IP Flow Information Export (IPFIX) Information Elements Extension for Flow Variance Information
draft-zhou-ipfix-variance-00

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INTERNET-DRAFT                                                   C. Zhou
Intended Status: Informational                                  H. Zheng
Expires: September 14, 2017                                       Huawei
                                                          March 13, 2017

   IP Flow Information Export (IPFIX) Information Elements Extension
                     for Flow Variance Information
                      draft-zhou-ipfix-variance-00

Abstract

   This document proposes several new Information Elements for the IP
   Flow Information Export (IPFIX) protocol, which are used to export
   variance information about the flow, regarding the sizes of the
   packets sampled. This kind of information is helpful to form a
   statistical view of the flow.  

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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Copyright and License 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
 

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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  3
   2  Information Elements  . . . . . . . . . . . . . . . . . . . . .  3
   3  Security Considerations . . . . . . . . . . . . . . . . . . . .  4
   4  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  4
   5  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     5.1  Normative References  . . . . . . . . . . . . . . . . . . .  4
     5.2  Informative References  . . . . . . . . . . . . . . . . . .  4
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . .  5

 

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1  Introduction

   The current set of IP Flow Information Export (IPFIX) Information
   Elements [IANA-IPFIX] is extensive.  However, it contains no means to
   export information about the average size of packets in a flow, as
   well as the variance of the pack sizes.  Having those information not
   only helps gain more insight of the flow from a statistical view, but
   also facilitates the detection of any anomaly traffic.

   Below are the new Information Elements being introduced:

      o  ipTotalLengthSampleMean
      o  ipTotalLengthSampleVariance

   The definitions of the Information Elements are given in Section 2.
   Another reason to add these Information Elements is that it may not
   be practical to export every sampled packet's size and then calculate
   the mean and variance offline.  For the sake of saving the data size
   to export, it is better to calculate mean and variance at the
   Observation Point and export only the calculated values.  Algorithms
   such as [RunningVariance] exist to calculate mean and variance
   online, in a single pass, without having to save sizes of the sampled
   packets.

1.1  Terminology

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