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rfc:rfc8038

Internet Engineering Task Force (IETF) P. Aitken, Ed. Request for Comments: 8038 Brocade Category: Standards Track B. Claise ISSN: 2070-1721 Cisco Systems, Inc.

                                                                S. B S
                                                   Mojo Networks, Inc.
                                                           C. McDowall
                                                               Brocade
                                                      J. Schoenwaelder
                                              Jacobs University Bremen
                                                              May 2017
                      Exporting MIB Variables
       Using the IP Flow Information Export (IPFIX) Protocol

Abstract

 This document specifies a way to complement IP Flow Information
 Export (IPFIX) Data Records with Management Information Base (MIB)
 objects, avoiding the need to define new IPFIX Information Elements
 for existing MIB objects that are already fully specified.
 Two IPFIX Options Templates, as well as a method for creating IPFIX
 Options Templates that are used to export the extra data required to
 fully describe Simple Network Management Protocol (SNMP) MIB objects
 in IPFIX, are specified herein.

Status of This Memo

 This is an Internet Standards Track document.
 This document is a product of the Internet Engineering Task Force
 (IETF).  It represents the consensus of the IETF community.  It has
 received public review and has been approved for publication by the
 Internet Engineering Steering Group (IESG).  Further information on
 Internet Standards is available in Section 2 of RFC 7841.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc8038.

Aitken, et al. Standards Track [Page 1] RFC 8038 Exporting MIB Variables with IPFIX May 2017

Copyright Notice

 Copyright (c) 2017 IETF Trust and the persons identified as the
 document authors.  All rights reserved.
 This document is subject to BCP 78 and the IETF Trust's Legal
 Provisions Relating to IETF Documents
 (http://trustee.ietf.org/license-info) in effect on the date of
 publication of this document.  Please review these documents
 carefully, as they describe your rights and restrictions with respect
 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 ....................................................4
 2. Motivation ......................................................5
 3. Terminology .....................................................7
 4. High-Level Solution Overview ....................................8
 5. MIB Object Value Information Elements and the MIB Field
    Options Template ...............................................10
    5.1. MIB Field Options Architecture ............................11
    5.2. IPFIX and MIB Data Model ..................................13
    5.3. MIB Field Options - Specifications and Required Fields ....15
         5.3.1. MIB Field Options Template .........................16
         5.3.2. MIB Type Options Template ..........................16
    5.4. MIB Field Options Template Formats ........................17
         5.4.1. Data Template Containing a mibObjectValue Field ....17
         5.4.2. MIB Field Options Template .........................19
         5.4.3. MIB Field Options Data Records .....................20
         5.4.4. Options Template Containing a
                mibObjectValue Field ...............................21
         5.4.5. MIB Field Options Template with Semantics Fields ...23
         5.4.6. MIB Field Options Template with Extra MIB
                Object Details .....................................24
    5.5. Use of Field Order in the MIB Field Options Template ......27
    5.6. Identifying the SNMP Context ..............................27
    5.7. Template Management .......................................28
         5.7.1. Large Messages .....................................28
         5.7.2. Template Withdrawal and Reuse ......................29

Aitken, et al. Standards Track [Page 2] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    5.8. Exporting Conceptual Rows and Tables ......................29
         5.8.1. Exporting Conceptual Rows - Indexing ...............30
         5.8.2. Exporting Conceptual Rows - mibObjectValueRow ......30
         5.8.3. Exporting Conceptual Rows - AUGMENTS ...............36
         5.8.4. Exporting Conceptual Tables - mibObjectValueTable ..37
         5.8.5. Exporting Columnar Objects: Using
                mibIndexIndicator ..................................38
 6. Example Use Cases ..............................................39
    6.1. Non-columnar MIB Object: Established TCP Connections ......39
    6.2. Enterprise-Specific MIB Object: Detailing CPU Load
         History ...................................................42
    6.3. Exporting a Conceptual Row: The OSPF Neighbor Row .........45
    6.4. Exporting Augmented Conceptual Row: Mapping IF-MIB
         ID to Name ................................................49
    6.5. Exporting a Columnar Object: ipIfStatsInForwDatagrams .....55
    6.6. Exporting a Columnar Object Indexed by Information
         Elements: ifOutQLen .......................................58
    6.7. Exporting with Multiple Contexts: The OSPF
         Neighbor Row Revisited ....................................62
 7. Configuration Considerations ...................................65
 8. The Collecting Process's Side ..................................66
 9. Applicability ..................................................66
 10. Security Considerations .......................................67
 11. IANA Considerations ...........................................68
    11.1. New IPFIX Semantics ......................................68
         11.1.1. snmpCounter .......................................68
         11.1.2. snmpGauge .........................................68
    11.2. New IPFIX Information Elements ...........................69
         11.2.1. New MIB Object Value Information Elements .........69
         11.2.2. New MIB Field Options Information Elements ........75
         11.2.3. New MIB Type Information Elements .................79
 12. References ....................................................81
    12.1. Normative References .....................................81
    12.2. Informative References ...................................82
 Acknowledgments ...................................................84
 Authors' Addresses ................................................84

Aitken, et al. Standards Track [Page 3] RFC 8038 Exporting MIB Variables with IPFIX May 2017

1. Introduction

 There is growing interest in using IP Flow Information Export (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 object
 as defined in [RFC2863].
 In particular, the Management Information Base was designed as a
 separate system of definitions; this 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],
 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 MIB
    objects;
 o  to avoid the need to define new IPFIX Information Elements for
    existing MIB objects that are already fully specified;
 o  to allow the correlation of SNMP and IPFIX sourced data by
    exporting them together; and
 o  to allow SNMP push data from SNMP-only devices to be more easily
    integrated into IPFIX-based collection infrastructures.

Aitken, et al. Standards Track [Page 4] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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 Data Records with useful and already-standardized information.
 Special consideration is given to the case of an existing
 Template Record that 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 Data Record containing
 the ingressInterface Information Element, which needs to be augmented
 by interface counters [RFC2863] that are indexed by the respective
 ingressInterface values 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.
 o  Synchronization problems occur because 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 idle 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 [RFC5102] for details regarding active
    and idle timeouts.
 This document does not specify how to carry SNMP notifications in
 IPFIX, even if the specifications in this document could potentially
 allow this.

Aitken, et al. Standards Track [Page 5] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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 "IPFIX Information Elements" subregistry [IANA-IPFIX] that
 contains informationElementDataType.
 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 the Network Configuration Protocol (NETCONF) or
 the device's Command Line Interface (CLI), may provide access to the
 same instrumentation.
              +------+  +-------+  +.........+  +.....+
              | SNMP |  | IPFIX |  : NETCONF :  : CLI :
              +------+  +-------+  +.........+  +.....+
                  |         |           |          |
            +--------------------------------------------+
            | Instrumentation (specified in MIB modules) |
            +--------------------------------------------+
                     Figure 1: Architectural Model

Aitken, et al. Standards Track [Page 6] RFC 8038 Exporting MIB Variables with IPFIX May 2017

3. Terminology

 IPFIX-specific terminology (Information Element, Template,
 Template Record, Options Template Record, Template Set, Collector,
 Exporter, Data Record, Transport Session, Exporting Process,
 Collecting Process, 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 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") that 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", "IpAddress", "Counter32", "Gauge32",
    "TimeTicks", "Opaque", "Counter64", "Unsigned32", "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].

Aitken, et al. Standards Track [Page 7] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 mibObjectValue Information Elements
    "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 as defined in
    Section 11.2.1: mibObjectValueInteger, mibObjectValueOctetString,
    mibObjectValueOID, mibObjectValueBits, mibObjectValueIPAddress,
    mibObjectValueCounter, mibObjectValueGauge,
    mibObjectValueTimeTicks, mibObjectValueUnsigned,
    mibObjectValueTable, and mibObjectValueRow.
 Abstract Data Type
    Abstract Data Types for IPFIX are defined in Section 3.1 of
    [RFC7012].  This specification uses the Abstract Data Types
    "unsigned8", "unsigned32", "unsigned64", "signed32", "octetArray",
    "string", "ipv4Address", and "subTemplateList".
 IE
    Used as 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 metadata:
 o  MIB Field Options Template (Section 5.3.1)
 o  MIB Type Options Template (Section 5.3.2)

Aitken, et al. Standards Track [Page 8] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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 Elements (Section 11.2.3)
 Additionally, this document defines two new IPFIX semantics that are
 required for the new Information Elements:
 o  snmpCounter (Section 11.1.1)
 o  snmpGauge (Section 11.1.2)
 Two common types defined in SMIv2 are conceptual rows and conceptual
 tables.  It is desirable that exporting a complete or partial
 conceptual row be 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 explain that a MIB
 object is indexed by other fields in the same Data Flow.  For an
 individually indexed mibObjectValue, the index fields are sent in the
 same way as any of the other fields in the same Data 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.

Aitken, et al. Standards Track [Page 9] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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.
 The Metering Process 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 information to understand each field that is being
 exported is provided in Section 5.3.1.
 One approach to this problem would be to extend the IPFIX standard to
 allow extended Field Specifiers so that metadata about fields can be
 included in Data Templates.  This would, however, require a new
 version of the IPFIX standard that may not be backward 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 that
 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.

Aitken, et al. Standards Track [Page 10] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 The MIB Field Options export tells the Collecting Process the OID for
 the MIB object type definition for the following (Template, field).

5.1. MIB Field Options Architecture

 Four IPFIX Sets are used together to export a Flow that contains
 mibObjectValue Information Elements.  These are:
 1.  A Template Set that 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.

Aitken, et al. Standards Track [Page 11] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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.
 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 sent in subsequent packets.

Aitken, et al. Standards Track [Page 12] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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

5.2. IPFIX and MIB Data Model

 [RFC2578], Section 7.1 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, BITS,
 or a textual convention.  (SEQUENCE OF and SEQUENCE are also possible
 for conceptual tables, see section 7.1.12)."

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 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 sub-typing
 (e.g., integerSubType, octetStringSubType) [RFC2578], the
 mibObjectSyntax Information Element SHOULD be used to export this
 detail to the Collecting Process.
 The options for the SYNTAX clause are then mapped as follows:
 +-------------+-------------------+---------------------------------+
 | Section in  | SYNTAX            | mibObjectValue Information      |
 | RFC 2578    |                   | Element                         |
 +-------------+-------------------+---------------------------------+
 | 7.1.1       | INTEGER/Integer32 | mibObjectValueInteger           |
 | 7.1.2       | OCTET STRING      | mibObjectValueOctetString       |
 | 7.1.3       | OBJECT IDENTIFIER | mibObjectValueOID               |
 | 7.1.4       | BITS              | 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               |
 | 7.1.12      | SEQUENCE OF       | 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
 Object Identifiers (OIDs) will be encoded as per ASN.1/BER [X.690] 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.

Aitken, et al. Standards Track [Page 14] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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 being
 exported indicates that the MIB object was defined in an
 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 that depend
 upon them.  That is, 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 that 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 when IPFIX
 Structured Data [RFC6313] 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; Information Element defined in
    Section 11.2.2.4)
 o  mibIndexIndicator
    (discussed in Section 5.8.5; Information Element defined in
    Section 11.2.2.3)
 o  mibContextEngineID
    (discussed in Section 5.6; Information Element defined in
    Section 11.2.2.5)
 o  mibContextName
    (discussed in Section 5.6; Information Element 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.

Aitken, et al. Standards Track [Page 16] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 To export a MIB Type Options Template, the mibObjectIdentifier is
 RECOMMENDED as a Scope Field so that it matches the MIB Field Options
 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 mibObjectValue 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 per
 [RFC7011].
 The only extra requirement on a Template Record using one or more
 mibObjectValue Information Elements is that it MUST export the
 required metadata specified in Section 5.3.1 for EACH mibObjectValue
 Information Element.
 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.

Aitken, et al. Standards Track [Page 17] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Figure 4 shows an IPFIX Template Set using 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 = 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 MIB object data (i.e., the value of a MIB object)
       will be exported in the (Options) Data Record.
       This could be any one of the mibObjectValue Information
       Elements defined in Section 11.2.1: mibObjectValueInteger,
       mibObjectValueOctetString, mibObjectValueOID,
       mibObjectValueBits, mibObjectValueIPAddress,
       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 Template and MIB Field Options Data Record.
       See Section 5.3.1.
    Field Length (MIB)
       The length of the encoded MIB object data in the corresponding
       Data Records, in octets.  See [RFC7011] for a detailed
       definition.  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].

Aitken, et al. Standards Track [Page 18] RFC 8038 Exporting MIB Variables with IPFIX May 2017

5.4.2. MIB Field Options Template

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

Aitken, et al. Standards Track [Page 19] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    informationElementIndex
       The second Scope Field is an IPFIX Information Element that
       denotes a zero-based index into the fields defined by a
       Template.  When paired with a "templateId", this uniquely
       references one mibObjectValue Information Element being
       exported.
    mibObjectIdentifier
       An IPFIX Information Element that denotes the 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 [X.690] format.
       Variable-length encoding SHOULD be used with the
       mibObjectIdentifier so that multiple MIB OIDs of different
       lengths 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.

Aitken, et al. Standards Track [Page 20] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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.
    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
 VLEN contains the variable length of the mibObjectIdentifier per
 Section 7 of [RFC7011].

5.4.4. Options Template Containing a mibObjectValue 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 per [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 an Options Template Record using one or
 more mibObjectValue Information Elements 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.

Aitken, et al. Standards Track [Page 21] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Figure 7 shows an IPFIX Options Template Set using an existing IPFIX
 field as a Scope Field and with a mibObjectValueInteger Information
 Element as a non-Scope Field, while Figure 8 shows an IPFIX Options
 Template Set using a mibObjectValueInteger Information Element as a
 Scope Field with an existing IPFIX field as a non-Scope 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 = 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

Aitken, et al. Standards Track [Page 22] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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.
    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-columnar 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, particularly for situations with long-lived Flows.

Aitken, et al. Standards Track [Page 23] RFC 8038 Exporting MIB Variables with IPFIX May 2017

5.4.6. MIB Field Options Template with Extra MIB Object Details

 The OID exported within the mibObjectIdentifier IPFIX Information
 Element provides an OID reference to a MIB object type definition
 that will fully describe the MIB object data being exported.
 However, an Exporting 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.
 The Exporting Process can either include the fields with extra object
 details as part of the MIB Field Options Template or export a
 separate Options Template and a Data Record 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.

Aitken, et al. Standards Track [Page 24] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 The MIB Field Options Template for a non-columnar 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-columnar 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 "IPFIX Information
       Elements" subregistry [IANA-IPFIX] that contains
       informationElementDataType) because the SYNTAX clause could
       contain almost any name.
    mibObjectName
       The textual name of a mibObjectIdentifier object.

Aitken, et al. Standards Track [Page 25] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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 in Data Records specified using a
 regular IPFIX Options Template Record [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 from 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 Options Template Set
                          with Object Details

Aitken, et al. Standards Track [Page 26] RFC 8038 Exporting MIB Variables with IPFIX May 2017

5.5. Use of Field Order in the MIB Field Options Template

 The MIB Field Options Template export makes use of the
 informationElementIndex [IANA-IPFIX] to specify which field in the
 Template the metadata relates to; this avoids any ordering
 constraints on the Data Template.  The mibObjectValue Information
 Elements in an IPFIX export can be in any order in the export packet.
 However, fields used as an INDEX MUST be in the same order as the
 order 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 an 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 mibObjectValue 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.

Aitken, et al. Standards Track [Page 27] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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 items that are required.
 Since the MIB Field Options Template applies for all the Data 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 (Options) Template Record that uses a mibObjectValue
 Information Element.
 When exporting over a Stream Control Transmission Protocol (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 Data Records it depends on MUST be sent as well.
 If a Template is replaced with a new (Options) 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 (Options) 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 (Options)
 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.

Aitken, et al. Standards Track [Page 28] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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 that
 it annotates, except as allowed by the caveat mentioned in
 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 IPFIX Structured
     Data [RFC6313]
 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 IPFIX Structured
 Data [RFC6313].
 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
 Data Record.  In this case, each mibObjectValue Information Element
 must specify which other field(s) in the Template is providing the
 index information.

Aitken, et al. Standards Track [Page 29] RFC 8038 Exporting MIB Variables with IPFIX May 2017

5.8.1. Exporting Conceptual Rows - Indexing

 This document defines two forms of indexing that can be used for
 conceptual row MIB objects:
 Indexing based on IPFIX Structured Data [RFC6313] 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 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 Elements 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 an IPFIX 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 in the MIB Field
 Options Template and Data Set.
 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 sub-identifier to be exported.  To
 make the diagram clearer, the Templates for the MIB Field Options
 Templates are not shown.

Aitken, et al. Standards Track [Page 30] RFC 8038 Exporting MIB Variables with IPFIX May 2017

      +---------------------------+    +------------------------+
      | Data Template             |    | MIB Field Options Data |
      |                           |    |                        |
      | mibObjectValueRow         |<---| OID                    |
      +---------------------------+    +------------------------+
        |
        | +-----------------------+    +------------------------+
        | | Options Template      |    | MIB Field Options Data |
        | |                       |    |                        |
        | | Scope mibObjectValue* |<---| mibSubIdentifier       |
        | |       mibObjectValue* |<---| mibSubIdentifier       |
        | +-----------------------+    +------------------------+
        |             |
        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 indexing based on IPFIX Structured Data [RFC6313] 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 two related OIDs.  There is an
 OID that refers to the table with the 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 sub-identifier
 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.

Aitken, et al. Standards Track [Page 31] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 In this case, the exported Flow will contain a single complete or
 partial row from a table inside a single field of the Data 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 mibSubIdentifier 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 IPFIX Structured Data [RFC6313] subTemplateList format requires
 the Structured Data Type Semantics to be specified.  Unless there is
 a more appropriate option in the "IPFIX Structured Data Types
 Semantics" subregistry [IANA-IPFIX], the "undefined" Structured Data
 Type Semantics can be used.
 Figure 13 shows an IPFIX Template for an IPFIX Structured Data
 [RFC6313] 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 that will 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

Aitken, et al. Standards Track [Page 32] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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 COLUMN3 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Field Length           |0| IE = mibObjectValue COLUMN4 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Field Length           |0| IE = mibObjectValue COLUMN5 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Field Length           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       Figure 14: IPFIX Options Template for a mibObjectValueRow
                with Five Columns and Two 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

Aitken, et al. Standards Track [Page 33] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Where:
    templateId
       The templateId for the MIB option that will be exported.
    mibObjectIdentifier
       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.

Aitken, et al. Standards Track [Page 34] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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, gives the full OID for the object.

Aitken, et al. Standards Track [Page 35] RFC 8038 Exporting MIB Variables with IPFIX May 2017

5.8.3. Exporting Conceptual Rows - AUGMENTS

 SMIv2 defines conceptual rows as having either 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 to either the base table with the
 INDEX clause or a conceptual row with an AUGMENTS clause.  The
 mibSubIdentifier in any MIB Field Options Data Record MUST always
 refer to the OID exported for the mibObjectValueRow Information
 Element.
 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 augmenting conceptual row, the
 Scope Fields of the Template used 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 augmenting
 conceptual rows.  If this is done, then the base table SHOULD be used
 as the main OID for the mibObjectValueRow.

Aitken, et al. Standards Track [Page 36] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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.
 As also specified for mibObjectValueRow (Section 5.8.2), the more
 specific (i.e., full) 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 zero or more
 entries.
 All the other, i.e., non-length, requirements for mibObjectValueRow
 in Section 5.8.2 apply to mibObjectValueTable.
 An overview of this architecture is given in Figure 18.  This
 architecture is similar to the architecture shown in Figure 12.
      +---------------------------+    +------------------------+
      | Data Template             |    | MIB Field Options Data |
      |                           |    |                        |
      | mibObjectValueTable       |<---| OID                    |
      +---------------------------+    +------------------------+
        |
        | +-----------------------+    +------------------------+
        | | Options Template      |    | MIB Field Options Data |
        | |                       |    |                        |
        | | Scope mibObjectValue* |<---| mibSubIdentifier       |
        | |       mibObjectValue* |<---| mibSubIdentifier       |
        | +-----------------------+    +------------------------+
        |             |
        V             V
      +-----------------------------+
      | Data Flows                  |
      |                             |
      | subTemplateList (n entries) |
      |    row 1                    |
      |    ...                      |
      |    row n                    |
      +-----------------------------+
        Figure 18: Architecture for Exporting Conceptual Tables
                       with mibObjectValueTable

Aitken, et al. Standards Track [Page 37] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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, the Options
 Template Set scope may contain either non-index fields or 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.
    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

Aitken, et al. Standards Track [Page 38] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Where:
    mibIndexIndicator
       The MIB Index Indicator IPFIX Information Element that marks
       which fields in the Data 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

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

Aitken, et al. Standards Track [Page 39] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 The Template Record for such a Data Record will provide details for
 the following 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.
    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

Aitken, et al. Standards Track [Page 40] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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 [X.690] as
 "06072B060102010609" in the Data Record, which takes 9 octets.
    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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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

Aitken, et al. Standards Track [Page 41] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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

Aitken, et al. Standards Track [Page 42] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Although the cpmCPUTotal1minRev MIB object is a columnar object in a
 conceptual row, if there is only one 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
 were multiple CPUs, it would be appropriate to include 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 provide details for
 the following 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 1-minute period.

Aitken, et al. Standards Track [Page 43] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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
 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
    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 = 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.

Aitken, et al. Standards Track [Page 44] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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 CPU Load MIB Field Options Data Set
 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; see
 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, because the mibObjectValueGauge and
 mibObjectIdentifier Information Elements are 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 Options Template Set.  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.

Aitken, et al. Standards Track [Page 45] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 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.
  +------------------+-----------------------+---------------------+
  | 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; Figure 29 also
 shows a Data Record formatted as per IPFIX Structured Data [RFC6313]
 and using the "undefined" (= 0xFF) semantic from the "IPFIX
 Structured Data Types Semantics" subregistry [IANA-IPFIX].  Note that
 the OID for ospfNbrEntry has been encoded using ASN.1/BER to
 "06082B060102010E0A01" at 10 octets long.

Aitken, et al. Standards Track [Page 46] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   |       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   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Aitken, et al. Standards Track [Page 47] RFC 8038 Exporting MIB Variables with IPFIX May 2017

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          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
    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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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

Aitken, et al. Standards Track [Page 48] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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: Mapping IF-MIB ID to Name

 The ifTable, defined in the IF-MIB [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.

Aitken, et al. Standards Track [Page 49] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Table 6 shows the fields that will be exported.
      +---------+------------------+-------+-------------------+
      | 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.

Aitken, et al. Standards Track [Page 50] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        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   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Aitken, et al. Standards Track [Page 51] RFC 8038 Exporting MIB Variables with IPFIX May 2017

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          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

Aitken, et al. Standards Track [Page 52] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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

Aitken, et al. Standards Track [Page 53] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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

Aitken, et al. Standards Track [Page 54] RFC 8038 Exporting MIB Variables with IPFIX May 2017

6.5. Exporting a Columnar Object: 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 IPFIX Structured Data [RFC6313] method, the mibIndexIndicator
 method can be used to provide the relationship between fields.
 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 ipIfStatsTable conceptual table.  This is comprised of
 ipIfStatsEntry conceptual rows.
 The ipIfStatsTable conceptual table is indexed by 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 that ipIfStatsIfIndex has been reduced-size encoded to 2 octets
 in the following example.  An exporting device with more interfaces
 would use the full length.

Aitken, et al. Standards Track [Page 55] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Figure 33 shows the exported Options Template Set.
    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 Index Objects
 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 index objects.
    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 a MIB Field Options Template for an Indexed
                   MIB Object with Two Index Objects

Aitken, et al. Standards Track [Page 56] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Figure 35 shows the exported MIB Field Options Data used to export
 the required mibObjectValue Information Element metadata.  Note that
 the first two Data Records have all their mibIndexIndicator bits set
 to 0.  The third mibIndexIndicator has the value "00000011" to show
 that the first two fields in the Data Record are the INDEXes 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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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 00000011 |  VLEN = 12   | mibObjectIdentifier      ...  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  "1.3.6.1.2.1.4.31.3.1.12"               ...  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                   060A2B06010201041F03010C               ...  |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   Figure 35: Example of a MIB Field Options Data Set for an Indexed
                   MIB Object with Two Index Objects

Aitken, et al. Standards Track [Page 57] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Figure 36 shows the Data Records that export the values of the three
 mibObjectValue Information Elements.
    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 a MIB Data Set for an Indexed MIB Object
                        with Two Index Objects

6.6. Exporting a Columnar Object Indexed by Information Elements:

    ifOutQLen
 If a Packet Sampling (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 | PKT LEN |    OUTPUT    | OUTPUT QUEUE 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).

Aitken, et al. Standards Track [Page 58] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 This relationship between the ifOutQLen field and the index field is
 exported using mibIndexIndicator in the MIB Field Options Template.
 The value of "00001000" flags the index fields concisely.
 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 ifOutQLen.  Figures 38 and 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

Aitken, et al. Standards Track [Page 59] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 703       | informationElementIndex = 4   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |Index 00001000  | 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.

Aitken, et al. Standards Track [Page 60] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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

Aitken, et al. Standards Track [Page 61] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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 of the conceptual row that was exported per
 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 (Section 6.3).  Figure 43 shows
 the example data for two OSPF neighbors.  Although these have
 identical INDEX/scope values, the context information indicates that
 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.

Aitken, et al. Standards Track [Page 62] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |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   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Aitken, et al. Standards Track [Page 63] RFC 8038 Exporting MIB Variables with IPFIX May 2017

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          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       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 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          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Template ID = 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

Aitken, et al. Standards Track [Page 64] RFC 8038 Exporting MIB Variables with IPFIX May 2017

    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 = 192.0.2.2               |        ...    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       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 should also be configurable.  If a
 non-default context is used, then it should be associated with the
 fields as per Section 5.6.

Aitken, et al. Standards Track [Page 65] RFC 8038 Exporting MIB Variables with IPFIX May 2017

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:
 o  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.
 o  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.
 o  It should be noted that, because reduced-size encoding MAY be used
    by the Exporting Process, the Collecting Process cannot assume
    that a received size for a field is the maximum size it should
    expect for that field.
 o  If a Collecting Process receives a MIB Object Identifier that it
    cannot decode, it MAY log a warning.
 o  A Collecting Process MUST support the three 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 a mapping of
 interface ID to interface name using IPFIX Options Templates.  This
 could be expanded to include the ifInUcastPkts MIB object as defined
 in the IF-MIB [RFC2863], indexed using the ingressInterface
 Information Element.  This would provide the input statistics for
 each interface; these statistics can be compared to the Flow
 information to ensure that the sampling rate is as expected, or, in
 the absence of sampling, to ensure that all expected packets are
 being monitored.

Aitken, et al. Standards Track [Page 66] RFC 8038 Exporting MIB Variables with IPFIX May 2017

10. Security Considerations

 For this extension to the IPFIX protocol, the same security
 considerations as those 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
 enforce SNMP access control rules [RFC3415] as required by the SNMP
 architecture [RFC3411].
 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 that are
 included in IPFIX Data Records are objects that the receiving
 Collector is allowed to receive.  Note that multiple users may have
 access to the data from the 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 anonymization techniques per [RFC6235]
 if the information is anonymizable.  Consumers of exported data
 should therefore be able to handle the kinds of data modifications
 that are described in [RFC6235].

Aitken, et al. Standards Track [Page 67] RFC 8038 Exporting MIB Variables with IPFIX May 2017

11. IANA Considerations

11.1. New IPFIX Semantics

 New IPFIX semantics have been allocated in IANA's IPFIX registry
 [IANA-IPFIX] per Section 6 of [RFC7012], as defined in the
 subsections 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 but SNMP counters do not.
 IANA has assigned value 7 to snmpCounter.

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.
 IANA has assigned value 8 to snmpGauge.

Aitken, et al. Standards Track [Page 68] RFC 8038 Exporting MIB Variables with IPFIX May 2017

11.2. New IPFIX Information Elements

 The new Information Elements in Table 10 have been allocated in
 IANA's IPFIX registry [IANA-IPFIX], as defined in the subsections
 below.
 In each case, the "Units" and "Range" have been left blank, since
 these are not applicable.
               +-----------+---------------------------+
               | ElementId | Name                      |
               +-----------+---------------------------+
               | 434       | mibObjectValueInteger     |
               | 435       | mibObjectValueOctetString |
               | 436       | mibObjectValueOID         |
               | 437       | mibObjectValueBits        |
               | 438       | mibObjectValueIPAddress   |
               | 439       | mibObjectValueCounter     |
               | 440       | mibObjectValueGauge       |
               | 441       | mibObjectValueTimeTicks   |
               | 442       | mibObjectValueUnsigned    |
               | 443       | mibObjectValueTable       |
               | 444       | mibObjectValueRow         |
               | 445       | mibObjectIdentifier       |
               | 446       | mibSubIdentifier          |
               | 447       | mibIndexIndicator         |
               | 448       | mibCaptureTimeSemantics   |
               | 449       | mibContextEngineID        |
               | 450       | mibContextName            |
               | 451       | mibObjectName             |
               | 452       | mibObjectDescription      |
               | 453       | mibObjectSyntax           |
               | 454       | mibModuleName             |
               +-----------+---------------------------+
                  Table 10: New Information Elements

11.2.1. New MIB Object Value Information Elements

11.2.1.1. mibObjectValueInteger

 A new Information Element "mibObjectValueInteger" has been allocated
 in IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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

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    Element is used for MIB objects with the Base syntax of Integer32
    and INTEGER with IPFIX reduced-size encoding used as required.
    The value is encoded as per the standard IPFIX Abstract Data Type
    of signed32.
    Abstract Data Type: signed32
    Data Type Semantics: quantity
    ElementId: 434
    Status: current
    Reference: RFC 8038

11.2.1.2. mibObjectValueOctetString

 A new Information Element "mibObjectValueOctetString" has been
 allocated in IANA's IPFIX registry [IANA-IPFIX], with the following
 definition:
    Description: An IPFIX Information Element that 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: 435
    Status: current
    Reference: RFC 8038

11.2.1.3. mibObjectValueOID

 A new Information Element "mibObjectValueOID" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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

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    Information Element is used for MIB objects with the Base syntax
    of OBJECT IDENTIFIER.  Note: In this case, the
    "mibObjectIdentifier" defines which MIB object is being exported,
    and the "mibObjectValueOID" field will contain the OID value of
    that MIB object.  The mibObjectValueOID Information Element is
    encoded as ASN.1/BER [X.690] in an octetArray.
    Abstract Data Type: octetArray
    Data Type Semantics: default
    ElementId: 436
    Status: current
    Reference: RFC 8038

11.2.1.4. mibObjectValueBits

 A new Information Element "mibObjectValueBits" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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 the end of the octetArray MUST be set to 0.
    Abstract Data Type: octetArray
    Data Type Semantics: flags
    ElementId: 437
    Status: current
    Reference: RFC 8038

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11.2.1.5. mibObjectValueIPAddress

 A new Information Element "mibObjectValueIPAddress" has been
 allocated in IANA's IPFIX registry [IANA-IPFIX], with the following
 definition:
    Description: An IPFIX Information Element that denotes that the
    IPv4 address 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 IpAddress.  The value is encoded as per the standard IPFIX
    Abstract Data Type of ipv4Address.
    Abstract Data Type: ipv4Address
    Data Type Semantics: default
    ElementId: 438
    Status: current
    Reference: RFC 8038

11.2.1.6. mibObjectValueCounter

 A new Information Element "mibObjectValueCounter" has been allocated
 in IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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: 439
    Status: current
    Reference: RFC 8038

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11.2.1.7. mibObjectValueGauge

 A new Information Element "mibObjectValueGauge" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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 unsigned32.  This value represents a non-negative integer that
    may increase or decrease but that shall never exceed a maximum
    value or fall below a minimum value.
    Abstract Data Type: unsigned32
    Data Type Semantics: snmpGauge
    ElementId: 440
    Status: current
    Reference: RFC 8038

11.2.1.8. mibObjectValueTimeTicks

 A new Information Element "mibObjectValueTimeTicks" has been
 allocated in IANA's IPFIX registry [IANA-IPFIX], with the following
 definition:
    Description: An IPFIX Information Element that 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: quantity
    ElementId: 441
    Status: current
    Reference: RFC 8038

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11.2.1.9. mibObjectValueUnsigned

 A new Information Element "mibObjectValueUnsigned" has been allocated
 in IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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 unsigned32 with IPFIX reduced-size encoding used as required.
    The value is encoded as per the standard IPFIX Abstract Data Type
    of unsigned32.
    Abstract Data Type: unsigned32
    Data Type Semantics: quantity
    ElementId: 442
    Status: current
    Reference: RFC 8038

11.2.1.10. mibObjectValueTable

 A new Information Element "mibObjectValueTable" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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 OF.  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: 443
    Status: current
    Reference: RFC 8038

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11.2.1.11. mibObjectValueRow

 A new Information Element "mibObjectValueRow" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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: 444
    Status: current
    Reference: RFC 8038

11.2.2. New MIB Field Options Information Elements

11.2.2.1. mibObjectIdentifier

 A new Information Element "mibObjectIdentifier" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An IPFIX Information Element that 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 [X.690].
    Abstract Data Type: octetArray
    Data Type Semantics: default
    ElementId: 445

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    Status: current
    Reference: RFC 8038

11.2.2.2. mibSubIdentifier

 A new Information Element "mibSubIdentifier" has been 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: 446
    Status: current
    Reference: RFC 8038

11.2.2.3. mibIndexIndicator

 A new Information Element "mibIndexIndicator" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: A set of bit fields that 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 least
    significant bit representing the n-th Information Element.  A bit
    set to 1 indicates that the corresponding Information Element is
    an index of the columnar object represented by the mibObjectValue.
    A bit set to 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.

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    Abstract Data Type: unsigned64
    Data Type Semantics: flags
    ElementId: 447
    Status: current
    Reference: RFC 8038

11.2.2.4. mibCaptureTimeSemantics

 A new Information Element "mibCaptureTimeSemantics" has been
 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 refers to the
    Timestamp fields included in the same Data 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 is important to know the exact sampling
    time, then an additional observationTime* element should be paired
    with the OID using IPFIX Structured Data [RFC6313].  Similarly, if
    different MIB capture times apply to different mibObjectValue
    elements within the Data Record, then individual
    mibCaptureTimeSemantics Information Elements should be paired with
    each OID using IPFIX Structured Data.

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    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
    ElementId: 448
    Status: current
    Reference: RFC 8038

11.2.2.5. mibContextEngineID

 A new Information Element "mibContextEngineID" has been 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: 449
    Status: current
    Reference: RFC 8038

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11.2.2.6. mibContextName

 A new Information Element "mibContextName" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: An Information Element that 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: 450
    Status: current
    Reference: RFC 8038

11.2.3. New MIB Type Information Elements

11.2.3.1. mibObjectName

 A new Information Element "mibObjectName" has been 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: 451
    Status: current
    Reference: RFC 8038

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11.2.3.2. mibObjectDescription

 A new Information Element "mibObjectDescription" has been allocated
 in IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: The value of the DESCRIPTION clause of a MIB object
    type definition.
    Abstract Data Type: string
    Data Type Semantics: default
    ElementId: 452
    Status: current
    Reference: RFC 8038

11.2.3.3. mibObjectSyntax

 A new Information Element "mibObjectSyntax" has been allocated in
 IANA's IPFIX registry [IANA-IPFIX], with the following definition:
    Description: The value of the SYNTAX clause of a MIB object type
    definition, which may include a textual convention or sub-typing.
    See [RFC2578].
    Abstract Data Type: string
    Data Type Semantics: default
    ElementId: 453
    Status: current
    Reference: RFC 8038

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11.2.3.4. mibModuleName

 A new Information Element "mibModuleName" has been 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: 454
    Status: current
    Reference: RFC 8038

12. References

12.1. Normative References

 [IANA-IPFIX]
            IANA, "IP Flow Information Export (IPFIX) Entities",
            <http://www.iana.org/assignments/ipfix/>.
 [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>.

Aitken, et al. Standards Track [Page 81] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 [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>.
 [X.690]    International Telecommunication Union, "Information
            Technology - ASN.1 encoding rules: Specification of Basic
            Encoding Rules (BER), Canonical Encoding Rules (CER) and
            Distinguished Encoding Rules (DER)", ITU-T Recommendation
            X.690, ISO/IEC 8825-1, August 2015,
            <https://www.itu.int/rec/T-REC-X.690>.

12.2. Informative References

 [CISCO-PROCESS-MIB]
            Cisco Systems Inc., "CISCO-PROCESS-MIB.my: MIB for CPU and
            process statistics", <ftp://ftp.cisco.com/pub/mibs/v2/
            CISCO-PROCESS-MIB.my>.
 [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>.

Aitken, et al. Standards Track [Page 82] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 [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>.
 [RFC4960]  Stewart, R., Ed., "Stream Control Transmission Protocol",
            RFC 4960, DOI 10.17487/RFC4960, September 2007,
            <http://www.rfc-editor.org/info/rfc4960>.
 [RFC5102]  Quittek, J., Bryant, S., Claise, B., Aitken, P., and J.
            Meyer, "Information Model for IP Flow Information Export",
            RFC 5102, DOI 10.17487/RFC5102, January 2008,
            <http://www.rfc-editor.org/info/rfc5102>.
 [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>.

Aitken, et al. Standards Track [Page 83] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 [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>.

Acknowledgments

 The authors would like to thank Andrew Johnson for his collaboration
 on the first draft version of this document, 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.

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
 Benoit Claise
 Cisco Systems, Inc.
 De Kleetlaan 6a b1
 Diegem  1813
 Belgium
 Phone: +32 2 704 5622
 Email: bclaise@cisco.com

Aitken, et al. Standards Track [Page 84] RFC 8038 Exporting MIB Variables with IPFIX May 2017

 Srikar B S
 Mojo Networks, Inc.
 S. No. 7, Pinnac House II
 Kothrud, Pune  411038
 India
 Phone: +91 94 4847 6672
 Email: srikarbs@gmail.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

Aitken, et al. Standards Track [Page 85]

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