Two-Way Active Measurement Protocol (TWAMP) Reflect Octets and Symmetrical Size Features
RFC 6038

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Internet Engineering Task Force (IETF)                         A. Morton
Request for Comments: 6038                                 L. Ciavattone
Updates: 5357                                                  AT&T Labs
Category: Standards Track                                   October 2010
ISSN: 2070-1721

     Two-Way Active Measurement Protocol (TWAMP) Reflect Octets and
                       Symmetrical Size Features

Abstract

   This memo describes two closely related features for the core
   specification of the Two-Way Active Measurement Protocol (TWAMP): an
   optional capability where the responding host returns some of the
   command octets or padding octets to the sender, and an optional
   sender packet format that ensures equal test packet sizes are used in
   both directions.

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 5741.

   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/rfc6038.

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   document authors.  All rights reserved.

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Morton & Ciavattone          Standards Track                    [Page 1]
RFC 6038             Reflect Octets & Symmetric Size        October 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
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   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Language ...........................................3
   3. Purpose and Scope ...............................................4
   4. TWAMP Control Extensions ........................................4
      4.1. Connection Setup with New Features .........................5
      4.2. Reflect Octets: Request-TW-Session Packet Format ...........6
      4.3. Reflect Octets: Accept Session Packet Format ...............7
      4.4. Additional Considerations ..................................9
   5. Extended TWAMP Test .............................................9
      5.1. Sender Behavior ............................................9
           5.1.1. Packet Timings ......................................9
           5.1.2. Reflect Octets: Packet Formats and Contents .........9
           5.1.3. Reflect Octets: Interaction with Padding
                  Truncation .........................................11
           5.1.4. Symmetrical Size: Session-Sender Packet Format .....13
           5.1.5. Symmetrical Size AND Reflect Octets:
                  Session-Sender Packet ..............................14
      5.2. Reflector Behavior ........................................14
           5.2.1. Reflect Octets: Session-Reflector Packet
                  Format and Contents ................................15
           5.2.2. Symmetrical Size: Session-Reflector Packet Format ..16
           5.2.3. Symmetrical Size AND Reflect Octets:
                  Session-Sender Packet Format .......................16
   6. Security Considerations ........................................17
   7. IANA Considerations ............................................17
      7.1. Registry Specification ....................................17
      7.2. Registry Contents .........................................17
   8. Acknowledgements ...............................................17
   9. Normative References ...........................................18