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Versions: (draft-johnson-ipfix-mib-variable-export) 00 01 02 03 04 05 06 07 08 09 10 RFC 8038

Internet Engineering Task Force (IETF)                    P. Aitken, Ed.
Internet-Draft                      Brocade Communications Systems, Inc.
Intended status: Standards Track                               B. Claise
Expires: May 24, 2016                                             S. B S
                                                     Cisco Systems, Inc.
                                                             C. McDowall
                                    Brocade Communications Systems, Inc.
                                                        J. Schoenwaelder
                                                Jacobs University Bremen
                                                       November 21, 2015


            Exporting MIB Variables using the IPFIX Protocol
                draft-ietf-ipfix-mib-variable-export-10

Abstract

   This document specifies a way to complement IPFIX Data Records with
   Management Information Base (MIB) objects, avoiding the need to
   define new IPFIX Information Elements for existing Management
   Information Base objects that are already fully specified.

   An IPFIX Options Template and method are specified, which are used to
   export the extra information required to fully describe Simple
   Network Management Protocol (SNMP) MIB objects in IPFIX.

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 http://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 24, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.




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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  High Level Solution Overview  . . . . . . . . . . . . . . . .   7
   5.  MIB Object Value Information Elements and the MIB Field
       Options Template  . . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  MIB Field Options Architecture  . . . . . . . . . . . . .   9
     5.2.  IPFIX and MIB Data Model  . . . . . . . . . . . . . . . .  12
     5.3.  MIB Field Options - Specifications and Required Fields  .  13
       5.3.1.  MIB Field Options Template  . . . . . . . . . . . . .  14
       5.3.2.  MIB Type Options Template . . . . . . . . . . . . . .  14
     5.4.  MIB Field Options Template Formats  . . . . . . . . . . .  15
       5.4.1.  Data Template containing a mibObject Field  . . . . .  15
       5.4.2.  MIB Field Options Template  . . . . . . . . . . . . .  16
       5.4.3.  MIB Field Options Data Records  . . . . . . . . . . .  18
       5.4.4.  Options Template containing a mibObject Field . . . .  19
       5.4.5.  MIB Field Options Template with Semantics Fields  . .  20
       5.4.6.  MIB Field Options Template with extra MIB Object
               Details . . . . . . . . . . . . . . . . . . . . . . .  21
     5.5.  Use of field order in the MIB Field Option template . . .  24
     5.6.  Identifying the SNMP Context  . . . . . . . . . . . . . .  24
     5.7.  Template Management . . . . . . . . . . . . . . . . . . .  25
       5.7.1.  Large Messages  . . . . . . . . . . . . . . . . . . .  25
       5.7.2.  Template Withdrawal and Reuse . . . . . . . . . . . .  26
     5.8.  Exporting Conceptual Rows and Tables  . . . . . . . . . .  26
       5.8.1.  Exporting Conceptual Rows - indexing  . . . . . . . .  26
       5.8.2.  Exporting Conceptual Rows - mibObjectValueRow . . . .  27
       5.8.3.  Exporting Conceptual Rows - Augments  . . . . . . . .  33
       5.8.4.  Exporting Conceptual Tables - mibObjectValueTable . .  34
       5.8.5.  Exporting Columnar Objects - using mibIndexIndicator   35
   6.  Example Use Cases . . . . . . . . . . . . . . . . . . . . . .  36
     6.1.  Non Columnar MIB Object: Established TCP Connections  . .  37
     6.2.  Enterprise Specific MIB Object: Detailing CPU Load
           History . . . . . . . . . . . . . . . . . . . . . . . . .  40
     6.3.  Exporting a Conceptual Row: The OSPF Neighbor Row . . . .  43
     6.4.  Exporting Augmented Conceptual Row: The IF-MIB id to name



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           mapping . . . . . . . . . . . . . . . . . . . . . . . . .  47
     6.5.  Exporting a Columnar Object: The ipIfStatsInForwDatagrams  51
     6.6.  Exporting a Columnar Object indexed by IEs: ifOutQLen . .  55
     6.7.  Exporting With Multiple Contexts: The OSPF Neighbor Row
           Revisited . . . . . . . . . . . . . . . . . . . . . . . .  59
   7.  Configuration Considerations  . . . . . . . . . . . . . . . .  62
   8.  The Collecting Process's Side . . . . . . . . . . . . . . . .  62
   9.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .  63
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  63
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  64
     11.1.  New IPFIX Semantics  . . . . . . . . . . . . . . . . . .  64
       11.1.1.  snmpCounter  . . . . . . . . . . . . . . . . . . . .  64
       11.1.2.  snmpGauge  . . . . . . . . . . . . . . . . . . . . .  64
     11.2.  New IPFIX Information Elements . . . . . . . . . . . . .  65
       11.2.1.  New MIB Value Information Elements . . . . . . . . .  65
       11.2.2.  New MIB Field Options Information Elements . . . . .  71
       11.2.3.  New MIB Type Information Elements  . . . . . . . . .  75
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  76
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  76
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  76
     13.2.  Informative References . . . . . . . . . . . . . . . . .  78
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  79

1.  Introduction

   There is growing interest in using IPFIX as a push mechanism for
   exporting management information.  Using a push protocol such as
   IPFIX instead of a polling protocol like SNMP is especially
   interesting in situations where large chunks of repetitive data need
   to be exported periodically.

   While initially targeted at different problems, there is a large
   parallel between the information transported via IPFIX and SNMP.
   Furthermore, certain Management Information Base (MIB) objects are
   highly relevant to flows as they are understood today.  For example,
   in the IPFIX information model [IANA-IPFIX], Information Elements
   coming from the SNMP world have already been specified, e.g.,
   ingressInterface and egressInterface both refer to the ifIndex
   defined in [RFC2863].

   In particular the Management Information Base was designed as a
   separate system of definitions which opens up the possibility of
   exporting Objects defined via the MIB over other protocols.

   Rather than mapping existing MIB objects to IPFIX Information
   Elements on a case by case basis, it would be advantageous to enable
   the export of any existing or future MIB objects as part of an IPFIX
   Data Record.  This way, the duplication of data models [RFC3444],



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   both as SMIv2 MIB objects and IPFIX Information Elements, out of the
   same information model [RFC3444] would be avoided.

   Therefore the primary goals of this document are:

   o  to specify a way to complement IPFIX Data Records with Management
      Information Base (MIB) objects;

   o  to avoid the need to define new IPFIX Information Elements for
      existing Management Information Base objects that are already
      fully specified;

   o  to allow the correlation of SNMP and IPFIX sourced data by
      exporting them together;

   o  to allow SNMP push data from SNMP-only devices to be more easily
      integrated into IPFIX based collection infrastructures.

2.  Motivation

   The intended scope of this work is the addition of MIB variable(s) to
   IPFIX Information Elements in Data Records, in order to complement
   the Records with useful and already standardized information.
   Special consideration is given to the case of an existing Template
   Record which needs to be augmented with some MIB variables whose
   index is already present in the Template Record as an IPFIX
   Information Element.  For example a 7-tuple Record containing the
   ingressInterface Information Element, which needs to be augmented by
   interface counters [RFC2863] which are indexed by the respective
   ingressInterface values which are already contained in the Data
   Records.  See Section 3 for terminology definitions.

   Many Data Records contain the ingressInterface and/or the
   egressInterface Information Elements.  These Information Elements
   carry an ifIndex value, a MIB object defined in [RFC2863].  In order
   to retrieve additional information about the identified interface, a
   Collector could simply poll relevant objects from the device running
   the Exporter via SNMP.  However, that approach has several problems:

   o  It requires implementing a mediation function between two data
      models, i.e., MIB objects and IPFIX Information Elements.

   o  Confirming the validity of simple mappings (e.g., ifIndex to
      ifName) requires either checking on a regular basis that the
      Exporter's network management system did not reload, or imposing
      ifIndex persistence across an Exporter's reload.





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   o  Synchronization problems occur since counters carried in Data
      Records and counters carried in SNMP messages are retrieved from
      the Exporter at different points in time and thus cannot be
      correlated.  In the best case, assuming very tight integration of
      an IPFIX Collector with an SNMP polling engine, SNMP data is
      retrieved shortly after Data Records have been received, which
      implies a delay of the sum of the active or inactive timeouts (if
      not null) plus the time to export the Data Record to the
      Collector.  If, however, the SNMP data is retrieved by a generic
      Network Management Station (NMS) polling interface statistics,
      then the time lag between IPFIX counters and SNMP counters can be
      significantly higher.  See [RFC5470] section 5.1.1.  "Flow
      Expiration" for details of active and inactive timeouts.

   This document does not specify how to carry SNMP notifications in
   IPFIX, even if the specifications in this document could potentially
   allow this.

   Since IPFIX is a push mechanism, initiated from the Exporter with no
   acknowledgment method, this specification does not provide the
   ability to execute configuration changes.

   The Distributed Management Expression MIB [RFC2982], which is a
   mechanism to create new MIB variables based on the content of
   existing ones, could also be advantageous in the context of this
   specification.  Indeed, newly created MIB objects (for example, the
   link utilization MIB variable), created with the Distributed
   Management Expression MIB [RFC2982] could nicely complement Data
   Records.

   Another advantage of exporting MIB objects via IPFIX is that IPFIX
   would benefit from an extended series of types to be exported.  The
   simple and application-wide data types specified in SMIv2 [RFC2578],
   along with new Textual Conventions, can be exported within IPFIX and
   then decoded in the Collector.  However, since a Textual Convention
   can contain almost any name, this document does not extend the
   existing informationElementDataType registry [IANA-IPFIX].

   The overall architectural model is depicted in Figure 1.  The IPFIX
   Exporter accesses the device's instrumentation, which follows the
   specifications contained in MIB modules.  Other management interfaces
   such as NETCONF or the device's Command Line Interface (CLI) may
   provide access to the same instrumentation.








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                +------+  +-------+  +.........+  +.....+
                | SNMP |  | IPFIX |  : NETCONF :  : CLI :
                +------+  +-------+  +.........+  +.....+
                    |         |           |          |
              +--------------------------------------------+
              | Instrumentation (specified in MIB modules) |
              +--------------------------------------------+

                       Figure 1: Architectural Model

3.  Terminology

   IPFIX-specific terminology (Information Element, Template, Template
   Record, Options Template Record, Template Set, Collector, Exporter,
   Data Record, etc.) used in this document is defined in Section 2 of
   [RFC7011].  As in [RFC7011], these IPFIX-specific terms have the
   first letter of a word capitalized.

   This document prefers the more generic term "Data Record" (as opposed
   to "Flow Record") in relation to the export of MIB objects.

   Object Identifier (MIB OID)

      An Object Identifier value is an ordered list of non-negative
      numbers.  For the SMIv2, each number in the list is referred to as
      a sub-identifier.  There are at most 128 sub-identifiers in a
      value, and each sub-identifier has a maximum value of 2^32 - 1
      (4294967295 decimal).  See [RFC2578] Section 3.5.

   MIB Object Identifier Information Element

      An IPFIX Information Element ("mibObjectIdentifier") which denotes
      that a MIB Object Identifier (MIB OID) is exported in the
      (Options) Data Record.  See Section 11.2.2.1.

   SMIv2 Terminology

      The key words "MIB Module", "MIB Object", "INDEX", "AUGMENTS",
      "textual convention", "columnar object", "conceptual row", and
      "conceptual table" in this document are to be interpreted as
      described in SMIv2 [RFC2578]

   SMIv2 SYNTAX

      The SYNTAX key words "INTEGER", "Integer32", "OCTET STRING",
      "OBJECT IDENTIFIER", "BITS construct", "IpAddress", "Counter32",
      "Gauge32", "TimeTicks", "Opaque", "Counter64", "Unsigned32",




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      "SEQUENCE", and "SEQUENCE OF" in this document are to be
      interpreted as described in SMIv2 [RFC2578].

   SNMP Context Terminology

      The key words "snmpEngineID", "contextEngineID", and "contextName"
      in this document are to be interpreted as described in [RFC3411]

   mibObjectValue Information Elements

      Refers to any and all of the mibObjectValue Information Elements
      generically.  Any restriction or requirement in this document that
      refers to mibObjectValue applies to the following Information
      Elements defined in Section 11.2.1: mibObjectValueInteger,
      mibObjectValueOctetString, mibObjectValueOID,
      mibObjectValueIPAddress, mibObjectValueBITS,
      mibObjectValueCounter, mibObjectValueGauge,
      mibObjectValueTimeTicks, mibObjectValueUnsigned,
      mibObjectValueTable, and mibObjectValueRow.

   IE

      Used as a shorthand for "Information Element" [RFC7011] in the
      figures.

   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
   [RFC2119].

4.  High Level Solution Overview

   This document specifies a method for creating IPFIX Options Templates
   that are used to export the extra data required to describe MIB
   variables (see Section 5.1).

   This allows IPFIX Templates to contain any combination of fields
   defined by traditional IPFIX Information Element(s) and/or MIB Object
   Identifier(s).  The MIB Object Identifiers can reference either non-
   columnar or columnar MIB object(s).  Enterprise-specific MIB Object
   Identifiers are also supported.

   This document also defines two standard IPFIX Options Templates (see
   Section 5.3) that are used as part of the mechanism to export MIB
   object meta data:

   o  MIB Field Options Template (Section 5.3.1)




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   o  MIB Type Options Template (Section 5.3.2)

   This document defines three classes of new IPFIX Information
   Elements.  These are used to export values from the MIB, export
   required Object Identifier information, and optionally export type
   data from a MIB Module:

   o  MIB Object Value Information Elements (Section 11.2.1)

   o  MIB Field Options Information Elements (Section 11.2.2)

   o  MIB Type Information Information Elements (Section 11.2.3)

   Additionally, this document defines two new IPFIX semantics which are
   required for the new Information Elements:

   o  snmpCounter (Section 11.1.1)

   o  snmpGauge (Section 11.1.2)

   Two common types defined in the SMIv2 are conceptual rows and
   conceptual tables.  It is desirable that exporting a complete or
   partial conceptual row is simple and efficient.  This is accomplished
   by using IPFIX Structured Data [RFC6313] to reduce repetition of
   Object Identifier and indexing data.

   To allow the use of individual columnar objects that make up a
   conceptual row, a method is also specified to detail that a MIB
   object is indexed by other fields in the same Data Flow.  For an
   individually indexed mibObjectValue the INDEX fields are sent as any
   of the other fields in the same Record, and may be mibObjectValue
   Information Element(s) or other existing Information Element(s).

   Also, in some cases Exporters may not want (or be able) to export the
   full information on how the MIB objects being exported are indexed.
   This may be because the MIB object is being used purely as type
   information or the Exporting Process may not have knowledge of the
   indexing required.  Therefore providing index information for
   Columnar Objects is optional.

5.  MIB Object Value Information Elements and the MIB Field Options
    Template

   This document defines new mibObjectValue Information Elements (in
   Section 11.2.1).  These are used to export MIB objects as part of
   standard IPFIX Templates.  The mibObjectValue Information Elements
   contain the actual data values.




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   The Metering or Exporting Process may extract the data values for
   mibObjectValue Information Elements from a Process that resides on
   the same device or may capture or create the data required to match
   the definition of the MIB object.  In particular exporting a value of
   a MIB object defined in a certain MIB module does not imply that the
   SNMP process on the device supports that MIB module.

   The main issue that arises from exporting values of MIB objects in
   IPFIX is that MIB Object Identifiers do not fit into the standard
   IPFIX Template format [RFC7011], as this only provides a 16-bit
   Information Element identifier.

   The values of a MIB object could be exported using a MIB specific
   Information Element without providing any Object Identifiers.
   However, without exporting the actual MIB OID the full type of the
   data would be unknown and every Field containing MIB object data
   would appear identical.  Without knowing which OID the contents of a
   field map to, the data would be incomprehensible to a Collector.

   For the values in the mibObjectValue Information Elements to be
   understandable, more meta information about the mibObjectValue
   Information Elements must be sent as part of the IPFIX export.  The
   required minimum to understand each field is the OID as defined in
   Section 5.3.1.

   One approach to this problem would be to extend the IPFIX standard to
   allow extended field specifiers so metadata about fields can be
   included in Data Templates.  This would however require a new version
   of the IPFIX standard which may not be backwards compatible.
   However, future versions of IPFIX may export the required MIB
   metadata as part of newly defined IPFIX Set versions.

   This document defines a MIB Field Options Template to export the
   extra meta information required for mibObjectValue Information
   Elements.  This is a standard IPFIX Options Template Set which
   includes a minimum set of required fields (see Section 5.3.1) and may
   include extra fields to provide more meta information about one of
   the mibObjectValue Information Elements.

   The MIB Field Options export is used to tell the Collecting process:
   for the following (template, field) the MIB Object type definition
   has this OID.

5.1.  MIB Field Options Architecture

   Four IPFIX Sets are used together to export a Flow which contains
   mibObjectValue Information Elements.  These are:




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   1.  A Template Set which includes the mibObjectValue Information
       Element.

          The Template Set informs the Collector that a MIB object value
          of length N will be exported.  This Set may also be an Options
          Template Set.

   2.  A MIB Field Options Template Set

          The MIB Field Options Template describes which metadata will
          be sent for each mibObjectValue Information Element being
          exported.

   3.  A MIB Field Options Data Set

          The MIB Field Options Data Set includes the metadata for each
          MIB object (i.e., the mibObjectIdentifier or
          mibSubIdentifier).  The metadata about the mibObjectValue
          Information Elements only needs to be resent as per normal
          Template refreshes or resends.

   4.  A Data Set.

          The Data Set contains only the actual data extracted from the
          MIB or described by the MIB module.

   Figure 2 shows the IPFIX Message structure for a MIB Field in a
   Template Set.

         +-------------------------------------------------------+
         | IPFIX Message Header                                  |
         +-------------------------------------------------------+
         | Template Set         (A)                              |
         +-------------------------------------------------------+
         | Options Template Set (B) (MIB Field Options Template) |
         +-------------------------------------------------------+
         | Data Set             (B) (MIB Field Options Data)     |
         +-------------------------------------------------------+
         | Data Set             (A)                              |
         +-------------------------------------------------------+

    Figure 2: IPFIX Message structure for a MIB Field in a Template Set

   The MIB Field Options Template defines MIB Field Options Data
   Records.  The MIB Field Options Data Records annotate the Data
   Template with mibObjectValue metadata.  Together the Data Template
   and MIB Field Options Data Records define the Data Records that will
   be exported.



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   The Data Records (A) have a dependency on the two Templates and the
   MIB Field Options Data Records.

   More Data Sets that use the same mibObjectValue Information Element
   can then be send in subsequent packets.

   Figure 3 shows the relationships between the Sets discussed above.

                                        +------------------------------+
                                        |MIB Field Options Template (B)|
                                        +------------------------------+
                                        |(templateId, elementIndex)    |
                                        +------------------------------+
                                        |        mibOID                |
                                        +------------------------------+
                                                     |
                                                     | Defines
                                                     V
    +------------------------+              +--------------------------+
    |    Data Template (A)   |              |MIB Field Options Data (B)|
    +------------------------+              +--------------------------+
    |Field 0 - regular IE    |              |                          |
    +------------------------+              +--------------------------+
    |Field 1-mibObjectValue  | <----------- | (X,1) =  OID             |
    +------------------------+   Annotates  +--------------------------+
    |Field 2-mibObjectValue  | <----------- | (X,2) =  OID             |
    +------------------------+              +--------------------------+
                |                                    |
                |------------------------------------/
                |
                | Defines
                |
                V
    +------------------------+
    |    Data Records  (A)   |
    |------------------------|
    | Field 0 data           |
    +------------------------+
    | Field 1 data           |
    +------------------------+
    | Field 2 data           |
    +------------------------+

                   Figure 3: Relationships between Sets







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5.2.  IPFIX and MIB Data Model

   [RFC2578] specifies that the SYNTAX clause for a MIB object defines
   the abstract data structure of an Object and what it must contain:

   "The data structure must be one of the following: a base type, the
   BITS construct, or a textual convention.  (SEQUENCE OF and SEQUENCE
   are also possible for conceptual tables, see section 7.1.12)."  (From
   [RFC2578] section 7.1).

   For each of the SYNTAX clause options this document specifies exactly
   which mibObjectValue Information Element to use.

   If a MIB object to be exported is a Textual Convention, the
   definition of the Textual Convention must be consulted and the SYNTAX
   clause used to determine the correct base type.  This may recurse if
   the Textual Convention is defined in terms of another Textual
   Convention but this should end at a base type.

   If the SYNTAX clause contains a Textual Convention or Subtyping the
   mibObjectSyntax Information Element SHOULD be used to export this
   detail to the Collecting Process.

   The Options for the SYNTAX are then mapped as follows:

   +-----------------+---------------------+---------------------------+
   | RFC2578 Section | SYNTAX              | mibObjectValue IE         |
   +-----------------+---------------------+---------------------------+
   | 7.1.1           | INTEGER/Integer32   | mibObjectValueInteger     |
   | 7.1.2           | OCTET STRING        | mibObjectValueOctetString |
   | 7.1.3           | OBJECT IDENTIFIER   | mibObjectValueOID         |
   | 7.1.4           | The BITS construct  | mibObjectValueBits        |
   | 7.1.5           | IpAddress           | mibObjectValueIPAddress   |
   | 7.1.6           | Counter32           | mibObjectValueCounter     |
   | 7.1.7           | Gauge32             | mibObjectValueGauge       |
   | 7.1.8           | TimeTicks           | mibObjectValueTimeTicks   |
   | 7.1.9           | Opaque              | mibObjectValueOctetString |
   | 7.1.10          | Counter64           | mibObjectValueCounter     |
   | 7.1.11          | Unsigned32          | mibObjectValueUnsigned    |
   | 7.1.12          | SEQUENCE            | mibObjectValueRow or      |
   |                 |                     | mibObjectValueTable       |
   +-----------------+---------------------+---------------------------+

               Table 1: SMIv2 SYNTAX to mibObjectValue types

   Values are encoded as per the standard IPFIX encoding of Abstract
   Data Types.  The only new encoding reference in this document is that




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   Object Identifiers (OID) will be encoded as per ASN.1/BER [BER] in an
   octetArray.

   The mibObjectValue and mibObjectIdentifier Information Elements are
   standard IPFIX fields.  Therefore the E bit of the mibObjectValue or
   mibObjectIdentifier Information Elements is set to "0".

   The MIB object being exported may be defined in an enterprise-
   specific MIB module but the Information Elements defined in this
   standard are still exported with the E bit set to "0".  The OID
   exported encodes that the MIB object was defined in a enterprise-
   specific MIB Module.

5.3.  MIB Field Options - Specifications and Required Fields

   For each mibObjectValue Information Element that is defined in an
   IPFIX Template, a MIB Field Options Data Record will be exported that
   provides the required minimum information to define the MIB object
   that is being exported (see Section 5.3.1).

   The MIB Field Options Data Records are defined in a template referred
   to in this document as a MIB Field Options Template with the format
   specified in Section 5.4.

   The MIB Field Options Template and MIB Field Options Data Records
   MUST be exported in the same IPFIX Message as any Template that is
   using a mibObjectValue Information Element.  Note that this places an
   implicit size constraint on the export.

   This whole set of Templates and MIB Field Options Data Records MUST
   all be exported prior to the corresponding Data Records which depend
   upon them.  i.e., the export order MUST be:

   1.  Data Template for mibObjectValue Information Elements (Set ID 2)

   2.  MIB Field Options Template (Set ID 3)

   3.  MIB Field Options Data Records (Set ID >= 256)

   4.  MIB Object Value Data Records (Set ID >= 256)

   Note that the ID of an identical MIB Field Options Template which has
   already been exported MAY be reused without exporting the Template
   again.

   IPFIX Set IDs are defined in section 3.3.2 of [RFC7011].  A value of
   2 indicates a Template Set, a value of 3 indicates an Options
   Template Set, and values 256 and above indicate Data Sets.



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5.3.1.  MIB Field Options Template

   Three fields are REQUIRED to unambiguously export a standalone
   mibObjectValue Information Element with a MIB Field Options Template:

   o  (scope) templateId [IANA-IPFIX]

   o  (scope) informationElementIndex [IANA-IPFIX]

   o  mibObjectIdentifier (Section 11.2.2.1) or mibSubIdentifier
      (Section 11.2.2.2)

   These are the minimum fields required in a MIB Field Options Template
   (see Section 5.4.2).

   The mibObjectIdentifier is used to provide the OID for all
   mibObjectValue Information Elements exported except for when
   Structured Data is being used to export a conceptual row (see
   Section 5.8.2).

   While the following are optional, they are nevertheless RECOMMENDED
   in certain circumstances as described in the referenced sections:

   o  mibCaptureTimeSemantics
      (discussed in Section 5.4.5; IE defined in Section 11.2.2.4)

   o  mibIndexIndicator
      (discussed in Section 5.8.5; IE defined in Section 11.2.2.3)

   o  mibContextEngineID
      (discussed in Section 5.6; IE defined in Section 11.2.2.5)

   o  mibContextName
      (discussed in Section 5.6; IE defined in Section 11.2.2.6)

5.3.2.  MIB Type Options Template

   There are also fields that provide type information from a MIB object
   definition that MAY be exported to a Collecting Process.

   Type information is statically defined in a MIB module; it is not
   expected to change.  However, the additional information about the
   MIB object may help a Collecting Process that does not have access to
   the MIB module.

   To export a MIB Type Options Template, the mibObjectIdentifier is
   RECOMMENDED as a Scope Field so that it matches the MIB Field Options




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   Template.  Any combination of the other MIB Type fields may be
   included.

   o  (scope) mibObjectIdentifier (see Section 11.2.2.1)

   o  mibObjectName (see Section 11.2.3.1)

   o  mibObjectDescription (see Section 11.2.3.2)

   o  mibObjectSyntax (see Section 11.2.3.3)

   o  mibModuleName (see Section 11.2.3.4)

5.4.  MIB Field Options Template Formats

5.4.1.  Data Template containing a mibObject Field

   The Template Record format of a Template that uses a mibObjectValue
   Information Element is identical to the standard IPFIX format as
   defined in [RFC7011], so a field using a mibObjectValue Information
   Element is specified using standard IPFIX Field Specifiers as in
   [RFC7011].

   The only extra requirement on a Template Record using mibObjectValue
   Information Element is that it MUST export the required metadata
   specified for EACH mibObjectValue Information Element (see
   Section 5.3.1).

   If Multiple MIB Field Options Data Records that refer to a
   mibObjectValue are received the latest MUST be used.  This matches
   the expected behavior of IPFIX Templates.

   There is a one to one mapping between each mibObjectValue Information
   Element and a MIB Field Options Data Record.

   A MIB Field Options Template and corresponding Data Record MUST be
   exported to provide the minimum required metadata.

   Figure 4 shows an IPFIX Template Set using a mibObjectValue
   Information Element.











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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 16          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |         Field Count = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = Existing IPFIX Field   |        Field Length           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = <mibObjectValue>       |        Field Length (MIB)     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 4: IPFIX Template Set using mibObjectValue Information Element

   Where:

      <mibObjectValue>

         One of the mibObjectValue IPFIX Information Elements that
         denotes that a MIB object data (i.e., the value of a MIB
         object) will be exported in the (Options) Template Record.

         This could be any one of the mibObjectValue Information
         Elements defined in Section 11.2.1: mibObjectValueInteger,
         mibObjectValueOctetString, mibObjectValueOID,
         mibObjectValueIPAddress, mibObjectValueBITS,
         mibObjectValueCounter, mibObjectValueGauge,
         mibObjectValueTimeTicks, mibObjectValueUnsigned,
         mibObjectValueTable, and mibObjectValueRow.

         When a mibObjectValue Information Element is used, the MIB
         Object Identifier ("mibObjectIdentifier") MUST be exported via
         a MIB Field Options or by other means.  See Section 5.3.1.

      Field Length (MIB)

         The length of the encoded MIB object data in the corresponding
         Data Records, in octets.  The definition is as [RFC7011].  Note
         that the Field Length can be expressed using reduced size
         encoding per [RFC7011].  Note that the Field Length may be
         encoded using variable-length encoding per [RFC7011].

5.4.2.  MIB Field Options Template

   The MIB Field Options Template is a Standard Options Template which
   defines the Fields that will be exported to provide enough metadata
   about a mibObjectValue Information Element so that the Collector can




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   tie the data values in the mibObjectValue Information Element back to
   the definition of the MIB object.

   All MIB Field Options Templates contain the fields as specified in
   Section 5.3.1.

   Figure 5 shows the required fields to export a mibObjectIdentifier
   for the MIB Field Options Template format.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 5: MIB Field Options Template Format - Required Fields

   Where:

      templateId

         The first Scope Field is an IPFIX Information Element which
         denotes that a Template Identifier will be exported as part of
         the MIB Field Options Data Record.  This Template Identifier
         paired with an index into that template, the
         "informationElementIndex" field, uniquely references one
         mibObjectValue Information Element being exported.

      informationElementIndex

         The second Scope Field is an IPFIX Information Element which
         denotes a zero based index into the fields defined by a
         Template.  When paired with a "templateId" the Record uniquely
         references one mibObjectValue Information Element being
         exported.

      mibObjectIdentifier




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         An IPFIX Information Element which denotes the a MIB Object
         Identifier for the mibObjectValue Information Element exported
         in the (Options) Template Record.

         When a MIB Object Value Information Element is used, the MIB
         Object Identifier MUST be specified in the MIB Field Options
         Template Record or specified by other means.

         The Object Identifier is encoded in the IPFIX data record in
         ASN.1/BER [BER] format.

         Variable-length encoding SHOULD be used with the
         mibObjectIdentifier so that multiple different length MIB OIDs
         can be exported efficiently.  This will also allow reuse of the
         MIB Field Options Template.

         Variable-length encoding is indicated by the Field Length value
         of 65535 per sections 3.2 and 7 of [RFC7011].  The RECOMMENDED
         use of variable length encoding for mibObjectIdentifier fields
         is indicated in subsequent figures by placing 65535 in the
         relevant length fields.

5.4.3.  MIB Field Options Data Records

   The MIB Field Options Data Records conform to the Template
   Specification in the MIB Field Options Template.  There may be
   multiple MIB Field Options Data Records exported.

   The Collecting Process MUST store all received MIB Field Options Data
   information for the duration of each Transport Session, because the
   Collecting Process will need to refer to the extra meta information
   to fully decode each mibObjectValue Information Element.

   Figure 6 shows the format of the exported MIB Field Options Data
   Record detailing the metadata that will be exported to match the
   Template in Figure 5.















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID               |          Length = N           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId             |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN        |                  mibObjectIdentifier ...      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         ... mibObjectIdentifier continued ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId             |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    VLEN       |  mibObjectIdentifier  ...                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         ... mibObjectIdentifier continued ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

             Figure 6: Format of MIB Field Options Data Record

5.4.4.  Options Template containing a mibObject Field

   The Options Template Record format of a Template that uses a
   mibObjectValue Information Element is identical to the standard
   format as defined in [RFC7011].  The mibObjectValue Information
   Element is specified using standard Field Specifiers as in [RFC7011].

   A mibObjectValue Information Element can be either a Scope Field or a
   non-Scope Field in an Options Template Record.

   The only extra requirement on a Options Template Record using
   mibObjectValue Information Element is that it MUST export the
   required metadata specified in Section 5.3.1 for EACH mibObjectValue
   Information Element.

   An IPFIX Options Template Record MUST export a MIB Field Options
   Template and Data Record to provide the minimum required metadata for
   each mibObjectValue Information Element.

   Figure 7 shows an IPFIX Options Template Set using an existing IPFIX
   Field as a Scope Field and with a mibObjectValueInteger IE as a non-
   Scope Field, while Figure 8 shows an IPFIX Options Template Set using
   a mibObjectValueInteger IE as a Scope Field with an existing IPFIX
   Field as a non-Scope Field.







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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 18          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |         Field Count = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Scope Field Count = 1    |0| IE = Existing IPFIX Field   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

          Figure 7: IPFIX Options Template Set using a Non Scope
                        mibObjectValueInteger Field

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 18          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |         Field Count = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Scope Field Count = 1    |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = Existing IPFIX Field   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

            Figure 8: IPFIX Options Template Set using a Scope
                        mibObjectValueInteger Field

5.4.5.  MIB Field Options Template with Semantics Fields

   A MIB Field Options Template MAY specify that extra Information
   Elements will be exported to record how the mibObjectValue was
   collected.

   Alternatively, one of the existing IPFIX observationTime* elements
   [IANA-IPFIX] may be exported to specify exactly when the value was
   collected.

   Figure 9 shows the MIB Field Options Template for a non-columnar
   Field with Semantic Data.





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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibCaptureTimeSemantics|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 9: MIB Field Options Template for a non-indexed Field with
                               Semantic Data

   Where:

      mibObjectIdentifier

         Note the use of variable length encoding for this field.

      mibCaptureTimeSemantics

         The MIB Capture Time Semantics IPFIX Information Element, as
         defined in Section 11.2.2.4.

         It is RECOMMENDED to include this field when exporting a
         mibObjectValue Information Element that specifies counters or
         statistics, in particular for situations with long lived Flows.

5.4.6.  MIB Field Options Template with extra MIB Object Details

   The OID exported within the mibObjectIdentifier IPFIX Information
   Element provides a OID reference to a MIB object type definition that
   will fully describe the MIB object data being Exported.

   However an Exported Process MAY decide to include some extra fields
   to more fully describe the MIB Object that is being exported with a
   mibObjectValue Information Element.

   This can be helpful if the Collecting Process may not have access to
   the MIB module.



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   The Exporting Process can either include the extra object details
   fields as part of the MIB Field Options Template, or export a
   separate Options Template and Data that maps MIB OIDs in
   mibObjectIdentifier Fields to the object details.

   If only a few fields are being exported then including extra type
   data in the MIB Field Options export will be more efficient.

   The MIB Field Options Template for a non-indexed Field with extra MIB
   object details is shown in Figure 10.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 38          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |        Field Count = 7        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectSyntax        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectName          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectDescription   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibModuleName          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 10: MIB Field Options Template for a non-indexed Field with
                         extra MIB object details

   Where:

      mibObjectSyntax

         The MIB object syntax string as defined in Section 11.2.3.3.

         Note that a separate mibObjectSyntax Information Element is
         required (rather than extend the existing
         informationElementDataType registry [IANA-IPFIX]) because the
         SYNTAX clause could contain almost any name.



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      mibObjectName

         The textual name a mibObjectIdentifier Object.

      mibObjectDescription

         The textual description for a mibObjectIdentifier.

      mibModuleName

         The textual name of the MIB module that defines a MIB Object.

      Note the use of variable length encoding for the
      mibObjectIdentifier, mibObjectSyntax, mibObjectName,
      mibObjectDescription, and mibModuleName, since these are all
      string fields.

   The MIB details can be exported as an standard IPFIX Option export
   [RFC7011] as shown in Figure 11.  This may be more efficient as the
   bulk of this data is text based and SHOULD be exported only once to
   the Collecting Process if there are many MIB objects being exported.
   This prevents this large textual data being included for every use of
   a mibObjectValue Information Element.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 30          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |        Field Count = 5        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 1       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectSyntax        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectName          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibObjectDescription   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |0| IE = mibModuleName          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 11: Alternative mibObjectIdentifier Option Export with object
                                  details





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5.5.  Use of field order in the MIB Field Option template

   The MIB Field Options Template export makes use of the
   informationElementIndex [IANA-IPFIX] to specify which field in the
   template that the metadata relates to, which avoids any ordering
   constraints on the data template.  The mibObjectValue Information
   Elements in a IPFIX export can be in any order in the export packet.
   However, fields used as an INDEX MUST be in the same order as
   specified in the INDEX clause of the conceptual row MIB object.

   The informationElementIndex specifies which Field in the Template
   extra information is being provided for.

   This is analogous to standard IPFIX Template Sets which also specify
   the order of the fields and provide their type and size.

   If the template changes such that the order is different then the MIB
   Field Options data MUST be resent to reflect the new ordering.  A new
   Template ID MUST be used to reflect that the ordering has changed.
   Older MIB Field Options Data may refer to the incorrect field.

   A templateId [IANA-IPFIX] is only locally unique within a combination
   of a Observation Domain and Transport session.  As such each MIB
   Field Options Data Record can only refer to templateIds within the
   same Observation Domain and session.

5.6.  Identifying the SNMP Context

   Each MIB OID is looked up in a specific context, usually the default
   context.  If exporting a MIB OID value that isn't in the default
   context then the context MUST be identified by including the
   mibContextEngineID (see Section 11.2.2.5) and mibContextName (see
   Section 11.2.2.6) fields in the MIB Field Options Template and
   associated MIB Field Options Data Records, or be included in the same
   template as the mibFieldValue Field.

   This context data MUST be included for each field that is not in the
   default context.

   The context information MAY be exported as part of the Template that
   includes the mibObjectValue Information Element or the context
   information MAY be exported in the MIB Field Options Data Record that
   refers to the field.  Context fields exported in the same Template
   MUST take precedence over those that refer to the template.  Context
   fields MUST apply to all mibObjectValue Information Elements in the
   same template and there MUST NOT be duplicates of mibContextName or
   mibContextEngineID in a Template.




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   So a MIB Field Options Template MAY specify no Context information,
   just the Context Engine ID or both the context engine and context
   name.  This allows the exporter to export the bulk of data in the
   default context and only tag those required.

   Since the MIB Field Options Template applies for all the records of a
   Template using Context Fields in the MIB Field Options Data Template
   requires that each mibContextEngineID / mibContextName pair have its
   own Template.

5.7.  Template Management

   Templates are managed as per section 8 of [RFC7011] with the
   additional constraint that the MIB Field Options Template and MIB
   Field Options Data Records MUST be exported in the same IPFIX Message
   as any (Option) Template Record that uses a mibObjectValue
   Information Element.

   When exporting over an SCTP transport [RFC4960], the MIB Field
   Options Data Records MUST be exported reliably and in the same SCTP
   stream as their associated Templates per [RFC6526].

   If a Template using a mibObjectValue Information Element is resent
   for any reason the Records it depends on MUST be sent as well.

   If a Template is replaced with a new (Option) Template then a new MIB
   Field Options Data Record MUST be sent with the replacement
   referencing the new Template ID.

   An Exporting Process SHOULD reuse MIB Field Options Template IDs when
   the Templates are identical.  Each (Option) Template Record MUST
   still be accompanied by a copy of the MIB Field Options Template.

5.7.1.  Large Messages

   The requirement to export the MIB Field Options Template and MIB
   Field Options Data Records in the same IPFIX Message as any (Option)
   Template Record that uses a mibObjectValue Information Element may
   result in very large IPFIX Messages.

   In environments with restricted Message sizes, and only when a
   reliable SCTP transport is being used, the MIB Field Options
   Template, MIB Field Options Data, Data Template, and Data Records,
   MAY be exported in separate Messages in the same SCTP stream,
   provided that their order is maintained.






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5.7.2.  Template Withdrawal and Reuse

   Data Records containing mibObjectValue Information Elements MUST NOT
   be exported if their corresponding Data Template or MIB Field Options
   Template has been withdrawn, since the MIB Field Options Template
   MUST be exported in the same IPFIX Message as the Data Template which
   it annotates, except as allowed by the caveat of Section 5.7.1.

   MIB Field Options Template IDs MUST NOT be reused while they are
   required by any existing Data Templates.

5.8.  Exporting Conceptual Rows and Tables

   There are three approaches for an IPFIX Exporting Process to export
   the values of columnar objects:

   1.  Ignoring the indexing of Columnar Objects

   2.  Exporting conceptual rows/table objects using structured data

   3.  Exporting individual indexed Columnar Objects

   Firstly, a subordinate columnar object may be used purely as a data
   type.  In this case there is no index information or relation to a
   conceptual row object provided by the Exporting Process.

   Secondly, mibObjectValueRow or mibObjectValueTable can be used to
   export partial or complete conceptual rows using [RFC6313] structured
   data.

   Thirdly, in a mixed option/data IPFIX/MIB template, the
   mibObjectValue Information Element can have the values of the INDEX
   clause of the conceptual row provided by other fields in the record.
   In this case each mibObjectValue Information Element must specify
   which other field(s) in the template is providing the index
   information.

5.8.1.  Exporting Conceptual Rows - indexing

   This document defines two forms of indexing that can be used for
   conceptual row MIB objects.

   Structured Data based indexing is used solely by the
   mibObjectValueRow Information Element.  Each conceptual row of the
   MIB object corresponds to a single Data Record exported.  The index
   fields defined in the INDEX clause of the MIB object MUST all be
   present in the same order as the Scope Fields.  This allows a simple




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   table export of a conceptual row MIB object without any extra fields
   required to indicate which fields make up the conceptual row INDEX.

   Field based indexing is used by giving each mibObjectValue
   Information Element a mibIndexIndicator to flag the required index
   fields.  This allows complex indexing or mixing of existing IPFIX
   Information Element with MIB Fields with minimum overhead.  It also
   allows multiple Columnar MIB objects from different conceptual rows
   to be exported with complete indexing in one IPFIX Template.

5.8.2.  Exporting Conceptual Rows - mibObjectValueRow

   The simplest approach to exporting a complete or partial conceptual
   row object is done with the mibObjectValueRow Information Element.

   This is a Structured Data subTemplateList Information Element as
   detailed in [RFC6313].  The template specified MUST be an Options
   Template.  It also MUST have the fields specified in the INDEX clause
   of the conceptual row object as the Scope Fields for the Option
   Export.

   An overview of this architecture is given in Figure 12.  This shows
   that the full MIB object type definition OID is exported for the
   mibObjectValueRow conceptual row field but that the individual
   columnar objects only require the subIdentifier to be exported.  To
   make the diagram clearer the Templates for the MIB Field Options
   Templates are not shown.
























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        +---------------------------+    +------------------------+
        | Data Template             |    | MIB Field Options Data |
        |                           |    |                        |
        | mibObjectValueRow         |<---| OID                    |
        +---------------------------+    +------------------------+
          |
          | +-----------------------+    +------------------------+
          | | Options Template      |    | MIB Field Options Data |
          | |                       |    |                        |
          | | Scope mibObjectValue* |<---| subIdentifiers         |
          | |       mibObjectValue* |<---| subIdentifiers         |
          | +-----------------------+    +------------------------+
          |             |
          V             V
        +---------------------------+
        | Data Flows                |
        |                           |
        | subTemplateList (1 entry) |
        +---------------------------+


        Figure 12: Architecture for Exporting Conceptual Rows with
                             mibObjectValueRow

   The mibIndexIndicator is not required for each individual
   mibObjectValue Information Element as mibObjectValueRow provides a
   structure that includes the index details.

   When Structured Data based indexing is used all Scope Fields MUST be
   the INDEX Objects in the same order as defined in the INDEX clause of
   the conceptual row being exported.

   Each conceptual table MIB object has 2 related OIDs.  There is an OID
   that refers to the Table with syntax of SEQUENCE OF and an OID that
   refers to each entry or conceptual row with the syntax of SEQUENCE.
   The OID for the SEQUENCE of a conceptual row MUST be exported.

   For example in the IF-MIB ([RFC2863]) the OID for ifEntry should be
   exported rather than the OID for ifTable.  The OID for the table (in
   this case ifTable) can be derived by removing one subidentifier from
   the ifEntry OID.

   The Full OID for the conceptual row MIB object type definition being
   exported with the mibObjectValueRow Information Element MUST be
   exported.  However the fields that are members of the conceptual row
   need not have the full OID of their MIB object type definition
   exported.  Instead the mibSubIdentifier Information Element can be
   used to document which entry in the conceptual row the Field is.



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   In this case the export flow will contain a single complete or
   partial row from a table inside a single field of the record.

   There may be MIB objects that are specified in the INDEX of the
   conceptual row but not columnar objects of the same conceptual row,
   for these the Exporter MUST provide the full OID in a
   mibObjectIdentifier field.

   So for a conceptual row object with the OID "1.2.3.4.5.6" the OID of
   the type definitions for columnar objects "1.2.3.4.5.6.1"
   "1.2.3.4.5.6.2" can be exported with just a subIdentifier of "1" and
   "2" respectively.

   The mibObjectValue Information Elements exported using the
   mibObjectValueRow export MUST all either be Objects defined in the
   INDEX clause, Columnar Objects of the same conceptual row object or
   Columnar Objects that AUGMENT the same conceptual row.

   The [RFC6313] Structured Data subTemplateList format requires a
   Structured Data Type Semantic to be specified.  Unless there is a
   more appropriate option in the IPFIX Structured Data Types Semantics
   registry ([IANA-IPFIX-SDTS]) the "undefined" Structured Data Type
   Semantic can be used.

   Figure 13 shows an IPFIX Template for a Structured Data export of a
   conceptual row, while Figure 14 shows an IPFIX Options Template for a
   complete conceptual row with five columns and two INDEX fields.
   Figure 15 shows the MIB Field Options Template for a conceptual row
   field.  Figure 16 shows the MIB Field Options Template for the
   columns inside the conceptual row.  Figure 17 shows the OID data for
   the conceptual row would be exported.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 12          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 300       |         Field Count = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectValueRow      |         Field Length          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

              Figure 13: IPFIX Template for a Conceptual Row








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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 30          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 301       |         Field Count = 5       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      Scope Field Count = 2    |0| IE = mibObjectValue  INDEX1 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = mibObjectValue  INDEX2 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = mibObjectValue  COLUM3 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = mibObjectValue  COLUM4 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |0| IE = mibObjectValue  COLUM5 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 14: IPFIX Options Template for a mibObjectValueRow with 5
                        columns and 2 INDEX fields

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 302       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 15: MIB Field Options Template for a Conceptual Row Object

   Where:

      templateId

         The templateId for the MIB Option that will be exported.

      mibObjectIdentifier



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         The MIB OID for the Conceptual Row that is being exported.
         Note the use of variable length encoding for this field.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 303       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibSubIdentifier       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Figure 16: MIB Field Options Template for Columnar Objects of a
                             Conceptual Table

   Where:

      templateId

         The templateId used will be for the Template referred to in the
         subTemplateList of the mibObjectValueRow that will be exported.

      mibSubIdentifier

         The sub identifier that specifies the columnar object's ID
         within the conceptual row.


















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 302         |          Length = N           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 300       |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN        |                  mibObjectIdentifier ...      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |         ... mibObjectIdentifier continued ...                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 303         |          Length = N           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 301       |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibSubIdentifier             |        templateId = 301       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  informationElementIndex      |  mibSubIdentifier             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 301       |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibSubIdentifier             |        templateId = 301       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  informationElementIndex      |  mibSubIdentifier             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 301       |  informationElementIndex      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibSubIdentifier             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

          Figure 17: mibOption Data Record for the conceptual row

   Where:

      mibObjectIdentifier

         Will contain the OID for the conceptual row as a whole.

      mibSubIdentifier

         The mibSubIdentifier fields will contain the extra Sub
         Identifier that when added to the OID for the conceptual row
         give the full OID for the Object.






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5.8.3.  Exporting Conceptual Rows - Augments

   SMIv2 defines conceptual rows as either having an INDEX clause or an
   AUGMENTS clause.  Conceptual row definitions with an AUGMENTS clause
   extend an existing base conceptual row with an INDEX clause.  It is
   not possible in SMIv2 to AUGMENT a conceptual row that itself has an
   AUGMENTS clause.  The base table and the augmentation have an
   identical INDEX.

   Since augmentations allow adding extra columns to existing tables it
   is beneficial to be able to support them easily in IPFIX exports of
   conceptual rows.

   The mibObjectValueRow OID MAY refer either to the base table with the
   INDEX clause, or to a conceptual row with an AUGMENTS clause.  The
   subIdentifiers in any MIB Field Options Data Record MUST always refer
   to the OID exported for the mibObjectValueRow IE.

   If the mibObjectValueRow OID refers to a base table then any extra
   columns from conceptual rows with an AUGMENTS clause MUST have their
   full OID exported.

   If the mibObjectValueRow OID refers to a conceptual row that augments
   another conceptual row using the AUGMENTS clause then any MIB fields
   from the original table's INDEX or Columnar Objects MUST NOT use the
   mibSubIdentifier and MUST instead export the full OID in a
   mibObjectIdentifier.

   If the mibObjectValueRow refers to an AUGMENTS conceptual row the
   Scope Fields of the Template using in the subTemplateList MUST have
   the INDEX fields from the base table, in the same order as its scope.
   This is identical to the Scope Field requirements for conceptual rows
   with an INDEX clause.

   This flexibility is provided so that the conceptual rows with the
   most columns can be exported using the more efficient
   mibSubIdentifier.  For example exporting a complete set of
   augmentation columns would only require the full OIDs for the MIB
   objects in the INDEX.

   It is possible to export MIB object columns from multiple AUGMENTS
   conceptual rows.  If this is done then the base table SHOULD be used
   as the main OID for the mibObjectValueRow.








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5.8.4.  Exporting Conceptual Tables - mibObjectValueTable

   Multiple rows of a conceptual table can be exported in the
   mibObjectValueTable Information Element (Section 11.2.1.10).  This
   allows a set of conceptual rows corresponding to a conceptual table
   to be exported as a single field.  Therefore a complete set of rows
   can be exported as a single field with other information elements in
   a Template.  In this fashion several complete conceptual tables could
   be exported in one packet.

   Identically with mibObjectValueRow, as in section Section 5.8.2
   above, the more specific OID of the SEQUENCE entity MUST be exported.

   The format of mibObjectValueTable is identical to mibObjectValueRow
   except that the length of the subTemplateList may be 0 or more
   entries.

   All the other, non length, requirements for mibObjectValueRow in
   Section 5.8.2 apply to mibObjectValueTable.

   An overview of this architecture is given in Figure 18.  This shows
   the similarity to Figure 12





























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        +---------------------------+    +------------------------+
        | Data Template             |    | MIB Field Options Data |
        |                           |    |                        |
        | mibObjectValueTable       |<---| OID                    |
        +---------------------------+    +------------------------+
          |
          | +-----------------------+    +------------------------+
          | | Options Template      |    | MIB Field Options Data |
          | |                       |    |                        |
          | | Scope mibObjectValue* |<---| subIdentifiers         |
          | |       mibObjectValue* |<---| subIdentifiers         |
          | +-----------------------+    +------------------------+
          |             |
          V             V
        +-----------------------------+
        | Data Flows                  |
        |                             |
        | subTemplateList (n entries) |
        |    row 1                    |
        |    ...                      |
        |    row n                    |
        +-----------------------------+


       Figure 18: Architecture for Exporting Conceptual Tables with
                            mibObjectValueTable

5.8.5.  Exporting Columnar Objects - using mibIndexIndicator

   The other option for indexing a Columnar Object that is part of a
   conceptual table is explicit indexing.  In this case there may be non
   index fields in the scope of the option export or there may be
   columnar MIB objects from multiple conceptual rows being exported.
   In this case each mibObjectValue Information Element requires the
   mibIndexIndicator with the bits set for the fields that are used to
   index that individual columnar object.

   The index fields MUST be in the 'correct' order as defined in the
   conceptual row that each columnar object is a member of.

   If a mibObjectValue Information Element that is being indexed using
   mibIndexIndicator is being used as an Options Template Scope Field,
   then all fields used to index that field MUST also be Scope Fields.

   Figure 19 shows the MIB Field Options Template for an indexed MIB
   Columnar Object.





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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID             |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibIndexIndicator      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 19: MIB Field Options Template for an indexed MIB Columnar
                                  Object

   Where:

      mibIndexIndicator

         The MIB Index Indicator IPFIX Information Element which marks
         which fields in the record will act as INDEX values for the
         exported MIB object.

         The index data for a mibObjectValue will be other fields
         contained in the same Data Record.  The mibIndexIndicator marks
         the Fields whose value(s) should be added to the OID for the
         MIB object type definition exported in mibObjectIdentifier to
         get the OID for the instance of the MIB object.

         Elements used to index MIB objects MUST be exported in the same
         order as they are specified in the INDEX field of the
         conceptual table they belong to.

      mibObjectIdentifier

         Note the use of variable length encoding for this field.

6.  Example Use Cases







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6.1.  Non Columnar MIB Object: Established TCP Connections

   The number of established TCP connections of a remote network device
   could be monitored by configuring it to periodically export the
   number of established TCP connections to a centralized Collector.  In
   this example, the Exporter would export an IPFIX Message every 30
   minutes that contained Data Records detailing the number of
   established TCP connections.

   The table of data that is to be exported looks like:

            +-------------------------+-----------------------+
            |        TIMESTAMP        | ESTABLISHED TCP CONN. |
            +-------------------------+-----------------------+
            | StartTime +   0 seconds |           10          |
            | StartTime +  60 seconds |           14          |
            | StartTime + 120 seconds |           19          |
            | StartTime + 180 seconds |           16          |
            | StartTime + 240 seconds |           23          |
            | StartTime + 300 seconds |           29          |
            +-------------------------+-----------------------+

                   Table 2: Established TCP Connections

   The Template Record for such a Data Record will detail two
   Information Elements:

   1.  flowStartSeconds from [IANA-IPFIX], Information Element 150: The
       absolute timestamp of the first packet of this Flow.

   2.  tcpCurrEstab from [RFC4022], Object ID "1.3.6.1.2.1.6.9": The
       number of TCP connections for which the current state is either
       ESTABLISHED or CLOSE-WAIT.

   Figure 20 shows the exported Template Set detailing the Template
   Record for exporting the number of established TCP connections.















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 16          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 400       |        Field Count = 2        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0|   IE = flowStartSeconds     |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0|   IE = mibObjectValueGauge  |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

              Figure 20: Example of tcpCurrEstab Template Set

   Figure 21 shows the exported MIB Field Options Template Set detailing
   the metadata that will be exported about the mibObjectValueGauge
   Information Element in Template 400 in Template Record.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 401       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Scope Field Count = 2        |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 21: Example of tcpCurrEstab MIB Field Options Template Set

   Figure 22 shows the exported MIB Field Options Data Set detailing the
   metadata that will be exported about the mibObjectValueGauge
   Information Element in Template 400 in Template Record.

   The OID for the MIB object tcpCurrEstab from [RFC4022], Object ID
   "1.3.6.1.2.1.6.9", will be encoded in ASN.1/BER [BER] as
   '06072b060102010609' in the data record, which takes nine octets.








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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 401         |          Length = 18          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 400       | informationElementIndex = 1   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  VLEN=9       | mibObjectIdentifier ...                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |      ... mibObjectIdentifier =  "1.3.6.1.2.1.6.9" ...         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   ... 06072b060102010609 ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 22: Example of tcpCurrEstab MIB Field Options Data Set

   Figure 23 shows the start of the Data Set for exporting the number of
   established TCP connections (see Section 6.1).

































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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 400         |          Length = 52          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime +   0 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              10                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime +  60 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              14                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime + 120 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              19                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime + 180 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              16                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime + 240 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              23                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                    StartTime + 300 seconds                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              29                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 23: Example of tcpCurrEstab Data Set

6.2.  Enterprise Specific MIB Object: Detailing CPU Load History

   For the sake of demonstrating a enterprise-specific MIB object from
   the CISCO-PROCESS-MIB ([CISCO-PROCESS-MIB]) is chosen.  This example
   would be valid with any enterprise-specific MIB module.

   The CPU Usage of a remote network device with 1 CPU could be
   monitored by configuring it to periodically export CPU usage
   information, i.e., the cpmCPUTotal1minRev from the proprietary CISCO-
   PROCESS-MIB, Object ID "1.3.6.1.4.1.9.9.109.1.1.1.1.7", to a
   centralized Collector.

   Although the cpmCPUTotal1minRev MIB object is a columnar object in a
   conceptual row, while there is only 1 CPU no extra information is
   conveyed by providing the INDEX field.  So in this case it is
   acceptable to not export the cpmCPUTotalIndex MIB object.  If there



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   were multiple CPUs it would be appropriate to include this the
   cpmCPUTotalIndex field and specify the relationship.

   In this example, the Exporter would export an IPFIX Message every 30
   minutes that contained Data Records detailing the CPU 1 minute busy
   average at 1 minute intervals.

   The table of data that is to be exported looks like:

             +-------------------------+---------------------+
             |        TIMESTAMP        | CPU BUSY PERCENTAGE |
             +-------------------------+---------------------+
             | StartTime +   0 seconds |         10%         |
             | StartTime +  60 seconds |         14%         |
             | StartTime + 120 seconds |         19%         |
             | StartTime + 180 seconds |         16%         |
             | StartTime + 240 seconds |         23%         |
             | StartTime + 300 seconds |         29%         |
             +-------------------------+---------------------+

                          Table 3: CPU Usage Data

   The Template Record for such a Data Record will detail two
   Information Elements:

   1.  flowStartSeconds from [IANA-IPFIX], Information Element 150: The
       absolute timestamp of the first packet of this Flow.

   2.  a mibObjectValueGauge for cpmCPUTotal1minRev, the overall CPU
       busy percentage in the last one-minute period.

   Figure 24 shows the exported Template Set detailing the Template
   Record for exporting CPU Load (see Section 6.2).

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 16          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 402       |        Field Count = 2        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0|   IE = flowStartSeconds     |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0|   IE = mibObjectValueGauge  |        Field Length = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 24: Example of CPU Load Template Set




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   Figure 25 shows the exported Template Set detailing the MIB Field
   Options Template for exporting CPU Load (see Section 6.2).  Note this
   is identical to the MIB Field Options Template given in Figure 21 so
   the same template could have been reused.

      0                   1                   2                   3
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 403       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Scope Field Count  = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

       Figure 25: Example of CPU Load MIB Field Options Template Set

   Figure 26 shows the exported MIB Field Options Data Set detailing the
   metadata that will be exported about the mibObjectValueGauge
   Information Element in Template 402 in Template Record (see
   Section 6.2).

   The OID for the cpmCPUTotal1minRev has been encoded using ASN.1/BER
   to '060d2b0601040109096d0101010107' at 15 octets long.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 403         |          Length = 24          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 402       | informationElementIndex = 1   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  VLEN=15      |  mibObjectIdentifier                     ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              "1.3.6.1.4.1.9.9.109.1.1.1.1.7"             ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |               060d2b0601040109096d0101010107             ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                                          ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

         Figure 26: Example of CPULoad MIB Field Options Data Set




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   Note that although cpmCPUTotal1minRev is 32 bits long, reduced size
   encoding [RFC7011] has been used to encode it within a single octet.
   The encoding size was specified by setting the length for the
   mibObjectValueGauge Field to 1 octet in the main Data Template -
   Figure 24.

   This example stresses that, even though the OID cpmCPUTotal1minRev is
   enterprise-specific, the E bit for the mibObjectValueGauge and
   mibObjectIdentifier is set to "0" since the "mibObjectValueGauge" and
   "mibObjectIdentifier" Information Element is not enterprise-specific.
   That this data is from an Enterprise MIB is included in the OID that
   includes an Enterprise ID.

   The corresponding Data Set does not add any value for this example,
   and is therefore not displayed.

6.3.  Exporting a Conceptual Row: The OSPF Neighbor Row

   Many conceptual tables are already defined in standard and
   proprietary MIBs.  These can be exported with a minimum of overhead
   by using the mibObjectValueRow.  This allows the Exporting Process to
   unambiguously define the INDEX for the entire conceptual row as the
   Scope Fields of an Option Export.  The use of a MIB Field Options
   Template with mibSubIdentifier being used means that each individual
   columnar object does not need to have its OID exported to the
   collector

   The ospfNbrTable defined in the OSPF MIB [RFC4750] consists of
   ospfNbrEntry, which has the OID "1.3.6.1.2.1.14.10.1".  Each
   mibObjectValueRow data record will therefore correspond to an
   ospfNbrEntry.

   The following fields will be exported:

   +------------------+----------------+-------------------------+-----+
   | Object           | ID             | mibObjectValue          | Len |
   +------------------+----------------+-------------------------+-----+
   | ospfNbrIpAddr    | ospfNbrEntry 1 | mibObjectValueIPAddress |  4  |
   | ospfNbrAddress-  | ospfNbrEntry 2 | mibObjectValueInteger   |  4  |
   | -LessIndex       |                |                         |     |
   | ospfNbrRtrId     | ospfNbrEntry 3 | mibObjectValueIPAddress |  4  |
   | ospfNbrState     | ospfNbrEntry 6 | mibObjectValueInteger   |  1  |
   +------------------+----------------+-------------------------+-----+

                   Table 4: OSPF Neighbor Entry Objects

   The OIDs that will be used to export this table are shown in Table 5.




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    +------------------+-----------------------+---------------------+
    | Entity           | Full OID              | Exported as         |
    +------------------+-----------------------+---------------------+
    | ospfNbrEntry     | 1.3.6.1.2.1.14.10.1   | 1.3.6.1.2.1.14.10.1 |
    | ospfNbrIpAddr    | 1.3.6.1.2.1.14.10.1.1 | 1                   |
    | ospfNbrAddress-  | 1.3.6.1.2.1.14.10.1.2 | 2                   |
    | -LessIndex       |                       |                     |
    | ospfNbrRtrId     | 1.3.6.1.2.1.14.10.1.3 | 3                   |
    | ospfNbrState     | 1.3.6.1.2.1.14.10.1.6 | 6                   |
    +------------------+-----------------------+---------------------+

                            Table 5: OSPF OIDs

   Figure 27 shows the Templates Exported to Support the
   mibObjectValueRow.  Figure 28 shows the example OID Data for the
   conceptual row exported in mibObjectValueRow Figure 29 shows the
   example data export for a few neighbors in the table.  This shows a
   Data Record in formatted as per IPFIX Structured Data [RFC6313] and
   using the the 'undefined' (= 0xFF) semantic [IANA-IPFIX-SDTS].  Note
   that the OID for ospfNbrEntry has been encoded using ASN.1/BER to
   '06082B060102010E0A01' at 10 octets long.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 12          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 500       |         Field Count = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectValueRow      |         Field Length = 16     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 501       |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = mibObjectValueIPAddress|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueIPAddress|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




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                                     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                     |       Set ID = 3              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Length = 22          |      Template ID = 502        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Count = 3        |  Scope Field Count = 2        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = templateId             |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = informationElementIndex|        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectIdentifier    |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 503       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibSubIdentifier       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 27: Example of ospfNbrEntry Template and Options Template Sets






















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 502         |          Length = 20          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 500       | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN=10     | mibObjectIdentifier = "1.3.6.1.2.1.14.10.1"   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                  06082B060102010E0A01                         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                               | Padding = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 503         |          Length = 28          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 501 | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 1   | templateId              = 501 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 1   | mibSubIdentifier        = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 501 | informationElementIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 3   | templateId              = 501 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 3   | mibSubIdentifier        = 6   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

            Figure 28: Example of ospfNbrEntry OID Data export




















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 500         |          Length = 52          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 501         |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrIpAddr = 192.0.2.1               |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrAddressLessIndex = 0             |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrRtrId = 1.1.1.1                  |ospfNbrState=8 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 501         |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrIpAddr = 192.0.2.2               |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrAddressLessIndex = 0             |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrRtrId = 2.2.2.2                  |ospfNbrState=8 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 501         |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrIpAddr = 192.0.2.3               |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrAddressLessIndex = 0             |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrRtrId = 3.3.3.3                  |ospfNbrState=1 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

            Figure 29: Example of Data Export for ospfNbrEntry

6.4.  Exporting Augmented Conceptual Row: The IF-MIB id to name mapping

   The ifTable defined in the [RFC2863] is augmented by the
   ifXTable (defined in the same MIB module).

   The OID of the ifEntry is 1.3.6.1.2.1.2.2.1 which is encoded using
   ASN.1/BER to '06082B06010201020201' at 10 octets long, while the OID
   of the augmenting ifXEntry is 1.3.6.1.2.1.31.1.1.1 which is encoded
   using ASN.1/BER to '060a2b060102011f01010101' at 12 octets long.

   This example demonstrates how columnar objects from the base
   conceptual row and the augmenting row can be exported in a single
   mibObjectValueRow Information Element.

   Table 6 shows the fields which will be exported.




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        +---------+------------------+-------+-------------------+
        | ifIndex | ifType           | ifMtu | ifName            |
        +---------+------------------+-------+-------------------+
        | 1       | ethernetCsmacd:6 | 1500  | Ethernet 10       |
        | 2       | ethernetCsmacd:6 | 1500  | Ethernet 20       |
        | 3       | ethernetCsmacd:6 | 1500  | FastEthernet 30   |
        +---------+------------------+-------+-------------------+

                           Table 6: IF-MIB Data

   The OIDs that will be used to export this table are shown in Table 7.

   +---------+------------------------+--------------------------------+
   | Entity  | Full OID               | Exported as                    |
   +---------+------------------------+--------------------------------+
   | ifEntry | 1.3.6.1.2.1.2.2.1      | OID   = 1.3.6.1.2.1.2.2.1      |
   | ifIndex | 1.3.6.1.2.1.2.2.1.1    | subID = 1                      |
   | ifType  | 1.3.6.1.2.1.2.2.1.3    | subID = 3                      |
   | ifMtu   | 1.3.6.1.2.1.2.2.1.4    | subID = 4                      |
   | ifName  | 1.3.6.1.2.1.31.1.1.1.1 | OID   = 1.3.6.1.2.1.31.1.1.1.1 |
   +---------+------------------------+--------------------------------+

                           Table 7: IF-MIB OIDs

   Figure 30 shows the Templates Exported to Support the
   mibObjectValueRow Information Element.  Figure 31 shows the example
   OID Data for the conceptual row exported in mibObjectValueRow to
   match Table 7.  Figure 32 shows the example data export as per
   Table 6.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 12          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 600       |         Field Count = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectValueRow      |         Field Length = 24     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 601       |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 1       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |0| IE = mibObjectValueInteger  |



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     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0|IE =mibObjectValueOctetString|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                     |       Set ID = 3              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Length = 22          |      Template ID = 602        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Count = 3        |   Scope Field Count = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = templateId             |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = informationElementIndex|        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectIdentifier    |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 603       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibSubIdentifier       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 30: Example of Augmented ifEntry Template and Options Template
                                   Sets













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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 602         |          Length = 40          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 600       | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN=10     | mibObjectIdentifier ...                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              ifEntry = 1.3.6.1.2.1.2.2.1                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              06082B06010201020201             |   Padding = 0 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 601       | informationElementIndex = 3   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN=12     | mibObjectIdentifier ifName ...                |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              ifName = 1.3.6.1.2.1.31.1.1.1.1                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              060a2b060102011f01010101                         |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |               |                  Padding = 0                  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 603         |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 601 | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 1   | templateId              = 601 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 1   | mibSubIdentifier        = 3   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 601 | informationElementIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 4   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

          Figure 31: Example of Augmented ifEntry OID Data export












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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 600         |          Length = 68          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 601         | ifIndex = 1   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ifType = 6              |        ifMtu = 1500           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  length = 11  |      ifName = Ethernet 10                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 601         | ifIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ifType = 6              |        ifMtu = 1500           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  length = 11  |      ifName = Ethernet 20                     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 601         | ifIndex = 3   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ifType = 6              |        ifMtu = 1500           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  length = 15  |      ifName = FastEthernet 30                 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        ...                                    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

          Figure 32: Example of Data Export for Augmented ifEntry

6.5.  Exporting a Columnar Object: The ipIfStatsInForwDatagrams

   It may be that the full set of columnar objects that are supported by
   a conceptual row are not required to be exported.  Rather than use
   the Structured Data method the mibIndexIndicator method can be used
   to provide the relation between fields.





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   This example shows the MIB Objects that are part of the INDEX of the
   conceptual row being exported in the correct order and then being
   referred to by using mibIndexIndicator.

   This example shows the export of ipIfStatsInForwDatagrams from the
   IP-MIB [RFC4293].  ipIfStatsInForwDatagrams is a columnar object that
   is part of the conceptual table ipIfStatsTable.  This is comprised of
   ipIfStatsEntry conceptual rows.

   The ipIfStatsTable conceptual table is indexed by the
   ipIfStatsIPVersion and ipIfStatsIfIndex.

   The Options Template Record for the example Data Record contains the
   following Information Elements:

   1.  ipIfStatsIPVersion (1.3.6.1.2.1.4.31.3.1.1) (Scope Field)
       (encoded using ASN.1/BER to '060A2B06010201041F030101' at 12
       octets long)

   2.  ipIfStatsIfIndex (1.3.6.1.2.1.4.31.3.1.2) (Scope Field)
       (encoded using ASN.1/BER to '060A2B06010201041F030102' at 12
       octets long)

   3.  ipIfStatsInForwDatagrams (1.3.6.1.2.1.4.31.3.1.12) (non-Scope
       Field)
       (encoded using ASN.1/BER to '060A2B06010201041F03010c' at 12
       octets long)

   Note ipIfStatsIfIndex has been reduce length encoded to 2 octets in
   the following example.  An exporting device with more interfaces
   would use the full length.

   Figure 33 shows the exported Options Template Set.


















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 701       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |     Scope Field Count = 2     |0|Scope 1=mibObjectValueInteger|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field 1 Length = 1    |0|Scope 2=mibObjectValueInteger|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field 1 Length = 2    |0| IE = mibObjectValueCounter  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |           Field Length = 4    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 33: Example of an Options Template for an Indexed MIB Object
                             with two indices.

   Figure 34 shows the exported MIB Field Options Template used to
   export the required mibObjectValue Information Element metadata.
   This example of the MIB Field Options Template includes the
   mibIndexIndicator to indicate that some of the other fields in the
   data records are indexes.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 702       |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Scope Field Count  = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibIndexIndicator      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 34: Example of an MIB Field Options Template for an Indexed
                       MIB Object with two indices.

   Figure 35 shows the exported MIB Field Options Data used to export
   the required mibObjectValue Information Element metadata.  Note that



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   the first two Data Records have all their mibIndexIndicator bits set
   to 0.  The third mibIndexIndicator has the value '11000000' to show
   that the first two fields in the record are the INDEX's for this
   columnar object.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 702         |          Length = 58          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 701       | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Index 00000000 | VLEN = 12     | mibObjectIdentifier       ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              "1.3.6.1.2.1.4.31.3.1.1"                     ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |               060A2B06010201041F030101                    ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |        templateId = 701       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 1   |Index 00000000 |   VLEN = 12   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibObjectIdentifier = "1.3.6.1.2.1.4.31.3.1.2"           ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                         060A2B06010201041F030102          ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                                           ... |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 701       | informationElementIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | Index 11000000 |  VLEN = 12   | mibObjectIdentifier      ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                  "1.3.6.1.2.1.4.31.3.1.12"               ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                   060A2B06010201041F03010c               ...  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 35: Example of an MIB Field Options Data Set for an Indexed
                       MIB Object with two indices.

   Figure 36 shows the Data Records that export the values of the 3
   mibObjectValue Information Elements.







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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 701         |          Length = 18          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | ipVer = 1     |    ifIndex =  10              |  ...          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    InForwDatagrams = 10000                    | ipVer = 2     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |    ifIndex = 10               | InForwDatagrams = 20000       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |             ...               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Figure 36: Example of an MIB Data Set for an Indexed MIB Object with
                               two indices.

6.6.  Exporting a Columnar Object indexed by IEs: ifOutQLen

   If a PSAMP Packet Report [RFC5476] was generated on any dropped
   packets on an interface then it may be desirable to know if the send
   queue on the output interface was full.  This could be done by
   exporting the size of the send queue (ifOutQLen) in the same Data
   Record as the PSAMP Packet Report.

   The exported data looks like:

   +-----------+-----------+--------+--------------+-------------------+
   |  SRC ADDR |  DST ADDR |  PAK   |    OUTPUT    |   OUTPUT Q. LEN   |
   |           |           |  LEN   |  INTERFACE   |    (ifOutQLen)    |
   +-----------+-----------+--------+--------------+-------------------+
   | 192.0.2.1 | 192.0.2.3 |  150   | Eth 1/0 (15) |         45        |
   | 192.0.2.4 | 192.0.2.9 |  350   | Eth 1/0 (15) |         45        |
   | 192.0.2.3 | 192.0.2.9 |  650   | Eth 1/0 (15) |         23        |
   | 192.0.2.4 | 192.0.2.6 |  350   | Eth 1/1 (16) |         0         |
   +-----------+-----------+--------+--------------+-------------------+

   Table 8: Packet Report with Interface Output Queue Length (ifOutQLen)
                                   Data

   The ifOutQLen MIB object defined in the IF-MIB [RFC2863] provides the
   length of the output packet queue.  This columnar object is part of
   the ifEntry conceptual row and indexed by the interface index
   (ifIndex).

   This relationship between the ifOutQLen field and the index field is
   exported using mibIndexIndicator in the MIB Field Options Template.
   The value of "00010000" flags the index fields concisely.



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   The Template Record for the example Data Record contains the
   following Information Elements:

   1.  sourceIPv4Address

   2.  destinationIPv4Address

   3.  totalLengthIPv4

   4.  egressInterface

   5.  ifOutQLen indexed by: egressInterface

   Figure 37 shows the exported Template Set detailing the Template for
   exporting a PSAMP Report with Interface Output Queue Length
   (ifOutQLen).  Figure 38 and Figure 39 show the MIB Field Options
   Template and Data Record.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 28          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 703       |        Field Count = 5        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = sourceIPv4Address      |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = destinationIPv4Address |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = totalLengthIPv4        |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = egressInterface        |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectValueGauge    |        Field Length = 4       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     Figure 37: Example of Template for a PSAMP Report with ifOutQLen
                        indexed by egressInterface













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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 704       |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  Scope Field Count  = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibIndexIndicator      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |0| IE = mibObjectIdentifier    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 38: Example of MIB Field Options Template for a PSAMP Report
                 with ifOutQLen indexed by egressInterface

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 704         |          Length = 21          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 703       | informationElementIndex = 4   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Index 00010000  | VLEN = 11    | mibObjectIdentifier    ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |             "1.3.6.1.2.1.2.2.1.21"                     ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |              06092B0601020102020115                    ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |               |
     +-+-+-+-+-+-+-+-+

      Figure 39: Example of MIB Field Options Data Record for a PSAMP
             Report with ifOutQLen indexed by egressInterface

   The corresponding IPFIX Data Record is shown in Figure 40.  For the
   sake of the example, the interface index of "Eth 1/0" is 15 and the
   interface index of "Eth 1/1" is 16.








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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 703         |          Length = 84          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.1                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.3                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             150                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        15 (Eth 1/0)                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              45                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.4                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.9                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             350                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        15 (Eth 1/0)                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              45                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.3                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.9                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             650                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        15 (Eth 1/0)                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                              23                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.4                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                          192.0.2.6                            |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                             350                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                        16 (Eth 1/1)                           |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                               0                               |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

    Figure 40: Example of PSAMP Packet Report with ifOutQLen indexed by
                              egressInterface



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6.7.  Exporting With Multiple Contexts: The OSPF Neighbor Row Revisited

   If the Context used to export the MIB objects is the default one no
   extra context fields are required.  This example demonstrates how to
   handle the case when the Context needs to be specified.  It is based
   on the previous example Section 6.3.

   The OSPF details exported of the conceptual row in Section 6.3 would
   be suitable if there were only one OSPF process running at the
   Observation Point.  If multiple OSPF processes are present then they
   can be differentiated by also exporting the mibContextEngineID and
   mibContextName.

   The following fields will be exported:

   +------------------+----------------+-------------------------+-----+
   | Object           | ID             | mibObjectValue          | Len |
   +------------------+----------------+-------------------------+-----+
   | ospfNbrIpAddr    | ospfNbrEntry 1 | mibObjectValueIPAddress |  4  |
   | ospfNbrAddress-  | ospfNbrEntry 2 | mibObjectValueInteger   |  4  |
   | -LessIndex       |                |                         |     |
   | ospfNbrRtrId     | ospfNbrEntry 3 | mibObjectValueIPAddress |  4  |
   | ospfNbrState     | ospfNbrEntry 6 | mibObjectValueInteger   |  1  |
   +------------------+----------------+-------------------------+-----+

                   Table 9: OSPF Neighbor Entry Objects

   The example contextEngineID matches the example from [RFC3411] for
   Acme Networks: "'800002b804616263'H (enterprise 696, string 'abc')"

   Figure 41 shows the Templates Exported to support a mibObjectValueRow
   that is defined within a context.  Figure 42 shows the example OID
   Data for the conceptual row exported in mibObjectValueRow.  These are
   unchanged from the previous example.  Figure 43 shows the example
   data for 2 OSPF neighbors.  Although these have identical INDEX/scope
   values the context information indicates they come from different
   OSPF processes.  Note that the OID for ospfNbrEntry has been encoded
   using ASN.1/BER to '06082B060102010E0A01' at 10 octets long.

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 2           |          Length = 20          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 800       |         Field Count = 3       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibContextEngineID     |         Field Length = 8      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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     |0| IE = mibContextName         |         Field Length = 4      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectValueRow      |         Field Length = 16     |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 26          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 801       |        Field Count = 4        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = mibObjectValueIPAddress|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueIPAddress|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 4       |0| IE = mibObjectValueInteger  |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 1       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                                     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                     |       Set ID = 3              |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Length = 22          |      Template ID = 802        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Count = 3        |  Scope Field Count = 2        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = templateId             |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = informationElementIndex|        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0| IE = mibObjectIdentifier    |        Field Length = 65535   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 3           |          Length = 22          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       Template ID = 803       |        Field Count = 3        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   Scope Field Count = 2       |0| IE = templateId             |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = informationElementIndex|
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |0| IE = mibSubIdentifier       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        Field Length = 2       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+



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   Figure 41: Example of ospfNbrEntry Template and Options Template Sets
                               with Context

      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 802         |          Length = 20          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |        templateId = 800       | informationElementIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |   VLEN=10     | mibObjectIdentifier = "1.3.6.1.2.1.14.10.1"   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                     06082B060102010E0A01                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |                                               | Padding = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 803         |          Length = 28          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 801 | informationElementIndex = 0   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 1   | templateId              = 801 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 1   | mibSubIdentifier        = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | templateId              = 801 | informationElementIndex = 2   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | mibSubIdentifier        = 3   | templateId              = 801 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     | informationElementIndex = 3   | mibSubIdentifier        = 6   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Figure 42: Example of ospfNbrEntry OID Data export with Context

















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      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |          Set ID = 800         |          Length = 60          |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibContextEngineID   = 800002b804616263                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  ... mibContextEngineID                                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibContextName = con1                                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 801         |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrIpAddr = 192.0.2.1               |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrAddressLessIndex = 0             |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrRtrId = 1.1.1.1                  |ospfNbrState=8 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibContextEngineID   = 800002b804616263                      |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  ... mibContextEngineID                                       |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |  mibContextName = con2                                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |Semantic=0xFF  |     Template ID = 801         |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrIpAddr = 192.0.2.1               |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrAddressLessIndex = 0             |        ...    |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |       ospfNbrRtrId = 2.2.2.2                  |ospfNbrState=8 |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Figure 43: Example of Data Export for ospfNbrEntry with Context

7.  Configuration Considerations

   When configuring a MIB OID for export, consideration should be given
   to whether the SNMP Context String should also be configurable.  If a
   non-default Context String is used then it should be associated with
   the fields as per Section 5.6.

8.  The Collecting Process's Side

   The specifications in section 9 of [RFC7011] also apply to Collectors
   that implement this specification.  In addition, the following
   specifications should be noted.



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   A Collecting Process that implements this specification MUST store
   the data records containing the OID Object Type Definitions with the
   same retention policy as templates.

   A Collecting Process that implements this specification SHOULD have
   access to MIB modules in order to look up the received MIB Object
   Identifiers and find the full type definition and name of MIB OID
   fields used in received templates.

   It should be noted that since reduced size encoding MAY be used by
   the Exporting Process, the Collecting Process cannot assume a
   received size for a field is the maximum size it should expect for
   that field.

   If a Collecting Process receives a MIB Object Identifier that it
   cannot decode, it MAY log a warning.

   A Collecting Process MUST support the 3 options for handling columnar
   objects detailed in Section 5.8.

9.  Applicability

   Making available the many and varied items from MIB modules opens up
   a wide range of possible applications for the IPFIX protocol, some
   quite different from the usual flow information.

   Some monitoring applications periodically export an interface ID to
   interface name mapping using IPFIX Options Templates.  This could be
   expanded to include the MIB object "ifInUcastPkts" of the IF-MIB
   [RFC2863] indexed using the ingressInterface Information Element.
   This would give the input statistics for each interface which can be
   compared to the flow information to ensure the sampling rate is
   expected.  Or, if there is no sampling, to ensure that all the
   expected packets are being monitored.

10.  Security Considerations

   For this extension to the IPFIX protocol, the same security
   considerations as for the IPFIX protocol apply [RFC7011].

   If the exporter is generating or capturing the field values itself,
   e.g., using the MIB objects only as an encoding or type mechanism,
   there are no extra security considerations beyond standard IPFIX.

   However, if the exporter is implemented as an SNMP manager accessing
   an SNMP agent, it MUST authenticate itself to the SNMP agent
   [RFC3414], [RFC5591], [RFC5592], [RFC6353], and the SNMP agent MUST




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   enforce SNMP access control rules [RFC3415] as required by the SNMP
   architecture [RFC3411].

   The access to particular MIB objects is controlled by the
   configuration of the IPFIX exporter.  This is consistent with the way
   IPFIX controls access to other Information Elements in general.

   The configuration of an IPFIX Exporter determines which MIB objects
   are included in IPFIX Data Records sent to certain collectors.
   Network operators should take care that the only MIB objects which
   are included in IPFIX Data Records are ones which the receiving flow
   collector is allowed to receive.  Note that multiple users may have
   access to the data from the flow collector.

   When exporting MIB objects that may be considered sensitive or
   vulnerable in some network environments (as mentioned in the Security
   Considerations section of the RFC containing the MIB module), the
   Exporter should consider using "IP Flow Anonymization Support"
   [RFC6235] if the information is anonymizable.  Consumers of exported
   data should therefore be able to handle the kinds of modifications to
   data described in [RFC6235].

11.  IANA Considerations

11.1.  New IPFIX Semantics

   New IPFIX semantics must be allocated in IANA's IPFIX registry
   [IANA-IPFIX] per section 6 of [RFC7012], as defined in the sub-
   sections below.

11.1.1.  snmpCounter

   An integral value reporting the value of a counter, identical to the
   Counter32 and Counter64 semantics in [RFC2578], as determined by the
   field length.

   This is similar to IPFIX's totalCounter semantic, except that total
   counters have an initial value of 0, while SNMP counters do not.

11.1.2.  snmpGauge

   An integral value identical to the Gauge32 semantic in [RFC2578], and
   the Gauge64 semantic in [RFC2856], as determined by the field length.








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11.2.  New IPFIX Information Elements

   The new Information Elements in Table 10 must be allocated in IANA's
   IPFIX registry [IANA-IPFIX], as defined in the sub-sections below.

   In each case the "Units" and "Range" are to be left blank, since
   these are not applicable.

                 +-----------+---------------------------+
                 | ElementId | Name                      |
                 +-----------+---------------------------+
                 | TBD1      | mibObjectValueInteger     |
                 | TBD2      | mibObjectValueOctetString |
                 | TBD3      | mibObjectValueOID         |
                 | TBD4      | mibObjectValueBits        |
                 | TBD5      | mibObjectValueIPAddress   |
                 | TBD6      | mibObjectValueCounter     |
                 | TBD7      | mibObjectValueGauge       |
                 | TBD8      | mibObjectValueTimeTicks   |
                 | TBD9      | mibObjectValueUnsigned    |
                 | TBD10     | mibObjectValueTable       |
                 | TBD11     | mibObjectValueRow         |
                 | TBD12     | mibObjectIdentifier       |
                 | TBD13     | mibSubIdentifier          |
                 | TBD14     | mibIndexIndicator         |
                 | TBD15     | mibCaptureTimeSemantics   |
                 | TBD16     | mibContextEngineID        |
                 | TBD17     | mibContextName            |
                 | TBD18     | mibObjectName             |
                 | TBD19     | mibObjectDescription      |
                 | TBD20     | mibObjectSyntax           |
                 | TBD21     | mibModuleName             |
                 +-----------+---------------------------+

                    Table 10: New Information Elements

11.2.1.  New MIB Value Information Elements

11.2.1.1.  mibObjectValueInteger

   A new Information Element "mibObjectValueInteger" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that the
      integer value of a MIB object will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with the Base Syntax of Integer32



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      and INTEGER with IPFIX Reduced Size Encoding used as required.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of signed64.

      Abstract Data Type: signed64

      Data Type Semantics: identifier

      ElementId: TBD1

      Status: current

      Reference: [this document].

11.2.1.2.  mibObjectValueOctetString

   A new Information Element "mibObjectValueOctetString" must be
   allocated in IANA's IPFIX registry [IANA-IPFIX], with the following
   definition:

      Description: An IPFIX Information Element which denotes that an
      Octet String or Opaque value of a MIB object will be exported.
      The MIB Object Identifier ("mibObjectIdentifier") for this field
      MUST be exported in a MIB Field Option or via another means.  This
      Information Element is used for MIB objects with the Base Syntax
      of OCTET STRING and Opaque.  The value is encoded as per the
      standard IPFIX Abstract Data Type of octetArray.

      Abstract Data Type: octetArray

      Data Type Semantics: default

      ElementId: TBD2

      Status: current

      Reference: [this document].

11.2.1.3.  mibObjectValueOID

   A new Information Element "mibObjectValueOID" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that an
      Object Identifier or OID value of a MIB object will be exported.
      The MIB Object Identifier ("mibObjectIdentifier") for this field
      MUST be exported in a MIB Field Option or via another means.  This
      Information Element is used for MIB objects with the Base Syntax



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      of OBJECT IDENTIFIER.  Note - In this case the
      "mibObjectIdentifier" will define which MIB object is being
      exported while the value contained in this Information Element
      will be an OID as a value.  The mibObjectValueOID Information
      Element is encoded as ASN.1/BER [BER] in an octetArray.

      Abstract Data Type: octetArray

      Data Type Semantics: default

      ElementId: TBD3

      Status: current

      Reference: [this document].

11.2.1.4.  mibObjectValueBits

   A new Information Element "mibObjectValueBits" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that a set
      of Enumerated flags or bits from a MIB object will be exported.
      The MIB Object Identifier ("mibObjectIdentifier") for this field
      MUST be exported in a MIB Field Option or via another means.  This
      Information Element is used for MIB objects with the Base Syntax
      of BITS.  The flags or bits are encoded as per the standard IPFIX
      Abstract Data Type of octetArray, with sufficient length to
      accommodate the required number of bits.  If the number of bits is
      not an integer multiple of octets then the most significant bits
      at end of the octetArray MUST be set to zero.

      Abstract Data Type: octetArray

      Data Type Semantics: flags

      ElementId: TBD4

      Status: current

      Reference: [this document].

11.2.1.5.  mibObjectValueIPAddress

   A new Information Element "mibObjectValueIPAddress" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:





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      Description: An IPFIX Information Element which denotes that the
      IPv4 Address of a MIB object will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with the Base Syntax of IPaddress.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of ipv4Address.

      Abstract Data Type: ipv4Address

      Data Type Semantics: default

      ElementId: TBD5

      Status: current

      Reference: [this document].

11.2.1.6.  mibObjectValueCounter

   A new Information Element "mibObjectValueCounter" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that the
      counter value of a MIB object will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with the Base Syntax of Counter32
      or Counter64 with IPFIX Reduced Size Encoding used as required.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of unsigned64.

      Abstract Data Type: unsigned64

      Data Type Semantics: snmpCounter

      ElementId: TBD6

      Status: current

      Reference: [this document].

11.2.1.7.  mibObjectValueGauge

   A new Information Element "mibObjectValueGauge" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:





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      Description: An IPFIX Information Element which denotes that the
      Gauge value of a MIB object will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with the Base Syntax of Gauge32.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of unsigned64.  This value will represent a non-negative integer,
      which may increase or decrease, but shall never exceed a maximum
      value, nor fall below a minimum value.

      Abstract Data Type: unsigned32

      Data Type Semantics: snmpGauge

      ElementId: TBD7

      Status: current

      Reference: [this document].

11.2.1.8.  mibObjectValueTimeTicks

   A new Information Element "mibObjectValueTimeTicks" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that the
      TimeTicks value of a MIB object will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with the Base Syntax of TimeTicks.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of unsigned32.

      Abstract Data Type: unsigned32

      Data Type Semantics: default

      ElementId: TBD8

      Status: current

      Reference: [this document].

11.2.1.9.  mibObjectValueUnsigned

   A new Information Element "mibObjectValueUnsigned" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:




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      Description: An IPFIX Information Element which denotes that an
      unsigned integer value of a MIB object will be exported.  The MIB
      Object Identifier ("mibObjectIdentifier") for this field MUST be
      exported in a MIB Field Option or via another means.  This
      Information Element is used for MIB objects with the Base Syntax
      of unsigned64 with IPFIX Reduced Size Encoding used as required.
      The value is encoded as per the standard IPFIX Abstract Data Type
      of unsigned64.

      Abstract Data Type: unsigned64

      Data Type Semantics: identifier

      ElementId: TBD9

      Status: current

      Reference: [this document].

11.2.1.10.  mibObjectValueTable

   A new Information Element "mibObjectValueTable" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that a
      complete or partial conceptual table will be exported.  The MIB
      Object Identifier ("mibObjectIdentifier") for this field MUST be
      exported in a MIB Field Option or via another means.  This
      Information Element is used for MIB objects with a SYNTAX of
      SEQUENCE.  This is encoded as a subTemplateList of mibObjectValue
      Information Elements.  The template specified in the
      subTemplateList MUST be an Options Template and MUST include all
      the Objects listed in the INDEX clause as Scope Fields.

      Abstract Data Type: subTemplateList

      Data Type Semantics: list

      ElementId: TBD10

      Status: current

      Reference: [this document].








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11.2.1.11.  mibObjectValueRow

   A new Information Element "mibObjectValueRow" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that a
      single row of a conceptual table will be exported.  The MIB Object
      Identifier ("mibObjectIdentifier") for this field MUST be exported
      in a MIB Field Option or via another means.  This Information
      Element is used for MIB objects with a SYNTAX of SEQUENCE.  This
      is encoded as a subTemplateList of mibObjectValue Information
      Elements.  The subTemplateList exported MUST contain exactly one
      row (i.e., one instance of the subtemplate).  The template
      specified in the subTemplateList MUST be an Options Template and
      MUST include all the Objects listed in the INDEX clause as Scope
      Fields.

      Abstract Data Type: subTemplateList

      Data Type Semantics: list

      ElementId: TBD11

      Status: current

      Reference: [this document].

11.2.2.  New MIB Field Options Information Elements

11.2.2.1.  mibObjectIdentifier

   A new Information Element "mibObjectIdentifier" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: An IPFIX Information Element which denotes that a MIB
      Object Identifier (MIB OID) is exported in the (Options) Template
      Record.  The mibObjectIdentifier Information Element contains the
      OID assigned to the MIB Object Type Definition encoded as ASN.1/
      BER [BER]

      Abstract Data Type: octetArray

      Data Type Semantics: default

      ElementId: TBD12

      Status: current




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      Reference: [this document].

11.2.2.2.  mibSubIdentifier

   A new Information Element "mibSubIdentifier" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: A non-negative sub-identifier of an Object Identifier
      (OID).

      Abstract Data Type: unsigned32

      Data Type Semantics: identifier

      ElementId: TBD13

      Status: current

      Reference: [this document].

11.2.2.3.  mibIndexIndicator

   A new Information Element "mibIndexIndicator" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: This set of bit fields is used for marking the
      Information Elements of a Data Record that serve as INDEX MIB
      objects for an indexed Columnar MIB object.  Each bit represents
      an Information Element in the Data Record with the n-th bit
      representing the n-th Information Element.  A bit set to value 1
      indicates that the corresponding Information Element is an index
      of the Columnar Object represented by the mibFieldValue.  A bit
      set to value 0 indicates that this is not the case.

      If the Data Record contains more than 64 Information Elements, the
      corresponding Template SHOULD be designed such that all INDEX
      Fields are among the first 64 Information Elements, because the
      mibIndexIndicator only contains 64 bits.  If the Data Record
      contains less than 64 Information Elements, then the extra bits in
      the mibIndexIndicator for which no corresponding Information
      Element exists MUST have the value 0, and must be disregarded by
      the Collector.  This Information Element may be exported with
      IPFIX Reduced Size Encoding.

      Abstract Data Type: unsigned64

      Data Type Semantics: flags




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      ElementId: TBD14

      Status: current

      Reference: [this document].

11.2.2.4.  mibCaptureTimeSemantics

   A new Information Element "mibCaptureTimeSemantics" must be allocated
   in IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: Indicates when in the lifetime of the flow the MIB
      value was retrieved from the MIB for a mibObjectIdentifier.  This
      is used to indicate if the value exported was collected from the
      MIB closer to flow creation or flow export time and will refer to
      the Timestamp fields included in the same record.  This field
      SHOULD be used when exporting a mibObjectValue that specifies
      counters or statistics.

      If the MIB value was sampled by SNMP prior to the IPFIX Metering
      Process or Exporting Process retrieving the value (i.e., the data
      is already stale) and it's important to know the exact sampling
      time, then an additional observationTime* element should be paired
      with the OID using structured data.  Similarly, if different
      mibCaptureTimeSemantics apply to different mibObject elements
      within the Data Record, then individual mibCaptureTimeSemantics
      should be paired with each OID using structured data.

      Values:

         0.  undefined

         1.  begin - The value for the MIB object is captured from the
         MIB when the Flow is first observed

         2.  end - The value for the MIB object is captured from the MIB
         when the Flow ends

         3.  export - The value for the MIB object is captured from the
         MIB at export time

         4.  average - The value for the MIB object is an average of
         multiple captures from the MIB over the observed life of the
         Flow

      Abstract Data Type: unsigned8

      Data Type Semantics: identifier



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      ElementId: TBD15

      Status: current

      Reference: [this document].

11.2.2.5.  mibContextEngineID

   A new Information Element "mibContextEngineID" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: A mibContextEngineID that specifies the SNMP engine
      ID for a MIB field being exported over IPFIX.  Definition as per
      [RFC3411] section 3.3

      Abstract Data Type: octetArray

      Data Type Semantics: default

      ElementId: TBD16

      Status: current

      Reference: [this document].

11.2.2.6.  mibContextName

   A new Information Element "mibContextName" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: This Information Element denotes that a MIB Context
      Name is specified for a MIB field being exported over IPFIX.
      Reference [RFC3411] section 3.3

      Abstract Data Type: string

      Data Type Semantics: default

      ElementId: TBD17

      Status: current

      Reference: [this document].








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11.2.3.  New MIB Type Information Elements

11.2.3.1.  mibObjectName

   A new Information Element "mibObjectName" must be allocated in IANA's
   IPFIX registry [IANA-IPFIX], with the following definition:

      Description: The name (called a descriptor in [RFC2578]) of an
      object type definition.

      Abstract Data Type: string

      Data Type Semantics: default

      ElementId: TBD18

      Status: current

      Reference: [this document].

11.2.3.2.  mibObjectDescription

   A new Information Element "mibObjectDescription" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: The value of the DESCRIPTION clause of an MIB object
      type definition.

      Abstract Data Type: string

      Data Type Semantics: default

      ElementId: TBD19

      Status: current

      Reference: [this document].

11.2.3.3.  mibObjectSyntax

   A new Information Element "mibObjectSyntax" must be allocated in
   IANA's IPFIX registry [IANA-IPFIX], with the following definition:

      Description: The value of the SYNTAX clause of an MIB object type
      definition, which may include a Textual Convention or Subtyping.
      See [RFC2578].

      Abstract Data Type: string



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      Data Type Semantics: default

      ElementId: TBD20

      Status: current

      Reference: [this document].

11.2.3.4.  mibModuleName

   A new Information Element "mibModuleName" must be allocated in IANA's
   IPFIX registry [IANA-IPFIX], with the following definition:

      Description: The textual name of the MIB module that defines a MIB
      Object.

      Abstract Data Type: string

      Data Type Semantics: default

      ElementId: TBD21

      Status: current

      Reference: [this document].

12.  Acknowledgements

   The authors would like to thank Andrew Johnson for his collaboration
   on the first version of the draft, and to thank Andrew Feren and
   Brian Trammell for their detailed reviews.

   Juergen Schoenwaelder was partly funded by Flamingo, a Network of
   Excellence project (ICT-318488) supported by the European Commission
   under its Seventh Framework Programme.

13.  References

13.1.  Normative References

   [BER]      International Organization for Standardization,
              "Information processing systems - Open Systems
              Interconnection - Specification of Basic Encoding Rules
              for Abstract Syntax Notation One (ASN.1),International
              Organization for Standardization.  International Standard
              8825, December 1987", <http://www.iso.org>.





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   [IANA-IPFIX]
              IANA, "IPFIX Information Elements registry",
              <http://www.iana.org/assignments/ipfix/ipfix.xml>.

   [IANA-IPFIX-SDTS]
              IANA, "IPFIX Structured Data Types Semantics registry",
              <http://www.iana.org/assignments/ipfix/ipfix.xml>.

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

   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578,
              DOI 10.17487/RFC2578, April 1999,
              <http://www.rfc-editor.org/info/rfc2578>.

   [RFC2856]  Bierman, A., McCloghrie, K., and R. Presuhn, "Textual
              Conventions for Additional High Capacity Data Types",
              RFC 2856, DOI 10.17487/RFC2856, June 2000,
              <http://www.rfc-editor.org/info/rfc2856>.

   [RFC3411]  Harrington, D., Presuhn, R., and B. Wijnen, "An
              Architecture for Describing Simple Network Management
              Protocol (SNMP) Management Frameworks", STD 62, RFC 3411,
              DOI 10.17487/RFC3411, December 2002,
              <http://www.rfc-editor.org/info/rfc3411>.

   [RFC6526]  Claise, B., Aitken, P., Johnson, A., and G. Muenz, "IP
              Flow Information Export (IPFIX) Per Stream Control
              Transmission Protocol (SCTP) Stream", RFC 6526,
              DOI 10.17487/RFC6526, March 2012,
              <http://www.rfc-editor.org/info/rfc6526>.

   [RFC7011]  Claise, B., Ed., Trammell, B., Ed., and P. Aitken,
              "Specification of the IP Flow Information Export (IPFIX)
              Protocol for the Exchange of Flow Information", STD 77,
              RFC 7011, DOI 10.17487/RFC7011, September 2013,
              <http://www.rfc-editor.org/info/rfc7011>.

   [RFC7012]  Claise, B., Ed. and B. Trammell, Ed., "Information Model
              for IP Flow Information Export (IPFIX)", RFC 7012,
              DOI 10.17487/RFC7012, September 2013,
              <http://www.rfc-editor.org/info/rfc7012>.





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13.2.  Informative References

   [CISCO-PROCESS-MIB]
              Cisco Systems Inc., "CISCO-PROCESS-MIB.my: MIB for CPU and
              process statistics",
              <http://tools.cisco.com/Support/SNMP/do/
              BrowseMIB.do?local=en&mibName=CISCO-PROCESS-MIB>.

   [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
              MIB", RFC 2863, DOI 10.17487/RFC2863, June 2000,
              <http://www.rfc-editor.org/info/rfc2863>.

   [RFC2982]  Kavasseri, R., Ed., "Distributed Management Expression
              MIB", RFC 2982, DOI 10.17487/RFC2982, October 2000,
              <http://www.rfc-editor.org/info/rfc2982>.

   [RFC3414]  Blumenthal, U. and B. Wijnen, "User-based Security Model
              (USM) for version 3 of the Simple Network Management
              Protocol (SNMPv3)", STD 62, RFC 3414,
              DOI 10.17487/RFC3414, December 2002,
              <http://www.rfc-editor.org/info/rfc3414>.

   [RFC3415]  Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based
              Access Control Model (VACM) for the Simple Network
              Management Protocol (SNMP)", STD 62, RFC 3415,
              DOI 10.17487/RFC3415, December 2002,
              <http://www.rfc-editor.org/info/rfc3415>.

   [RFC3444]  Pras, A. and J. Schoenwaelder, "On the Difference between
              Information Models and Data Models", RFC 3444,
              DOI 10.17487/RFC3444, January 2003,
              <http://www.rfc-editor.org/info/rfc3444>.

   [RFC4022]  Raghunarayan, R., Ed., "Management Information Base for
              the Transmission Control Protocol (TCP)", RFC 4022,
              DOI 10.17487/RFC4022, March 2005,
              <http://www.rfc-editor.org/info/rfc4022>.

   [RFC4293]  Routhier, S., Ed., "Management Information Base for the
              Internet Protocol (IP)", RFC 4293, DOI 10.17487/RFC4293,
              April 2006, <http://www.rfc-editor.org/info/rfc4293>.

   [RFC4750]  Joyal, D., Ed., Galecki, P., Ed., Giacalone, S., Ed.,
              Coltun, R., and F. Baker, "OSPF Version 2 Management
              Information Base", RFC 4750, DOI 10.17487/RFC4750,
              December 2006, <http://www.rfc-editor.org/info/rfc4750>.





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   [RFC4960]  Stewart, R., Ed., "Stream Control Transmission Protocol",
              RFC 4960, DOI 10.17487/RFC4960, September 2007,
              <http://www.rfc-editor.org/info/rfc4960>.

   [RFC5470]  Sadasivan, G., Brownlee, N., Claise, B., and J. Quittek,
              "Architecture for IP Flow Information Export", RFC 5470,
              DOI 10.17487/RFC5470, March 2009,
              <http://www.rfc-editor.org/info/rfc5470>.

   [RFC5476]  Claise, B., Ed., Johnson, A., and J. Quittek, "Packet
              Sampling (PSAMP) Protocol Specifications", RFC 5476,
              DOI 10.17487/RFC5476, March 2009,
              <http://www.rfc-editor.org/info/rfc5476>.

   [RFC5591]  Harrington, D. and W. Hardaker, "Transport Security Model
              for the Simple Network Management Protocol (SNMP)",
              STD 78, RFC 5591, DOI 10.17487/RFC5591, June 2009,
              <http://www.rfc-editor.org/info/rfc5591>.

   [RFC5592]  Harrington, D., Salowey, J., and W. Hardaker, "Secure
              Shell Transport Model for the Simple Network Management
              Protocol (SNMP)", RFC 5592, DOI 10.17487/RFC5592, June
              2009, <http://www.rfc-editor.org/info/rfc5592>.

   [RFC6235]  Boschi, E. and B. Trammell, "IP Flow Anonymization
              Support", RFC 6235, DOI 10.17487/RFC6235, May 2011,
              <http://www.rfc-editor.org/info/rfc6235>.

   [RFC6313]  Claise, B., Dhandapani, G., Aitken, P., and S. Yates,
              "Export of Structured Data in IP Flow Information Export
              (IPFIX)", RFC 6313, DOI 10.17487/RFC6313, July 2011,
              <http://www.rfc-editor.org/info/rfc6313>.

   [RFC6353]  Hardaker, W., "Transport Layer Security (TLS) Transport
              Model for the Simple Network Management Protocol (SNMP)",
              STD 78, RFC 6353, DOI 10.17487/RFC6353, July 2011,
              <http://www.rfc-editor.org/info/rfc6353>.

Authors' Addresses

   Paul Aitken (editor)
   Brocade Communications Systems, Inc.
   19a Canning Street, Level 3
   Edinburgh, Scotland  EH3 8EG
   United Kingdom

   Phone: +44 203 005 0731
   Email: paitken@brocade.com



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   Benoit Claise
   Cisco Systems, Inc.
   De Kleetlaan 6a b1
   Diegem  1813
   Belgium

   Phone: +32 2 704 5622
   Email: bclaise@cisco.com


   Srikar B S
   Cisco Systems, Inc.
   Mail Stop BGL13/3/, SEZ Unit, Cessna Business Park, Kadubeesanahalli
   Village Varthur Hobli, Sarjapur Marathalli Outer Ring Road
   Bangalore  KARNATAKA 560 103
   IN

   Phone: +91 80 4426 3264
   Email: srikar@cisco.com


   Colin McDowall
   Brocade Communications Systems, Inc.
   19a Canning Street, Level 3
   Edinburgh, Scotland  EH3 8EG
   United Kingdom

   Phone: +44 203 005 0687
   Email: cmcdowal@brocade.com


   Juergen Schoenwaelder
   Jacobs University Bremen
   Campus Ring 1
   Bremen  28725
   Germany

   Phone: +49 421 200-3587
   Email: j.schoenwaelder@jacobs-university.de












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