Network Working Group B. Claise, Ed. Internet Draft Cisco Systems, Inc. Obsoletes: 5102 B. Trammell, Ed. Category: Standards Track ETH Zurich Expires: September 9, 2012 March 8, 2012 Information Model for IP Flow Information eXport (IPFIX) draft-ietf-ipfix-information-model-rfc5102bis-01.txt Abstract This memo defines an overview of the information model for the IP Flow Information eXport (IPFIX) protocol. It is used by the IPFIX protocol for encoding measured traffic information and information related to the traffic Observation Point, the traffic Metering Process, and the Exporting Process. Although developed for the IPFIX protocol, the model is defined in an open way that easily allows using it in other protocols, interfaces, and applications. This document obsoletes RFC 5102. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on March 23, 2012. Copyright Notice Copyright (c) 2012 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 Claise, Trammell Standards Track [Page 1] Internet-Draft IPFIX Information Model January 18, 2012 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Changes since RFC 5102 . . . . . . . . . . . . . . . . . . 4 1.2. IPFIX Documents Overview . . . . . . . . . . . . . . . . . 5 2. Properties of IPFIX Protocol Information Elements . . . . . . 6 2.1. Information Elements Specification Template . . . . . . . 6 2.2. Scope of Information Elements . . . . . . . . . . . . . . 7 2.3. Naming Conventions for Information Elements . . . . . . . 8 3. Type Space . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1. Abstract Data Types . . . . . . . . . . . . . . . . . . . 9 3.1.1. unsigned8 . . . . . . . . . . . . . . . . . . . . . . 9 3.1.2. unsigned16 . . . . . . . . . . . . . . . . . . . . . . 9 3.1.3. unsigned32 . . . . . . . . . . . . . . . . . . . . . . 9 3.1.4. unsigned64 . . . . . . . . . . . . . . . . . . . . . . 9 3.1.5. signed8 . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.6. signed16 . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.7. signed32 . . . . . . . . . . . . . . . . . . . . . . . 9 3.1.8. signed64 . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.9. float32 . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.10. float64 . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.11. boolean . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.12. macAddress . . . . . . . . . . . . . . . . . . . . . 10 3.1.13. octetArray . . . . . . . . . . . . . . . . . . . . . 10 3.1.14. string . . . . . . . . . . . . . . . . . . . . . . . 10 3.1.15. dateTimeSeconds . . . . . . . . . . . . . . . . . . . 10 3.1.16. dateTimeMilliseconds . . . . . . . . . . . . . . . . 10 3.1.17. dateTimeMicroseconds . . . . . . . . . . . . . . . . 10 3.1.18. dateTimeNanoseconds . . . . . . . . . . . . . . . . . 11 3.1.19. ipv4Address . . . . . . . . . . . . . . . . . . . . . 11 3.1.20. ipv6Address . . . . . . . . . . . . . . . . . . . . . 11 3.2. Data Type Semantics . . . . . . . . . . . . . . . . . . . 11 3.2.1. quantity . . . . . . . . . . . . . . . . . . . . . . . 11 3.2.2. totalCounter . . . . . . . . . . . . . . . . . . . . . 11 3.2.3. deltaCounter . . . . . . . . . . . . . . . . . . . . . 12 3.2.4. identifier . . . . . . . . . . . . . . . . . . . . . . 12 3.2.5. flags . . . . . . . . . . . . . . . . . . . . . . . . 12 4. Information Element Identifiers . . . . . . . . . . . . . . . 12 5. Information Elements . . . . . . . . . . . . . . . . . . . . . 16 5.1. Identifiers . . . . . . . . . . . . . . . . . . . . . . . 18 5.3. Metering and Exporting Process Statistics . . . . . . . . 19 Claise, Trammell Standards Track [Page 2] Internet-Draft IPFIX Information Model January 18, 2012 5.4. IP Header Fields . . . . . . . . . . . . . . . . . . . . . 19 5.5. Transport Header Fields . . . . . . . . . . . . . . . . . 20 5.6. Sub-IP Header Fields . . . . . . . . . . . . . . . . . . . 21 5.7. Derived Packet Properties . . . . . . . . . . . . . . . . 21 5.9. Flow Timestamps . . . . . . . . . . . . . . . . . . . . . 21 5.10. Per-Flow Counters . . . . . . . . . . . . . . . . . . . . 22 5.11. Miscellaneous Flow Properties . . . . . . . . . . . . . . 23 5.12. Padding . . . . . . . . . . . . . . . . . . . . . . . . . 24 6. Extending the Information Model . . . . . . . . . . . . . . . 24 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 24 7.1. IPFIX Information Elements . . . . . . . . . . . . . . . . 24 7.2. MPLS Label Type Identifier . . . . . . . . . . . . . . . . 25 7.3. XML Namespace and Schema . . . . . . . . . . . . . . . . . 25 8. Security Considerations . . . . . . . . . . . . . . . . . . . 26 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 27 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 27 10.1. Normative References . . . . . . . . . . . . . . . . . . 27 10.2. Informative References . . . . . . . . . . . . . . . . . 27 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 30 OPEN ISSUES: * "revision", "date", "enterprise-specific" added from [IPFIX-IE- DOCTORS]. So we need to change the section 2.1. Harmonize with IE- DOCTORS section 12. * Do we want to have a new column in IANA for the max length for string, arrary, and potentially others? DISCUSSION on the mailing list Clarified the dateTimeSeconds and dateTimeMilliseconds. "excluding leap seconds" in the current definition is not clear according to Paul Aitken. Make sure that the language in section 4.1 of IPFIX-IE-DOCTORS is copied over in this document. For example: "should be descriptive" -> "SHOULD be descriptive". 1. Introduction The IP Flow Information eXport (IPFIX) protocol serves for transmitting information related to measured IP traffic over the Internet. The protocol specification in [RFC5101bis] defines how Information Elements are transmitted. For Information Elements, it specifies the encoding of a set of basic data types. However, the list of Information Elements that can be transmitted by the protocol, Claise, Trammell Standards Track [Page 3] Internet-Draft IPFIX Information Model January 18, 2012 such as Flow attributes (source IP address, number of packets, etc.) and information about the Metering and Exporting Process (packet Observation Point, sampling rate, Flow timeout interval, etc.), is not specified in [RFC5101bis]. This document complements the IPFIX protocol specification by providing an overview of the IPFIX information model and specifying data types for it. IPFIX-specific terminology used in this document is defined in Section 2 of [RFC5101bis]. As in [RFC5101bis], these IPFIX-specific terms have the first letter of a word capitalized when used in this document. The use of the term 'information model' is not fully in line with the definition of this term in [RFC3444]. The IPFIX information model does not specify relationships between Information Elements, but also it does not specify a concrete encoding of Information Elements. Besides the encoding used by the IPFIX protocol, other encodings of IPFIX Information Elements can be applied, for example, XML-based encodings. The main part of this document is Section 5, which displays some of Information Elements to be transmitted by the IPFIX protocol. Section 2 defines a template for specifying IPFIX Information Elements in Section 5. Section 3 defines the set of abstract data types that are available for IPFIX Information Elements. Section 6 discusses extensibility of the IPFIX information model. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 1.1. Changes since RFC 5102 This document obsoletes the Proposed Standard revision of the IPFIX Protocol Specification [RFC5102]. The following changes have been made to this document with respect to the previous document: - EDITOR'S NOTE: not sure if we need to this information. All errata at http://www.rfc-editor.org/errata_search.php?rfc=5102 till March 8th are covered Errata ID: 1307 (technical) Errata ID: 1492 (technical) Errata ID: 1736 (technical) Errata ID: 2879 (editorial) Errata ID: 3101 (editorial) Errata ID: 2944, which updates 1737 (technical) Errata ID: 2945, which updates 1738 (technical) Errata ID: 2946, which updates 1739 (technical) Claise, Trammell Standards Track [Page 4] Internet-Draft IPFIX Information Model January 18, 2012 - Updated the reference to RFC5101bis - Clarified the time-related IEs - Since this document is based on the IPFIX Draft Standard [RFC5101bis], all improvements have been taken into account. For example, the timestamps. - Instead of repeating every Information Elements from [RFC5102], a reference to the IPFIX IANA registry [IPFIX-IANA] is introduced. However the category in section 5 have been kept. - The appendix A and B have been removed - Introduced [IPFIX-IE-DOCTORS] 1.2. IPFIX Documents Overview The IPFIX protocol provides network administrators with access to IP flow information. The architecture for the export of measured IP flow information out of an IPFIX Exporting Process to a Collecting Process is defined in [RFC5470], per the requirements defined in [RFC3917]. The IPFIX specifications [RFC5101bis] document specifies how IPFIX data records and templates are carried via a number of transport protocols from IPFIX Exporting Processes to IPFIX Collecting Processes. Four IPFIX optimizations/extensions are currently specified: a bandwidth saving method for the IPFIX protocol in [RFC5473], an efficient method for exporting bidirectional flow in [RFC5103], a method for the definition and export of complex data structures in [RFC6313], and the specification of the Protocol for IPFIX Mediations [IPFIX-MED-PROTO] based on the IPIFX Mediation Framework [RFC6183]. IPFIX has a formal description of IPFIX Information Elements, their name, type and additional semantic information, as specified in this document, with the export of the Information Element types specified in [RFC5610]. [IPFIX-CONF] specifies a data model for configuring and monitoring IPFIX and PSAMP compliant devices using the NETCONF protocol, while the [RFC5815bis] specifies a MIB module for monitoring. In terms of development, [RFC5153] provides guidelines for the implementation and use of the IPFIX protocol, while [RFC5471] provides guidelines for testing. Claise, Trammell Standards Track [Page 5] Internet-Draft IPFIX Information Model January 18, 2012 Finally, [RFC5472] describes what type of applications can use the IPFIX protocol and how they can use the information provided. It furthermore shows how the IPFIX framework relates to other architectures and frameworks. 2. Properties of IPFIX Protocol Information Elements 2.1. Information Elements Specification Template Information in messages of the IPFIX protocol is modeled in terms of Information Elements of the IPFIX information model. The IPFIX Information Elements mentioned in Section 5 are specified in [IPFIX- IANA]. For specifying these Information Elements, a template is used that is described below. All Information Elements specified for the IPFIX protocol either in this document or by any future extension MUST have the following properties defined: name - A unique and meaningful name for the Information Element. elementId - A numeric identifier of the Information Element. If this identifier is used without an enterprise identifier (see [RFC5101bis] and enterpriseId below), then it is globally unique and the list of allowed values is administered by IANA. It is used for compact identification of an Information Element when encoding Templates in the protocol. description - The semantics of this Information Element. Describes how this Information Element is derived from the Flow or other information available to the observer. dataType - One of the types listed in Section 3.1 of this document or in a future extension of the information model. The type space for attributes is constrained to facilitate implementation. The existing type space does however encompass most basic types used in modern programming languages, as well as some derived types (such as ipv4Address) that are common to this domain and useful to distinguish. status - The status of the specification of this Information Element. Allowed values are 'current', 'deprecated', and 'obsolete'. Enterprise-specific Information Elements MUST have the following property defined: enterpriseId - Enterprises may wish to define Information Elements without registering them with IANA, for example, for Claise, Trammell Standards Track [Page 6] Internet-Draft IPFIX Information Model January 18, 2012 enterprise-internal purposes. For such Information Elements, the Information Element identifier described above is not sufficient when the Information Element is used outside the enterprise. If specifications of enterprise-specific Information Elements are made public and/or if enterprise-specific identifiers are used by the IPFIX protocol outside the enterprise, then the enterprise-specific identifier MUST be made globally unique by combining it with an enterprise identifier. Valid values for the enterpriseId are defined by IANA as Structure of Management Information (SMI) network management private enterprise codes. They are defined at http://www.iana.org/assignments/enterprise- numbers. All Information Elements specified for the IPFIX protocol either in this document or by any future extension MAY have the following properties defined: dataTypeSemantics - The integral types may be qualified by additional semantic details. Valid values for the data type semantics are specified in Section 3.2 of this document or in a future extension of the information model. units - If the Information Element is a measure of some kind, the units identify what the measure is. range - Some Information Elements may only be able to take on a restricted set of values that can be expressed as a range (e.g., 0 through 511 inclusive). If this is the case, the valid inclusive range should be specified. reference - Identifies additional specifications that more precisely define this item or provide additional context for its use. 2.2. Scope of Information Elements By default, most Information Elements have a scope specified in their definitions. o The Information Elements defined in Sections 5.2 and 5.3 have a default of "a specific Metering Process" or of "a specific Exporting Process", respectively. o The Information Elements defined in Sections 5.4-5.11 have a scope of "a specific Flow". Within Data Records defined by Option Templates, the IPFIX protocol allows further limiting of the Information Element scope. The new scope is specified by one or more scope fields and defined as the Claise, Trammell Standards Track [Page 7] Internet-Draft IPFIX Information Model January 18, 2012 combination of all specified scope values; see Section 3.4.2.1 on IPFIX scopes in [RFC5101bis]. 2.3. Naming Conventions for Information Elements The following naming conventions were used for naming Information Elements in this document. It is recommended that extensions of the model use the same conventions. o Names of Information Elements should be descriptive. o Names of Information Elements that are not enterprise-specific MUST be unique within the IPFIX information model. Enterprise-specific Information Elements SHOULD be prefixed with a vendor name. o Names of Information Elements start with non-capitalized letters. o Composed names use capital letters for the first letter of each component (except for the first one). All other letters are non-capitalized, even for acronyms. Exceptions are made for acronyms containing non-capitalized letter, such as 'IPv4' and 'IPv6'. Examples are sourceMacAddress and destinationIPv4Address. o Middleboxes [RFC3234] may change Flow properties, such as the Differentiated Service Code Point (DSCP) value or the source IP address. If an IPFIX Observation Point is located in the path of a Flow before one or more middleboxes that potentially modify packets of the Flow, then it may be desirable to also report Flow properties after the modification performed by the middleboxes. An example is an Observation Point before a packet marker changing a packet's IPv4 Type of Service (TOS) field that is encoded in Information Element ipClassOfService. Then the value observed and reported by Information Element ipClassOfService is valid at the Observation Point, but not after the packet passed the packet marker. For reporting the change value of the TOS field, the IPFIX information model uses Information Elements that have a name prefix "post", for example, "postIpClassOfService". Information Elements with prefix "post" report on Flow properties that are not necessarily observed at the Observation Point, but which are obtained within the Flow's Observation Domain by other means considered to be sufficiently reliable, for example, by analyzing the packet marker's marking tables. 3. Type Space This section describes the abstract data types that can be used for the specification of IPFIX Information Elements in Section 4. Claise, Trammell Standards Track [Page 8] Internet-Draft IPFIX Information Model January 18, 2012 Section 3.1 describes the set of abstract data types. Abstract data types unsigned8, unsigned16, unsigned32, unsigned64, signed8, signed16, signed32, and signed64 are integral data types. As described in Section 3.2, their data type semantics can be further specified, for example, by 'totalCounter', 'deltaCounter', 'identifier', or 'flags'. 3.1. Abstract Data Types This section describes the set of valid abstract data types of the IPFIX information model. Note that further abstract data types may be specified by future extensions of the IPFIX information model. 3.1.1. unsigned8 The type "unsigned8" represents a non-negative integer value in the range of 0 to 255. 3.1.2. unsigned16 The type "unsigned16" represents a non-negative integer value in the range of 0 to 65535. 3.1.3. unsigned32 The type "unsigned32" represents a non-negative integer value in the range of 0 to 4294967295. 3.1.4. unsigned64 The type "unsigned64" represents a non-negative integer value in the range of 0 to 18446744073709551615. 3.1.5. signed8 The type "signed8" represents an integer value in the range of -128 to 127. 3.1.6. signed16 The type "signed16" represents an integer value in the range of -32768 to 32767. 3.1.7. signed32 The type "signed32" represents an integer value in the range of -2147483648 to 2147483647. Claise, Trammell Standards Track [Page 9] Internet-Draft IPFIX Information Model January 18, 2012 3.1.8. signed64 The type "signed64" represents an integer value in the range of -9223372036854775808 to 9223372036854775807. 3.1.9. float32 The type "float32" corresponds to an IEEE single-precision 32-bit floating point type as defined in [IEEE.754.1985]. 3.1.10. float64 The type "float64" corresponds to an IEEE double-precision 64-bit floating point type as defined in [IEEE.754.1985]. 3.1.11. boolean The type "boolean" represents a binary value. The only allowed values are "true" and "false". 3.1.12. macAddress The type "macAddress" represents a string of 6 octets. 3.1.13. octetArray The type "octetArray" represents a finite-length string of octets. 3.1.14. string The type "string" represents a finite-length string of valid characters from the Unicode character encoding set [ISO.10646-1.1993]. Unicode allows for ASCII [ISO.646.1991] and many other international character sets to be used. 3.1.15. dateTimeSeconds The type "dateTimeSeconds" represents a time value in units of seconds since the UNIX epoch, 1 January 1970 at 00:00 coordinated universal time (UTC), excluding leap seconds. 3.1.16. dateTimeMilliseconds The type "dateTimeSeconds" represents a time value in units of milliseconds since the UNIX epoch, 1 January 1970 at 00:00 coordinated universal time (UTC), excluding leap seconds. 3.1.17. dateTimeMicroseconds Claise, Trammell Standards Track [Page 10] Internet-Draft IPFIX Information Model January 18, 2012 The type "dateTimeMicroseconds" represents a time value with microsecond precision according to the NTP Timestamp format as defined in section 6 of [RFC5905]. This field is made up of two unsigned 32-bit integers, Seconds and Fraction. The Seconds field is the number of seconds since the NTP epoch, 1 January 1900 at 00:00 UTC. The Fraction field is the fractional number of seconds in units of 1/(2^32) seconds (approximately 233 picoseconds). 3.1.18. dateTimeNanoseconds The type "dateTimeMicroseconds" represents a time value with nanosecond precision according to the NTP Timestamp format as defined in section 6 of [RFC5905]. This field is made up of two unsigned 32- bit integers, Seconds and Fraction. The Seconds field is the number of seconds since the NTP epoch, 1 January 1900 at 00:00 UTC. The Fraction field is the fractional number of seconds in units of 1/(2^32) seconds (approximately 233 picoseconds). 3.1.19. ipv4Address The type "ipv4Address" represents a value of an IPv4 address. 3.1.20. ipv6Address The type "ipv6Address" represents a value of an IPv6 address. 3.2. Data Type Semantics This section describes the set of valid data type semantics of the IPFIX information model. Note that further data type semantics may be specified by future extensions of the IPFIX information model. 3.2.1. quantity A quantity value represents a discrete measured value pertaining to the record. This is distinguished from counters that represent an ongoing measured value whose "odometer" reading is captured as part of a given record. If no semantic qualifier is given, the Information Elements that have an integral data type should behave as a quantity. 3.2.2. totalCounter An integral value reporting the value of a counter. Counters are unsigned and wrap back to zero after reaching the limit of the type. For example, an unsigned64 with counter semantics will continue to increment until reaching the value of 2**64 - 1. At this point, the next increment will wrap its value to zero and continue counting from Claise, Trammell Standards Track [Page 11] Internet-Draft IPFIX Information Model January 18, 2012 zero. The semantics of a total counter is similar to the semantics of counters used in SNMP, such as Counter32 defined in RFC 2578 [RFC2578]. The only difference between total counters and counters used in SNMP is that the total counters have an initial value of 0. A total counter counts independently of the export of its value. 3.2.3. deltaCounter An integral value reporting the value of a counter. Counters are unsigned and wrap back to zero after reaching the limit of the type. For example, an unsigned64 with counter semantics will continue to increment until reaching the value of 2**64 - 1. At this point, the next increment will wrap its value to zero and continue counting from zero. The semantics of a delta counter is similar to the semantics of counters used in SNMP, such as Counter32 defined in RFC 2578 [RFC2578]. The only difference between delta counters and counters used in SNMP is that the delta counters have an initial value of 0. A delta counter is reset to 0 each time its value is exported. 3.2.4. identifier An integral value that serves as an identifier. Specifically, mathematical operations on two identifiers (aside from the equality operation) are meaningless. For example, Autonomous System ID 1 * Autonomous System ID 2 is meaningless. 3.2.5. flags An integral value that actually represents a set of bit fields. Logical operations are appropriate on such values, but not other mathematical operations. Flags should always be of an unsigned type. 4. Information Element Identifiers All Information Elements defined in the IANA IPFIX Information Element registry [IPFIX-IANA] have their identifiers assigned by IANA. The value of these identifiers is in the range of 1-32767. Within this range, Information Element identifier values in the sub-range of 1-127 are compatible with field types used by NetFlow version 9 [RFC3954]. Claise, Trammell Standards Track [Page 12] Internet-Draft IPFIX Information Model January 18, 2012 +---------------------------------+---------------------------------+ | Range of IANA-assigned | Description | | Information Element identifiers | | +---------------------------------+---------------------------------+ | 0 | Reserved. | | 1-127 | Information Element identifiers | | | compatible with NetFlow version | | | 9 field types [RFC3954]. | | 128-32767 | Further Information Element | | | identifiers. | +---------------------------------+---------------------------------+ Enterprise-specific Information Element identifiers have the same range of 1-32767, but they are coupled with an additional enterprise identifier. For enterprise-specific Information Elements, Information Element identifier 0 is also reserved. Enterprise-specific Information Element identifiers can be chosen by an enterprise arbitrarily within the range of 1-32767. The same identifier may be assigned by other enterprises for different purposes. Still, Collecting Processes can distinguish these Information Elements because the Information Element identifier is coupled with an enterprise identifier. Enterprise identifiers MUST be registered as SMI network management private enterprise code numbers with IANA. The registry can be found at http://www.iana.org/assignments/enterprise-numbers. The following list gives an overview of the Information Element identifiers that are specified in Section 5 and are compatible with field types used by NetFlow version 9 [RFC3954]. Claise, Trammell Standards Track [Page 13] Internet-Draft IPFIX Information Model January 18, 2012 +----+----------------------------+-------+-------------------------+ | ID | Name | ID | Name | +----+----------------------------+-------+-------------------------+ | 1 | octetDeltaCount | 43 | RESERVED | | 2 | packetDeltaCount | 44 | sourceIPv4Prefix | | 3 | RESERVED | 45 | destinationIPv4Prefix | | 4 | protocolIdentifier | 46 | mplsTopLabelType | | 5 | ipClassOfService | 47 | mplsTopLabelIPv4Address | | 6 | tcpControlBits | 48-51 | RESERVED | | 7 | sourceTransportPort | 52 | minimumTTL | | 8 | sourceIPv4Address | 53 | maximumTTL | | 9 | sourceIPv4PrefixLength | 54 | fragmentIdentification | | 10 | ingressInterface | 55 | postIpClassOfService | | 11 | destinationTransportPort | 56 | sourceMacAddress | | 12 | destinationIPv4Address | 57 |postDestinationMacAddress| | 13 | destinationIPv4PrefixLength| 58 | vlanId | | 14 | egressInterface | 59 | postVlanId | | 15 | ipNextHopIPv4Address | 60 | ipVersion | | 16 | bgpSourceAsNumber | 61 | flowDirection | | 17 | bgpDestinationAsNumber | 62 | ipNextHopIPv6Address | | 18 | bgpNexthopIPv4Address | 63 | bgpNexthopIPv6Address | | 19 | postMCastPacketDeltaCount | 64 | ipv6ExtensionHeaders | | 20 | postMCastOctetDeltaCount | 65-69 | RESERVED | | 21 | flowEndSysUpTime | 70 | mplsTopLabelStackSection| | 22 | flowStartSysUpTime | 71 | mplsLabelStackSection2 | | 23 | postOctetDeltaCount | 72 | mplsLabelStackSection3 | | 24 | postPacketDeltaCount | 73 | mplsLabelStackSection4 | | 25 | minimumIpTotalLength | 74 | mplsLabelStackSection5 | | 26 | maximumIpTotalLength | 75 | mplsLabelStackSection6 | | 27 | sourceIPv6Address | 76 | mplsLabelStackSection7 | | 28 | destinationIPv6Address | 77 | mplsLabelStackSection8 | | 29 | sourceIPv6PrefixLength | 78 | mplsLabelStackSection9 | | 30 | destinationIPv6PrefixLength| 79 | mplsLabelStackSection10 | | 31 | flowLabelIPv6 | 80 | destinationMacAddress | | 32 | icmpTypeCodeIPv4 | 81 | postSourceMacAddress | | 33 | igmpType | 82-84 | RESERVED | | 34 | RESERVED | 85 | octetTotalCount | | 35 | RESERVED | 86 | packetTotalCount | | 36 | flowActiveTimeout | 87 | RESERVED | | 37 | flowIdleTimeout | 88 | fragmentOffset | | 38 | RESERVED | 89 | RESERVED | | 39 | RESERVED | 90 |mplsVpnRouteDistinguisher| | 40 | exportedOctetTotalCount |91-127 | RESERVED | | 41 | exportedMessageTotalCount | | | | 42 |exportedFlowRecordTotalCount| | | +----+----------------------------+-------+-------------------------+ Claise, Trammell Standards Track [Page 14] Internet-Draft IPFIX Information Model January 18, 2012 The following list gives an overview of the Information Element identifiers that are specified in Section 5 and extends the list of Information Element identifiers specified already in [RFC3954]. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 128 | bgpNextAdjacentAsNumber | 169 | destinationIPv6Prefix | | 129 | bgpPrevAdjacentAsNumber | 170 | sourceIPv6Prefix | | 130 | exporterIPv4Address | 171 | postOctetTotalCount | | 131 | exporterIPv6Address | 172 | postPacketTotalCount | | 132 | droppedOctetDeltaCount | 173 | flowKeyIndicator | | 133 | droppedPacketDeltaCount | 174 | postMCastPacketTotalCount | | 134 | droppedOctetTotalCount | 175 | postMCastOctetTotalCount | | 135 | droppedPacketTotalCount | 176 | icmpTypeIPv4 | | 136 | flowEndReason | 177 | icmpCodeIPv4 | | 137 | commonPropertiesId | 178 | icmpTypeIPv6 | | 138 | observationPointId | 179 | icmpCodeIPv6 | | 139 | icmpTypeCodeIPv6 | 180 | udpSourcePort | | 140 | mplsTopLabelIPv6Address | 181 | udpDestinationPort | | 141 | lineCardId | 182 | tcpSourcePort | | 142 | portId | 183 | tcpDestinationPort | | 143 | meteringProcessId | 184 | tcpSequenceNumber | | 144 | exportingProcessId | 185 | tcpAcknowledgementNumber | | 145 | templateId | 186 | tcpWindowSize | | 146 | wlanChannelId | 187 | tcpUrgentPointer | | 147 | wlanSSID | 188 | tcpHeaderLength | | 148 | flowId | 189 | ipHeaderLength | | 149 | observationDomainId | 190 | totalLengthIPv4 | | 150 | flowStartSeconds | 191 | payloadLengthIPv6 | | 151 | flowEndSeconds | 192 | ipTTL | | 152 | flowStartMilliseconds | 193 | nextHeaderIPv6 | | 153 | flowEndMilliseconds | 194 | mplsPayloadLength | | 154 | flowStartMicroseconds | 195 | ipDiffServCodePoint | | 155 | flowEndMicroseconds | 196 | ipPrecedence | | 156 | flowStartNanoseconds | 197 | fragmentFlags | | 157 | flowEndNanoseconds | 198 | octetDeltaSumOfSquares | | 158 | flowStartDeltaMicroseconds| 199 | octetTotalSumOfSquares | | 159 | flowEndDeltaMicroseconds | 200 | mplsTopLabelTTL | | 160 | systemInitTimeMilliseconds| 201 | mplsLabelStackLength | | 161 | flowDurationMilliseconds | 202 | mplsLabelStackDepth | | 162 | flowDurationMicroseconds | 203 | mplsTopLabelExp | | 163 | observedFlowTotalCount | 204 | ipPayloadLength | | 164 | ignoredPacketTotalCount | 205 | udpMessageLength | | 165 | ignoredOctetTotalCount | 206 | isMulticast | | 166 | notSentFlowTotalCount | 207 | ipv4IHL | | 167 | notSentPacketTotalCount | 208 | ipv4Options | | 168 | notSentOctetTotalCount | 209 | tcpOptions | Claise, Trammell Standards Track [Page 15] Internet-Draft IPFIX Information Model January 18, 2012 +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 210 | paddingOctets | 218 | tcpSynTotalCount | | 211 | collectorIPv4Address | 219 | tcpFinTotalCount | | 212 | collectorIPv6Address | 220 | tcpRstTotalCount | | 213 | exportInterface | 221 | tcpPshTotalCount | | 214 | exportProtocolVersion | 222 | tcpAckTotalCount | | 215 | exportTransportProtocol | 223 | tcpUrgTotalCount | | 216 | collectorTransportPort | 224 | ipTotalLength | | 217 | exporterTransportPort | 237 | postMplsTopLabelExp | | | | 238 | tcpWindowScale | +-----+---------------------------+-----+---------------------------+ 5. Information Elements This section describes the Information Element category for the IPFIX information model at the time that RFC5102 [RFC5102] was published. Since this category field is not part of the IANA process for assigning new Information Element (even though it has been reused, for example, in [RFC5103]), the newest Information Elements in IANA [IPFIX-IANA] don't have this classification. The elements are grouped into 12 groups according to their semantics and their applicability: 1. Identifiers 2. Metering and Exporting Process Configuration 3. Metering and Exporting Process Statistics 4. IP Header Fields 5. Transport Header Fields 6. Sub-IP Header Fields 7. Derived Packet Properties 8. Min/Max Flow Properties 9. Flow Timestamps 10. Per-Flow Counters 11. Miscellaneous Flow Properties 12. Padding The Information Elements that are derived from fields of packets or from packet treatment, such as the Information Elements in groups 4-7, can typically serve as Flow Keys used for mapping packets to Flows. If they do not serve as Flow Keys, their value may change from packet to packet within a single Flow. For Information Elements with values that are derived from fields of packets or from packet treatment and for which the value may change from packet to packet within a single Flow, the IPFIX information model defines that their value is Claise, Trammell Standards Track [Page 16] Internet-Draft IPFIX Information Model January 18, 2012 determined by the first packet observed for the corresponding Flow, unless the description of the Information Element explicitly specifies a different semantics. This simple rule allows writing all Claise, Trammell Standards Track [Page 17] Internet-Draft IPFIX Information Model January 18, 2012 Information Elements related to header fields once when the first packet of the Flow is observed. For further observed packets of the same Flow, only Flow properties that depend on more than one packet, such as the Information Elements in groups 8-11, need to be updated. Information Elements with a name having the "post" prefix, for example, "postIpClassOfService", do not report properties that were actually observed at the Observation Point, but retrieved by other means within the Observation Domain. These Information Elements can be used if there are middlebox functions within the Observation Domain changing Flow properties after packets passed the Observation Point. 5.1. Identifiers Information Elements grouped in the table below are identifying components of the IPFIX architecture, of an IPFIX Device, or of the IPFIX protocol. All of them have an integral abstract data type and data type semantics "identifier" as described in Section 3.2.4. Typically, some of them are used for limiting scopes of other Information Elements. However, other Information Elements MAY be used for limiting scopes. Note also that all Information Elements listed below MAY be used for other purposes than limiting scopes. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 141 | lineCardId | 148 | flowId | | 142 | portId | 145 | templateId | | 10 | ingressInterface | 149 | observationDomainId | | 14 | egressInterface | 138 | observationPointId | | 143 | meteringProcessId | 137 | commonPropertiesId | | 144 | exportingProcessId | | | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.2. Metering and Exporting Process Configuration Information Elements in this section describe the configuration of the Metering Process or the Exporting Process. The set of these Information Elements is listed in the table below. +-----+--------------------------+-----+----------------------------+ | ID | Name | ID | Name | Claise, Trammell Standards Track [Page 18] Internet-Draft IPFIX Information Model January 18, 2012 +-----+--------------------------+-----+----------------------------+ | 130 | exporterIPv4Address | 213 | exportInterface | | 131 | exporterIPv6Address | 214 | exportProtocolVersion | | 217 | exporterTransportPort | 215 | exportTransportProtocol | | 211 | collectorIPv4Address | 216 | collectorTransportPort | | 212 | collectorIPv6Address | 173 | flowKeyIndicator | +-----+--------------------------+-----+----------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.3. Metering and Exporting Process Statistics Information Elements in this section describe statistics of the Metering Process and/or the Exporting Process. The set of these Information Elements is listed in the table below. +-----+-----------------------------+-----+-------------------------+ | ID | Name | ID | Name | +-----+-----------------------------+-----+-------------------------+ | 41 | exportedMessageTotalCount | 165 | ignoredOctetTotalCount | | 40 | exportedOctetTotalCount | 166 | notSentFlowTotalCount | | 42 | exportedFlowRecordTotalCount| 167 | notSentPacketTotalCount | | 163 | observedFlowTotalCount | 168 | notSentOctetTotalCount | | 164 | ignoredPacketTotalCount | | | +-----+-----------------------------+-----+-------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.4. IP Header Fields Information Elements in this section indicate values of IP header fields or are derived from IP header field values in combination with further information. +-----+----------------------------+-----+--------------------------+ | ID | Name | ID | Name | +-----+----------------------------+-----+--------------------------+ | 60 | ipVersion | 193 | nextHeaderIPv6 | | 8 | sourceIPv4Address | 195 | ipDiffServCodePoint | | 27 | sourceIPv6Address | 196 | ipPrecedence | | 9 | sourceIPv4PrefixLength | 5 | ipClassOfService | | 29 | sourceIPv6PrefixLength | 55 | postIpClassOfService | | 44 | sourceIPv4Prefix | 31 | flowLabelIPv6 | | 170 | sourceIPv6Prefix | 206 | isMulticast | Claise, Trammell Standards Track [Page 19] Internet-Draft IPFIX Information Model January 18, 2012 | 12 | destinationIPv4Address | 54 | fragmentIdentification | | 28 | destinationIPv6Address | 88 | fragmentOffset | | 13 | destinationIPv4PrefixLength| 197 | fragmentFlags | | 30 | destinationIPv6PrefixLength| 189 | ipHeaderLength | | 45 | destinationIPv4Prefix | 207 | ipv4IHL | | 169 | destinationIPv6Prefix | 190 | totalLengthIPv4 | | 192 | ipTTL | 224 | ipTotalLength | | 4 | protocolIdentifier | 191 | payloadLengthIPv6 | +-----+----------------------------+-----+--------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.5. Transport Header Fields The set of Information Elements related to transport header fields and length includes the Information Elements listed in the table below. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 7 | sourceTransportPort | 238 | tcpWindowScale | | 11 | destinationTransportPort | 187 | tcpUrgentPointer | | 180 | udpSourcePort | 188 | tcpHeaderLength | | 181 | udpDestinationPort | 32 | icmpTypeCodeIPv4 | | 205 | udpMessageLength | 176 | icmpTypeIPv4 | | 182 | tcpSourcePort | 177 | icmpCodeIPv4 | | 183 | tcpDestinationPort | 139 | icmpTypeCodeIPv6 | | 184 | tcpSequenceNumber | 178 | icmpTypeIPv6 | | 185 | tcpAcknowledgementNumber | 179 | icmpCodeIPv6 | | 186 | tcpWindowSize | 33 | igmpType | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. Claise, Trammell Standards Track [Page 20] Internet-Draft IPFIX Information Model January 18, 2012 5.6. Sub-IP Header Fields The set of Information Elements related to Sub-IP header fields includes the Information Elements listed in the table below. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 56 | sourceMacAddress | 201 | mplsLabelStackLength | | 81 | postSourceMacAddress | 194 | mplsPayloadLength | | 58 | vlanId | 70 | mplsTopLabelStackSection | | 59 | postVlanId | 71 | mplsLabelStackSection2 | | 80 | destinationMacAddress | 72 | mplsLabelStackSection3 | | 57 | postDestinationMacAddress | 73 | mplsLabelStackSection4 | | 146 | wlanChannelId | 74 | mplsLabelStackSection5 | | 147 | wlanSSID | 75 | mplsLabelStackSection6 | | 200 | mplsTopLabelTTL | 76 | mplsLabelStackSection7 | | 203 | mplsTopLabelExp | 77 | mplsLabelStackSection8 | | 237 | postMplsTopLabelExp | 78 | mplsLabelStackSection9 | | 202 | mplsLabelStackDepth | 79 | mplsLabelStackSection10 | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.7. Derived Packet Properties The set of Information Elements derived from packet properties (for example, values of header fields) includes the Information Elements listed in the table below. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 204 | ipPayloadLength | 18 | bgpNextHopIPv4Address | | 15 | ipNextHopIPv4Address | 63 | bgpNextHopIPv6Address | | 62 | ipNextHopIPv6Address | 46 | mplsTopLabelType | | 16 | bgpSourceAsNumber | 47 | mplsTopLabelIPv4Address | | 17 | bgpDestinationAsNumber | 140 | mplsTopLabelIPv6Address | | 128 | bgpNextAdjacentAsNumber | 90 | mplsVpnRouteDistinguisher | | 129 | bgpPrevAdjacentAsNumber | | | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.9. Flow Timestamps Claise, Trammell Standards Track [Page 21] Internet-Draft IPFIX Information Model January 18, 2012 Information Elements in this section are timestamps of events. Timestamps flowStartSeconds, flowEndSeconds, flowStartMilliseconds, flowEndMilliseconds, flowStartMicroseconds, flowEndMicroseconds, flowStartNanoseconds, flowEndNanoseconds, and systemInitTimeMilliseconds are absolute and have a well-defined fixed time base, such as, for example, the number of seconds since 0000 UTC Jan 1st 1970. Timestamps flowStartDeltaMicroseconds and flowEndDeltaMicroseconds are relative timestamps only valid within the scope of a single IPFIX Message. They contain the negative time offsets relative to the export time specified in the IPFIX Message Header. The maximum time offset that can be encoded by these delta counters is 1 hour, 11 minutes, and 34.967295 seconds. Timestamps flowStartSysUpTime and flowEndSysUpTime are relative timestamps indicating the time relative to the last (re-)initialization of the IPFIX Device. For reporting the time of the last (re-)initialization, systemInitTimeMilliseconds can be reported, for example, in Data Records defined by Option Templates. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 150 | flowStartSeconds | 156 | flowStartNanoseconds | | 151 | flowEndSeconds | 157 | flowEndNanoseconds | | 152 | flowStartMilliseconds | 158 | flowStartDeltaMicroseconds| | 153 | flowEndMilliseconds | 159 | flowEndDeltaMicroseconds | | 154 | flowStartMicroseconds | 160 | systemInitTimeMilliseconds| | 155 | flowEndMicroseconds | 22 | flowStartSysUpTime | | | | 21 | flowEndSysUpTime | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.10. Per-Flow Counters Information Elements in this section are counters all having integer values. Their values may change for every report they are used in. They cannot serve as part of a Flow Key used for mapping packets to Flows. However, potentially they can be used for selecting exported Flows, for example, by only exporting Flows with more than a threshold number of observed octets. There are running counters and delta counters. Delta counters are reset to zero each time their values are exported. Running counters Claise, Trammell Standards Track [Page 22] Internet-Draft IPFIX Information Model January 18, 2012 continue counting independently of the Exporting Process. There are per-Flow counters and counters related to the Metering Process and/or the Exporting Process. Per-Flow counters are Flow properties that potentially change each time a packet belonging to the Flow is observed. The set of per-Flow counters includes the Information Elements listed in the table below. Counters related to the Metering Process and/or the Exporting Process are described in Section 5.3. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 1 | octetDeltaCount | 134 | droppedOctetTotalCount | | 23 | postOctetDeltaCount | 135 | droppedPacketTotalCount | | 198 | octetDeltaSumOfSquares | 19 | postMCastPacketDeltaCount | | 85 | octetTotalCount | 20 | postMCastOctetDeltaCount | | 171 | postOctetTotalCount | 174 | postMCastPacketTotalCount | | 199 | octetTotalSumOfSquares | 175 | postMCastOctetTotalCount | | 2 | packetDeltaCount | 218 | tcpSynTotalCount | | 24 | postPacketDeltaCount | 219 | tcpFinTotalCount | | 86 | packetTotalCount | 220 | tcpRstTotalCount | | 172 | postPacketTotalCount | 221 | tcpPshTotalCount | | 132 | droppedOctetDeltaCount | 222 | tcpAckTotalCount | | 133 | droppedPacketDeltaCount | 223 | tcpUrgTotalCount | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 5.11. Miscellaneous Flow Properties Information Elements in this section describe properties of Flows that are related to Flow start, Flow duration, and Flow termination, but they are not timestamps as the Information Elements in Section 5.9 are. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 36 | flowActiveTimeout | 161 | flowDurationMilliseconds | | 37 | flowIdleTimeout | 162 | flowDurationMicroseconds | | 136 | flowEndReason | 61 | flowDirection | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. Claise, Trammell Standards Track [Page 23] Internet-Draft IPFIX Information Model January 18, 2012 5.12. Padding This section contains a single Information Element that can be used for padding of Flow Records. IPFIX implementations may wish to align Information Elements within Data Records or to align entire Data Records to 4-octet or 8-octet boundaries. This can be achieved by including one or more paddingOctets Information Elements in a Data Record. +-----+---------------------------+-----+---------------------------+ | ID | Name | ID | Name | +-----+---------------------------+-----+---------------------------+ | 210 | paddingOctets | | | +-----+---------------------------+-----+---------------------------+ See [IPFIX-IANA] for the definitions of these Information Elements. 6. Extending the Information Model A key requirement for IPFIX is to allow for extension of the Information Model maintained by IANA. The process for extending the Information Model is defined in [IPFIX-IE-DOCTORS], which also provides guidelines for authors and reviewers of new Information Element definitions. For new Information Elements, the type space defined in Section 3 can be used. If required, new abstract data types can be added to the subregistry defined in [RFC5610]. New abstract data types MUST be defined in IETF Standards Track documents. Enterprises may wish to define Information Elements without registering them with IANA. IPFIX explicitly supports enterprise-specific Information Elements. Enterprise-specific Information Elements are described in Sections 2.1 and 4; guidelines for using them appear in [IPFIX-IE-DOCTORS]. 7. IANA Considerations 7.1. IPFIX Information Elements This document refers to the Information Elements, for which the Internet Assigned Numbers Authority (IANA) has created a registry for IPFIX Information Element identifiers [IPFIX-IANA]. New assignments for IPFIX Information Elements will be administered Claise, Trammell Standards Track [Page 24] Internet-Draft IPFIX Information Model January 18, 2012 by IANA through Expert Review [RFC5226], i.e., review by one of a group of experts designated by an IETF Area Director. The group of experts MUST check the requested Information Element for completeness and accuracy of the description and for correct naming according to the naming conventions in Section 2.3. Requests for Information Elements that duplicate the functionality of existing Information Elements SHOULD be declined. The smallest available identifier SHOULD be assigned to a new Information Element. The specification of new IPFIX Information Elements MUST use the template specified in Section 2.1 and MUST be published using a well-established and persistent publication medium. The experts will initially be drawn from the Working Group Chairs and document editors of the IPFIX and PSAMP Working Groups. 7.2. MPLS Label Type Identifier Information Element #46, named mplsTopLabelType, carries MPLS label types. Values for 5 different types have initially been defined. For ensuring extensibility of this information, IANA has created a new registry for MPLS label types and filled it with the initial list from the description Information Element #46, mplsTopLabelType. New assignments for MPLS label types will be administered by IANA through Expert Review [RFC5226], i.e., review by one of a group of experts designated by an IETF Area Director. The group of experts must double check the label type definitions with already defined label types for completeness, accuracy, and redundancy. The specification of new MPLS label types MUST be published using a well-established and persistent publication medium. 7.3. XML Namespace and Schema [IPFIX-XML-SCHEMA] defines an XML schema for IPFIX Information Element definitions. All Information Elements specified in [IPFIX-IANA] are defined by this schema. This schema may also be used for specifying further Information Elements in future extensions of the IPFIX information model in a machine-readable way. [IPFIX-XML-SCHEMA] uses URNs to describe an XML namespace and an XML schema for IPFIX Information Elements conforming to a registry mechanism described in [RFC3688]. Two URI assignments have been made. 1. Registration for the IPFIX information model namespace * URI: urn:ietf:params:xml:ns:ipfix-info * Registrant Contact: IETF IPFIX Working Group , as designated by the IESG . Claise, Trammell Standards Track [Page 25] Internet-Draft IPFIX Information Model January 18, 2012 * XML: None. Namespace URIs do not represent an XML. 2. Registration for the IPFIX information model schema * URI: urn:ietf:params:xml:schema:ipfix-info * Registrant Contact: IETF IPFIX Working Group , as designated by the IESG . Using a machine-readable syntax for the information model enables the creation of IPFIX-aware tools that can automatically adapt to extensions to the information model, by simply reading updated information model specifications. The wide availability of XML-aware tools and libraries for client devices is a primary consideration for this choice. In particular, libraries for parsing XML documents are readily available. Also, mechanisms such as the Extensible Stylesheet Language (XSL) allow for transforming a source XML document into other documents. This document was authored in XML and transformed according to [RFC2629]. It should be noted that the use of XML in Exporters, Collectors, or other tools is not mandatory for the deployment of IPFIX. In particular, Exporting Processes do not produce or consume XML as part of their operation. It is expected that IPFIX Collectors MAY take advantage of the machine readability of the information model vs. hard coding their behavior or inventing proprietary means for accommodating extensions. 8. Security Considerations The IPFIX information model itself does not directly introduce security issues. Rather, it defines a set of attributes that may for privacy or business issues be considered sensitive information. For example, exporting values of header fields may make attacks possible for the receiver of this information, which would otherwise only be possible for direct observers of the reported Flows along the data path. The underlying protocol used to exchange the information described here must therefore apply appropriate procedures to guarantee the integrity and confidentiality of the exported information. Such protocols are defined in separate documents, specifically the IPFIX protocol document [RFC5101bis]. This document does not specify any Information Element carrying keying material. If future extensions will do so, then appropriate precautions need to be taken for properly protecting such sensitive information. Claise, Trammell Standards Track [Page 26] Internet-Draft IPFIX Information Model January 18, 2012 9. Acknowledgements The editors would like to thanks the authors of the RFC5102 [RFC5102], as this document is based upon and develop this original RFC: Juergen Quittek, Stewart Bryant, Paul Aitken, and Jeff Meyer. 10. References 10.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5905] Mills, D., Delaware, U., Martin, J., Burbank, J. and W. Kasch, "Network Time Protocol Version 4: Protocol and Algorithms Specification", RFC 5905, June 2010 [RFC5101bis] Claise, B., and B. Trammell, Editors, "Specification of the IP Flow Information eXport (IPFIX) Protocol for the Exchange of IP Traffic Flow Information", draft-ietf- ipfix-protocol-rfc5101bis-01, Work in Progress, March 2012. [IPFIX-IE-DOCTORS] Trammell, T., and B. Claise, "Guidelines for Authors and Reviewers of IPFIX Information Elements", draft-ietf-ipfix-ie-doctors-02, Work in Progress, March 2012. 10.2. Informative References [IEEE.754.1985] Institute of Electrical and Electronics Engineers, "Standard for Binary Floating-Point Arithmetic", IEEE Standard 754, August 1985. [ISO.10646-1.1993] International Organization for Standardization, "Information Technology - Universal Multiple-octet coded Character Set (UCS) - Part 1: Architecture and Basic Multilingual Plane", ISO Standard 10646-1, May 1993. [ISO.646.1991] International Organization for Standardization, "Information technology - ISO 7-bit coded character set for information interchange", ISO Standard 646, 1991. [RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder, Claise, Trammell Standards Track [Page 27] Internet-Draft IPFIX Information Model January 18, 2012 "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, June 1999. [RFC3234] Carpenter, B. and S. Brim, "Middleboxes: Taxonomy and Issues", RFC 3234, February 2002. [RFC3444] Pras, A. and J. Schoenwaelder, "On the Difference between Information Models and Data Models", RFC 3444, January 2003. [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, January 2004. [RFC3917] Quittek, J., Zseby, T., Claise, B., and S. Zander, "Requirements for IP Flow Information Export (IPFIX)", RFC 3917, October 2004. [RFC3954] Claise, B., Ed., "Cisco Systems NetFlow Services Export Version 9", RFC 3954, October 2004. [RFC5102] Trammell, B., and E. Boschi, "Bidirectional Flow Export Using IP Flow Information Export (IPFIX)", RFC 5103, January 2008. [RFC5103] Quittek, J., Bryant, S. Claise, B., Aitken, P., and J. Meyer, "Information Model for IP Flow Information Export", RFC 5102, January 2008. [RFC5153] Boschi, E., Mark, L., Quittek J., and P. Aitken, "IP Flow Information Export (IPFIX) Implementation Guidelines", RFC5153, April 2008. [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008. [RFC5470] Sadasivan, G., Brownlee, N., Claise, B., and J. Quittek, "Architecture for IP Flow Information Export", RFC5470, March 2009. [RFC5471] Schmoll, C., Aitken, P., and B. Claise, "Guidelines for IP Flow Information Export (IPFIX) Testing", RFC5471, March 2009. [RFC5472] Zseby, T., Boschi, E., Brownlee, N., and B. Claise, "IP Claise, Trammell Standards Track [Page 28] Internet-Draft IPFIX Information Model January 18, 2012 Flow Information Export (IPFIX) Applicability", RFC5472, March 2009. [RFC5473] Boschi, E., Mark, L., and B. Claise, "Reducing Redundancy in IP Flow Information Export (IPFIX) and Packet Sampling (PSAMP) Reports", RFC5473, March 2009. [RFC5610] Boschi, E., Trammell, B., Mark, L., and T. Zseby, "Exporting Type Information for IP Flow Information Export (IPFIX) Information Elements", July 2009. [RFC6313] Claise, B., Dhandapani, G., Aitken, P, and S. Yates, "Export of Structured Data in IP Flow Information Export (IPFIX)", RFC6313, July 2011. [RFC6183] Kobayashi, A., Claise, B., Muenz, G, and K. Ishibashi, "IP Flow Information Export (IPFIX) Mediation: Framework", RFC6183, April 2011. [IPFIX-CONF] Muenz, G., Claise, B., and P. Aitken, "Configuration Data Model for IPFIX and PSAMP", draft-ietf-ipfix- configuration-model-10, Work in Progress, July 2011. [IPFIX-MED-PROTO] Claise, B., Kobayashi, A., and B. Trammell, "Specification of the Protocol for IPFIX Mediations", draft-ietf-ipfix-mediation-protocol-00, Work in Progress, December 2011. [RFC5815bis] Dietz, T., Kobayashi, A., Claise, B., and G. Muenz, "Definitions of Managed Objects for IP Flow Information Export", draft-ietf-ipfix-rfc5815bis-01.txt, Work in Progress, January 2012. [IPFIX-IANA] http://www.iana.org/assignments/ipfix/ipfix.xml [IPFIX-XML-SCHEMA] http://www.iana.org/assignments/xml- registry/schema/ipfix.xsd Claise, Trammell Standards Track [Page 29] Internet-Draft IPFIX Information Model January 18, 2012 Authors' Addresses Benoit Claise Cisco Systems, Inc. De Kleetlaan 6a b1 Diegem 1831 Belgium Phone: +32 2 704 5622 EMail: bclaise@cisco.com Brian Trammell Swiss Federal Institute of Technology Zurich Gloriastrasse 35 8092 Zurich Switzerland Phone: +41 44 632 70 13 EMail: trammell@tik.ee.ethz.ch Claise, Trammell Standards Track [Page 30]