A YANG Data Model for Layer 0 Types Huawei TechnologiesH1, Huawei Xiliu Beipo Village, Songshan LakeDongguanGuangdong523808Chinazhenghaomian@huawei.comSamsungSouth Koreayounglee.tx@gmail.comFutureweiaihuaguo.ietf@gmail.comTelefonicavictor.lopezalvarez@telefonica.comUniversity of Lancasterd.king@lancaster.ac.ukCCAMP Working Group
This document defines a collection of common data types and groupings in the YANG data modeling language. These derived common types and groupings are intended to be imported by modules that model Layer 0 optical Traffic Engineering (TE) configuration and state capabilities such as Wavelength Switched Optical Networks (WSONs) and Flexi-grid Dense Wavelength Division Multiplexing (DWDM) Networks.
YANG is a data modeling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols such as NETCONF . The YANG language supports a small set of built-in data types and provides mechanisms to derive other types from the built-in types.
This document introduces a collection of common data types derived from the built-in YANG data types. The derived types and groupings are designed to be the common types applicable for modeling Traffic Engineering (TE) features as well as non-TE features (e.g., physical network configuration aspect) for Layer 0 optical networks in model(s) defined outside of this document. The applicability of Layer 0 types specified in this document include Wavelength Switched Optical Networks (WSONs) and , and Flexi-grid Dense Wavelength Division Multiplexing (DWDM) Networks and .
Refer to and for the key terms used in this document, and the terminology for describing YANG data models can be found in .
The YANG data model in this document conforms to the Network Management Datastore Architecture defined in .
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.
Note: The RFC Editor will replace XXXX with the number assigned to the RFC once this document becomes an RFC.
YANG module ietf-layer0-types (defined in Section 3) references , , and .
This document defines YANG module for common Layer 0 types, ietf-layer0-types. This module is used for WSON and Flexi-grid DWDM networks. The ietf-layer0-types module contains the following YANG reusable types and groupings:
l0-grid-type:
A base YANG identity for the grid type as defined in and .
dwdm-ch-spc-type:
A base YANG identity for the DWDM channel spacing type as defined in .
cwdm-ch-spc-type:
A base YANG identity for the CWDM channel spacing type as defined in .
wson-label-start-end:
A YANG grouping that defines the label-start or label-end to specify WSON label range as defined in .
wson-label-hop:
A YANG grouping that defines the label hop for WSON as defined in .
l0-label-range-info:
A YANG grouping that defines the layer 0 label range information applicable for both WSON per priority level as defined in . This grouping is used in the flexi-grid DWDM by adding more flexi-grid-specific parameters.
wson-label-step:
A YANG grouping that defines label steps for WSON as defined in .
flexi-grid-label-start-end:
A YANG grouping that defines the label-start or label-end to specify flexi-grid label range as defined in .
flexi-grid-label-hop:
A YANG grouping that defines the label hop for both single channel and multiple carriers in flexi-grid DWDM, as defined in .
flexi-grid-label-range-info:
A YANG grouping that defines flexi-grid label range information and per priority level as defined in and .
flexi-grid-label-step:
A YANG grouping that defines flexi-grid label steps as defined in .
file "ietf-layer0-types@2020-10-16.yang"
module ietf-layer0-types {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-layer0-types";
prefix "l0-types";
organization
"IETF CCAMP Working Group";
contact
"WG Web:
WG List:
Editor: Haomian Zheng
Editor: Young Lee
Editor: Aihua Guo
Editor: Victor Lopez
Editor: Daniel King
";
description
"This module defines Optical Layer 0 types. This module
provides groupings that can be applicable to Layer 0
Fixed Optical Networks (e.g., CWDM (Coarse Wavelength
Division Multiplexing) and DWDM (Dense Wavelength Division
Multiplexing)) and Flexi-grid Optical Networks.
Copyright (c) 2020 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with
or without modification, is permitted pursuant to, and
subject to the license terms contained in, the Simplified
BSD License set forth in Section 4.c of the IETF Trust's
Legal Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX; see
the RFC itself for full legal notices.";
revision "2020-10-16" {
description
"Initial Version";
reference
"RFC XXXX: A YANG Data Model for Layer 0 Types";
}
typedef dwdm-n {
type int16;
description
"The given value 'N' is used to determine the nominal
central frequency.
The nominal central frequency, 'f' is defined by:
f = 193100.000 GHz + N x channel-spacing (measured in GHz)
where 193100.000 GHz (193.100000 THz) is the ITU-T 'anchor
frequency' for transmission over the C band; and
where 'channel-spacing' is defined by the dwdm-ch-spc-type.";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers,
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
typedef cwdm-n {
type int16;
description
"The given value 'N' is used to determine the nominal
central wavelength.
The nominal central wavelength is defined by:
Wavelength = 1471 nm + N x channel-spacing (measured in nm)
where 1471 nm is the ITU-T 'anchor wavelength' for
transmission over the C band; and
where 'channel-spacing' is defined by the cwdm-ch-spc-type.";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers,
ITU-T G.694.2 (12/2003): Spectral grids for WDM applications:
CWDM wavelength grid";
}
typedef flexi-n {
type int16;
description
"The given value 'N' is used to determine the nominal
central frequency.
The nominal central frequency, 'f' is defined by,
f = 193100.000 GHz + N x channel-spacing (measured in GHz),
where 193100.000 GHz (193.100000 THz) is the ITU-T 'anchor
frequency' for transmission over the C band; and
where 'channel-spacing' is defined by the flexi-ch-spc-type.
Note that the term 'channel-spacing' can be alternated by the
term 'nominal central frequency granularity' defined in
clause 7 of ITU-T G.694.1.";
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks.
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
typedef flexi-m {
type uint16;
description
"The given value 'M' is used to determine the slot width.
A slot width is defined by:
slot width = M x SWG (measured in GHz),
where SWG is defined by the flexi-slot-width-granularity.";
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks.
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
identity l0-grid-type {
description
"Layer 0 grid type";
reference
"RFC6163:Framework for GMPLS and Path Computation Element
(PCE) Control of Wavelength Switched Optical Networks (WSONs),
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid,
ITU-T G.694.2 (12/2003): Spectral grids for WDM applications:
CWDM wavelength grid";
}
identity flexi-grid-dwdm {
base l0-grid-type;
description
"Flexi-grid";
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks,
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
identity wson-grid-dwdm {
base l0-grid-type;
description
"DWDM grid";
reference
"RFC6163:Framework for GMPLS and Path Computation Element
(PCE) Control of Wavelength Switched Optical Networks (WSONs),
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
identity wson-grid-cwdm {
base l0-grid-type;
description
"CWDM grid";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers,
ITU-T G.694.2 (12/2003): Spectral grids for WDM applications:
CWDM wavelength grid";
}
identity dwdm-ch-spc-type {
description
"DWDM channel spacing type";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers,
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
identity dwdm-100ghz {
base dwdm-ch-spc-type;
description
"100GHz channel spacing";
}
identity dwdm-50ghz {
base dwdm-ch-spc-type;
description
"50GHz channel spacing";
}
identity dwdm-25ghz {
base dwdm-ch-spc-type;
description
"25GHz channel spacing";
}
identity dwdm-12p5ghz {
base dwdm-ch-spc-type;
description
"12.5GHz channel spacing";
}
identity flexi-ch-spc-type {
description
"Flexi-grid channel spacing type";
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks
ITU-T G.694.1 (02/2012): Spectral grids for WDM applications:
DWDM frequency grid";
}
identity flexi-ch-spc-6p25ghz {
base flexi-ch-spc-type;
description
"6.25GHz channel spacing";
}
identity flexi-slot-width-granularity {
description
"Flexi-grid slot width granularity";
}
identity flexi-swg-12p5ghz {
base flexi-slot-width-granularity;
description
"12.5GHz slot width granularity";
}
identity cwdm-ch-spc-type {
description
"CWDM channel spacing type";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers,
ITU-T G.694.2 (12/2003): Spectral grids for WDM applications:
CWDM wavelength grid";
}
identity cwdm-20nm {
base cwdm-ch-spc-type;
description
"20nm channel spacing";
}
/* Groupings. */
grouping wson-label-start-end {
description
"The WSON label-start or label-end used to
specify WSON label range.";
choice grid-type {
description
"Label for DWDM or CWDM grid";
case dwdm {
leaf dwdm-n {
when 'derived-from-or-self(../../../grid-type,
"wson-grid-dwdm")'
{
description
"Valid only when grid type is DWDM.";
}
type l0-types:dwdm-n;
description
"The central frequency of DWDM. ";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
}
case cwdm {
leaf cwdm-n {
when 'derived-from-or-self(../../../grid-type,
"wson-grid-cwdm")'
{
description
"Valid only when grid type is CWDM.";
}
type l0-types:cwdm-n;
description
"Channel wavelength computing input. ";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
}
}
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
grouping wson-label-hop {
description
"Generic label hop information for WSON";
choice grid-type {
description
"Label for DWDM or CWDM grid";
case dwdm {
choice single-or-super-channel {
description "single or super channel";
case single {
leaf dwdm-n {
type l0-types:dwdm-n;
description
"The given value 'N' is used to determine the
nominal central frequency.";
}
}
case super {
leaf-list subcarrier-dwdm-n {
type l0-types:dwdm-n;
description
"The given values 'N' are used to determine the
nominal central frequency for each subcarrier
channels.";
reference
"ITU-T Recommendation G.694.1: Spectral grids for
WDM applications: DWDM frequency grid";
}
}
}
}
case cwdm {
leaf cwdm-n {
type l0-types:cwdm-n;
description
"The given value 'N' is used to determine the nominal
central wavelength.";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
}
}
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
grouping l0-label-range-info {
description
"Information for layer 0 label range.";
leaf grid-type {
type identityref {
base l0-grid-type;
}
description "Grid type";
}
leaf priority {
type uint8;
description
"Priority in Interface Switching Capability
Descriptor (ISCD).";
reference
"RFC4203: OSPF Extensions in Support of Generalized
Multi-Protocol Label Switching (GMPLS).";
}
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
grouping wson-label-step {
description "Label step information for WSON";
choice l0-grid-type {
description
"Grid type: DWDM, CWDM, etc.";
case dwdm {
leaf wson-dwdm-channel-spacing {
when 'derived-from-or-self(../../grid-type,
"wson-grid-dwdm")'
{
description
"Valid only when grid type is DWDM.";
}
type identityref {
base dwdm-ch-spc-type;
}
description
"Label-step is the channel-spacing (GHz), e.g.,
100.000, 50.000, 25.000, or 12.500 GHz for DWDM";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
}
case cwdm {
leaf wson-cwdm-channel-spacing {
when 'derived-from-or-self(../../grid-type,
"wson-grid-cwdm")'
{
description
"Valid only when grid type is CWDM.";
}
type identityref {
base cwdm-ch-spc-type;
}
description
"Label-step is the channel-spacing (nm), i.e., 20 nm
for CWDM, which is the only value defined for CWDM";
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers";
}
}
}
reference
"RFC6205: Generalized Labels for
Lambda-Switch-Capable (LSC) Label Switching Routers
ITU-T G.694.2 (12/2003): Spectral grids for WDM applications:
CWDM wavelength grid";
}
grouping flexi-grid-label-start-end {
description
"The Flexi-grid label-start or label-end used to
specify Flexi-grid label range.";
leaf flexi-n {
type l0-types:flexi-n;
description
"The given value 'N' is used to determine the nominal
central frequency.";
}
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks";
}
grouping flexi-grid-frequency-slot {
description "Flexi-grid frequency slot grouping.";
uses flexi-grid-label-start-end;
leaf flexi-m {
type l0-types:flexi-m;
description
"The given value 'M' is used to determine the slot width.";
}
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks";
}
grouping flexi-grid-label-hop {
description
"Generic label hop information for Flexi-grid";
choice single-or-super-channel {
description "single or super channel";
case single {
uses flexi-grid-frequency-slot;
}
case super {
list subcarrier-flexi-n {
key flexi-n;
uses flexi-grid-frequency-slot;
description
"List of subcarrier channels for flexi-grid
super channel.";
}
}
}
reference
"RFC7698: Framework and Requirements for GMPLS-Based Control
of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM)
Networks";
}
grouping flexi-grid-label-range-info {
description
"Info of Flexi-grid-specific label range";
uses l0-label-range-info;
container flexi-grid {
description "flexi-grid definition";
leaf slot-width-granularity {
type identityref {
base flexi-slot-width-granularity;
}
default flexi-swg-12p5ghz;
description
"Minimum space between slot widths. Default is
12.500 GHz";
reference
"RFC7698: Framework and Requirements for GMPLS-Based
Control of Flexi-Grid Dense Wavelength Division
Multiplexing (DWDM) Networks";
}
leaf min-slot-width-factor {
type uint16 {
range "1..max";
}
default 1;
description
"Slot width range: two multipliers of the slot width ,
granularity, each indicating the minimal and maximal slot
width supported by a port, respectively.
Minimum slot width is calculated by:
Minimum slot width (GHz) =
min-slot-width-factor * slot-width-granularity.
Minimum slot width should be smaller than or equal to
Maximum slot width. ";
reference
"RFC8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid
Dense Wavelength Division Multiplexing (DWDM) Networks";
}
leaf max-slot-width-factor {
type uint16 {
range "1..max";
}
description
"Slot width range: two multipliers of the slot width ,
granularity, each indicating the minimal and maximal slot
width supported by a port, respectively.
Maximum slot width is calculated by:
Maximum slot width (GHz) =
max-slot-width-factor * slot-width-granularity
Maximum slot width should be bigger than or equal to
Minimum slot width. ";
reference
"RFC8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid
Dense Wavelength Division Multiplexing (DWDM) Networks";
}
}
}
grouping flexi-grid-label-step {
description "Label step information for flexi-grid";
leaf flexi-grid-channel-spacing {
type identityref {
base flexi-ch-spc-type;
}
default flexi-ch-spc-6p25ghz;
description
"Label-step is the nominal central frequency
granularity (GHz), e.g., 6.25 GHz";
reference
"RFC7699: Generalized Labels for the Flexi-Grid in
Lambda Switch Capable (LSC) Label Switching Routers";
}
leaf flexi-n-step {
type uint8;
description
"This attribute defines the multiplier for the supported
values of 'N'.
For example, given a grid with a nominal central frequency
granularity of 6.25 GHz, the granularity of the supported
values of the nominal central frequency could be 12.5 GHz.
In this case, the values of flexi-n should be even and this
constraints is reported by setting the flexi-n-step to 2.
This attribute is also known as central frequency
granularity in RFC8363.";
reference
"RFC8363: GMPLS OSPF-TE Extensions in Support of Flexi-Grid
Dense Wavelength Division Multiplexing (DWDM) Networks";
}
}
}
]]>
The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF or RESTCONF . The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) . The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS .
The NETCONF access control model provides the means to restrict access for particular NETCONF users to a preconfigured subset of all available NETCONF protocol operations and content. The NETCONF Protocol over Secure Shell (SSH) describes a method for invoking and running NETCONF within a Secure Shell (SSH) session as an SSH subsystem. The NETCONF access control model provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content.
The objects in this YANG module are common data types and groupings. No object in this module can be read or written to. These definitions can be imported and used by other layer 0 specific modules. It is critical consider how imported definitions will be utilized and accessible via RPC operations, as the resultant schema will have data nodes that can be writable, or readable, and will have a significant effect on the network operations if used incorrectly or maliciously. All of this consideration belongs in the document that defines the modules that import from this YANG module. Therefore, it is important to manage access to resultant data nodes that are considered sensitive or vulnerable in some network environments.
The security considerations spelled out in the YANG 1.1 specification apply for this document as well.
It is proposed to IANA to assign new URIs from the "IETF XML Registry" as follows:
This document registers following YANG modules in the YANG Module Names registry .
The authors and the working group give their sincere thanks for Robert Wilton for the YANG doctor review, and Tom Petch for his comments during the model and document development.
Dhruv Dhody
Huawei
Email: dhruv.ietf@gmail.com
Bin Yeong Yoon
ETRI
Email: byyun@etri.re.kr
Ricard Vilalta
CTTC
Email: ricard.vilalta@cttc.es
Italo Busi
Huawei
Email: Italo.Busi@huawei.com
Spectral grids for WDM applications: DWDM frequency grid
International Telecommunication Union
Spectral grids for WDM applications: CWDM wavelength grid
International Telecommunication Union
Amplified multichannel dense wavelength division multiplexing applications with single channel optical interfaces
International Telecommunication Union
Interfaces for the optical transport network
International Telecommunication Union