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Versions: 00 01 02 03 04 draft-ietf-ccamp-wson-yang

CCAMP Working Group                                           Y. Lee (Editor)
                                                                    D. Dhody
                                                                    X. Zhang
Internet Draft                                                        Huawei
Intended status: Standard Track                                       A. Guo
                                                                        ADVA
                                                                    V. Lopez
                                                                  Telefonica
                                                                     D. King
                                                             U. of Lancaster
                                                                     B. Yoon
                                                                        ETRI

Expires: June 15, 2016                                     December 16, 2015

                   A Yang Data Model for WSON Optical Networks


                        draft-lee-ccamp-wson-yang-04.txt


Abstract

   This document provides a YANG data model for the routing and wavelength assignment
   (RWA) TE topology in wavelength switched optical networks (WSONs).



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
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   This Internet-Draft will expire on June 16, 2016.

Copyright Notice


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   Copyright (c) 2015 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


   1. Introduction    ................................................... 2
   2. Routing and Wavelength Assignment Informational Model.............. 3
      2.1. Connectivity Matrix Model .................................... 3
      2.2. Resource Pool Model  ......................................... 4
      2.3. Port Label Restriction Model ................................. 8
      2.4. Wavelength Availability on Links .............................. 8
   3. YANG Model (Tree Structure)....................................... 9
   4. WSON-RWA YANG Model  ............................................ 10
   5. Security Considerations ......................................... 15
   6. IANA Considerations  ............................................ 15
   7. Acknowledgments   ............................................... 15
   8. References    ................................................... 16
      8.1. Normative References ....................................... 16
      8.2. Informative References ..................................... 16
   9. Contributors   .................................................. 16
   Authors' Addresses   ............................................... 16

1. Introduction

   This document provides a YANG data model for the routing and wavelength assignment
   (RWA) Traffic Engineering (TE) topology in wavelength switched optical networks
   (WSONs). The YANG model described in this document is a WSON 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]. This document augments the generic TE topology draft
   [TE-TOPO].

   What is not in scope of this document is both impairment-aware WSON and flex-grid.





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2. Routing and Wavelength Assignment Informational Model

   The relevant information model in this document comprises

      - Connectivity Matrix Model (Section 2.1)
      - Resource Pool Model (Section 2.2)
      - Port Wavelength Restriction (Section 2.3)
      - Wavelength Availability on Links (Section 2.4)

   [Editor's Note: This version covers the corresponding YANG data model for the
   first two sections (Sections 2.1 and 2.2) and leaves the YANG model for Sections
   2.3 and 2.4 in the later version.]

   Sections 2.1 - 2.4 rehashes key information models from [RWA-Info] to facilitate
   the development of the YANG model (Section 3).

2.1. Connectivity Matrix Model

   The connectivity matrix (ConnectivityMatrix) represents either the potential
   connectivity matrix for asymmetric switches (e.g. ROADMs and such) or fixed
   connectivity for an asymmetric device such as a multiplexer.

   Note that multiple connectivity matrices are allowed and the Node_ID would be an
   appropriate identifier for the node to point the Connectivity matrix within the
   WSON RWA context.

   <Node_Information> ::= <Node_ID> [<ConnectivityMatrix>...]

   <ConnectivityMatrix> ::= <MatrixID>

                    <ConnType>

                    <Matrix>

   Where

   <MatrixID> is a unique identifier for the matrix.

   <ConnType> can be either 0 or 1 depending upon whether the connectivity is either
   fixed or switched.

   <Matrix> represents the fixed or switched connectivity in that Matrix(i, j) = 0 or
   1 depending on whether input port i can connect to output port j for one or more
   wavelengths.




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2.2. Resource Pool Model

   A WSON node may include regenerators or wavelength converters arranged in a shared
   pool. As discussed in [RFC6163] this can include Optical-Electronic-Optical (OEO)
   based Wavelength Division Multiplexing (WDM) switches as well. There are a number
   of different approaches used in the design of WDM switches containing regenerator
   or converter pools. However, from the point of view of path computation the
   following need to be known:

   1. The nodes that support regeneration or wavelength conversion.

   2. The accessibility and availability of a wavelength converter to convert from a
      given input wavelength on a particular input port to a desired output
      wavelength on a particular output port.

   3. Limitations on the types of signals that can be converted and the conversions
      that can be performed.



   The following Figures show resource pool architecture of WSON.



























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      I1   +-------------+                       +-------------+ O1
     ----->|             |      +--------+       |             |----->
      I2   |             +------+ Rb #1  +-------+             | O2
     ----->|             |      +--------+       |             |----->
           |             |                       |             |
           | Resource    |      +--------+       |  Resource   |
           | Pool        +------+        +-------+  Pool       |
           |             |      + Rb #2  +       |             |
           | Input       +------+        +-------|  Output     |
           | Connection  |      +--------+       |  Connection |
           | Matrix      |           .           |  Matrix     |
           |             |           .           |             |
           |             |           .           |             |
      IN   |             |      +--------+       |             | OM
     ----->|             +------+ Rb #P  +-------+             |----->
           |             |      +--------+       |             |
           +-------------+   ^               ^   +-------------+
                             |               |
                             |               |
                             |               |
                             |               |

                    Input wavelength      Output wavelength
                    constraints for       constraints for
                    each resource         each resource

   Note: Rb is a Resource Block.


                Figure 1  Schematic diagram of resource pool model.



   Since resources tend to be packaged together in blocks of similar devices, e.g.,
   on line cards or other types of modules, the fundamental unit of identifiable
   resource in this document is the "resource block". A resource block may contain
   one or more resources. A resource is the smallest identifiable unit of processing
   allocation. One can group together resources into blocks if they have similar
   characteristics relevant to the optical system being modeled, e.g., processing
   properties, accessibility, etc.

   This leads to the following formal high level model:

   <Node_Information> ::= <Node_ID>

                   [<ConnectivityMatrix>...]


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                   [<ResourcePool>]

   Where

   <ResourcePool> ::= <ResourceBlockInfo>...

               [<ResourceAccessibility>...]

               [<ResourceWaveConstraints>...]

               [<RBPoolState>]




  <ResourceAccessibility> ::= <PoolInputMatrix>

                       <PoolOutputMatrix>



   <ResourceWaveConstraints> ::= <InputWaveConstraints>

                       <OutputOutputWaveConstraints>



   <RBSharedAccessWaveAvailability> ::= [<InAvailableWavelengths>]

                            [<OutAvailableWavelengths>]



   <RBPoolState> ::=   <ResourceBlockID>

                 <NumResourcesInUse>

                 [<RBSharedAccessWaveAvailability>]

                 [<RBPoolState>]



   <ResourceBlockInfo> ::= <ResourceBlockSet>

                   [<InputConstraints>]



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                   [<ProcessingCapabilities>]

                   [<OutputConstraints>]

   Where  <ResourceBlockSet> is a list of resource block identifiers with the same
   characteristics. If this set is missing the constraints are applied to the entire
   network element.

   <InputConstraints> ::= <SharedInput>

                   [<OpticalInterfaceClassList>]

                   [<ClientSignalList>]

   <ProcessingCapabilities> ::= [<NumResources>]

                       [<RegenerationCapabilities>]

                       [<FaultPerfMon>]

                       [<VendorSpecific>]

   <OutputConstraints> := <SharedOutput>

                    [<OpticalInterfaceClassList>]

                   [<ClientSignalList>]

  <OpticalInterfaceClassList> ::= <OpticalInterfaceClass> ...



   <ClientSignalList>::=[<G-PID>]...

        1. Number of Resources within the block

        2. Regeneration capability

        3. Fault and performance monitoring

        4. Vendor Specific capability

     Note that the code points for Fault and performance monitoring and vendor
     specific capability are subject to further study.





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2.3. Port Label Restriction Model

   <LinkInfo> ::=  <LinkID>

              [<AdministrativeGroup>]

              [<InterfaceCapDesc>]

              [<Protection>]

              [<SRLG>...]

              [<TrafficEngineeringMetric>]

              [<PortLabelRestriction>...]

   Note that these additional link characteristics only applies to line side ports of
   WDM system or add/drop ports pertaining to Resource Pool (e.g., Regenerator or
   Wavelength Converter Pool). The advertisement of input/output tributary ports is
   not intended here.

   <PortLabelRestriction> ::= <MatrixID>

                     <Restriction parameters list>


   <Restriction parameters list> ::=

                     <LabelSet> ...


   Where

   MatrixID is the ID of the corresponding connectivity matrix.

     LabelSet is a conceptual set of labels (wavelengths).

     MaxNumChannels is the maximum number of channels that can be simultaneously used
     (relative to either a port or a matrix).

     LinkSet is a conceptual set of ports.

2.4. Wavelength Availability on Links

   In the previously presented information model there are a limited number of
   information elements that are dynamic, i.e., subject to change with subsequent
   establishment and teardown of connections. Depending on the protocol used to


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   convey this overall information model it may be possible to send this dynamic
   information separate from the relatively larger amount of static information
   needed to characterize WSON's and their network elements.

   <DynamicLinkInfo> ::=  <LinkID>

                   <AvailableLabels>

                   [<SharedBackupLabels>]

   AvailableLabels is a set of labels (wavelengths) currently available on the link.
   Given this information and the port wavelength restrictions one can also determine
   which wavelengths are currently in use. This parameter could potential be used
   with other technologies that GMPLS currently covers or may cover in the future.

   SharedBackupLabels is a set of labels (wavelengths) currently used for shared
   backup protection on the link. An example usage of this information in a WSON
   setting is given in [Shared]. This parameter could potential be used with other
   technologies that GMPLS currently covers or may cover in the future.



















3. YANG Model (Tree Structure)

   (Editor's Note: This version is based on the augmentation of draft-ietf-teas-yang-
   te-topo [TE-TOPO].)


   module: ietf-wson-topology
   augment /tet:te-topologies/tet:topology/tet:topology-types/tet:te-topology:


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       +--rw wson-topology
   augment /tet:te-topologies/tet:topology/tet:node/tet:te-node-
   attributes/tet:connectivity-matrix:
       +--rw wson-matrix
          +--rw device-type?        devicetype
          +--rw dir?                directionality
          +--rw matrix-interface* [in-port-id]
             +--rw in-port-id     wson-interface-ref
             +--rw out-port-id?   wson-interface-ref
   augment /tet:te-topologies/tet:topology/tet:node/tet:te-node-attributes/tet:te-
   link:
       +--rw wavelength-available-bitmap*   boolean
   augment /tet:te-topologies/tet:topology/tet:node:
       +--rw resource-pool* [resource-pool-id]
          +--rw resource-pool-id    uint32
          +--rw pool-state?         boolean
          +--rw matrix-interface* [in-port-id]
             +--rw in-port-id     wson-interface-ref
             +--rw out-port-id?   wson-interface-ref

















4. WSON-RWA YANG Model

    <CODE BEGINS> file "ietf-wson-topology@2015-10-14.yang"

         module   ietf-wson-topology {
     namespace "urn:ietf:params:xml:ns:yang:ietf-wson-topology";

     prefix wson;

     import ietf-inet-types {
     prefix inet;
     }

     import ietf-te-topology {
     prefix "tet";


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     }

     organization
       "IETF CCAMP Working Group";

     contact
       "Editor:   Young Lee  <leeyoung@huawei.com>";

     description
       "This module contains a collection of YANG definitions for
       RWA WSON.

       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 2015-10-14 {
       description
         "version 2.";

     reference
       "RFC XXX: A Yang Data Model for WSON Optical Networks ";
     }

     typedef wson-topology-id {
       type inet:uri;
       description
         "The WSON Topology ID";
     }

     typedef wson-node-id {
       type inet:ip-address;
       description
         "The WSON Node ID";
     }

     typedef devicetype {
       type enumeration {
         enum adm {
           value 1;
           description
             "Device is ADM";
         }

         enum roadm {
           value 2;
           description
             "Device is ROAMD/OXC";
         }
       }


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       description
         "device type: fixed (ADM) or switched (ROADM/OXC)";
     }

     typedef directionality {
       type enumeration {
         enum bidir {
           value 0;
           description
             "bi-directional";
         }
         enum input {
           value 1;
           description
             "input direction";
         }
         enum output {
           value 2;
           description
             "output direction";
         }
       }
       description
         "The directionality of link set";
     }



     typedef wson-interface-ref {
       type leafref {
       path "/tet:te-topologies/tet:topology/tet:node"
         + "/tet:te-node-attributes/tet:te-link"
         + "/tet:te-link-id";
       }
       description
         "This type is used by data models that need to
         reference WSON interface.";
     }

     augment "/tet:te-topologies/tet:topology/tet:topology-types"
         + "/tet:te-topology" {
       description "WSON augmentation.";
       container wson-topology{
         description
           "An empty WSON container to identify
           the topology type.";
       }
     }

     augment "/tet:te-topologies/tet:topology/tet:node"
         +"/tet:te-node-attributes"
         +"/tet:connectivity-matrix" {
       when "/tet:te-topologies/tet:topology/tet:topology-types"
         +"/tet:te-topology/wson-topology" {
         description
           "This augment is only valid for WSON.";


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       }
       description "WSON Connectivity Matrix augmentation.";
       container wson-matrix{
         description "WSON specific Matrix.";
         leaf device-type {
           type devicetype;
           description
             "device type: fixed (ADM) or switched
             (ROADM/OXC)";
         }
         leaf dir {
           type directionality;
           description
             "bi-directionality or input or output
             of link set";
         }

         list matrix-interface {
           key "in-port-id";

           description
             "matrix-interface describes input-ports
             and out-ports around a connectivity
             matrix";

           leaf in-port-id {
             type wson-interface-ref;
             description
               "The reference to in-port";
           }

           leaf out-port-id {
             type wson-interface-ref;
             description
               "The reference to out-port";
           }
         }
       }
     }

     augment "/tet:te-topologies/tet:topology/tet:node"
         + "/tet:te-node-attributes/tet:te-link"   {

       when "/tet:te-topologies/tet:topology/tet:topology-types"
         +"/tet:te-topology/wson-topology" {
         description
           "This augment is only valid for WSON.";
         }
       description "WSON Link augmentation.";

       leaf-list wavelength-available-bitmap {
         type boolean;
         description
           "array of bits (i.e., bitmap) that indicates
           if a wavelength is available or not on each
           channel.";


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       }
     }

     augment "/tet:te-topologies/tet:topology/tet:node" {
       when "/tet:te-topologies/tet:topology/tet:topology-types"
         +"/tet:te-topology/wson-topology" {
       description
         "This augment is only valid for WSON.";
       }
       description "WSON Node augmentation.";

       list resource-pool {
         key "resource-pool-id";
         description
           "The resource pool list";

         leaf resource-pool-id {
           type uint32;
           description
             "The resource pool ID";
         }

         leaf pool-state {
           type boolean;
           description
             "TRUE is state UP; FALSE is state down";
         }

         list matrix-interface {
           key "in-port-id";

           description
             "pool is described as matrix-interface
             with input-ports and output-ports
             around the pool";

           leaf in-port-id {
             type wson-interface-ref;
             description
               "The reference to in-interface";
           }

           leaf out-port-id {
             type wson-interface-ref;
             description
               "The reference to out-interface";
           }
         }
       }
     }
   }

   <CODE ENDS>





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5. Security Considerations

   TDB



6. IANA Considerations

   TDB

7. Acknowledgments

   This document was prepared using 2-Word-v2.0.template.dot.


































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8. References

    8.1. Normative References

   [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.

   [TE-TOPO] X. Liu, et al., "YANG Data Model for TE Topologies", work in progress:
             draft-ietf-teas-yang-te-topo.



    8.2. Informative References



9. Contributors


Authors' Addresses

   Young Lee (ed.)
   Huawei Technologies
   5340 Legacy Drive, Building 3
   Plano, TX 75023
   USA

   Phone: (469) 277-5838
   Email: leeyoung@huawei.com

   Dhruv Dhody
   Huawei Technologies India Pvt. Ltd,
   Near EPIP Industrial Area,  Kundalahalli Village,  Whitefield,
   Bangalore -  560 037 [H1-2A-245]

  Email: dhruv.dhody@huawei.com


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   Xian Zhang
   Huawei Technologies

   Email: zhang.xian@huawei.com

   Aihua Guo
   ADVA
   Email: AGuo@advaoptical.com

   Victor Lopez
   Telefonica
   Email: victor.lopezalvarez@telefonica.com

   Daniel King
   University of Lancaster
   Email: d.king@lancaster.ac.uk

   Bin Yeong Yoon
   ETRI
   218 Gaijeongro, Yuseong-gu
   Daejeon, Korea
   Email: byyun@etri.re.kr




























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