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Versions: (draft-saad-mpls-static-yang) 00 01 02 03 04 05 06 07

MPLS Working Group                                               T. Saad
Internet-Draft                                                   K. Raza
Intended status: Standards Track                               R. Gandhi
Expires: May 8, 2019                                 Cisco Systems, Inc.
                                                                  X. Liu
                                                          Volta Networks
                                                               V. Beeram
                                                        Juniper Networks
                                                                 H. Shah
                                                                   Ciena
                                                              I. Bryskin
                                                     Huawei Technologies
                                                       November 04, 2018


                 A YANG Data Model for MPLS Static LSPs
                     draft-ietf-mpls-static-yang-07

Abstract

   This document contains the specification for the MPLS Static Label
   Switched Paths (LSPs) YANG model.  The model allows for the
   provisioning of static LSP(s) on LER(s) and LSR(s) devices along a
   LSP path without the dependency on any signaling protocol.  The MPLS
   Static LSP model augments the MPLS base YANG model with specific data
   to configure and manage MPLS Static LSP(s).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 8, 2019.








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Copyright Notice

   Copyright (c) 2018 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
   (https://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
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Acronyms and Abbreviations  . . . . . . . . . . . . . . .   3
   2.  MPLS Static LSP Model . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Model Organization  . . . . . . . . . . . . . . . . . . .   4
     2.2.  Model Tree Diagram  . . . . . . . . . . . . . . . . . . .   4
     2.3.  Model Overview  . . . . . . . . . . . . . . . . . . . . .   6
     2.4.  Model YANG Module(s)  . . . . . . . . . . . . . . . . . .   7
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     5.2.  Informative References  . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   This document describes a YANG [RFC7950] data model for configuring
   and managing the Multiprotocol Label Switching (MPLS) [RFC3031]
   Static LSPs.  The model allows the configuration of LER and LSR
   devices with the necessary MPLS cross-connects or bindings to realize
   an end-to-end LSP service.

   A static LSP is established by manually specifying incoming and
   outgoing MPLS label(s) and necessary forwarding information on each
   of the traversed Label Edge Router (LER) and Label Switched Router
   (LSR) devices (ingress, transit, or egress nodes) of the forwarding
   path.

   For example, on an ingress LER device, the model is used to associate
   a specific Forwarding Equivalence Class (FEC) of packets- e.g.



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   matching a specific IP prefix in a Virtual Routing or Forwarding
   (VRF) instance- to an MPLS outgoing label imposition, next-hop(s) and
   respective outgoing interface(s) to forward the packet.  On an LSR
   device, the model is used to create a binding that swaps the incoming
   label with an outgoing label and forwards the packet on one or
   multiple egress path(s).  On an egress LER, it is used to create a
   binding that decapsulates the incoming MPLS label and performs
   forwarding based on the inner MPLS label (if present) or IP
   forwarding in the packet.

   The MPLS Static LSP YANG model is broken into two modules "ietf-mpls-
   static" and "ietf-mpls-static-extended".  The "ietf-mpls-static"
   module covers basic features for the configuration and management of
   unidirectional Static LSP(s), while "ietf-mpls-static-extended"
   covers extended features like the configuration and management of
   bidirectional Static LSP(s) and LSP admission control.

   The module "ietf-mpls-static" augments the MPLS Base YANG model
   defined in module "ietf-mpls" in [I-D.ietf-mpls-base-yang].

1.1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   The terminology for describing YANG data models is found in
   [RFC7950].

1.2.  Acronyms and Abbreviations

      MPLS: Multiprotocol Label Switching

      LSP: Label Switched Path

      LSR: Label Switching Router

      LER: Label Edge Router

      FEC: Forwarding Equivalence Class

      NHLFE: Next Hop Label Forwarding Entry

      ILM: Incoming Label Map





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2.  MPLS Static LSP Model

2.1.  Model Organization

   The base MPLS Static LSP model covers the core features with the
   minimal set of configuration parameters needed to manage and operate
   MPLS Static LSPs.

   Additional MPLS Static LSP parameters as well as optional feature(s)
   are grouped in a separate MPLS Static LSP extended model.  The
   relationship between the MPLS base and other MPLS modules are shown
   in Figure 1.

     Routing module   +---------------+    v: import
                      | ietf-routing  |    o: augment
                      +---------------+
                          o
                          |
                          v
     MPLS base        +-----------+    v: import
     module           | ietf-mpls |    o: augment
                      +-----------+
                         o          o
                         |           \
                         v            v
                 +------------------+ +--------------------+
     MPLS Static | ietf-mpls-static | | ietf-mpls-ldp.yang | . . .
     LSP module  +------------------+ +--------------------+
                             o
                             |
                             v
                    +---------------------------+
    Extended MPLS   | ietf-mpls-static-extended |
    Static LSP      +---------------------------+
    module


                Figure 1: Relationship between MPLS modules

2.2.  Model Tree Diagram

   The MPLS Static and extended LSP tree diagram as per [RFC8340] is
   shown in Figure 2.

module: ietf-mpls-static
  augment /rt:routing/mpls:mpls:
    +--rw static-lsps
       +--rw static-lsp* [name]



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       |  +--rw name           string
       |  +--rw operation?     mpls:mpls-operations-type
       |  +--rw in-segment
       |  |  +--rw fec
       |  |     +--rw (type)?
       |  |     |  +--:(ip-prefix)
       |  |     |  |  +--rw ip-prefix?        inet:ip-prefix
       |  |     |  +--:(mpls-label)
       |  |     |  |  +--rw incoming-label?   rt-types:mpls-label
       |  |     |  +--:(tunnel)
       |  |     |     +--rw tunnel?           te:tunnel-ref
       |  |     +--rw incoming-interface?     if:interface-ref
       |  +--rw out-segment
       |     +--rw (out-segment)?
       |        +--:(nhlfe-single)
       |        |  +--rw nhlfe-single
       |        |     +--rw mpls-label-stack
       |        |     |  +--rw entry* [id]
       |        |     |     +--rw id               uint8
       |        |     |     +--rw label?           rt-types:mpls-label
       |        |     |     +--rw ttl?             uint8
       |        |     |     +--rw traffic-class?   uint8
       |        |     +--rw outgoing-interface?   if:interface-ref
       |        +--:(nhlfe-multiple)
       |           +--rw nhlfe-multiple
       |              +--rw nhlfe* [index]
       |                 +--rw index                 string
       |                 +--rw backup-index?         string
       |                 +--rw loadshare?            uint16
       |                 +--rw role?                 nhlfe-role
       |                 +--rw mpls-label-stack
       |                 |  +--rw entry* [id]
       |                 |     +--rw id              uint8
       |                 |     +--rw label?          rt-types:mpls-label
       |                 |     +--rw ttl?            uint8
       |                 |     +--rw traffic-class?   uint8
       |                 +--rw outgoing-interface?   if:interface-ref
       +--rw mpls-static-ext:bandwidth?            uint32
       +--rw mpls-static-ext:lsp-priority-setup?   uint8
       +--rw mpls-static-ext:lsp-priority-hold?    uint8

module: ietf-mpls-static-extended
  augment /rt:routing/mpls:mpls:
    +--rw bidir-static-lsps
       +--rw bidir-static-lsp* [name]
          +--rw name           string
          +--rw forward-lsp?   mpls-static:static-lsp-ref
          +--rw reverse-lsp?   mpls-static:static-lsp-ref



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                  Figure 2: MPLS Static LSP tree diagram

2.3.  Model Overview

   This document defines two YANG modules for MPLS Static LSP(s)
   configuration and management: ietf-mpls-static.yang and ietf-mpls-
   static-extended.yang.

   The ietf-mpls-static module imports the followinig modules:

   o  ietf-inet-types defined in [RFC6991]

   o  ietf-routing defined in [RFC8349]

   o  ietf-routing-types defined in [RFC8294]

   o  ietf-interfaces defined in [RFC8343]

   o  ietf-mpls defined in [I-D.ietf-mpls-base-yang]

   o  ietf-te defined in [I-D.ietf-teas-yang-te]

   The ietf-mpls-static module contains the following high-level types
   and groupings:

   static-lsp-ref:

      A YANG reference type for a static LSP that can be used by data
      models to reference a configured static LSP.

   in-segment:

      A YANG grouping that describes parameters of an incoming class of
      FEC associated with a specific LSP as described in the MPLS
      architecture document [RFC3031].  The model allows the following
      types of traffic to be mapped onto the static LSP on an ingress
      LER:

           o   Unlabeled traffic destined to a specific prefix
           o   Labeled traffic arriving with a specific label
           o   Traffic carried on a TE tunnel whose LSP is
               statically created via this model.

   out-segment:

      A YANG grouping that describes parameters for the forwarding
      path(s) and their associated attributes for an LSP.  The model
      allows for the following cases:



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          o   single forwarding path or NHLFE
          o   multiple forwarding path(s) or NHLFE(s), each of which can
              serve a primary, backup or both role(s).

   The ietf-mpls-static-extended module imports the followinig modules:

   o  ietf-mpls defined in [I-D.ietf-mpls-base-yang]

   o  ietf-mpls-static defined in this document

   o  ietf-routing defined in [RFC8349]

   The ietf-mpls-static-extended module contains the following high-
   level types and groupings:

   bidir-static-lsp:

      A YANG grouping that describes list of static bidirectional LSPs

   The ietf-mpls-static-extended augments the ietf-mpls-static model
   with additional parameters to configure and manage:

   o  Bidirectional Static LSP(s)

   o  Defining Static LSP bandwidth allocation

   o  Defining Static LSP preemption priorities

2.4.  Model YANG Module(s)

   Configuring LSPs through an LSR/LER involves the following steps:

   o  Enabling MPLS on MPLS capable interfaces.

   o  Configuring in-segments and out-segments on LER(s) and LSR(s)
      traversed by the LSP.

   o  Setting up the cross-connect per LSP to associate segments and/or
      to indicate connection origination and termination.

   o  Optionally specifying label stack actions.

   o  Optionally specifying segment traffic parameters.

   The objects covered by this model are derived from the Incoming Label
   Map (ILM) and Next Hop Label Forwarding Entry (NHLFE) as specified in
   the MPLS architecture document [RFC3031].




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   The MPLS Static LSP and Extended Static LSP modules are shown in
   Figure 3 and Figure 4 below respectively.

 <CODE BEGINS> file "ietf-mpls-static@2018-11-04.yang"
 module ietf-mpls-static {
   yang-version 1.1;
   namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-static";

   prefix "mpls-static";

   import ietf-mpls {
     prefix "mpls";
     reference "draft-ietf-mpls-base-yang: MPLS Base YANG Data Model";
   }

   import ietf-routing {
     prefix "rt";
     reference "RFC8349: A YANG Data Model for Routing Management";
   }

   import ietf-routing-types {
     prefix "rt-types";
     reference "RFC6991: Common YANG Data Types";
   }

   import ietf-inet-types {
     prefix inet;
     reference "RFC6991: Common YANG Data Types";
   }

   import ietf-interfaces {
     prefix "if";
     reference "RFC7223: A YANG Data Model for Interface Management";
   }

   /* Import TE Tunnel */
   import ietf-te {
     prefix te;
     reference "draft-ietf-teas-yang-te: A YANG Data Model for Traffic
                Engineering Tunnels and Interfaces";
   }

   organization "IETF MPLS Working Group";

   contact
     "WG Web:   <http://tools.ietf.org/wg/mpls/>

      WG List:  <mailto:mpls@ietf.org>



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      WG Chair: Loa Andersson
                <mailto:loa@pi.nu>

      WG Chair: Nic Leymann
                <mailto:N.Leymann@telekom.de>

      Editor:   Tarek Saad
                <mailto:tsaad@cisco.com>

      Editor:   Kamran Raza
                <mailto:skraza@cisco.com>

      Editor:   Rakesh Gandhi
                <mailto:rgandhi@cisco.com>

      Editor:   Xufeng Liu
                <mailto: xufeng.liu.ietf@gmail.com>

      Editor:   Vishnu Pavan Beeram
                <mailto:vbeeram@juniper.net>

      Editor:   Himanshu Shah
                <mailto:hshah@ciena.com>

      Editor:   Igor Bryskin
                <mailto: Igor.Bryskin@huawei.com>";

   description
      "This YANG module augments the 'ietf-routing' module with basic
       configuration and operational state data for MPLS static
       The model fully conforms to the Network Management Datastore
       Architecture (NMDA).

       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
       (https://trustee.ietf.org/license-info).
       This version of this YANG module is part of RFC XXXX; see
       the RFC itself for full legal notices.";

   // RFC Ed.: replace XXXX with actual RFC number and remove this
   // note.




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   // RFC Ed.: update the date below with the date of RFC publication
   // and remove this note.

   revision "2018-11-04" {
     description
       "Latest revision:
         - Addressed MPLS-RT review comments";
     reference "RFC XXXX: A YANG Data Model for MPLS Static LSPs";
   }

   typedef static-lsp-ref {
     type leafref {
       path "/rt:routing/mpls:mpls/mpls-static:static-lsps/" +
            "mpls-static:static-lsp/mpls-static:name";
     }
     description
       "This type is used by data models that need to reference
        configured static LSP.";
   }

   grouping in-segment {
     description "In-segment grouping";
     container in-segment {
       description "MPLS incoming segment";
       container fec {
         description "Forwarding Equivalence Class grouping";
         choice type {
           description "FEC type choices";
           case ip-prefix {
             leaf ip-prefix {
               type inet:ip-prefix;
               description "An IP prefix";
             }
           }
           case mpls-label {
             leaf incoming-label {
               type rt-types:mpls-label;
               description "label value on the incoming packet";
             }
           }
           case tunnel {
             leaf tunnel {
               type te:tunnel-ref;
               description "TE tunnel FEC mapping";
             }
           }
         }
         leaf incoming-interface {



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           type if:interface-ref;
           description
             "Optional incoming interface if FEC is restricted
              to traffic incoming on a specific interface";
         }
       }
     }
   }

   grouping out-segment {
     description "Out-segment grouping";
     container out-segment {
       description "MPLS outgoing segment";
       choice out-segment {
         description "The MPLS out-segment type choice";
         case nhlfe-single {
           container nhlfe-single {
             description "Container for single NHLFE entry";
             uses mpls:nhlfe-single-contents;
             leaf outgoing-interface {
               type if:interface-ref;
               description
                 "The outgoing interface";
             }
           }
         }
         case nhlfe-multiple {
           container nhlfe-multiple {
             description "Container for multiple NHLFE entries";
             list nhlfe {
               key index;
               description "MPLS NHLFE entry";
               uses mpls:nhlfe-multiple-contents;
               leaf outgoing-interface {
                 type if:interface-ref;
                 description
                   "The outgoing interface";
               }
             }
           }
         }
       }
     }
   }

   augment "/rt:routing/mpls:mpls" {
     description "Augmentations for MPLS Static LSPs";
     container static-lsps {



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       description
         "Statically configured LSPs, without dynamic signaling";
       list static-lsp {
         key name;
         description "list of defined static LSPs";
         leaf name {
           type string;
           description "name to identify the LSP";
         }
         leaf operation {
           type mpls:mpls-operations-type;
           description
             "The MPLS operation to be executed on the incoming packet";
         }
         uses in-segment;
         uses out-segment;
       }
     }
   }
 }
 <CODE ENDS>

                   Figure 3: MPLS Static LSP YANG module

   The extended MPLS Static LSP module is shown in Figure 4.

<CODE BEGINS> file "ietf-mpls-static-extended@2018-11-04.yang"
module ietf-mpls-static-extended {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended";

  prefix "mpls-static-ext";

  import ietf-mpls {
    prefix "mpls";
    reference "draft-ietf-mpls-base-yang: MPLS Base YANG Data Model";
  }

  import ietf-routing {
    prefix "rt";
    reference "RFC6991: Common YANG Data Types";
  }

  import ietf-mpls-static {
    prefix "mpls-static";
    reference "draft-ietf-mpls-static-yang: A YANG Data Model for MPLS
               Static LSPs";
  }



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  organization "IETF MPLS Working Group";

  contact
    "WG Web:   <http://tools.ietf.org/wg/mpls/>

     WG List:  <mailto:mpls@ietf.org>

     WG Chair: Loa Andersson
               <mailto:loa@pi.nu>

     WG Chair: Nic Leymann
               <mailto:N.Leymann@telekom.de>

     Editor:   Tarek Saad
               <mailto:tsaad@cisco.com>

     Editor:   Kamran Raza
               <mailto:skraza@cisco.com>

     Editor:   Rakesh Gandhi
               <mailto:rgandhi@cisco.com>

     Editor:   Xufeng Liu
               <mailto: xufeng.liu.ietf@gmail.com>

     Editor:   Vishnu Pavan Beeram
               <mailto:vbeeram@juniper.net>

     Editor:   Himanshu Shah
               <mailto:hshah@ciena.com>

     Editor:   Igor Bryskin
               <mailto: Igor.Bryskin@huawei.com>";

  description
    "This YANG module contains the Extended MPLS Static LSP YANG
     data model. The model fully conforms to the Network Management
     Datastore Architecture (NMDA).

     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
     (https://trustee.ietf.org/license-info).



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     This version of this YANG module is part of RFC XXXX; see
     the RFC itself for full legal notices.";

  // RFC Ed.: replace XXXX with actual RFC number and remove this
  // note.

  // RFC Ed.: update the date below with the date of RFC publication
  // and remove this note.

  revision "2018-11-04" {
    description "Latest revision of MPLS extended yang module.";
    reference "RFC XXXX: Extended YANG Data Model for MPLS Static LSPs";
  }

  grouping bidir-static-lsp {
    description
      "grouping for top level list of static bidirectional LSPs";
    leaf forward-lsp {
      type mpls-static:static-lsp-ref;
      description
        "Reference to a configured static forward LSP";
    }
    leaf reverse-lsp {
      type mpls-static:static-lsp-ref;
      description
        "Reference to a configured static reverse LSP";
    }
  }

  augment "/rt:routing/mpls:mpls/mpls-static:static-lsps" {
    description
      "Augmentation for static MPLS LSPs";

    leaf bandwidth {
      type uint32;
      units mbps;
      description
        "Bandwidth in Mbps, e.g., using offline calculation";
    }
    leaf lsp-priority-setup {
      type uint8 {
        range "0..7";
      }
      description "LSP setup priority";
    }
    leaf lsp-priority-hold {
      type uint8 {
        range "0..7";



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      }
      description "LSP hold priority";
    }
  }

  augment "/rt:routing/mpls:mpls" {
    description "Augmentations for MPLS Static LSPs";
    container bidir-static-lsps {
      description
        "Statically configured bidirectional LSPs";
      list bidir-static-lsp {
        key name;
        description "List of static bidirectional LSPs";

        leaf name {
          type string;
          description "Name that identifies the bidirectional LSP";
        }
        uses bidir-static-lsp;
      }
    }
  }
}
<CODE ENDS>

              Figure 4: Extended MPLS Static LSP YANG module

3.  IANA Considerations

   This document registers the following URIs in the IETF XML registry
   [RFC3688].  Following the format in [RFC3688], the following
   registration is requested to be made.

      URI: urn:ietf:params:xml:ns:yang:ietf-mpls-static
      Registrant Contact: The MPLS WG of the IETF.
      XML: N/A, the requested URI is an XML namespace.

      URI: urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended
      Registrant Contact: The MPLS WG of the IETF.
      XML: N/A, the requested URI is an XML namespace.


   This document registers two YANG modules in the YANG Module Names
   registry [RFC6020].







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      name:       ietf-mpls-static
      namespace:  urn:ietf:params:xml:ns:yang:ietf-mpls-static
      prefix:     ietf-mpls-static
      // RFC Ed.: replace XXXX with RFC number and remove this note
      reference:  RFCXXXX

      name:       ietf-mpls-static-extended
      namespace:  urn:ietf:params:xml:ns:yang:ietf-mpls-static-extended
      prefix:     ietf-mpls-static-extended
      // RFC Ed.: replace XXXX with RFC number and remove this note
      reference:  RFCXXXX

4.  Security Considerations

   The YANG module defined in this document is designed to be accessed
   via the NETCONF protocol [RFC6241].  The lowest NETCONF layer is the
   secure transport layer and the mandatory-to-implement secure
   transport is SSH [RFC6242].  The NETCONF access control model
   [RFC8341] provides means to restrict access for particular NETCONF
   users to a pre-configured subset of all available NETCONF protocol
   operations and content.

   There are certain objects or data nodes that are defined in this YANG
   module which are writable/creatable/deletable and that can be
   considered sensitive or vulnerable in some network environments.
   Specifically, misconfiguration or manipulations of objects or data
   node(s) defined in this model, including: in-segment(s), out-
   segment(s) and their associated parameters that collectively allow
   the provisioning of MPLS LSP(s) and associated parameters on a LSR
   can potentially have disastrous results.

5.  References

5.1.  Normative References

   [I-D.ietf-mpls-base-yang]
              Saad, T., Raza, K., Gandhi, R., Liu, X., and V. Beeram, "A
              YANG Data Model for MPLS Base", draft-ietf-mpls-base-
              yang-08 (work in progress), October 2018.

   [I-D.ietf-teas-yang-te]
              Saad, T., Gandhi, R., Liu, X., Beeram, V., Shah, H., and
              I. Bryskin, "A YANG Data Model for Traffic Engineering
              Tunnels and Interfaces", draft-ietf-teas-yang-te-17 (work
              in progress), October 2018.






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   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3031]  Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol
              Label Switching Architecture", RFC 3031,
              DOI 10.17487/RFC3031, January 2001,
              <https://www.rfc-editor.org/info/rfc3031>.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <https://www.rfc-editor.org/info/rfc6020>.

   [RFC6241]  Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
              and A. Bierman, Ed., "Network Configuration Protocol
              (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8294]  Liu, X., Qu, Y., Lindem, A., Hopps, C., and L. Berger,
              "Common YANG Data Types for the Routing Area", RFC 8294,
              DOI 10.17487/RFC8294, December 2017,
              <https://www.rfc-editor.org/info/rfc8294>.







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   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <https://www.rfc-editor.org/info/rfc8341>.

   [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
              <https://www.rfc-editor.org/info/rfc8343>.

   [RFC8349]  Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for
              Routing Management (NMDA Version)", RFC 8349,
              DOI 10.17487/RFC8349, March 2018,
              <https://www.rfc-editor.org/info/rfc8349>.

5.2.  Informative References

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

Authors' Addresses

   Tarek Saad
   Cisco Systems, Inc.

   Email: tsaad@cisco.com


   Kamran Raza
   Cisco Systems, Inc.

   Email: skraza@cisco.com


   Rakesh Gandhi
   Cisco Systems, Inc.

   Email: rgandhi@cisco.com


   Xufeng Liu
   Volta Networks

   Email: xufeng.liu.ietf@gmail.com







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   Vishnu Pavan Beeram
   Juniper Networks

   Email: vbeeram@juniper.net


   Himanshu Shah
   Ciena

   Email: hshah@ciena.com


   Igor Bryskin
   Huawei Technologies

   Email: Igor.Bryskin@huawei.com



































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