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Versions: (draft-ding-rtgwg-arp-yang-model) 00 01 02 03

RTGWG                                                           F. Zheng
Internet-Draft                                                B. Wu, Ed.
Intended status: Standards Track                                  Huawei
Expires: May 6, 2020                                      R. Wilton, Ed.
                                                           Cisco Systems
                                                                 X. Ding
                                                        November 3, 2019


                        YANG Data Model for ARP
                   draft-ietf-rtgwg-arp-yang-model-03

Abstract

   This document defines a YANG data model for the management of the
   Address Resolution Protocol (ARP).  It extends the basic ARP
   functionality contained in the ietf-ip YANG data model, defined in
   RFC 8344, to provide management of optional ARP features and
   statistics.

   The YANG data model in this document conforms to the Network
   Management Datastore Architecture defined in RFC 8342.

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 6, 2020.

Copyright Notice

   Copyright (c) 2019 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.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Design of the Data Model  . . . . . . . . . . . . . . . . . .   4
     3.1.  ARP Dynamic Learning  . . . . . . . . . . . . . . . . . .   4
     3.2.  Proxy ARP . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Gratuitous ARP  . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  ARP Data Model  . . . . . . . . . . . . . . . . . . . . .   5
   4.  ARP YANG Module . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Data Model Examples . . . . . . . . . . . . . . . . . . . . .  11
     5.1.  Configured static ARP Entry . . . . . . . . . . . . . . .  11
     5.2.  Configuration of proxy ARP and gratuitous ARP . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Basic ARP functionality is supported by the ietf-ip YANG data model,
   defined in [RFC8344].  This document defines a YANG [RFC7950] data
   model that extends the basic ARP YANG support to also cover optional
   ARP features, and ARP related statistics to aid network monitoring
   and troubleshooting.

   This model defines YANG configuration and operational state data
   nodes both for ARP related functionality formally specified in other
   RFCs (such as [RFC8344] and [RFC1027]), but also for common ARP
   behaviour that is often supported on network devices.

   Where necessary, the expected behaviour of the YANG data nodes is
   defined in the YANG model, and this document.

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



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   Editorial Note: (To be removed by RFC Editor)

   This draft contains several placeholder values that need to be
   replaced with finalized values at the time of publication.  Please
   apply the following replacements:

   o  "XXXX" --> the assigned RFC value for this draft both in this
      draft and in the YANG models under the revision statement.

   o  The "revision" date in model, in the format XXXX-XX-XX, needs to
      be updated with the date the draft gets approved.  The date also
      needs to get reflected on the line with <CODE BEGINS>.

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 following terms are defined in [RFC8342] and are not redefined
   here:

   o  client

   o  server

   o  configuration data

   o  system state

   o  state data

   o  intended configuration

   o  running configuration datastore

   o  operational state datastore

   The following terms are defined in [RFC7950] and are not redefined
   here:

   o  augment

   o  data model

   o  data node



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

1.2.  Tree Diagrams

   Tree diagrams used in this document follow the notation defined in
   [RFC8340]

2.  Problem Statement

   Neither ARP [RFC0826], nor Proxy-ARP [RFC1027], define standard
   network management configuration models.  Instead, network equipment
   vendors have implemented their own bespoke configuration interfaces
   and models.

   Network operators benefit from having common network management
   models defined that can be implemented by multiple network equipment
   manufacturers.  This simplifies the operation and management of
   network devices.

   Some, but not all, required ARP functionality has been defined in
   ietf-ip.yang ([RFC8344]).  Providing a standard YANG model that
   models these optional ARP features, that are fairly widely
   implemented by network equipment manufacturers , and used by network
   operators, is beneficial to the general goal of interoperability in
   the networking industry.

3.  Design of the Data Model

   This data model intends to describe the processing that a protocol
   finds the hardware address, also known as Media Access Control (MAC)
   address, of a host from its known IP address.  These tasks include,
   but are not limited to, configuring dynamic ARP learning, proxy ARP,
   gratuitous ARP.  There are two kind of ARP configurations: global ARP
   configuration, which is across all interfaces on the device, and per
   interface ARP configuration.

3.1.  ARP Dynamic Learning

   As defined in [RFC0826], ARP caching is the method of storing network
   addresses and the associated data-link addresses in memory for a
   period of time as the addresses are learned.  This minimizes the use
   of valuable network resources to broadcast for the same address each
   time a datagram is sent.

   There are static ARP cache entries and dynamic ARP cache entries.
   Static entries, are manually configured and kept in the cache table
   on a permanent basis which are defined in the ipv4 neighbor list for



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   each interface in [RFC8344].  Dynamic entries are added by vendor
   software, kept for a period of time, and then removed.  We can
   specify how long an entry remains in the ARP cache.  If we specify a
   timeout of 0 seconds, entries are never cleared from the ARP cache.

3.2.  Proxy ARP

   Proxy ARP, defined in [RFC1027], allows a router to respond to ARP
   requests on behalf of another machine that is not on the same local
   subnet, offering its own Ethernet media access control (MAC) address.
   By replying in such a way, the router then takes responsibility for
   routing packets to the intended destination.

   In the case of certain data center network virtualization, as
   specified in [RFC8014], the proxy ARP can be extended to intercept
   all ARP requests, including source and target IP addresses in
   different subnets, and those ARP requests in the same subnet to
   suppress ARP handling.

3.3.  Gratuitous ARP

   Gratuitous ARP enables a device to send an ARP Request packet using
   its own IP address as the destination address.  Gratuitous ARP
   provides the following functions:

   o  Checks duplicate IP addresses: [RFC5227] uses gratuitous ARP to
      help detect IP conflicts.  When a device receives an ARP request
      containing a source IP that matches its own, then it knows there
      is an IP conflict.

   o  Advertises a new MAC address: Also in [RFC5227], if the MAC
      address of a host changes because its network adapter is replaced,
      the host sends a gratuitous ARP packet to notify all hosts of the
      change before the ARP entry is aged out.

   o  Notifies an active/standby switchover in a [RFC5798] VRRP backup
      group: After an active/standby switchover, the master router sends
      a gratuitous ARP packet in the VRRP backup group to notify the
      switchover.

3.4.  ARP Data Model

   This document defines the YANG module "ietf-arp", which has the
   following structure:







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   module: ietf-arp
     +--rw arp
        +--rw dynamic-learning?   boolean

     augment /if:interfaces/if:interface/ip:ipv4:
       +--rw arp
          +--rw expiry-time?        uint32
          +--rw dynamic-learning?   boolean
          +--rw proxy-arp
          |  +--rw mode?   enumeration
          +--rw gratuitous-arp
          |  +--rw enable?     boolean
          |  +--rw interval?   uint32
          +--ro statistics
             +--ro in-requests-pkts?      yang:counter32
             +--ro in-replies-pkts?       yang:counter32
             +--ro in-gratuitous-pkts?    yang:counter32
             +--ro out-requests-pkts?     yang:counter32
             +--ro out-replies-pkts?      yang:counter32
             +--ro out-gratuitous-pkts?   yang:counter32
     augment /if:interfaces/if:interface/ip:ipv4/ip:neighbor:
       +--ro remaining-expiry-time?   uint32

4.  ARP YANG Module

   This section presents the ARP YANG module defined in this document.

   This module imports definitions from Common YANG Data Types
   [RFC6991], A YANG Data Model for Interface Management [RFC8343], and
   A YANG Data Model for IP Management [RFC8344].

   <CODE BEGINS> file "ietf-arp@2019-11-04.yang"

   module ietf-arp {
     yang-version 1.1;
     namespace "urn:ietf:params:xml:ns:yang:ietf-arp";
     prefix arp;

     import ietf-yang-types {
       prefix yang;
       reference "RFC 6991: Common YANG Data Types";
     }
     import ietf-interfaces {
       prefix if;
       reference "RFC 8343: A Yang Data Model for Interface Management";
     }
     import ietf-ip {
       prefix ip;



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       reference "RFC 8344: A Yang Data Model for IP Management";
     }

     organization
       "IETF Routing Area Working Group (rtgwg)";
     contact
       "WG Web: <http://tools.ietf.org/wg/rtgwg/>
        WG List: <mailto: rtgwg@ietf.org>
        Author: Feng Zheng
            habby.zheng@huawei.com
        Editor: Bo Wu
            lana.wubo@huawei.com
        Editor: Robert Wilton
            rwilton@cisco.com
        Author: Xiaojian Ding
            wjswsl@163.com";
     description
       "Address Resolution Protocol (ARP) management, which includes
        static ARP configuration, dynamic ARP learning, ARP entry query,
        and packet statistics collection.

        Copyright (c) 2019 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).

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

     revision 2019-11-04 {
       description
         "Init revision";
       reference "RFC XXXX: A Yang Data Model for ARP";
     }

     container arp {
       description
         "Address Resolution Protocol (ARP)";
       leaf dynamic-learning {
         type boolean;
         default "true";
         description
           "Controls the default ARP learning behavior on all



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            interfaces on the device, unless explicit overridden by
            the per-interface dynamic-learning leaf:
              true -  dynamic learning is enabled on all interfaces by
                      default,
              false - dynamic learning is disabled on all interfaces by
                      default";
         reference "RFC826: An Ethernet Address Resolution Protocol";
       }
     }
     augment "/if:interfaces/if:interface/ip:ipv4" {
       description
         "Augment interfaces with ARP configuration and state.";
       container arp {
         description
           "Address Resolution Protocol (ARP) related configuration
            and state";
         leaf expiry-time {
           type uint32 {
             range "30..86400";
           }
           units "seconds";
           description
             "Aging time of a received dynamic ARP entry before it is
              removed from the cache.";
         }
         leaf dynamic-learning {
           type boolean;
           description
             "Controls whether dynamic ARP learning is enabled on the
              interface.  If not configured, it defaults to the behavior
              specified in the per-device /arp/dynamic-learning leaf.

                true -  dynamic learning is enabled
                false - dynamic learning is disabled";
         }
         container proxy-arp {
           description
             "Configuration parameters for proxy ARP";
           leaf mode {
             type enumeration {
               enum disabled {
                 description
                   "The system only responds to ARP requests that
                    specify a target address configured on the local
                    interface.";
               }
               enum remote-only {
                 description



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                   "The system only responds to ARP requests when the
                    sender and target IP addresses are in different
                    subnets.";
               }
               enum all {
                 description
                   "The system responds to ARP requests where the sender
                    and target IP addresses are in different subnets, as
                    well as those where they are in the same subnet.";
               }
             }
             default "disabled";
             description
               "When set to a value other than 'disable', the local
                system should respond to ARP requests that are for
                target addresses other than those that are configured on
                the local subinterface using its own MAC address as the
                target hardware address.  If the 'remote-only' value is
                specified, replies are only sent when the target address
                falls outside the locally configured subnets on the
                interface, whereas with the 'all' value, all requests,
                regardless of their target address are replied to.";
             reference
               "RFC1027: Using ARP to Implement Transparent Subnet
                Gateways";
           }
         }
         container gratuitous-arp {
           description "Configure gratuitous ARP.";
           reference "RFC5227: IPv4 Address Conflict Detection";
           leaf enable {
             type boolean;
             description
               "Enable or disable sending gratuitous ARP packet on the
                interface.

                The default behaviour is device specific, and a
                deviation could used to to specify a device specific
                default.";
           }
           leaf interval {
             type uint32 {
               range "1..86400";
             }
             units "seconds";
             description
               "The interval, in seconds, between sending gratuitous ARP
                packet on the interface.



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                The default behaviour is device specific, and a
                deviation could used to to specify a device specific
                default.";
           }
         }
         container statistics {
           config false;
           description
             "ARP per-interface packet statistics

              For all ARP interface counters, discontinuities in the
              value can occur at re-initialization of the management
              system and at other times as indicated by the value of
              '../../statistics/discontinuity-time' in the
              ietf-interfaces YANG module.";

           leaf in-requests-pkts {
             type yang:counter32;
             description
               "The number of ARP request packets received on this
                interface.";
           }

           leaf in-replies-pkts {
             type yang:counter32;
             description
               "The number of ARP reply packets received on this
                interface.";
           }

           leaf in-gratuitous-pkts {
             type yang:counter32;
             description
               "The number of gratuitous ARP packets received on this
                interface.";
           }

           leaf out-requests-pkts {
             type yang:counter32;
             description
               "The number of ARP request packets sent on this
                interface.";
           }

           leaf out-replies-pkts {
             type yang:counter32;
             description
               "The number of ARP reply packets sent on this



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                interface.";
           }

           leaf out-gratuitous-pkts {
             type yang:counter32;
             description
               "The number of gratuitous ARP packets sent on this
                interface.";
           }
         }
       }
     }

     augment "/if:interfaces/if:interface/ip:ipv4/ip:neighbor" {
       description
         "Augment IPv4 neighbor list with ARP expiry time.";
       leaf remaining-expiry-time {
         type uint32;
         units "seconds";
         config false;
         description
           "The number of seconds until the dynamic ARP entry expires
            and is removed from the ARP cache.";
       }
     }
   }

5.  Data Model Examples

   This section presents two simple ARP configuration examples:

5.1.  Configured static ARP Entry

   This example illustrates the configuration for a static ARP entry for
   peer 192.0.2.1 with MAC address 00:00:5E:00:53:AB using the model
   defined in [RFC8344].















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   <?xml version="1.0" encoding="utf-8"?>
   <interfaces
       xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"
       xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">
     <interface>
       <name>eth0</name>
       <type>ianaift:ethernetCsmacd</type>
       <!-- other parameters from ietf-interfaces omitted -->

       <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
         <!-- ipv4 address configuration parameters omitted -->
         <neighbor>
           <ip>192.0.2.1</ip>
           <link-layer-address>00:00:5E:00:53:AB</link-layer-address>
         </neighbor>
       </ipv4>
     </interface>
   </interfaces>

5.2.  Configuration of proxy ARP and gratuitous ARP

   This example illustrates the configuration of ARP entry expiry time,
   proxy ARP in 'remote-only' mode, and enabling gratuitous ARP with an
   interval of 10 minutes.



























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   <?xml version="1.0" encoding="utf-8"?>
   <interfaces
       xmlns="urn:ietf:params:xml:ns:yang:ietf-interfaces"
       xmlns:ianaift="urn:ietf:params:xml:ns:yang:iana-if-type">
     <interface>
       <name>eth0</name>
       <type>ianaift:ethernetCsmacd</type>
       <!-- other parameters from ietf-interfaces omitted -->

       <ipv4 xmlns="urn:ietf:params:xml:ns:yang:ietf-ip">
         <!-- ipv4 address configuration parameters omitted -->
         <arp xmlns="urn:ietf:params:xml:ns:yang:ietf-arp">
           <expiry-time>1200</expiry-time>
           <proxy-arp>
             <mode>remote-only</mode>
           </proxy-arp>
           <gratuitous-arp>
             <enable>true</enable>
             <interval>600</interval>
           </gratuitous-arp>
         </arp>
       </ipv4>
     </interface>
   </interfaces>

6.  IANA Considerations

   This document registers a URI 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-arp
       Registrant Contact: The RTGWG 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-arp
       Namespace: urn:ietf:params:xml:ns:yang:ietf-arp
       Prefix: arp
       Reference: RFC XXXX

7.  Security Considerations

   The YANG module specified in this document defines a schema for data
   that is designed to be accessed via network management protocols such
   as NETCONF [RFC6241] or RESTCONF [RFC8040] .  The lowest NETCONF



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   layer is the secure transport layer, and the mandatory-to-implement
   secure transport is Secure Shell (SSH) [RFC6242].  The lowest
   RESTCONF layer 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..

   There are a number of data nodes defined in this YANG module that are
   writable/creatable/deletable (i.e., config true, which is the
   default).  These data nodes may be considered sensitive or vulnerable
   in some network environments.  Write operations (e.g., edit-config)
   to these data nodes without proper protection can have a negative
   effect on network operations.These are the subtrees and data nodes
   and their sensitivity/vulnerability:

      arp/dynamic-learning: This leaf is used to enable ARP dynamic
      learning on all interfaces.  ARP dynamic learning could allow an
      attacker to inject spoofed traffic into the network, e.g. denial-
      of-service attack.

      interface/ipv4/arp/proxy-arp: These leaves are used to enable
      proxy ARP on an interface.  They could allow traffic to be mis-
      configured (denial-of-service attack).

      interface/ipv4/arp/gratuitous-arp: These leaves are used to enable
      sending gratuitous ARP packet on an interface.  This configuration
      could allow an attacker to inject spoofed traffic into the
      network, e.g. man-in-the-middle attack.  The default value for
      this data node is device specific, and hence users of this model
      MUST understand whether or not gratutious ARP is enabled and
      whether this could constitute a security risk.

8.  Acknowledgments

   The authors wish to thank Alex Campbell, Reshad Rahman, Qin Wu, Tom
   Petch, Jeffrey Haas, and others for their helpful comments.

9.  References

9.1.  Normative References








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   [RFC0826]  Plummer, D., "An Ethernet Address Resolution Protocol: Or
              Converting Network Protocol Addresses to 48.bit Ethernet
              Address for Transmission on Ethernet Hardware", STD 37,
              RFC 826, DOI 10.17487/RFC0826, November 1982,
              <https://www.rfc-editor.org/info/rfc826>.

   [RFC1027]  Carl-Mitchell, S. and J. Quarterman, "Using ARP to
              implement transparent subnet gateways", RFC 1027,
              DOI 10.17487/RFC1027, October 1987,
              <https://www.rfc-editor.org/info/rfc1027>.

   [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>.

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

   [RFC5227]  Cheshire, S., "IPv4 Address Conflict Detection", RFC 5227,
              DOI 10.17487/RFC5227, July 2008,
              <https://www.rfc-editor.org/info/rfc5227>.

   [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>.

   [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>.







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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>.

   [RFC8344]  Bjorklund, M., "A YANG Data Model for IP Management",
              RFC 8344, DOI 10.17487/RFC8344, March 2018,
              <https://www.rfc-editor.org/info/rfc8344>.

   [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>.

9.2.  Informative References

   [RFC5798]  Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP)
              Version 3 for IPv4 and IPv6", RFC 5798,
              DOI 10.17487/RFC5798, March 2010,
              <https://www.rfc-editor.org/info/rfc5798>.

   [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>.

   [RFC8014]  Black, D., Hudson, J., Kreeger, L., Lasserre, M., and T.
              Narten, "An Architecture for Data-Center Network
              Virtualization over Layer 3 (NVO3)", RFC 8014,
              DOI 10.17487/RFC8014, December 2016,
              <https://www.rfc-editor.org/info/rfc8014>.

   [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>.

   [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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Authors' Addresses

   Feng Zheng
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: habby.zheng@huawei.com


   Bo Wu (editor)
   Huawei

   Email: lana.wubo@huawei.com


   Robert Wilton (editor)
   Cisco Systems

   Email: rwilton@cisco.com


   Xiaojian Ding

   Email: wjswsl@163.com

























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