CCAMP Working Group J.E. Lopez de Vergara
Internet Draft Universidad Autonoma de Madrid
Intended status: Standards Track V. Lopez
Expires: January 7, 2016 O. Gonzalez de Dios
Telefonica I+D/GCTO
D. King
Lancaster University
Y. Lee
Huawei
Z. Ali
Cisco Systems
July 6, 2015
YANG data model for Flexi-Grid Optical Networks
draft-vergara-ccamp-flexigrid-yang-01.txt
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Abstract
This document defines a YANG model for managing flexi-grid DWDM
Networks. The model described in this document is composed of two
submodels: one to define an flex-grid traffic engineering database,
and other one to describe the flex-grid paths or media channels.
Table of Contents
1. Introduction ...............................................2
2. Conventions used in this document ..........................3
3. Flex-grid network topology model overview ..................3
4. Main building blocks........................................5
4.1. Flex-grid TED .........................................5
4.2. Media-channel/network-media-channel ...................7
5. Example of use .............................................9
6. Formal Syntax ..............................................11
7. Security Considerations ....................................11
8. IANA Considerations ........................................11
9. References .................................................11
9.1. Normative References ..................................11
9.2. Informative References ................................12
10. Contributors ..............................................12
11. Acknowledgments ...........................................12
Appendix A. YANG models........................................12
A.1. Flex-grid TED YANG Model ..............................13
A.2. Media Channel YANG Model ..............................28
A.3. License ...............................................35
Authors' Addresses ............................................36
1. Introduction
Internet-based traffic is dramatically increasing every year.
Moreover, such traffic is also becoming more dynamic. Thus,
transport networks need to evolve from current DWDM systems towards
elastic optical networks, based on flexi-grid transmission and
switching technologies. This technology aims at increasing both
transport network scalability and flexibility, allowing the
optimization of bandwidth usage.
This document presents a YANG model for flex-grid objects in the
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dynamic optical network, including the nodes, transponders and links
between them, as well as how such links interconnect nodes and
transponders.
The YANG model for flexi-grid [I-D.draft-ietf-ccamp-flexi-grid-fwk]
networks allows the representation of the flex-grid optical layer of
a network, combined with the underlying physical layer. The model is
defined in two YANG modules:
o Optical-TED (Traffic Engineering Database): This module defines
all the information needed to represent the flex-grid optical
node, an transponder and link.
o Media-channel: This module defines the whole path from a source
transponder to the destination through a number of intermediate
nodes.
This document identifies the flexi-grid components, parameters and
their values, characterizes the features and the performances of the
flex-grid elements. An application example is provided towards the
end of the document to better understand their utility.
2. Conventions used in this document
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].
In this document, these words will appear with that interpretation
only when in ALL CAPS. Lower case uses of these words are not to be
interpreted as carrying RFC-2119 significance.
In this document, the characters ">>" preceding an indented line(s)
indicates a compliance requirement statement using the key words
listed above. This convention aids reviewers in quickly identifying
or finding the explicit compliance requirements of this RFC.
3. Flex-grid network topology model overview
YANG is a data modeling language used to model configuration data
manipulated by the NETCONF protocol. Several YANG models have already
been specified for network configurations. For instance, the work in
[I-D.draft-ietf-i2rs-yang-network-topo] has proposed a YANG model of
a TED, but only covering the IP layer. A YANG model has also been
proposed in [I-D.draft-dharini-netmod-g-698-2-yang] to configure
flex-grid DWDM parameters.
As stated before, we propose a model to describe an flex-grid
topology that is split in two YANG sub-modules:
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o flexgrid-TED: In order to be compatible with existing proposals,
we augment the definitions contained in [RFC6020], by defining the
different elements we find in an flex-grid network: a node, a
transponder and a link. For that, each of those elements is
defined as a container that includes a group of attributes.
References to the elements are provided to be later used in the
definition of a media channel. It also includes the data types for
the type of modulation, the flex-grid technology, the FEC, etc.
o Media-channel: This module defines the whole path from a source
transponder to the destination through a number of intermediate
nodes and links. For this, it takes the information defined before
in the flex-grid TED.
The following section provides a detailed view of each module.
4. Main building blocks
Subsections below detail each of the defined YANG modules. They are
listed in Appendix A.
4.1. Flex-grid TED
The description of the three main components, flex-grid-node,
flex-grid-transponder and flex-grid-link is provided below.
flex-grid-sliceable-transponders are also defined.
<flex-grid-node> ::= <flex-grid-node-attributes>
<flex-grid-node>: This element designates a node in the network
<flex-grid-node-attributes> ::= <node-id> <list-interface>
<connectivity_matrix>
<optical-node-attributes>: Contains all the attributes
related to the node, such as its unique id, its interfaces or
its management addresses.
<node-id>: An unique numeric identifier for the node. It is
also used as a reference in order to point to it in the
media-channel module.
<list-interface> ::= <name> <port-number> <input-port>
<output-port> <description> <interface-type>
[<numbered-interface> / <unnumbered-interface>]
<list-interface>: The list containing all the
information of the interfaces
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<name>: Determines the interface name.
<port-number>: Port number of the interface.
<input-port>: Boolean value that defines whether the
interface is input or not.
<output-port>: Boolean value that defines whether the
interface is output or not.
<description>: Description of the usage of the interface.
<interface-type>: Determines if the interface is numbered
or unnumbered.
<numbered-interface> ::= <n-i-ip-address>
<numbered-interface>: A interface with its own IP
address
<n-i-ip-address>: Only available if <interface-type>
is "numbered-interface". Determines the IP address
of the interface.
<unnumbered-interface> ::= <u-i-ip-address> <label>
<unnumbered-interface>: A interface that needs a
label to be unique
<u-i-ip-address>: Only available if <interface-type>
is "numbered-interface". Determines the node IP
address, which with the label defines the interface.
<label>: Label that determines the interface, joint
with the node IP address.
<connectivity-matrix> ::= <connections>
<connectivity-matrix>: Determines whether a connection
port in/port out exists.
<connections> ::= <input-port-id> <output-port-id>
<connections>: The actual connection between an
input port and an output port
<input-port-id>: The input port associated with the
output port.
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<output-port-id>: The output port associated with
the input port.
<optical-transponder> ::= <optical-transponder-attributes> <optical-
node-attributes>
<optical-transponder>: Determines an optical transponder in the
network
<optical-transponder-attributes> ::= <available-modulation>
<modulation-type> <available-FEC> <FEC-enabled> [<FEC-type>]
<optical-transponder-attributes>: Contains all the attributes
related to the transponder, such as whether it has FEC
enabled or not, or its modulation type..
<available-modulation>: It provides a list of the modulations
available at this transponder.
<modulation-type>: Determines the type of modulation in use:
QPSK, QAM16, QAM64...
<available-FEC>: It provides a list of the FEC algorithms
available at this transponder.
<FEC-enabled>: Boolean value that determines whether is the
FEC enabled or not.
<FEC-type>: Determines the type of FEC in use: reed-solomon,
hamming-code, enum golay, BCH...
<optical-node-attributes>: See above, node attributes are reused
also for transponders.
<optical-sliceable-transponder> ::= <carrier-id>
<optical-transponder-attributes>
<optical-sliceable-transponder>: Provides a list of transponders.
<carrier-id>: An identifier for each one of the transponders in the
list.
<optical-transponder-attributes>: See above, transponder attributes
are reused also for sliceable transponders.
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<link> ::= <optical-link-attributes>
<link>: This element describes all the information of a link.
<optical-link-attributes> ::= <link-id> <technology-type>
<available-label-flexigrid> <N-max> <base-frequency>
<nominal-central-frequency-granularity> <slot-width-granularity>
<optical-link-attributes>: Contains all the attributes
related to the link, such as its unique id, its N value, its
latency, etc.
<link-id>: Unique id of the link
<technology-type>: Optical technology used in this link:
Flexigrid, WDM50, WDM100...
<available-label-flexigrid>: Array of bits that determines,
with each bit, the availability of each interface for
flexigrid technology.
<N-max>: The max value of N in this link, being N the number
of slots.
<base-frequency>: The default central frequency used in the
link.
<nominal-central-frequency-granularity>: It is the spacing
between allowed nominal central frequencies and it is set to
6.25 GHz (note: sometimes referred to as 0.00625 THz).
<slot-width-granularity>: 12.5 GHz, as defined in G.694.1.
4.2. Media-channel/network-media-channel
The model defines two types of media channel, following the
terminology summarized in [I-D.draft-ietf-ccamp-flexi-grid-fwk]:
media-channel, which represents a (effective) frequency slot
supported by a concatenation of media elements (fibers, amplifiers,
filters, switching matrices...); network media channel: It is a media
channel that transports an Optical Tributary Signal. In the model,
the network media channel has as end-points transponders, which are
the source and destination of the optical signal. The description of
these components is provided below:
<media-channel> ::= <source> <destination> <link-channel> <effective-
freq-slot>
<media-channel>: Determines a media-channel and its components.
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<source > ::= <source-node> <source-port>
<source>: In a media-channel, the source is a node and a port.
<source-node>: Reference to the source node of the media
channel.
<source-port>: Reference to the source port in the source
<node.
<destination> ::= <destination-node> <destination-port>
<destination>: In a media-channel, the destination is a node
and a port.
<destination-node>: Reference to the destination node of the
media channel.
<destination-port>: Reference to the destination port in the
destination node.
<link-channel> ::= <link-id> <N> <M> <source-node> <source-port>
<destination-node> <destination-port> <link> <bidirectional>
<link-channel>: Defines a list with each of the links between
elements in the media channel.
<link-id>: Unique identifier for the link channel
<N>: N used for this link channel.
<M>: M used for this link channel.
<source-node>: Reference to the source node of this link
channel.
<source-port>: Reference to the source port of this link
channel.
<destination-node>: Reference to the destination node of this
link channel.
<destination-port>: Reference to the destination port of this
link channel.
<link>: Reference to the link of this link channel.
<bidirectional>: Indicates if this link is bidirectional or
not.
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<effective-freq-slot> ::= <N> <M>
<effective-freq-slot>: Defines the effective frequency slot of
the media channel, which could be different from the one
defined in the link channels.
<N>: Defines the effective N for this media channel.
<M>: Defines the effective M for this media channel.
<network-media-channel> ::= <source> <destination> <link-channel>
<effective-freq-slot>
<network-media-channel>: Determines a network media-channel and
its components.
<source > ::= <source-node> <source-transponder>
<source>: In a network media channel, the source is defined by
a node and a transponder.
<source-node>: Reference to the source node of the media
channel.
<source-transponder>: Reference to the source transponder in
the source node.
<destination> ::= <destination-node> <destination-transponder>
<destination>: In a network media channel, the destination is
defined by a node and a transponder
<destination-node>: Reference to the destination node of the
media channel.
<destination-port>: Reference to the destination port in the
destination node.
<link-channel>: See above, the information is reused for both types
of media channels.
<effective-freq-slot>: See above, this information is reused for
both types of media channels.
5. Example of use
In order to explain how this model is used, we provide the following
example. An optical network usually has multiple transponders,
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switches (nodes) and links between them. Figure 1 shows a simple
topology, where two physical paths interconnect two optical
transponders.
Media channel
<==================================================>
Path x
<-------------------------------------------------->
+---------+ +---------+
Link 1 | Optical | Link 2 | Optical | Link 3
.--->| node |<-------->| node |<---.
| | B | | C | |
| +---------+ +---------+ |
v v
+-------------+ +-------------+
| Optical | | Optical |
| transponder | | transponder |
| A | | E |
+-------------+ +-------------+
^ ^
| +---------+ |
| Link 4 | Optical | Link 5 |
'------------>| node |<-----------'
| D |
+---------+
<-------------------------------------------------->
Path y
Figure 1. Topology example.
In order to configure a media channel to interconnect transponders A
and E, first of all we have to populate the optical TED YANG model
with all elements in the network:
1. We define the transponders A and E, including their FEC type, if
enabled, and modulation type. We also provide node identifiers
and addresses for the transponders, as well as interfaces
included in the transponders. It is also possible sliceable
transponders if needed.
2. We do the same for the nodes B, C and D, providing their
identifiers, addresses and interfaces, as well as the internal
connectivity matrix between interfaces.
3. Then, we also define the links 1 to 5 that interconnect nodes and
transponders, indicating which flexi-grid labels are available.
Other information, such as the slot frequency and granularity are
also provided.
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Next, we can configure the media channel from the information we
have stored in the optical TED, by querying which elements are
available, and planning the resources that have to be provided on
each situation. Note that every element in the optical TED has a
reference, and this is the way in which they are called in the media
channel.
4. Depending on the case, it is possible to define either the source
and destination node ports, or the source and destination node
and transponder. In our case, we would define a network media
channel, with source transponder A and source node B, and
destination transponder E and destination node C. Thus, we are
going to follow path x.
5. Then, for each link in the path x, we indicate which channel we
are going to use, providing information about the slots, and what
nodes are connected.
Finally, the optical TED has to be updated with each element usage
status each time a media channel is created or torn down.
6. Formal Syntax
The following syntax specification uses the augmented Backus-Naur
Form (BNF) as described in [RFC5234].
7. Security Considerations
The transport protocol used for sending the managed information MUST
support authentication and SHOULD support encryption.
The defined data-model by itself does not create any security
implications.
8. IANA Considerations
The namespace used in the defined models is currently based on the
IDEALIST project URI. Future versions of this document could
register a URI in the IETF XML registry [RFC3688], as well as in the
YANG Module Names registry [RFC6020].
9. References
9.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
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[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234, January 2008,
<http:/www.rfc-editor.org/info/rfc5234>.
[RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for
the Network Configuration Protocol (NETCONF)", RFC 6020,
October 2010.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
9.2. Informative References
[I-D.draft-ietf-ccamp-flexi-grid-fwk] Gonzalez de Dios, O., Casellas,
R., "Framework and Requirements for GMPLS based control of
Flexi-grid DWDM networks", draft-ietf-ccamp-flexi-grid-fwk-05,
2015.
[I-D.draft-ietf-i2rs-yang-network-topo] Clemm, A., Ananthakrishnan,
H., Medved, J., Tkacik, T., Varga, R., Bahadur, N., "A YANG
Data Model for Network Topologies", Internet Draft
draft-ietf-i2rs-yang-network-topo-01.txt, 2015.
[I-D.draft-dharini-netmod-g-698-2-yang] Galimberti, G., Kunze, R.,
Kam Lam, Hiremagalur, D., Grammel, G., Eds., "A YANG model to
manage optical interface parameters of DWDM applications",
Internet Draft, draft-dharini-netmod-g-698-2-yang-04, 2015.
10. Contributors
The model presented in this paper was contributed to by more people
than can be listed on the author list. Additional contributors
include:
o Daniel Michaud Vallinoto, Universidad Autonoma de Madrid
11. Acknowledgments
The work presented in this Internet-Draft has been partially funded
by the European Commission under the project Industry-Driven Elastic
and Adaptive Lambda Infrastructure for Service and Transport
Networks (IDEALIST) of the Seventh Framework Program, with Grant
Agreement Number: 317999.
Appendix A. YANG models
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A.1. Flex-grid TED YANG Model
<CODE BEGINS> file "ietf-flexigrid.yang"
module flexi-grid-TED {
namespace "urn:ietf:params:xml:ns:yang:ietf-flexigrid-topology";
prefix flexigrid;
import ietf-inet-types {
prefix inet;
}
import network-topology {
prefix nt;
}
organization
"IETF CCAMP Working Group";
contact
"Editor: Jorge Lopez <jorge.lopez_vergara@uam.es>";
description
"This module contains a collection of YANG definitions for
Flexi-Grid.
Copyright (c) 2015 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 2015-07-01 {
description
"version 2.";
reference
"RFC XXX: A Yang Data Model for Flexi-Grid Optical Networks ";
}
typedef optical-node-type {
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description
"Determines the node type: optical-sliceable-transponder";
type enumeration {
enum optical-sliceable-transponder;
}
typedef modulation {
description
"Enumeration that defines the type of wave modulation";
type enumeration {
enum QPSK;
enum DP_QPSK;
enum QAM16;
enum DP_QAM16;
enum DC_DP_QAM16;
}
}
typedef optical-technology {
description "Enumeration that defines the type of
optical technology";
type enumeration {
enum Flexigrid;
enum WDM50;
enum WDM100;
}
}
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typedef FEC {
description "Enumeration that defines the type of
FEC";
type enumeration {
enum reed-solomon;
enum hamming-code;
enum golay;
}
}
typedef interface-type {
description "Enumeration that defines if an interface
is numbered or unnumbered";
type enumeration {
enum numbered-interfaces;
enum unnumbered-interfaces;
}
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}
typedef optical-transponder-ref {
type leafref {
path "/nt:network-
topology/nt:topology/nt:node/nt:node-id";
}
description
"This type is used by data models that need
to reference
an optical transponder.";
}
typedef optical-node-ref {
type leafref {
path "/nt:network-
topology/nt:topology/nt:node/nt:node-id";
}
description
"This type is used by data models that need
to reference
an optical node.";
}
typedef optical-link-ref {
type leafref {
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path "/nt:network-
topology/nt:topology/nt:link/nt:link-id";
}
description
"This type is used by data models that need
to reference
an optical link.";
}
typedef optical-node-port-ref {
type leafref {
path "/nt:network-
topology/nt:topology/nt:node/o-ted:interface/o-ted:port-number";
}
description
"This type is used by data models that need
to reference
an optical link.";
}
grouping optical-ted-topology-type {
container optical-ted-topology {
presence "indicates optical TED Topology";
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}
}
grouping optical-ted-topology-attributes {
container optical-ted-topology-attributes {
leaf name {
description "Name of the topology";
type string;
}
}
}
grouping optical-node-type {
description "Used to determine the type of the
optical node.";
leaf type {
type optical-node-type;
}
}
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grouping optical-node-attributes {
description "Set of attributes of an optical node.";
list interface {
key "name";
unique "port-number";
description "List of interfaces contained by
the node";
leaf name {
type string;
}
leaf port-number {
type uint32;
description "Number of the port used
by the interface";
}
leaf input-port {
type boolean;
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description "Determines if the port
is an input port";
}
leaf output-port {
type boolean;
description "Determines if the port
is an output port";
}
leaf description {
type string;
description "Description of the
interface";
}
leaf interfaces-type {
type interface-type;
description "Determines the type of
the interface";
}
container numbered-interface {
when "interfaces-type == numbered-
interfaces";
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description "Grouping that defines an
numbered interface with an ip-address";
leaf n-i-ip-address{
type inet:ip-address;
}
}
container unnumbered-interface {
when "interfaces-type == unnumbered-
interfaces";
description "Grouping that defines an
unnumbered interface with an ip-address and a label";
leaf u-i-ip-address{
type inet:ip-address;
}
leaf label {
type uint32;
}
}
}
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container connectivity-matrix {
list connections {
key "input-port-id";
leaf input-port-id {
type optical-node-port-ref;
}
leaf output-port-id {
type optical-node-port-ref;
}
}
}
}
grouping optical-transponder-attributes {
description "Set of attributes of an optical
transponder.";
leaf-list available-modulation {
type modulation;
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description "List determining all the
available modulations";
}
leaf modulation-type {
type modulation;
description "Modulation type of the wave";
}
leaf-list available-FEC {
type FEC;
description "List determining all the
available FEC";
}
leaf FEC-enabled {
type boolean;
description "Determines whether the FEC is
enabled or not";
}
leaf FEC-type {
type FEC;
description "FEC type of the transponder";
}
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uses optical-node-attributes;
}
grouping optical-sliceable-transponder-attributes {
description
"Grouping that defines a sliceable
transponder which is composed by several transponders.";
list transponder-list {
key "carrier-id";
leaf carrier-id {
type uint32;
}
uses optical-transponder-attributes;
}
}
grouping optical-link-attributes {
description "Set of attributes of an optical link";
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leaf-list available-label-flexigrid {
type bits {
bit is-available;
}
description "Array of bits that determines
whether a spectral slot is available or not.";
when "technology-type == Flexigrid";
}
description "Array of bits that determines
whether a wavelength is available or not.";
when "technology-type != Flexigrid";
}
leaf N-max {
type int32;
description "Maximum number of channels
available.";
}
leaf base-frequency {
type decimal64 {
fraction-digits 5;
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}
units THz;
default 193.1;
description "Default central frequency";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
}
leaf nominal-central-frequency-granularity {
type decimal64 {
fraction-digits 5;
}
units GHz;
default 6.25;
description "It is the spacing between
allowed nominal central frequencies and it is set to 6.25 GHz";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
}
leaf slot-width-granularity {
type decimal64 {
fraction-digits 5;
}
units GHz;
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description "Minimum space between slot
widths";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
}
leaf technology-type {
type optical-technology;
description "Determines which technology is
used at optical-level";
}
}
augment "/nt:network-topology/nt:topology/nt:topology-types"
{
uses optical-ted-topology-type;
}
augment "/nt:network-topology/nt:topology" {
when "nt:topology-types/optical-ted-topology";
uses optical-ted-topology-attributes;
}
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augment "/nt:network-topology/nt:topology/nt:node" {
when "../nt:topology-types/o-ted:optical-ted-
topology";
uses optical-node-type;
}
augment "/nt:network-topology/nt:topology/nt:node" {
when "../nt:topology-types/o-ted:optical-ted-
topology";
uses optical-node-attributes;
}
augment "/nt:network-topology/nt:topology/nt:node" {
when "o-ted:optical-node-type/o-ted:optical-
transponder";
uses optical-transponder-attributes;
}
augment "/nt:network-topology/nt:topology/nt:node" {
when "o-ted:optical-node-type/o-ted:optical-
sliceable-transponder";
uses optical-sliceable-transponder-attributes;
}
augment "/nt:network-topology/nt:topology/nt:link" {
when "../nt:topology-types/o-ted:optical-ted-
topology";
uses optical-link-attributes;
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}
}
A.2. Media Channel YANG Model
module media-channel {
namespace "http://www.tid.es/idealist ";
prefix m-c;
import optical-TED {
prefix o-ted;
}
revision 2014-06-05;
container media-channel {
description "Media association that represents both
the topology
(i.e., path through the media) and
the resource (frequency slot) that
it occupies. As a topological
construct, it represents a (effective)
frequency slot supported by a
concatenation of media elements
(fibers, amplifiers, filters,
switching matrices...). This term is
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used to identify the end-to-end
physical layer entity with its
corresponding (one or more) frequency
slots local at each link
filters.";
reference "draft-ietf-ccamp-flexi-grid-fwk-01";
container source {
leaf source-node {
type o-ted:optical-node-ref;
}
leaf source-port {
type o-ted:optical-node-port-ref;
}
}
container destination {
leaf destination-node {
type o-ted:optical-node-ref;
}
leaf destination-port {
type o-ted:optical-node-port-ref;
}
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}
uses media-channel-attributes;
}
container network-media-channel {
description "It is a media channel that transports an
Optical Tributary Signal ";
reference "draft-ietf-ccamp-flexi-grid-fwk-01";
container source {
leaf source-node {
type o-ted:optical-node-ref;
}
leaf source-transponder {
type o-ted:optical-transponder-ref;
}
}
container destination {
leaf destination-node {
type o-ted:optical-node-ref;
}
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leaf destination-transponder {
type o-ted:optical-transponder-ref;
}
}
uses media-channel-attributes;
}
grouping media-channel-attributes {
container effective-freq-slot {
description "The effective frequency
slot is an attribute of a media channel and,
being a frequency slot,
it is described by its nominal central
frequency and slot width";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
leaf N {
type int32;
description
"Is used to determine the
Nominal Central Frequency. The set of nominal
central frequencies can be
built using the following expression f =
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193.1 THz + n x 0.00625 THz,
where 193.1 THz is ITU-T ''anchor
frequency'' for transmission
over the C band, n is a positive or
negative integer including
0.";
reference "draft-ietf-ccamp-flexi-
grid-fwk-01";
}
leaf M {
type int32;
description
"Is used to determine the
slot width. A slot width is constrained
to be M x SWG (that is, M x
12.5 GHz), where M is an integer greater
than or equal to 1.";
reference "draft-ietf-ccamp-flexi-
grid-fwk-01";
}
}
list link-channel {
key "link-id";
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leaf link-id {
type int32;
}
uses link-channel;
}
}
grouping link-channel {
description "A link channel is one of the
concatenated elements of the media channel.";
leaf N {
type int32;
description
"Is used to determine the Nominal
Central Frequency. The set of nominal
central frequencies can be built
using the following expression f =
193.1 THz + n x 0.00625 THz, where
193.1 THz is ITU-T ''anchor
frequency'' for transmission over
the C band, n is a positive or
negative integer including 0.";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
}
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leaf M {
type int32;
description
"Is used to determine the slot width.
A slot width is constrained
to be M x SWG (that is, M x 12.5
GHz), where M is an integer greater
than or equal to 1.";
reference "draft-ietf-ccamp-flexi-grid-fwk-
01";
}
leaf source-node {
type o-ted:optical-node-ref;
}
leaf source-port {
type o-ted:optical-node-port-ref;
}
leaf destination-node {
type o-ted:optical-node-ref;
}
leaf destination-port {
type o-ted:optical-node-port-ref;
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}
leaf link {
type o-ted:optical-link-ref;
}
leaf bidireccional {
type boolean;
description "Determines whether the link is
bidireccional or not";
}
}
}
<CODE ENDS>
A.3. License
Copyright (c) 2015 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, are permitted provided that the following conditions
are met:
o Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
o Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
o Neither the name of Internet Society, IETF or IETF Trust, nor the
names of specific contributors, may be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Authors' Addresses
Jorge E. Lopez de Vergara
Universidad Autonoma de Madrid
Escuela Politecnica Superior
C/Francisco Tomas y Valiente, 11
E-28049 Madrid, Spain
Email: jorge.lopez_vergara@uam.es
Victor Lopez
Telefonica I+D/GCTO
Distrito Telefonica
E-28050 Madrid, Spain
Email: victor.lopezalvarez@telefonica.com
Oscar Gonzalez de Dios
Telefonica I+D/GCTO
Distrito Telefonica
E-28050 Madrid, Spain
Email: oscar.gonzalezdedios@telefonica.com
Daniel King
Lancaster University
Email: d.king@lancaster.ac.uk
Young Lee
Huawei Technologies
Email: leeyoung@huawei.com
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Zafar Ali
Cisco Systems
Email: zali@cisco.com
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