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

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.

Copyright Notice

   Copyright (c) 2010 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.

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
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   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

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