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Versions: 00 01                                                         
INTERNET-DRAFT                                             S.Baillargeon
Intended Status: Standards Track                                Ericsson
Expires: October 29, 2015                                 April 27, 2015


          A YANG Data Model for basic IP and ICMP Statistics
                  draft-baill-netmod-yang-ip-stats-01


Abstract

   This document defines a YANG data model for basic IP and ICMP
   statistics for monitoring IPv4 and IPv6 implementations.


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 (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as
   Internet-Drafts.

   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/1id-abstracts.html

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html



Copyright and License Notice

   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



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   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  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Tree Diagrams  . . . . . . . . . . . . . . . . . . . . . .  3
   2  IP Stats Model  . . . . . . . . . . . . . . . . . . . . . . . .  4
   3  Relationship to IP-MIB  . . . . . . . . . . . . . . . . . . . .  8
   4  IP Statistics YANG Module . . . . . . . . . . . . . . . . . . . 11
   5  Security Considerations . . . . . . . . . . . . . . . . . . . . 35
   6  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 35
   7  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 36
     7.1  Normative References  . . . . . . . . . . . . . . . . . . . 36
     7.2  Informative References  . . . . . . . . . . . . . . . . . . 37
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 37






























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1  Introduction

   This document defines a YANG [RFC6020] data model for collecting
   basic IP and ICMP statistics for monitoring IPv4 and IPv6
   implementations.

   The data model defines the following IP layer statistics:

   o  ICMPv4 system statistics

   o  ICMPv6 system statistics

   o  IP interface statistics


1.1  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   The following terms are defined in [RFC6241] and are not redefined
   here:

   o  client

   o  configuration data

   o  server

   o  state data

   o  statistics


   The following terms are defined in [RFC6020] and are not redefined
   here:

   o  augment

   o  data model

   o  data node

   o  presence container


1.2.  Tree Diagrams



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   A simplified graphical representation of the data model is used in
   this document.  The meaning of the symbols in these diagrams is as
   follows:

   o  Brackets "[" and "]" enclose list keys.

   o  Abbreviations before data node names: "rw" means configuration
      data (read-write), and "ro" means state data (read-only).

   o  Symbols after data node names: "?" means an optional node, "!"
      means a presence container, and "*" denotes a list and leaf-list.

   o  Parentheses enclose choice and case nodes, and case nodes are also
      marked with a colon (":").

   o  Ellipsis ("...") stands for contents of subtrees that are not
      shown.

2  IP Stats Model

   This document defines the YANG module "ietf-ip-stats" which provides
   the following IP layer statistics:

   o  ICMPv4 system statistics

   o  ICMPv6 system statistics

   o  IP interface statistics


   The ICMPv4 system statistics are defined in the "icmpv4" container.
   It provides a small set of statistics about ICMPv4 traffic processed
   by the entire system. It is an optional node and it MAY be present
   only if IPv4 is enabled on the system.

   The ICMPv6 system statistics are defined in the "icmpv6" container.
   It provides a small set of statistics about ICMPv6 traffic (including
   MLDv2 [RFC 3810]) processed by the entire system. It is an optional
   node and it MAY be present only if IPv6 is enabled on the system.

   Both the "icmpv4" and "icmpv6" containers are child nodes of the top-
   level "system-stats" container that is intended to hold any system
   wide statistics. The "system-stats" container has the following tree
   structure:







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   +--ro system-stats
         +--ro icmpv4!
         |  +--ro in-msgs?              yang:counter32
         |  +--ro in-errors?            yang:counter32
         |  +--ro in-echo-requests?     yang:counter32
         |  +--ro in-echo-replies?      yang:counter32
         |  +--ro in-dest-unreachs?     yang:counter32
         |  +--ro in-param-problems?    yang:counter32
         |  +--ro in-time-exceeds?      yang:counter32
         |  +--ro in-others?            yang:counter32
         |  +--ro out-msgs?             yang:counter32
         |  +--ro out-errors?           yang:counter32
         |  +--ro out-echo-requests?    yang:counter32
         |  +--ro out-echo-replies?     yang:counter32
         |  +--ro out-dest-unreachs?    yang:counter32
         |  +--ro out-param-problems?   yang:counter32
         |  +--ro out-time-exceeds?     yang:counter32
         |  +--ro out-others?           yang:counter32
         +--ro icmpv6!
            +--ro in-msgs?                 yang:counter32
            +--ro in-errors?               yang:counter32
            +--ro in-echo-requests?        yang:counter32
            +--ro in-echo-replies?         yang:counter32
            +--ro in-dest-unreachs?        yang:counter32
            +--ro in-param-problems?       yang:counter32
            +--ro in-time-exceeds?         yang:counter32
            +--ro in-redirects?            yang:counter32
            +--ro in-pkt-too-bigs?         yang:counter32
            +--ro in-router-solicits?      yang:counter32
            +--ro in-router-adverts?       yang:counter32
            +--ro in-neighbor-solicits?    yang:counter32
            +--ro in-neighbor-adverts?     yang:counter32
            +--ro in-MLDv2-queries?        yang:counter32
            +--ro in-MLDv2-reports?        yang:counter32
            +--ro in-others?               yang:counter32
            +--ro out-msgs?                yang:counter32
            +--ro out-errors?              yang:counter32
            +--ro out-echo-requests?       yang:counter32
            +--ro out-echo-replies?        yang:counter32
            +--ro out-dest-unreachs?       yang:counter32
            +--ro out-param-problems?      yang:counter32
            +--ro out-time-exceeds?        yang:counter32
            +--ro out-redirects?           yang:counter32
            +--ro out-pkt-too-bigs?        yang:counter32
            +--ro out-router-solicits?     yang:counter32
            +--ro out-router-adverts?      yang:counter32
            +--ro out-neighbor-solicits?   yang:counter32
            +--ro out-neighbor-adverts?    yang:counter32



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            +--ro out-MLDv2-queries?       yang:counter32
            +--ro out-MLDv2-reports?       yang:counter32
            +--ro out-others?              yang:counter32


   The IP interface statistics are defined in the "stats" containers
   belongs to a reusable "ip-if-stats" group. Such containers augment
   the YANG IP Management module [RFC 7277] and provide a basic set of
   statistics about IPv4 and IPv6 traffic received on and transmitted by
   an interface. The statistics are for a specific IP address family. Up
   to two separate set of IP statistics are supported per interface, one
   for each IP version. The IP implementation MAY also decides to
   support a single IP version per interface. The interface can be any
   IP capable interface defined in the IANA Interface Type YANG module
   [RFC 7224]. For instance, it can be:

   o  an Ethernet interface (if:type = 'ianaift:ethernetCsmacd')

   o  a link aggregate interface (if:type = 'ianaift:ieee8023adLag')

   o  a L3 IP VLAN interface (if:type = 'ianaift:l3ipvlan')

   o  a loopback interface (if:type = 'ianaift:softwareLoopback')

   The "stats" container is an optional node and it MAY be present only
   if IPv4 and/or IPv6 is enabled on the system. The "stats" containers
   has the following tree structure:

   augment /if:interfaces-state/if:interface/ip:ipv4:
      +--ro stats
         +--ro in-receives?           yang:counter64
         +--ro in-octets?             yang:counter64
         +--ro in-hdr-errors?         yang:counter32
         +--ro in-mcast-pkts?         yang:counter64
         +--ro in-mcast-octets?       yang:counter64
         +--ro in-bcast-pkts?         yang:counter64
         +--ro in-truncates?          yang:counter32
         +--ro in-dest-addr-errors?   yang:counter32
         +--ro in-scr-addr-errors?    yang:counter32
         +--ro in-forwards?           yang:counter64
         +--ro in-no-routes?          yang:counter32
         +--ro in-reasm-requires?     yang:counter64
         +--ro in-reasm-fails?        yang:counter32
         +--ro in-reasm-OKs?          yang:counter64
         +--ro in-unknown-protos?     yang:counter32
         +--ro in-discards?           yang:counter32
         +--ro in-delivers?           yang:counter64
         +--ro out-requests?          yang:counter64



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         +--ro out-no-routes?         yang:counter32
         +--ro out-forwards?          yang:counter64
         +--ro out-frag-requires?     yang:counter64
         +--ro out-frag-fails?        yang:counter32
         +--ro out-frag-OKs?          yang:counter64
         +--ro out-frag-creates?      yang:counter64
         +--ro out-mcast-pkts?        yang:counter64
         +--ro out-mcast-octets?      yang:counter64
         +--ro out-bcast-pkts?        yang:counter64
         +--ro out-discards?          yang:counter32
         +--ro out-transmits?         yang:counter64
         +--ro out-octets?            yang:counter64
   augment /if:interfaces-state/if:interface/ip:ipv6:
      +--ro stats
         +--ro in-receives?           yang:counter64
         +--ro in-octets?             yang:counter64
         +--ro in-hdr-errors?         yang:counter32
         +--ro in-mcast-pkts?         yang:counter64
         +--ro in-mcast-octets?       yang:counter64
         +--ro in-bcast-pkts?         yang:counter64
         +--ro in-truncates?          yang:counter32
         +--ro in-dest-addr-errors?   yang:counter32
         +--ro in-scr-addr-errors?    yang:counter32
         +--ro in-forwards?           yang:counter64
         +--ro in-no-routes?          yang:counter32
         +--ro in-reasm-requires?     yang:counter64
         +--ro in-reasm-fails?        yang:counter32
         +--ro in-reasm-OKs?          yang:counter64
         +--ro in-unknown-protos?     yang:counter32
         +--ro in-discards?           yang:counter32
         +--ro in-delivers?           yang:counter64
         +--ro out-requests?          yang:counter64
         +--ro out-no-routes?         yang:counter32
         +--ro out-forwards?          yang:counter64
         +--ro out-frag-requires?     yang:counter64
         +--ro out-frag-fails?        yang:counter32
         +--ro out-frag-OKs?          yang:counter64
         +--ro out-frag-creates?      yang:counter64
         +--ro out-mcast-pkts?        yang:counter64
         +--ro out-mcast-octets?      yang:counter64
         +--ro out-bcast-pkts?        yang:counter64
         +--ro out-discards?          yang:counter32
         +--ro out-transmits?         yang:counter64
         +--ro out-octets?            yang:counter64







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3  Relationship to IP-MIB

   The IP-MIB defines two ICMP statistic tables: icmpStatsTable and
   icmpMsgStatsTable. The icmpStatsTable contains generic system-wide
   ICMP counters for each IP version. The icmpMsgStatsTable contains
   system-wide per-version, per-message type ICMP counters. The YANG IP
   statistics module aggregates all ICMP statistics into one container
   for each IP version. This module does not individually track all
   possible ICMP type values. It only tracks the most common ICMP types
   for each IP version and aggregate all other ICMP types into a single
   counter.

   The IP-MIB defines two IP statistics tables: ipSystemStatsTable and
   ipIfStatsTable). The ipSystemStatsTable contain objects to count the
   number of packets, fragments, datagrams and octets that a given
   system has processed for each IP version. The ipIfStatsTable contain
   objects to count the number of packets, fragments, datagrams and
   octets that a given interface has received or transmitted for each IP
   version. The data nodes defined in the "ip-if-stats" group
   corresponds to the counters defined in ipIfStatsTable. The system
   wide table ipSystemStatsTable is not defined in this data model.


   The following tables list the YANG data nodes with corresponding
   objects in the IP-MIB.

   +--------------------------------+----------------------------------+
   |YANG data node in               |IP-MIB Object                     |
   |/ip-stats:system-stats          |                                  |
   +--------------------------------+----------------------------------+
   |icmpv4/in-msgs                  |icmpStatsInMsgs                   |
   |icmpv4/in-errors                |icmpStatsInErrors                 |
   |icmpv4/in-echo-requests         |                                  |
   |icmpv4/in-echo-replies          |                                  |
   |icmpv4/in-dest-unreachs         |                                  |
   |icmpv4/in-param-problems        |                                  |
   |icmpv4/in-time-exceeds          |                                  |
   |icmpv4/in-others                |                                  |
   |icmpv4/out-msgs                 |icmpStatsOutMsgs                  |
   |icmpv4/out-errors               |icmpStatsOutErrors                |
   |icmpv4/out-echo-requests        |                                  |
   |icmpv4/out-echo-replies         |                                  |
   |icmpv4/out-dest-unreachs        |                                  |
   |icmpv4/out-param-problems       |                                  |
   |icmpv4/out-time-exceeds         |                                  |
   |icmpv4/out-others               |                                  |
   +--------------------------------+----------------------------------+
             Table 1: YANG ICMPv4 Stats Nodes to IP-MIB Objects



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   +--------------------------------+----------------------------------+
   |YANG data node in               |IP-MIB Object                     |
   |/ip-stats:system-stats          |                                  |
   +--------------------------------+----------------------------------+
   |icmpv6/in-msgs                  |icmpStatsInMsgs                   |
   |icmpv6/in-errors                |icmpStatsInErrors                 |
   |icmpv6/in-echo-requests         |                                  |
   |icmpv6/in-echo-replies          |                                  |
   |icmpv6/in-dest-unreachs         |                                  |
   |icmpv6/in-param-problems        |                                  |
   |icmpv6/in-time-exceeds          |                                  |
   |icmpv6/in-redirects             |                                  |
   |icmpv6/in-pkt-too-bigs          |                                  |
   |icmpv6/in-router-solicits       |                                  |
   |icmpv6/in-router-adverts        |                                  |
   |icmpv6/in-neighbor-solicits     |                                  |
   |icmpv6/in-neighbor-adverts      |                                  |
   |icmpv6/in-MLDv2-queries         |                                  |
   |icmpv6/in-MLDv2-reports         |                                  |
   |icmpv6/in-others                |                                  |
   |icmpv6/out-msgs                 |icmpStatsInMsgs                   |
   |icmpv6/out-errors               |icmpStatsInErrors                 |
   |icmpv6/out-echo-requests        |                                  |
   |icmpv6/out-echo-replies         |                                  |
   |icmpv6/out-dest-unreachs        |                                  |
   |icmpv6/out-param-problems       |                                  |
   |icmpv6/out-time-exceeds         |                                  |
   |icmpv6/out-redirects            |                                  |
   |icmpv6/out-pkt-too-bigs         |                                  |
   |icmpv6/out-router-solicits      |                                  |
   |icmpv6/out-router-adverts       |                                  |
   |icmpv6/out-neighbor-solicits    |                                  |
   |icmpv6/out-neighbor-adverts     |                                  |
   |icmpv6/out-MLDv2-queries        |                                  |
   |icmpv6/out-MLDv2-reports        |                                  |
   +--------------------------------+----------------------------------+
             Table 2: YANG ICMPv6 Stats Nodes to IP-MIB Objects














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   +-------------------------------------+-----------------------------+
   |YANG data node in                    |IP-MIB Object                |
   |/if:interface-state/if:interface     |                             |
   +-------------------------------------+-----------------------------+
   |{ipv4,ipv6}/stats/in-receives        |ipIfStatsHCInReceives        |
   |{ipv4,ipv6}/stats/in-octets          |ipIfStatsHCInOctets          |
   |{ipv4,ipv6}/stats/in-hdr-errors      |ipIfStatsInHdrErrors         |
   |{ipv4,ipv6}/stats/in-mcast-pkts      |ipIfStatsHCInMcastPkts       |
   |{ipv4,ipv6}/stats/in-mcast-octets    |ipIfStatsHCInMcastOctets     |
   |{ipv4,ipv6}/stats/in-bcast-pkts      |ipIfStatsHCInBcastPkts       |
   |{ipv4,ipv6}/stats/in-truncates       |ipIfStatsInTruncatedPkts     |
   |{ipv4,ipv6}/stats/in-dest-addr-errors|ipIfStatsInAddrErrors        |
   |{ipv4,ipv6}/stats/in-scr-addr-errors |                             |
   |{ipv4,ipv6}/stats/in-forwards        |ipIfStatsHCInForwDatagrams   |
   |{ipv4,ipv6}/stats/in-no-routes       |ipIfStatsInNoRoutes          |
   |{ipv4,ipv6}/stats/in-reasm-requires  |ipIfStatsReasmReqds          |
   |{ipv4,ipv6}/stats/in-reasm-fails     |ipIfStatsReasmFails          |
   |{ipv4,ipv6}/stats/in-reasm-OKs       |ipIfStatsReasmOKs            |
   |{ipv4,ipv6}/stats/in-unknown-protos  |ipIfStatsInUnknownProtos     |
   |{ipv4,ipv6}/stats/in-discards        |ipIfStatsInDiscards          |
   |{ipv4,ipv6}/stats/in-delivers        |ipIfStatsHCInDelivers        |
   |{ipv4,ipv6}/stats/out-requests       |ipIfStatsHCOutRequests       |
   |{ipv4,ipv6}/stats/out-no-routes      |                             |
   |{ipv4,ipv6}/stats/out-forwards       |ipIfStatsHCOutForwDatagrams  |
   |{ipv4,ipv6}/stats/out-frag-requires  |ipIfStatsOutFragReqds        |
   |{ipv4,ipv6}/stats/out-frag-fails     |ipIfStatsOutFragFails        |
   |{ipv4,ipv6}/stats/out-frag-OKs       |ipIfStatsOutFragOKs          |
   |{ipv4,ipv6}/stats/out-frag-creates   |ipIfStatsOutFragCreates      |
   |{ipv4,ipv6}/stats/out-mcast-pkts     |ipIfStatsHCOutMcastPkts      |
   |{ipv4,ipv6}/stats/out-mcast-octets   |ipIfStatsHCOutMcastOctets    |
   |{ipv4,ipv6}/stats/out-bcast-pkts     |ipIfStatsHCOutBcastPkts      |
   |{ipv4,ipv6}/stats/out-discards       |ipIfStatsOutDiscards         |
   |{ipv4,ipv6}/stats/out-transmits      |ipIfStatsHCOutTransmits      |
   |{ipv4,ipv6}/stats/out-octets         |ipIfStatsHCOutOctets         |
   +-------------------------------------+-----------------------------+
             Table 3: YANG IP Stats Nodes to IP-MIB Objects















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4  IP Statistics YANG Module

   This module imports typedefs from [RFC6991] and [RFC7223], and it
   references [RFC0791], [RFC0826], [RFC2460], [RFC4861],
   [RFC4862],[RFC4941], and [RFC7217].

   <CODE BEGINS> file "ietf-ip-stats@2015-04-27.yang"

   module ietf-ip-stats {

     namespace "urn:ietf:params:xml:ns:yang:ietf-ip-stats";
     prefix ip-stats;

     import ietf-ip {
     prefix ip;
     }
     import ietf-interfaces {
     prefix if;
     }
     import ietf-yang-types {
     prefix yang;
     }

     organization
       "IETF NETMOD (NETCONF Data Modeling Language) Working Group";

     contact
       "WG Web:   <http://tools.ietf.org/wg/netmod/>
        WG List:  <mailto:netmod@ietf.org>

        WG Chair: Thomas Nadeau
                  <mailto:tnadeau@lucidvision.com>

        WG Chair: Juergen Schoenwaelder
                  <mailto:j.schoenwaelder@jacobs-university.de>

        Editor:   Steve Baillargeon
                  <mailto:steve.baillargeon@ericsson.com>";

     description
       "This YANG module contains a collection of IP and ICMP statistics
        for monitoring IPv4 and IPv6 implementations.

        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



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        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 TBD; see
        the RFC itself for full legal notices.";

     revision 2015-04-27 {
       description
         "Initial revision.";
       reference
         "TBD";
     }

     /*
      * Groupings
      */

     grouping ip-if-stats {
       description
         "A group of IP layer statistics for IP traffic
          received and transmitted by an interface.";

       container stats {
         config false;
          description
           "A collection of IP layer statistics for IP traffic
            received and transmitted by an interface.";


         leaf in-receives {
           type yang:counter64;
           units packets;
           description
             "The number of input IP packets received on the
              interface, including those received in error.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInReceives";
         }

         leaf in-octets {
           type yang:counter64;



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           units octets;
           description
             "The number of octets received in IP packets,
              including those received in error. Octets from packets
              counted in in-receives MUST be counted.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInOctets";
         }

         leaf in-hdr-errors {
           type yang:counter32;
           units packets;
           description
             "The number of input IP packets discarded due to errors
              in their IP headers, including version number mismatch,
              other format errors, hop count exceeded, errors
              discovered in processing their IP options, etc.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInHdrErrors";
         }

         leaf in-mcast-pkts {
           type yang:counter64;
           units packets;
           description
             "The number of input IP multicast packets received on
              the interface.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInMcastPkts";
         }

         leaf in-mcast-octets {
           type yang:counter64;



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           units octets;
           description
             "The number of octets received in IP multicast
              packets. Octets from packets counted in
              /ipv4/in-mcast-pkts MUST be counted.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInMcastOctets";
         }

         leaf in-bcast-pkts {
           type yang:counter64;
           units packets;
           description
             "The number of input IP broadcast packets received on
              the interface.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInBcastPkts";
         }

         leaf in-truncates {
           type yang:counter32;
           units packets;
           description
             "The number of input IP packets discarded because the
              packet didn't carry enough data.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInTruncatedPkts";
         }

         leaf in-dest-addr-errors {
           type yang:counter32;
           units packets;
           description



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             "The number of input IP packets discarded because the IP
              address in their IP header's destination field was not a
              valid address to be received at this system.  For systems
                   that are not IP routers and therefore do not forward packets,
                   this counter includes packets that are discarded because
              the destination address was not a local address.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInAddrErrors";
         }

         leaf in-scr-addr-errors {
           type yang:counter32;
           units packets;
           description
             "The number of input IP packets discarded because the IP
              address in their IP header's source field was not a
              valid address to be received at this system.  This count
              includes source filtering on multicast packets.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInAddrErrors";
         }

         leaf in-forwards {
           type yang:counter64;
           units packets;
           description
             "The number of input IP packets for which this system
              was not their final IP destination and for which this
              system attempted to find a route to forward them to that
              final destination.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInForwDatagrams";
         }



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         leaf in-no-routes {
           type yang:counter32;
           units packets;
           description
             "The number of input IP packets for which this system was
              not their final IP destination and for which this system
              attempted to find a route to forward them to that final
              destination.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInNoRoutes";
         }

         leaf in-reasm-requires {
           type yang:counter64;
           units fragments;
           description
             "The number of input IP fragments received that needed
              to be reassembled at this interface.

              When tracking interface statistics, the counter of the
              interface to which these fragments were addressed is
              incremented.  This interface might not be the same as the
              input interface for some of the fragments.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsReasmReqds";
         }

         leaf in-reasm-fails {
           type yang:counter32;
           units failures;
           description
             "The number of failures detected by the IP re-assembly
              algorithm (for whatever reason: timed out, errors, etc.).
              Note that this is not necessarily a count of discarded IP
              fragments since some algorithms can lose track of the
              number of fragments by combining them as they are
              received.




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              When tracking interface statistics, the counter of the
              interface to which these fragments were addressed is
              incremented.  This interface might not be the same as the
              input interface for some of the fragments.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsReasmFails";
         }

         leaf in-reasm-OKs {
           type yang:counter64;
           units datagrams;
           description
             "The number of input IP datagrams successfully
              reassembled.

              When tracking interface statistics, the counter of the
              interface to which these datagrams were addressed is
              incremented.  This interface might not be the same as the
              input interface for some of the datagrams.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsReasmOKs";
         }

         leaf in-unknown-protos {
           type yang:counter32;
           units datagrams;
           description
             "The number of locally-addressed input IP datagrams
              received successfully but discarded because of an unknown
              or unsupported protocol.

              When tracking interface statistics, the counter of the
              interface to which these datagrams were addressed is
              incremented.  This interface might not be the same as the
              input interface for some of the datagrams.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at



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              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInUnknownProtos";
         }

         leaf in-discards {
           type yang:counter32;
           units datagrams;
           description
             "The number of input IP datagrams for which no problems
              were encountered to prevent their continued processing,
              but were discarded (e.g., for lack of buffer space).
              Note that this counter does not include any datagrams
              discarded while awaiting re-assembly.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsInDiscards";
         }

         leaf in-delivers {
           type yang:counter64;
           units datagrams;
           description
             "The number of input IP datagrams successfully
              delivered to IP user protocols (including ICMP).

              When tracking interface statistics, the counter of the
              interface to which these datagrams were addressed is
              incremented.  This interface might not be the same as the
              input interface for some of the datagrams.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCInDelivers";
         }

         leaf out-requests {
           type yang:counter64;
           units datagrams;
           description



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             "The number of output IP datagrams that local IP user
              protocols (including ICMP) supplied to IP in requests for
              transmission.  Note that this counter does not include any
              datagrams counted out-forwards.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutRequests";
         }

         leaf out-no-routes {
           type yang:counter32;
           units datagrams;
           description
             "The number of locally generated output IP datagrams
              discarded because no route could be found to transmit
              them to their destination.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-forwards {
           type yang:counter64;
           units packets;
           description
             "The number of output IP packets for which this system
              was not their final IP destination and for which it was
              successful in finding a path to their final destination.

              When tracking interface statistics, the counter of the
              outgoing interface is incremented for a successfully
              forwarded packet.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutForwDatagrams";
         }



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         leaf out-frag-requires {
           type yang:counter64;
           units datagrams;
           description
             "The number of output IP datagrams that would require
              fragmentation in order to be transmitted.

              When tracking interface statistics, the counter of the
              outgoing interface is incremented for a successfully
              fragmented datagram.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsOutFragReqds";
         }

         leaf out-frag-fails {
           type yang:counter32;
           units datagrams;
           description
             "The number of output IP datagrams that have been
              discarded because they needed to be fragmented but
              could not be.  This includes IPv4 packets that have
              the DF bit set or IPv6 packets that are being
              forwarded and exceed the outgoing link MTU.

              When tracking interface statistics, the counter of the
              outgoing interface is incremented for a successfully
              fragmented datagram.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsOutFragFails";
         }

         leaf out-frag-OKs {
           type yang:counter64;
           units datagrams;
           description
             "The number of output IP datagrams that have been
              successfully fragmented.




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              When tracking interface statistics, the counter of the
              outgoing interface is incremented for a successfully
              fragmented datagram.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsOutFragOKs";
         }

         leaf out-frag-creates {
           type yang:counter64;
           units fragments;
           description
             "The number of output IP fragments that have been
              generated as a result of IP fragmentation.

              When tracking interface statistics, the counter of the
              outgoing interface is incremented for a successfully
              fragmented datagram.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsOutFragCreates";
         }

         leaf out-mcast-pkts {
           type yang:counter64;
           units packets;
           description
             "The number of output IP multicast packets transmitted
              on the interface.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutMcastPkts";
         }

         leaf out-mcast-octets {
           type yang:counter64;



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           units octets;
           description
             "The number of octets transmitted in IP
              multicast packets. Octets from packets
              counted in /ipv4/out-mcast-pkts MUST be counted.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutMcastOctets";
         }

         leaf out-bcast-pkts {
           type yang:counter64;
           units packets;
           description
             "The number of output IP broadcast packets transmitted
              on the interface.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutBcastPkts";
         }

         leaf out-discards {
           type yang:counter32;
           units packets;
           description
             "The number of output IP packets for which no problem was
              encountered to prevent their transmission to their
              destination, but were discarded (e.g., for lack of
              buffer space).  Note that this counter would include
              datagrams counted in out-forwards if any such
              packets met this (discretionary) discard criterion.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsOutDiscards";
         }




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         leaf out-transmits {
           type yang:counter64;
           units packets;
           description
             "The number of output IP packets that this system
              supplied to the lower layers for transmission.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutTransmits";
         }

         leaf out-octets {
           type yang:counter64;
           units octets;
           description
             "The number of octets in output IP packets delivered
              to the lower layers for transmission. Octets from packets
              counted in out-transmits MUST be counted.

              Discontinuities in the value of this counter can occur
              at re-initialization of the management system, and at
              other times as indicated by the value of
              'discontinuity-time'.";
           reference
             "RFC 4293: The IP MIB - ipIfStatsHCOutOctets";
         }
       }
     }

     /*
      * Data nodes for ICMP statistics for IP-capable system
      */

     container system-stats {
       config false;
       description
         "A collection of system wide statistics";

       container icmpv4 {
          presence
           "Present if IPv4 is enabled on this system";
         description
           "A collection of ICMPv4 layer statistics processed by
             this system.";



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         leaf in-msgs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 messages received by this system.
              Note that this counter includes all those counted by
              /icmpv4/in-errors.";
           reference
             "RFC 4293: The IP MIB - icmpStatsInMsgs";
         }

         leaf in-errors {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 messages that this system received
                   but determined as having ICMP-specific errors (bad ICMP
              checksums, bad length, etc).";
           reference
             "RFC 4293: The IP MIB - icmpStatsInErrors";
         }

         leaf in-echo-requests {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Echo Request messages
              (type 8) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-echo-replies {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Echo Reply messages
              (type 0) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-dest-unreachs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Destination Unreachable messages
              (type 3) received by this system.";



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           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-param-problems {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Parameter Problem messages
              (type 12) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-time-exceeds {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Time Exceeded messages
              (type 11) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-others {
           type yang:counter32;
           units messages;
           description
             "The number of any other ICMPv4 message types
              received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-msgs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 messages this system attempted to
                   send. Note that this counter includes all those counted
                   by /icmpv4/out-errors.";
           reference
             "RFC 4293: The IP MIB - icmpStatsOutMsgs";
         }

         leaf out-errors {
           type yang:counter32;
           units messages;



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           description
             "The number of ICMPv4 messages this system did not send
              due to problems discovered within ICMP, such as a lack of
              buffers. This value should not include errors discovered
              outside the ICMP layer, such as the inability of IP to
                   route the resultant datagram.";
           reference
             "RFC 4293: The IP MIB - icmpStatsOutErrors";
         }

         leaf out-echo-requests {
           type yang:counter32;
           units messages;
           description
              "The number of ICMPv4 Echo Request messages
              (type 8) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-echo-replies {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Echo Reply messages
              (type 0) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-dest-unreachs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Destination Unreachable messages
              (type 3) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-param-problems {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Parameter Problem messages
              (type 12) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";



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         }

         leaf out-time-exceeds {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Time Exceeded messages
              (type 11) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-others {
           type yang:counter32;
           units messages;
           description
             "The number of any other ICMPv4 message types this
              system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }
       }

       container icmpv6 {
          presence
           "Present if IPv6 is enabled on this system";
         description
           "A collection of ICMPv6 layer statistics for ICMPv6 traffic
            processed by this system.";

         leaf in-msgs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 messages received by this system.
              Note that this counter includes all those counted by
              icmpv6/in-errors.";
         reference
           "RFC 4293: The IP MIB - icmpStatsInMsgs";
         }

         leaf in-errors {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 messages that this system received
                   but determined as having ICMP-specific errors (bad ICMP
              checksums, bad length, etc).";



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           reference
             "RFC 4293: The IP MIB - icmpStatsInErrors";
         }

         leaf in-echo-requests {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Echo Request messages
              (type 128) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-echo-replies {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Echo Reply messages
              (type 129) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-dest-unreachs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Destination Unreachable messages
              (type 1) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-param-problems {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Parameter Problem messages
              (type 4) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-time-exceeds {
           type yang:counter32;
           units messages;
           description



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             "The number of ICMPv6 Time Exceeded messages
              (type 3) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-redirects {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Redirect messages
              (type 137) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-pkt-too-bigs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Packet Too Big messages
              (type 2) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-router-solicits {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Router Solicit messages
              (type 133) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-router-adverts {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv4 Router Advertisement messages
              (type 134) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-neighbor-solicits {
           type yang:counter32;



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           units messages;
           description
             "The number of ICMPv6 Neighbor Solicit messages
              (type 135) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-neighbor-adverts {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Neighbor Advertisement messages
              (type 136) received by this system.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf in-MLDv2-queries {
           type yang:counter32;
           units messages;
           description
             "The number of Multicast Listener Discovery version 2
              Query messages(type 130 with length equal or greater
              than 28 bytes) received by this system.";
           reference
             "RFC 3810: MLDv2 for IPv6";
         }

         leaf in-MLDv2-reports {
           type yang:counter32;
           units messages;
           description
             "The number of Multicast Listener Discovery version 2
              Report messages(type 143) received by this system.";
           reference
             "RFC 3810: MLDv2 for IPv6";
         }

         leaf in-others {
            type yang:counter32;
           units messages;
           description
             "The number of any other ICMPv6 message types received
              by this system.";
           reference
            "RFC 4293: The IP MIB";
         }



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         leaf out-msgs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 messages this system attempted to
                   send. Note that this counter includes all those counted
                   by /icmpv6/out-errors.";
           reference
             "RFC 4293: The IP MIB - icmpStatsInMsgs";
         }

         leaf out-errors {
           type yang:counter32;
           units messages;
           description
              "The number of ICMPv6 messages that this system received
                   but determined as having ICMP-specific errors (bad ICMP
              checksums, bad length, etc).";
           reference
             "RFC 4293: The IP MIB - icmpStatsInErrors";
         }

         leaf out-echo-requests {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Echo Request messages
              (type 128) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-echo-replies {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Echo Reply messages
              (type 129) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-dest-unreachs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Destination Unreachable messages
              (type 1) this system attempted to send.";



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           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-param-problems {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Parameter Problem messages
              (type 4) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-time-exceeds {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Time Exceeded messages
              (type 3) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-redirects {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Redirect messages
              (type 137) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-pkt-too-bigs {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Packet Too Big messages
              (type 2) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-router-solicits {
           type yang:counter32;
           units messages;
           description



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             "The number of ICMPv6 Router Solicit messages
              (type 133) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-router-adverts {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Router Advertisement messages
              (type 134) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-neighbor-solicits {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Neighbor Solicit messages
              (type 135) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-neighbor-adverts {
           type yang:counter32;
           units messages;
           description
             "The number of ICMPv6 Neighbor Advertisement messages
              (type 136) this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }

         leaf out-MLDv2-queries {
           type yang:counter32;
           units messages;
           description
             "The number of Multicast Listener Discovery version 2
              Query messages(type 130 with length equal or greater
              than 28 bytes) this system attempted to send.";
           reference
             "RFC 3810: MLDv2 for IPv6";
         }

         leaf out-MLDv2-reports {



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           type yang:counter32;
           units messages;
           description
             "The number of Multicast Listener Discovery version 2
              Report messages(type 143) this system attempted to send.";
           reference
             "RFC 3810: MLDv2 for IPv6";
         }

         leaf out-others {
           type yang:counter32;
           units messages;
           description
             "The number of any other ICMPv6 message types
              this system attempted to send.";
           reference
             "RFC 4293: The IP MIB";
         }
       }
     }
     /*
      * Data nodes for IP statistics for IPv4-capable interface
      */

     augment "/if:interfaces-state/if:interface/ip:ipv4" {
       description
         "Data nodes for statistics about IPv4 traffic on an
          interface when IPv4 is enabled on that interface.

          The interface can be any IPv4-capable interface including
          an Ethernet interface, a link aggregate (LAG) interface,
          a L3 IP VLAN interface and a loopback interface.";

       uses ip-if-stats;
     }

     /*
      * Data nodes for IP statistics for IPv6-capable interface
      */

     augment "/if:interfaces-state/if:interface/ip:ipv6" {
       description
         "Data nodes for statistics about IPv6 traffic on an
          interface when IPv6 is enabled on that interface.

          The interface can be any IPv6-capable interface including
          an Ethernet interface, a link aggregate (LAG) interface,
          a L3 IP VLAN interface and a loopback interface.";



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       uses ip-if-stats;
     }
   }

   <CODE ENDS>




5  Security Considerations

   The YANG module defined in this memo 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
   [RFC6536] provides the means to restrict access for particular
   NETCONF users to a pre-configured subset of all available NETCONF
   protocol operations and content.

   There are a number of data nodes defined in the YANG module which are
   readable IP statistics (read-only counters) with config false
   statement. Even though these data nodes are generally not considered
   sensitive or vulnerable, it may be desirable to limit the number of
   interfaces with IP statistic collection in some network environments.
   These are the subtrees and data nodes and their
   sensitivity/vulnerability:

   {ipv4|ipv6}/stats: These leafs are used to collect IP statistics
   about a specific interface. Enabling or collecting IP statistics on
   all IP capable interfaces on an system may have a negative impact on
   its performance or data storage capacity. The IP statistics may also
   contain sensitive operational information about the usage of the
   network.



6  IANA Considerations

   This document registers a URI in the "IETF XML Registry" [RFC3688].
   Following the format in RFC 3688, the following registration has been
   made.

       URI: urn:ietf:params:xml:ns:yang:ietf-ip-stats

       Registrant Contact: The NETMOD WG of the IETF.

       XML: N/A; the requested URI is an XML namespace.




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

    Name:         ietf-ip-stats
    Namespace:    urn:ietf:params:xml:ns:yang:ietf-ip-stats
    Prefix:       ip-stats
    Reference:    RFC XXXX

7  References

7.1  Normative References

   [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791, September
              1981.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              September 2007.

   [RFC3810]  Vida, R., Costa, L., "Multicast Listener Discovery
              Version 2 (MLDv2) for IPv6", RFC 3810, June 2004.

   [RFC6020]  Bjorklund, M., "YANG - A Data Modeling Language for the
              Network Configuration Protocol (NETCONF)", RFC 6020,
              October 2010.

   [RFC6241]  Enns, R., Bjorklund, M., Schoenwaelder, J., and A.
              Bierman, "Network Configuration Protocol (NETCONF)", RFC
              6241, June 2011.

   [RFC6991]  Schoenwaelder, J., "Common YANG Data Types", RFC 6991,
              July 2013.

   [RFC7223]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 7223, May 2014.

   [RFC7277]  Bjorklund, M., "A YANG Data Model for IP Management", RFC
              7277, June 2014.

   [XML]      Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E., and
              F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fifth
              Edition)", W3C Recommendation, November 2008,



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              <http://www.w3.org/TR/xml/>.


7.2  Informative References

   [RFC7224]  Bjorklund, M., "IANA Interface Type YANG Module", RFC
              7224, May 2014.

   [RFC4293]  Routhier, S., "Management Information Base for the
              Protocol (IP)", RFC 4293, April 2006.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, June 2011.


Authors' Addresses


   Steve Baillargeon
   349 Terry Fox Drive
   Kanata, Ontario, K2K 2V6
   Canada

   EMail: steve.baillargeon@ericsson.com



























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