G.657 Bend-Insensitive
Fiber. There may be other fiber-types that need to be considered.
Lee, et al. Expires August 2019 [Page 10]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
3. YANG Model (Tree Structure)
module: ietf-optical-impairment-topology
augment /nw:networks/nw:network/nw:network-types/tet:te-topology:
+--rw optical-impairment-topology!
augment /nw:networks/nw:network/nt:link/tet:te/tet:te-link-attributes:
+--ro OMS-attributes
+--ro generalized-snr? decimal64
+--ro equalization-mode identityref
+--ro (power-param)?
| +--:(channel-power)
| | +--ro nominal-channel-power? decimal64
| +--:(power-spectral-density)
| +--ro nominal-power-spectral-density? decimal64
+--ro network-media-channel-group* [i]
| +--ro i int16
| +--ro current-channels* [flex-n]
| | +--ro flex-n uint16
| | +--ro flex-m? uint16
| +--ro OTSiG-container* [carrier-id]
| +--ro carrier-id int16
| +--ro OTSi-carrier-frequency? decimal64
| +--ro OTSi-signal-width? decimal64
| +--ro channel-delta-power? decimal64
+--ro OMS-elements* [elt-index]
+--ro elt-index uint16
+--ro uid? string
+--ro type identityref
+--ro element
+--ro (element)?
+--:(amplifier)
| +--ro amplifier
| +--ro type_variety string
| +--ro operational
| +--ro actual-gain decimal64
| +--ro tilt-target decimal64
| +--ro out-voa decimal64
| +--ro in-voa decimal64
| +--ro (power-param)?
| +--:(channel-power)
| | +--ro nominal-channel-power? decimal64
| +--:(power-spectral-density)
| +--ro nominal-power-spectral-density? decimal64
+--:(fiber)
| +--ro fiber
Lee, et al. Expires August 2019 [Page 11]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
| +--ro type_variety string
| +--ro length decimal64
| +--ro loss_coef decimal64
| +--ro total_loss decimal64
| +--ro pmd? decimal64
| +--ro conn_in? decimal64
| +--ro conn_out? decimal64
+--:(concentratedloss)
+--ro concentratedloss
+--ro loss? decimal64
augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-point:
+--ro transponders-list* [transponder-id]
+--ro transponder-id uint32
+--ro (mode)?
| +--:(G.692.2)
| | +--ro G.692.2? layer0-types:standard-mode
| +--:(organizational_mode)
| | +--ro operational-mode? layer0-types:operational-mode
| | +--ro organization-identifier? layer0-types:vendor-identifier
| +--:(explicit_mode)
| +--ro available-modulation* identityref
| +--ro modulation-type? identityref
| +--ro available-baud-rates* uint32
| +--ro configured-baud-rate? uint32
| +--ro available-FEC* identityref
| +--ro FEC-type? identityref
| +--ro FEC-code-rate? decimal64
| +--ro FEC-threshold? decimal64
+--ro power? int32
+--ro power-min? int32
+--ro power-max? int32
augment /nw:networks/nw:network/nw:node/tet:te/tet:tunnel-termination-point:
+--ro transponder-list* [carrier-id]
+--ro carrier-id uint32
4. Optical Impairment Topology YANG Model
<CODE BEGINS> file ietf-optical-impairment-topology@2018-02-27.yang
module ietf-optical-impairment-topology {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-optical-impairment-topology";
prefix "optical-imp-topo";
Lee, et al. Expires August 2019 [Page 12]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
import ietf-network {
prefix "nw";
}
import ietf-network-topology {
prefix "nt";
}
import ietf-te-topology {
prefix "tet";
}
import ietf-layer0-types {
prefix "layer0-types";
}
organization
"IETF CCAMP Working Group";
contact
"Editor: Young Lee <leeyoung@huawei.com>
Editor: Haomian Zheng <zhenghaomian@huawei.com>
Editor: Nicola Sambo <nicosambo@gmail.com>
Editor: Victor Lopez <victor.lopezalvarez@telefonica.com>
Editor: Gabriele Galimberti <ggalimbe@cisco.com>
Editor: Auge Jean-Luc <jeanluc.auge@orange.com>
Editor: Le Rouzic Esther <esther.lerouzic@orange.com>
Editor: Julien Meuric <julien.meuric@orange.com>
Editor: Italo Busi <Italo.Busi@huawei.com>";
description
"This module contains a collection of YANG definitions for
impairment-aware optical networks.
Copyright (c) 2019 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD
License set forth in Section 4.c of the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).";
revision 2019-02-27 {
description
"Initial Version";
reference
Lee, et al. Expires August 2019 [Page 13]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
"RFC XXXX: A Yang Data Model for Impairment-aware
Optical Networks";
}
identity modulation {
description "base identity for modulation type";
}
identity QPSK {
base modulation;
description
"QPSK (Quadrature Phase Shift Keying) modulation";
}
identity DP_QPSK {
base modulation;
description
"DP-QPSK (Dual Polarization Quadrature
Phase Shift Keying) modulation";
}
identity QAM8 {
base modulation;
description
"8QAM (8-State Quadrature Amplitude Modulation) modulation";
}
identity QAM16 {
base modulation;
description
"QAM16 (Quadrature Amplitude Modulation)";
}
identity DP_QAM8 {
base modulation;
description
"DP-QAM8 (Dual Polarization Quadrature Amplitude Modulation)";
}
identity DC_DP_QAM8 {
base modulation;
description
"DC DP-QAM8 (Dual Polarization Quadrature Amplitude Modulation)";
}
identity DP_QAM16 {
base modulation;
description
"DP-QAM16 (Dual Polarization Quadrature Amplitude Modulation)";
}
identity DC_DP_QAM16 {
base modulation;
description
"DC DP-QAM16 (Dual Polarization Quadrature Amplitude Modulation)";
Lee, et al. Expires August 2019 [Page 14]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
}
identity FEC {
description
"Enumeration that defines the type of
Forward Error Correction";
}
identity reed-solomon {
base FEC;
description
"Reed-Solomon error correction";
}
identity hamming-code {
base FEC;
description
"Hamming Code error correction";
}
identity golay {
base FEC;
description "Golay error correction";
}
typedef fiber-type {
type enumeration {
enum G.652 {
description "G.652 Standard Singlemode Fiber";
}
enum G.654 {
description "G.654 Cutoff Shifted Fiber";
}
enum G.653 {
description "G.653 Dispersion Shifted Fiber";
}
enum G.655 {
description "G.655 Non-Zero Dispersion Shifted Fiber";
}
enum G.656 {
description "G.656 Non-Zero Dispersion for Wideband
Optical Transport";
}
enum G.657 {
description "G.657 Bend-Insensitive Fiber";
}
}
description
"ITU-T based fiber-types";
}
Lee, et al. Expires August 2019 [Page 15]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
grouping transponder-attributes {
description "Configuration of an optical transponder";
leaf-list available-modulation {
type identityref {
base modulation;
}
config false;
description
"List determining all the available modulations";
}
leaf modulation-type {
type identityref {
base modulation;
}
config false;
description
"Modulation configured for the transponder";
}
leaf-list available-baud-rates {
type uint32;
units Bd;
config false;
description
"list of available baud-rates. Baud-rate is the unit for
symbol rate or modulation rate in symbols per second or
pulses per second. It is the number of distinct symbol
changes (signaling events) made to the transmission medium
per second in a digitally modulated signal or a line code";
}
leaf configured-baud-rate {
type uint32;
units Bd;
config false;
description "configured baud-rate";
}
leaf-list available-FEC {
type identityref {
base FEC;
}
config false;
description "List determining all the available FEC";
}
leaf FEC-type {
Lee, et al. Expires August 2019 [Page 16]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
type identityref {
base FEC;
}
config false;
description
"FEC type configured for the transponder";
}
leaf FEC-code-rate {
type decimal64 {
fraction-digits 8;
range "0..max";
}
config false;
description "FEC-code-rate";
}
leaf FEC-threshold {
type decimal64 {
fraction-digits 8;
range "0..max";
}
config false;
description
"Threshold on the BER, for which FEC is able to correct errors";
}
}
grouping sliceable-transponder-attributes {
description
"Configuration of a sliceable transponder.";
list transponder-list {
key "carrier-id";
config false;
description "List of carriers";
leaf carrier-id {
type uint32;
config false;
description "Identifier of the carrier";
}
}
}
grouping optical-fiber-data {
description
"optical link (fiber) attributes with impairment data";
leaf fiber-type {
type fiber-type;
Lee, et al. Expires August 2019 [Page 17]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
config false;
description "fiber-type";
}
leaf span-length {
type decimal64 {
fraction-digits 2;
}
units "km";
config false;
description "the lenght of the fiber span in km";
}
leaf input-power {
type decimal64 {
fraction-digits 2;
}
units "dBm";
config false;
description
"Average input power level estimated at the receiver
of the link";
}
leaf output-power {
type decimal64 {
fraction-digits 2;
}
units "dBm";
description
"Mean launched power at the transmitter of the link";
}
leaf pmd {
type decimal64 {
fraction-digits 8;
range "0..max";
}
units "ps/(km)^0.5";
config false;
description
"Polarization Mode Dispersion";
}
leaf cd {
type decimal64 {
fraction-digits 5;
}
units "ps/nm/km";
Lee, et al. Expires August 2019 [Page 18]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
config false;
description
"Cromatic Dispersion";
}
leaf osnr {
type decimal64 {
fraction-digits 5;
}
units "dB";
config false;
description
"Optical Signal-to-Noise Ratio (OSNR) estimated
at the receiver";
}
leaf sigma {
type decimal64 {
fraction-digits 5;
}
units "dB";
config false;
description
"sigma in the Gausian Noise Model";
}
}
grouping optical-channel-data {
description
"optical impairment data per channel/wavelength";
leaf bit-rate {
type decimal64 {
fraction-digits 8;
range "0..max";
}
units "Gbit/s";
config false;
description
"Gross bit rate";
}
leaf BER {
type decimal64 {
fraction-digits 18;
range "0..max";
}
config false;
description
"BER (Bit Error Rate)";
Lee, et al. Expires August 2019 [Page 19]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
}
leaf ch-input-power {
type decimal64 {
fraction-digits 2;
}
units "dBm";
config false;
description
"Per channel average input power level
estimated at the receiver of the link";
}
leaf ch-pmd {
type decimal64 {
fraction-digits 8;
range "0..max";
}
units "ps/(km)^0.5";
config false;
description
"per channel Polarization Mode Dispersion";
}
leaf ch-cd {
type decimal64 {
fraction-digits 5;
}
units "ps/nm/km";
config false;
description
"per channel Cromatic Dispersion";
}
leaf ch-osnr {
type decimal64 {
fraction-digits 5;
}
units "dB";
config false;
description
"per channel Optical Signal-to-Noise Ratio
(OSNR) estimated at the receiver";
}
leaf q-factor {
type decimal64 {
fraction-digits 5;
}
Lee, et al. Expires August 2019 [Page 20]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
units "dB";
config false;
description
"q-factor estimated at the receiver";
}
}
grouping standard_mode {
description
"ITU-T G.698.2 standard mode that guarantees interoperability.
It must be an string with the following format:
B-DScW-ytz(v) where all these attributes are conformant
to the ITU-T recomendation";
leaf standard_mode {
type layer0-types:standard-mode;
config false;
description
"G.698.2 standard mode";
}
}
grouping organizational_mode {
description
"Transponder operational mode supported by organizations or
vendor";
leaf operational-mode {
type layer0-types:operational-mode;
config false;
description
"configured organization- or vendor-specific
application identifiers (AI) supported by the transponder";
}
leaf organization-identifier {
type layer0-types:vendor-identifier;
config false;
description
"organization identifier that uses organizational
mode";
}
}
/*
* Identities
*/
identity type-element {
Lee, et al. Expires August 2019 [Page 21]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
description
"Base identity for element type";
}
identity Fiber {
base type-element;
description
"Fiber element";
}
identity Roadm {
base type-element;
description
"Roadm element";
}
identity Edfa {
base type-element;
description
"Edfa element";
}
identity Concentratedloss {
base type-element;
description
"Concentratedloss element";
}
identity type-power-mode {
description
"power equalization mode used within the OMS and its elements";
}
identity power-spectral-density {
base type-power-mode;
description
"all elements must use power spectral density (W/Hz)";
}
identity channel-power {
base type-power-mode;
description
"all elements must use power (dBm)";
}
/*
* Groupings
*/
grouping amplifier-params {
Lee, et al. Expires August 2019 [Page 22]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
description "describes parameters for an amplifier";
container amplifier{
description "amplifier type, operatonal parameters are described";
leaf type_variety {
type string ;
mandatory true ;
description
"String identifier of amplifier type referencing
a specification in a separate equipment catalog";
}
container operational {
description "amplifier operationnal parameters";
leaf actual-gain {
type decimal64 {
fraction-digits 2;
}
units dB ;
mandatory true ;
description "..";
}
leaf tilt-target {
type decimal64 {
fraction-digits 2;
}
mandatory true ;
description "..";
}
leaf out-voa {
type decimal64 {
fraction-digits 2;
}
units dB;
mandatory true;
description "..";
}
leaf in-voa {
type decimal64 {
fraction-digits 2;
}
units dB;
mandatory true;
description "..";
}
uses power-param;
}
}
}
grouping fiber-params {
Lee, et al. Expires August 2019 [Page 23]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
description "String identifier of fiber type referencing a specification in a
separate equipment catalog";
container fiber {
description "fiber characteristics";
leaf type_variety {
type string ;
mandatory true ;
description "fiber type";
}
leaf length {
type decimal64 {
fraction-digits 2;
}
units km;
mandatory true ;
description "length of fiber";
}
leaf loss_coef {
type decimal64 {
fraction-digits 2;
}
units dB/km;
mandatory true ;
description "loss coefficient of the fiber";
}
leaf total_loss {
type decimal64 {
fraction-digits 2;
}
units dB;
mandatory true ;
description
"includes all losses: fiber loss and conn_in and conn_out losses";
}
leaf pmd{
type decimal64 {
fraction-digits 2;
}
units sqrt(ps);
description "pmd of the fiber";
}
leaf conn_in{
type decimal64 {
fraction-digits 2;
}
units dB;
description "connector-in";
}
leaf conn_out{
Lee, et al. Expires August 2019 [Page 24]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
type decimal64 {
fraction-digits 2;
}
units dB;
description "connector-out";
}
}
}
grouping roadm-params{
description "roadm parameters description";
container roadm{
description "roadm parameters";
leaf type_variety {
type string ;
mandatory true ;
description "String identifier of roadm type referencing a specification in a
separate equipment catalog";
}
leaf loss {
type decimal64 {
fraction-digits 2;
}
units dB ;
description "..";
}
}
}
grouping concentratedloss-params{
description "concentrated loss";
container concentratedloss{
description "concentrated loss";
leaf loss {
type decimal64 {
fraction-digits 2;
}
units dB ;
description "..";
}
}
}
grouping power-param{
description
"optical power or PSD after the ROADM or after the out-voa";
choice power-param {
description
"select the mode: channel power or power spectral density";
Lee, et al. Expires August 2019 [Page 25]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
case channel-power {
/* when "../../equalization-mode='channel-power'"; */
leaf nominal-channel-power{
type decimal64 {
fraction-digits 1;
}
units dBm ;
description
" Reference channel power after the ROADM or after the out-voa. ";
}
}
case power-spectral-density{
/* when "../../equalization-mode='power-spectral-density'"; */
leaf nominal-power-spectral-density{
type decimal64 {
fraction-digits 16;
}
units W/Hz ;
description
" Reference power spectral density after the ROADM or after the out-voa.
Typical value : 3.9 E-14, resolution 0.1nW/MHz";
}
}
}
}
grouping oms-general-optical-params {
description "OMS link optical parameters";
leaf generalized-snr {
type decimal64 {
fraction-digits 5;
}
units "dB@0.1nm";
description "generalized snr";
}
leaf equalization-mode{
type identityref {
base type-power-mode;
}
mandatory true;
description "equalization mode";
}
uses power-param;
}
grouping network-media-channel-group {
description "network media channel group";
list network-media-channel-group {
key "i";
Lee, et al. Expires August 2019 [Page 26]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
description
"list of network media channel group's member";
leaf i {
type int16;
description "index of network media channel group member";
}
list current-channels {
key "flex-n";
description
"list of media channels in the OMS";
uses layer0-types:flex-grid-channel;
}
list OTSiG-container {
key "carrier-id";
description
"list of OTSi under OTSi-G";
leaf carrier-id {
type int16;
description "carrier-id under OTSi-G";
}
leaf OTSi-carrier-frequency {
type decimal64 {
fraction-digits 3;
}
units GHz;
config false;
description
"OTSi carrier frequency";
}
leaf OTSi-signal-width {
type decimal64 {
fraction-digits 3;
}
units GHz;
config false;
description
"OTSi signal width";
}
leaf channel-delta-power {
type decimal64 {
fraction-digits 2;
}
units dB;
config false;
description
Lee, et al. Expires August 2019 [Page 27]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
"optional ; delta power to ref channel input-power applied to this
channel";
}
}
}
}
grouping oms-element {
description "OMS description";
list OMS-elements {
key "elt-index";
description
"defines the spans and the amplifier blocks of the amplified lines";
leaf elt-index {
type uint16;
description
"ordered list of Index of OMS element (whether it's a Fiber, an EDFA or a
Concentratedloss)";
}
leaf uid {
type string;
description
"unique id of the element if it exists";
}
leaf type {
type identityref {
base type-element;
}
mandatory true;
description "element type";
}
container element {
description "element of the list of elements of the OMS";
choice element {
description "OMS element type";
case amplifier {
/* when "../../type = 'Edfa'"; */
uses amplifier-params ;
}
case fiber {
/* when "../../type = 'Fiber'"; */
uses fiber-params ;
}
case concentratedloss {
/* when "../../type = 'Concentratedloss'"; */
uses concentratedloss-params ;
}
}
Lee, et al. Expires August 2019 [Page 28]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
}
}
}
/* Data nodes */
augment "/nw:networks/nw:network/nw:network-types"
+ "/tet:te-topology" {
description "optical-impairment topology augmented";
container optical-impairment-topology {
presence "indicates an impairment-aware topology of optical networks";
description
"Container to identify impairment-aware topology type";
}
}
augment "/nw:networks/nw:network/nt:link/tet:te"
+ "/tet:te-link-attributes" {
when "/nw:networks/nw:network/nw:network-types"
+"/tet:te-topology/optical-imp-topo:optical-impairment-topology" {
description
"This augment is only valid for Optical Impairment.";
}
description "Optical Link augmentation for impairment data.";
container OMS-attributes {
config false;
description "OMS attributes";
uses oms-general-optical-params;
uses network-media-channel-group;
uses oms-element;
}
}
augment "/nw:networks/nw:network/nw:node/tet:te"
+ "/tet:tunnel-termination-point" {
when "/nw:networks/nw:network/nw:network-types"
+"/tet:te-topology/optical-imp-topo:optical-impairment-topology" {
description
"This augment is only valid for Impairment with non-sliceable
transponder model";
}
description
"Tunnel termination point augmentation for non-sliceable
transponder model.";
list transponders-list {
key "transponder-id";
config false;
description "list of transponders";
leaf transponder-id {
Lee, et al. Expires August 2019 [Page 29]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
type uint32;
description "transponder identifier";
}
choice mode {
description "standard mode, organizational mode or explicit mode";
case G.692.2 {
uses standard_mode;
}
case organizational_mode {
uses organizational_mode;
}
case explicit_mode {
uses transponder-attributes;
}
}
leaf power {
type int32;
units "dBm";
config false;
description "per channel power";
}
leaf power-min {
type int32;
units "dBm";
config false;
description "minimum power of the transponder";
}
leaf power-max {
type int32;
units "dBm";
config false;
description "maximum power of the transponder";
}
}
}
augment "/nw:networks/nw:network/nw:node/tet:te"
+ "/tet:tunnel-termination-point" {
when "/nw:networks/nw:network/nw:network-types"
+"/tet:te-topology/optical-imp-topo:optical-impairment-topology" {
description
"This augment is only valid for optical impairment with sliceable
Lee, et al. Expires August 2019 [Page 30]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
transponder model";
}
description
"Tunnel termination point augmentation for sliceable transponder model.";
uses sliceable-transponder-attributes;
}
}
<CODE ENDS>
5. Security Considerations
The configuration, state, and action data defined in this document
are designed to be accessed via a management protocol with a secure
transport layer, such as NETCONF [RFC6241]. The NETCONF access
control model [RFC6536] provides the means to restrict access for
particular NETCONF users to a preconfigured subset of all available
NETCONF protocol operations and content.
A number of configuration data nodes defined in this document are
read-only; however, these data nodes may be considered sensitive or
vulnerable in some network environments (TBD).
6. IANA Considerations
This document registers the following namespace URIs in the IETF XML
registry [RFC3688]:
--------------------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-optical-impairment-topology
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
--------------------------------------------------------------------
This document registers the following YANG modules in the YANG
Module Names registry [RFC7950]:
--------------------------------------------------------------------
name: ietf-optical-impairment-topology
namespace: urn:ietf:params:xml:ns:yang:ietf-optical-impairment-
topology
Lee, et al. Expires August 2019 [Page 31]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
reference: RFC XXXX (TDB)
--------------------------------------------------------------------
7. Acknowledgments
We thank Dieter Bella and Sergio Belotti for useful discussions and
motivation for this work.
Lee, et al. Expires August 2019 [Page 32]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
8. References
8.1. Normative References
8.2. Informative References
[RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, June 2011.
[RFC6566] Y. Lee, G. Bernstein, D. Li, G. Martinelli, "A Framework
for the Control of Wavelength Switched Optical Networks
(WSONs) with Impairments", RFC 6566, March 2012.
[RFC7446] Y. Lee, G. Bernstein, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Model for Wavelength
Switched Optical Networks", RFC 7446, Feburary 2015.
[RFC7579] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "General
Network Element Constraint Encoding for GMPLS Controlled
Networks", RFC 7579, June 2015.
[RFC7581] G. Bernstein, Y. Lee, D. Li, W. Imajuku, "Routing and
Wavelength Assignment Information Encoding for Wavelength
Switched Optical Networks", RFC 7581, June 2015.
[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, August 2016.
[RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", RFC 8341, March 2018.
[RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
and R. Wilton, "Network Management Datastore Architecture
(NMDA)", RFC 8342, March 2018.
[RFC8345] A. Clemm, et al, "A YANG Data Model for Network
Topologies", RFC 8345, March 2018.
[TE-TOPO] X. Liu, et al., "YANG Data Model for TE Topologies", work
in progress: draft-ietf-teas-yang-te-topo.
Lee, et al. Expires August 2019 [Page 33]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
[RFC8453] Ceccarelli, D. and Y. Lee, "Framework for Abstraction and
Control of Traffic Engineered Networks", RFC 8453, August
2018.
[WSON-Topo] Y. Lee, Ed., "A Yang Data Model for WSON Optical
Networks", draft-ietf-ccamp-wson-yang-13, work in
progress.
9. Contributors
Jonas Martensson
Acro
Email: jonas.martensson@ri.se
Authors' Addresses
Young Lee
Huawei Technologies
Email: leeyoung@huawei.com
Haomian Zheng
Huawei Technologies
Email: zhenghaomian@huawei.com
Italo Busi
Huawei Technologies
Email: Italo.Busi@huawei.com
Nicola Sambo
Scuola Superiore Sant'Anna
Email: nicosambo@gmail.com
Victor Lopez
Telefonica
Email: victor.lopezalvarez@telefonica.com
Lee, et al. Expires August 2019 [Page 34]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
G. Galimberti
Cisco
Email: ggalimbe@cisco.com
Giovanni Martinelli
Cisco
Email: giomarti@cisco.com
AUGE Jean Luc
Orange
Email: jeanluc.auge@orange.com
LE ROUZIC Esther
Orange
Email: esther.lerouzic@orange.com
Julien Meuric
Orange
Email: julien.meuric@orange.com
Dieter Beller
Nokia
Email: dieter.beller@nokia.com
Sergio Belotti
Nokia
Email: Sergio.belotti@nokia.com
Griseri Enrico
Nokia
Email: enrico.griseri@nokia.com
Gert Grammel
Lee, et al. Expires August 2019 [Page 35]
Internet-Draft Optical Impairment-Aware YANG Model February 2019
Juniper
Email: ggrammel@juniper.net
Lee, et al. Expires August 2019 [Page 36]