Internet DRAFT - draft-vergara-ccamp-flexigrid-media-channel-yang
draft-vergara-ccamp-flexigrid-media-channel-yang
CCAMP Working Group J.E. Lopez de Vergara
Internet Draft Universidad Autonoma de Madrid
Intended status: Standards Track Daniel Perdices
Expires: November 11, 2018 Naudit HPCN
V. Lopez
O. Gonzalez de Dios
Telefonica I+D/GCTO
D. King
Lancaster University
Y. Lee
Huawei
G. Galimberti
Cisco Photonics Srl
May 8, 2018
YANG data model for Flexi-Grid media-channels
draft-vergara-ccamp-flexigrid-media-channel-yang-02.txt
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carefully, as they describe your rights and restrictions with
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Abstract
This document defines a YANG model for managing flexi-grid optical
media channels, complementing the information provided by the
flexi-grid TED model.
It is also grounded on other defined YANG abstract models.
Table of Contents
1. Introduction .............................................. 2
2. Conventions used in this document ......................... 3
3. Flexi-grid media-channel overview ......................... 3
4. Example of use ............................................ 4
5. Media Channel YANG Model .................................. 5
5.1. YANG Model - Tree .................................... 5
5.2. YANG Model - Code .................................... 6
5.3. License .............................................. 10
6. Security Considerations ................................... 10
7. IANA Considerations ....................................... 10
8. References ................................................ 11
8.1. Normative References ................................. 11
8.2. Informative References ............................... 11
9. Contributors .............................................. 11
10. Acknowledgments ........................................... 11
Authors' Addresses ............................................ 12
1. Introduction
Transport networks are evolving from current DWDM systems towards
elastic optical networks, based on flexi-grid transmission and
switching technologies [RFC7698]. Such technology aims at increasing
both transport network scalability and flexibility, allowing the
optimization of bandwidth usage.
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While [I-D.draft-ietf-ccamp-flexigrid-yang] focuses on flexi-grid
objects such as nodes, transponders and links, this document presents
a YANG model for the flexi-grid media-channel. This YANG module
defines the whole path from a source transponder or node to the
destination through a number of intermediate nodes in the flexi-grid
network.
This document identifies the flexi-grid media-channel components,
parameters and their values, characterizes the features and the
performances of the flexi-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. Flexi-grid media-channel overview
The present model defines a flexi-grid media-channel mainly
composed of:
- source address
- source flexi-grid port
- source flexi-grid transponder
- destination address
- destination flexi-grid port
- destination flexi-grid transponder
- A list of links that defines the path
- Other optical attributes
Each path can be a media-channel (only defined by source and
destination node) or a network media-channel (additionally needs
source and destination transponders). Therefore, all the attributes
are optional to support both situations.
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This is achieved by a combination of the traffic engineering tunnel
attributes explained in [I-D.draft-ietf-teas-yang-te] and augments
when necessary. For instance, source address, source flexi-grid
transponder, destination address and destination flexi-grid
transponder attributes are directly taken from tunnel, whereas other
attributes such as source flexi-grid port, destination flexi-grid
port are defined, as they are specific for flexi-grid.
4. Example of use
In order to explain how this model is used, we provide the following
example. An optical network usually has multiple transponders,
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 |Flexi-grid| Link 2 |Flexi-grid| Link 3
.--->| node |<-------->| node |<---.
| | B | | C | |
| +----------+ +----------+ |
v v
/-----------\ /-----------\
/ Flexi-grid \ / Flexi-grid \
| transponder | | transponder |
\ A / \ E /
\-----------/ \-----------/
^ ^
| +----------+ |
| Link 4 |Flexi-grid| Link 5 |
'------------>| node |<-----------'
| D |
+----------+
<-------------------------------------------------->
Path y
Figure 1. Topology example.
After the nodes, links and transponders have been defined using
[I-D.draft-ietf-ccamp-flexigrid-yang], we can configure the
media-channel from the information we have stored in the
flexi-grid 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 flexi-grid TED has a reference, and
this is the way in which they are called in the media-channel.
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1. 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.
2. 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.
3. Finally, the flexi-grid TED has to be updated with each element
usage status each time a media channel is created or torn down.
5. Media Channel YANG Model
5.1. YANG Model - Tree
module: ietf-flexi-grid-media-channel
augment /te:te/te:tunnels/te:tunnel:
+--rw source-port? fg-ted:flexi-grid-node-port-ref
+--rw destination-port? fg-ted:flexi-grid-node-port-ref
+--rw effective-freq-slot
+--rw N? int32
+--rw M? int32
augment /te:te/te:tunnels/te:tunnel/te:state:
+--ro source-port? fg-ted:flexi-grid-node-port-ref
+--ro destination-port? fg-ted:flexi-grid-node-port-ref
+--ro effective-freq-slot
+--ro N? int32
+--ro M? int32
augment /te:te/te:lsps-state/te:lsp:
+--ro N? int32
+--ro M? int32
+--ro source-port? fg-ted:flexi-grid-node-port-ref
+--ro destination-port? fg-ted:flexi-grid-node-port-ref
+--ro link? fg-ted:flexi-grid-link-ref
+--ro bidirectional? boolean
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5.2. YANG Model - Code
<CODE BEGINS> file "ietf-flexi-grid-media-channel@2018-05-08.yang"
module ietf-flexi-grid-media-channel {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-flexi-grid-media-channel";
prefix "fg-mc";
import ietf-flexi-grid-ted {
prefix "fg-ted";
}
import ietf-te {
prefix "te";
}
import ietf-network {
prefix "nd";
}
organization
"IETF CCAMP Working Group";
contact
"Editor: Jorge Lopez de Vergara
<jorge.lopez_vergara@uam.es>";
description
"This module contains a collection of YANG definitions for
a Flexi-Grid media channel.
Copyright (c) 2018 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 2018-05-08 {
description
"version 2.";
reference
"RFC XXX: A Yang Data Model for Flexi-Grid media-channels";
}
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grouping flexi-grid-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 used to identify the end-to-end physical layer entity
with its corresponding (one or more) frequency slots
local at each link filters.";
reference "rfc7698";
leaf source-port {
type fg-ted:flexi-grid-node-port-ref;
description "Source port";
}
leaf destination-port {
type fg-ted:flexi-grid-node-port-ref;
description "Destination port";
}
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 "rfc7698";
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 "rfc7698";
}
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 "rfc7698";
}
}
}
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grouping link-channel-attributes {
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 "rfc7698";
}
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 "rfc7698";
}
leaf source-port {
type fg-ted:flexi-grid-node-port-ref;
description "Source port of the link channel";
}
leaf destination-port {
type fg-ted:flexi-grid-node-port-ref;
description "Destination port of the link channel";
}
leaf link {
type fg-ted:flexi-grid-link-ref;
description "Link of the link channel";
}
leaf bidirectional {
type boolean;
description
"Determines whether the link is bidirectional or
not";
}
}
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/* Augment for media-channel */
augment "/te:te/te:tunnels/te:tunnel" {
when "/nd:networks/nd:network/nd:network-types/
fg-ted:flexi-grid-network"{
description "Augment only for Flexigrid network.";
}
description "Augment tunnel with media-channel config";
uses flexi-grid-media-channel;
}
augment "/te:te/te:tunnels/te:tunnel/te:state" {
when "/nd:networks/nd:network/nd:network-types/
fg-ted:flexi-grid-network"{
description "Augment only for Flexigrid network.";
}
uses flexi-grid-media-channel;
description "Augment tunnel with media-channel state";
}
/* Augment for LSP */
augment "/te:te/te:lsps-state/te:lsp" {
when "/nd:networks/nd:network/nd:network-types/
fg-ted:flexi-grid-network"{
description "Augment only for Flexigrid network.";
}
uses link-channel-attributes;
description "Augment LSP for paths";
}
}
<CODE ENDS>
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5.3. License
Copyright (c) 2018 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
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.
6. 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.
7. IANA Considerations
The namespace used in the defined models is currently based on the
METRO-HAUL 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].
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8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.
8.2. Informative References
[RFC7698] Gonzalez de Dios, O., Casellas, R., Eds. "Framework and
Requirements for GMPLS-Based Control of Flexi-Grid Dense
Wavelength Division Multiplexing (DWDM) Networks",
RFC7698, November 2015.
[I-D.draft-ietf-ccamp-flexigrid-yang] Lopez de Vergara, J.,
Perdices, D., Lopez, V., Gonzalez de Dios, O., King, D.,
Lee, Y., Galimberti, G., "YANG data model for Flexi-Grid
Optical Networks", Internet Draft,
draft-ietf-ccamp-flexigrid-yang-00, 2018.
[I-D.draft-ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V., Shah, H.,
Bryskin, I., Chen, X., Jones, R., and B. Wen, "A YANG Data
Model for Traffic Engineering Tunnels and Interfaces",
draft-ietf-teas-yang-te-14, 2018.
9. 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 Zafar Ali, Cisco Systems
o Daniel Michaud Vallinoto, Universidad Autonoma de Madrid
10. Acknowledgments
The work presented in this Internet-Draft has been partially funded
by the European Commission under the project H2020 METRO-HAUL
(Metro High bandwidth, 5G Application-aware optical network, with
edge storage, compUte and low Latency), Grant Agreement number:
761727, and by the Spanish Ministry of Economy and Competitiveness
under the project TRAFICA, MINECO/FEDER TEC2015-69417-C2-1-R.
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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
Daniel Perdices Burrero
Naudit High Performance Computing and Networking, S.L.
C/Faraday, 7
E-28049 Madrid, Spain
Email: daniel.perdices@naudit.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
Gabriele Galimberti
Cisco Photonics Srl
Email: ggalimbe@cisco.com
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