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Versions: (draft-saad-mpls-base-yang) 00 01 02 03 04 05 06 07 08 09

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
                                                       November 04, 2018


                    A YANG Data Model for MPLS Base
                      draft-ietf-mpls-base-yang-09

Abstract

   This document contains a specification of the the MPLS base YANG
   model.  The MPLS base YANG model serves as a base framework for
   configuring and managing an MPLS switching subsystem on an MPLS-
   enabled router.  It is expected that other MPLS YANG models (e.g.
   MPLS LSP Static, LDP or RSVP-TE YANG models) will augment the MPLS
   base YANG model.

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.

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



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   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 Base Model . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Model Overview  . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Model Organization  . . . . . . . . . . . . . . . . . . .   4
     2.3.  Model Tree Diagram  . . . . . . . . . . . . . . . . . . .   5
     2.4.  Model YANG Module . . . . . . . . . . . . . . . . . . . .   7
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   5.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  16
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  16
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

1.  Introduction

   A core routing data model is defined in [RFC8349], and it provides a
   basis for the development of data models for routing protocols.  The
   MPLS base model augments core routing data model with additional data
   specific to MPLS technology as described in the MPLS architecture
   document [RFC3031].

   The MPLS base model serves as a basis for future development of MPLS
   data models covering more-sophisticated MPLS feauture(s) and sub-
   system(s).  The main purpose is to provide essential building blocks
   for the more-complicated data models involving different control-
   plane protocols, and advanced MPLS functions.

   To this end, it is expected that the MPLS base data model will be
   augmented by a number of other modules developed at IETF (e.g. by
   TEAS and MPLS working groups).

   The YANG module in this document conforms to the Network Management
   Datastore Architecture (NMDA) [RFC8342].







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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

      RIB: Routing Information Base

      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

2.  MPLS Base Model

   This document describes the ietf-mpls YANG module that provides base
   components of the MPLS data model.  It is expected that other MPLS
   YANG modules will augment the ietf-mpls base module for other MPLS
   extension to provision LSP(s) (e.g.  MPLS Static, MPLS LDP or MPLS
   RSVP-TE LSP(s)).

2.1.  Model Overview

   This document defines a mechanism to model MPLS labeled routes as an
   augmentation of the the routing RIB data model defined in [RFC8349]
   for IP prefix routes that are MPLS labelled.

   The other MPLS route(s) that are non-IP prefix routes are modelled by
   introducing a new "mpls" address-family RIB as per recommendation .






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2.2.  Model Organization

     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  +-------------------+ +---------------------+

           @: not in this document, shown for illustration only

                Figure 1: Relationship between MPLS modules

   The ietf-mpls module imports the followinig modules:

   o  ietf-routing defined in [RFC8349]

   o  ietf-routing-types defined in [RFC8294]

   o  ietf-interfaces defined in [RFC8343]

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

   label-block-alloc-mode:

      A base YANG identity for supported label block allocation mode(s).

   mpls-operations-type:

      An enumeration type that represents support possible MPLS
      operation types (impose-and-forward, pop-and-forward, pop-impose-
      and-forward, and pop-and-lookup)

   nhlfe-role:

      An enumeration type that represents the role of the NHLFE entry.

   nhlfe-single-contents:



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      A YANG grouping that describes single NHLFE and its associated
      parameters as described in the MPLS architecture document
      [RFC3031].

   nhlfe-multiple-contents:

      A YANG grouping that describes a set of NHLFE(s) and their
      associated parameters as described in the MPLS architecture
      document [RFC3031].

   interface-mpls-properties:

      A YANG grouping that describes the properties of an MPLS interface
      on a device.

   interfaces-mpls:

      A YANG grouping that describes the list of MPLS enabled interfaces
      on a device.

   label-block-properties:

      A YANG grouping that describes the properties of an MPLS label
      block.

   label-blocks:

      A YANG grouping that describes the list of MPLS enabled interfaces
      on a device.

2.3.  Model Tree Diagram

   The MPLS base tree diagram that follows the notation defined in
   [RFC8340] is shown in Figure 2.

module: ietf-mpls
  augment /rt:routing:
    +--rw mpls
       +--rw ttl-propagate?   boolean
       +--rw label-blocks
       |  +--rw label-block* [index]
       |     +--rw index                    string
       |     +--rw start-label?             rt-types:mpls-label
       |     +--rw end-label?               rt-types:mpls-label
       |     +--rw block-allocation-mode?   identityref
       |     +--ro state
       |        +--ro free-labels-count?    uint32
       |        +--ro inuse-labels-count?   uint32



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       +--rw interface* [name]
          +--rw name       if:interface-ref
          +--rw enabled?   boolean
          +--rw mtu?       uint32
  augment /rt:routing/rt:ribs/rt:rib/rt:routes/rt:route:
    +--ro local-label?   rt-types:mpls-label
  augment /rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/rt:next-hop/
  rt:next-hop-options/rt:simple-next-hop:
    +--ro mpls-label-stack
       +--ro entry* [id]
          +--ro id               uint8
          +--ro label?           rt-types:mpls-label
          +--ro ttl?             uint8
          +--ro traffic-class?   uint8
  augment /rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/rt:next-hop/
  rt:next-hop-options/rt:next-hop-list/rt:next-hop-list/rt:next-hop:
    +--ro index?              string
    +--ro backup-index?       string
    +--ro loadshare?          uint16
    +--ro role?               nhlfe-role
    +--ro mpls-label-stack
       +--ro entry* [id]
          +--ro id               uint8
          +--ro label?           rt-types:mpls-label
          +--ro ttl?             uint8
          +--ro traffic-class?   uint8
  augment /rt:routing/rt:ribs/rt:rib/rt:active-route/rt:input:
    +---w local-label?   rt-types:mpls-label
  augment /rt:routing/rt:ribs/rt:rib/rt:active-route/rt:output/rt:route/
  rt:next-hop/rt:next-hop-options/rt:simple-next-hop:
    +-- index?              string
    +-- backup-index?       string
    +-- loadshare?          uint16
    +-- role?               nhlfe-role
    +-- mpls-label-stack
       +-- entry* [id]
          +-- id               uint8
          +-- label?           rt-types:mpls-label
          +-- ttl?             uint8
          +-- traffic-class?   uint8
  augment /rt:routing/rt:ribs/rt:rib/rt:active-route/rt:output/rt:route/
  rt:next-hop/rt:next-hop-options/rt:next-hop-list/rt:next-hop-list/
  rt:next-hop:
    +-- index?              string
    +-- backup-index?       string
    +-- loadshare?          uint16
    +-- role?               nhlfe-role
    +-- mpls-label-stack



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       +-- entry* [id]
          +-- id               uint8
          +-- label?           rt-types:mpls-label
          +-- ttl?             uint8
          +-- traffic-class?   uint8

                     Figure 2: MPLS Base tree diagram

2.4.  Model YANG Module

   This section describes the "ietf-mpls" YANG module that provides base
   components of the MPLS data model.  Other YANG module(s) may import
   and augment the base MPLS module to add feature specific data.

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

  prefix "mpls";

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

  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>



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     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>";

  description
    "This YANG module defines the essential components for the
     management of the MPLS subsystem. 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.

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

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

  /* Identities */

  identity mpls {



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    base rt:address-family;
    description
      "This identity represents the MPLS address family.";
  }

  identity label-block-alloc-mode {
    description
      "Base identity label-block allocation mode";
  }

  identity label-block-alloc-mode-manager {
    base label-block-alloc-mode;
    description
      "Label block allocation on reserved block
       is managed by label manager";
  }

  identity label-block-alloc-mode-application {
    base label-block-alloc-mode;
    description
      "Label block allocation on reserved block
       is managed by application";
  }

  /**
   * Typedefs
   */
  typedef mpls-operations-type {
    type enumeration {
      enum impose-and-forward {
        description
          "Operation impose outgoing label(s) and forward to
           next-hop";
      }
      enum pop-and-forward {
        description
          "Operation pop incoming label and forward to next-hop";
      }
      enum pop-impose-and-forward {
        description
          "Operation pop incoming label, impose one or more
           outgoing label(s) and forward to next-hop";
      }
      enum swap-and-forward {
        description
          "Operation swap incoming label, with outgoing label and
           forward to next-hop";
      }



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      enum pop-and-lookup {
        description
          "Operation pop incoming label and perform a lookup";
      }
    }
    description "MPLS operations types";
  }

  typedef nhlfe-role {
    type enumeration {
      enum PRIMARY {
        description
          "Next-hop acts as primary traffic carrying";
      }
      enum BACKUP {
        description
          "Next-hop acts as backup";
      }
      enum PRIMARY_AND_BACKUP {
        description
          "Next-hop acts as primary and backup simultaneously";
      }
    }
    description "The next-hop role";
  }

  grouping nhlfe-single-contents {
    description
      "MPLS simple NHLFE contents";
    uses rt-types:mpls-label-stack;
  }

  grouping nhlfe-multiple-contents {
    description
      "MPLS NHLFE contents";
    leaf index {
      type string;
      description
        "A user-specified identifier utilised to uniquely
         reference the next-hop entry in the next-hop list.
         The value of this index has no semantic meaning
         other than for referencing the entry.";
    }

    leaf backup-index {
      type string;
      description
        "A user-specified identifier utilised to uniquely



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         reference the backup next-hop entry in the NHLFE list.
         The value of this index has no semantic meaning
         other than for referencing the entry.";
    }

    leaf loadshare {
      type uint16;
      description
        "This value is used to compute a loadshare to perform un-equal
         load balancing when multiple outgoing next-hop(s) are
         specified. A share is computed as a ratio of this number to the
         total under all next-hops(s).";
    }

    leaf role {
      type nhlfe-role;
      description "NHLFE role";
    }
    uses nhlfe-single-contents;
  }

  grouping interface-mpls-properties {
    description "MPLS interface contents grouping";
    leaf enabled {
      type boolean;
      description
        "'true' if mpls encapsulation is enabled on the
         interface. 'false' if mpls encapsulation is enabled
         on the interface.";
    }
    leaf mtu {
      type uint32;
      description
        "MPLS Maximum Transmission Unit (MTU) in bytes";
    }
  }

  grouping interfaces-mpls {
    description "List of MPLS interfaces";
    list interface {
      key "name";
      description "List of MPLS interfaces";
      leaf name {
        type if:interface-ref;
        description
          "The name of a configured MPLS interface";
      }
      uses interface-mpls-properties;



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    }
  }

  grouping label-block-properties {
    description "Label-block configuration items";
    leaf index {
      type string;
      description
        "A user-specified identifier utilised to uniquely
         reference an MPLS label block";
    }
    leaf start-label {
      type rt-types:mpls-label;
      description "Label-block start";
    }
    leaf end-label {
      type rt-types:mpls-label;
      description "Label-block end";
    }
    leaf block-allocation-mode {
      type identityref {
        base label-block-alloc-mode;
      }
      description "Label-block allocation mode";
    }
  }

  grouping label-block_state {
    description "Label-block state items";
    leaf free-labels-count {
      when "../../block-allocation-mode = " +
      "'label-block-alloc-mode-manager'";
      type uint32;
      description "Label-block free labels count";
    }
    leaf inuse-labels-count {
      when "../../block-allocation-mode = " +
      "'label-block-alloc-mode-manager'";
      type uint32;
      description "Label-block inuse labels count";
    }
  }

  grouping globals {
    description "MPLS global configuration grouping";
    leaf ttl-propagate {
      type boolean;
      default 'true';



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      description "Propagate TTL between IP and MPLS";
    }
  }
  grouping label-blocks {
    description "Label-block allocation grouping";
    container label-blocks {
      description "Label-block allocation container";
      list label-block {
        must "start-label >= end-label" {
          error-message "start-label can not be less than end-label";
        }
        key index;
        unique "start-label end-label";
        description "List of MPLS label-blocks";
        uses label-block-properties;
        container state {
          config false;
          description "Holds state information";
          uses label-block_state;
        }
      }
    }
  }

  augment "/rt:routing" {
    description "MPLS augmentation.";
    container mpls {
      description
        "MPLS container, to be used as an augmentation target node
         other MPLS sub-features config, e.g. MPLS static LSP, MPLS
         LDP LSPs, and Trafic Engineering MPLS LSP Tunnels, etc.";
        uses globals;
        uses label-blocks;
        uses interfaces-mpls;
    }
  }

  /* MPLS routes augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route" {
    when "derived-from-or-self(../../rt:address-family, "
       + "'mpls:mpls')" {
      description
        "This augment is valid only for IPv4 unicast.";
    }
    description
      "This leaf augments an MPLS routes.";
    leaf local-label {
      type rt-types:mpls-label;



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      description
        "MPLS local label.";
    }
  }

  /* MPLS simple-next-hop augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
    when "derived-from-or-self(../../../rt:address-family, "
       + "'mpls:mpls')" {
      description
        "This augment is valid only for IPv4 unicast.";
    }
    description
      "Augment 'simple-next-hop' case in IPv4 unicast routes.";
    uses nhlfe-single-contents;
  }

  /* MPLS next-hop-list augmentation */
  augment "/rt:routing/rt:ribs/rt:rib/rt:routes/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    when "derived-from-or-self(../../../../../rt:address-family, "
       + "'mpls:mpls')" {
      description
        "This augment is valid only for IPv4 unicast.";
    }
    description
      "This leaf augments the 'next-hop-list' case of IPv4 unicast
       routes.";
    uses nhlfe-multiple-contents;
  }

  /* MPLS RPC input augmentation */
  augment
    "/rt:routing/rt:ribs/rt:rib/rt:active-route/rt:input" {
    description
      "This augment adds the input parameter of the 'active-route'
       action.";
    /* uses nhlfe-multiple-contents; */
    leaf local-label {
      type rt-types:mpls-label;
      description
        "MPLS local label.";
    }
  }

  /* MPLS RPC output augmentation */



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  augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
        + "rt:output/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:simple-next-hop" {
    description
      "This augment adds the destination prefix to the reply of the
       'active-route' action.";
    uses nhlfe-multiple-contents;
  }
  augment "/rt:routing/rt:ribs/rt:rib/rt:active-route/"
        + "rt:output/rt:route/"
        + "rt:next-hop/rt:next-hop-options/rt:next-hop-list/"
        + "rt:next-hop-list/rt:next-hop" {
    description
      "This augment adds the destination prefix to the reply of the
       'active-route' action.";
    uses nhlfe-multiple-contents;
  }
}
<CODE ENDS>

                      Figure 3: MPLS base 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
      Registrant Contact: The MPLS WG of the IETF.
      XML: N/A, the requested URI is an XML namespace.

   This document registers a YANG module in the YANG Module Names
   registry [RFC6020].

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

4.  Security Considerations

   The YANG modules specified in this document define a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040].  The lowest NETCONF layer
   is the secure transport layer, and the mandatory-to-implement secure
   transport is Secure Shell (SSH) [RFC6242].  The lowest RESTCONF layer



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   is HTTPS, and the mandatory-to-implement secure transport is TLS
   [RFC8446].

   The NETCONF access control model [RFC8341] provides the means to
   restrict access for particular NETCONF or RESTCONF users to a
   preconfigured subset of all available NETCONF or RESTCONF protocol
   operations and content.

   Some of the readable data nodes in these YANG modules may be
   considered sensitive or vulnerable in some network environments.  It
   is thus important to control read access (e.g., via get, get-config,
   or notification) to these data nodes.  These are the subtrees and
   data nodes and their sensitivity/vulnerability:

   /rt:routing/rt:ribs/rt:rib/rt:active-route/rt:output/rt:route: this
   path is augmented by additional MPLS leaf(s) defined in this model.
   Access to this information may disclose the per prefix and/or other
   information.

   /rt:routing/rt:ribs/rt:rib/rt:active-route/rt:output/rt:route/
   rt:next-hop/rt:next-hop-options/rt:simple-next-hop: this path is
   augmented by additional MPLS leaf(s) defined in this model.  Access
   to this information may disclose the next-hop or path per prefix and/
   or other information.

5.  Acknowledgement

   The authors would like to thank the members of the multi-vendor YANG
   design team who are involved in the definition of this model.

6.  Contributors

      Igor Bryskin
      Huawei Technologies
      email: Igor.Bryskin@huawei.com


      Himanshu Shah
      Ciena
      email: hshah@ciena.com


7.  Normative References

   [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>.



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   [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>.

   [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>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

   [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>.

   [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>.

   [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>.



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   [RFC8342]  Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
              and R. Wilton, "Network Management Datastore Architecture
              (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018,
              <https://www.rfc-editor.org/info/rfc8342>.

   [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>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

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


   Vishnu Pavan Beeram
   Juniper Networks

   Email: vbeeram@juniper.net



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