Ericsson Two-Way Active Measurement Protocol (TWAMP) Value-Added Octets
RFC 6802

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Internet Engineering Task Force (IETF)                    S. Baillargeon
Request for Comments: 6802                                     C. Flinta
Category: Informational                                      A. Johnsson
ISSN: 2070-1721                                                 Ericsson
                                                           November 2012

Ericsson Two-Way Active Measurement Protocol (TWAMP) Value-Added Octets

Abstract

   This memo describes an extension to the Two-Way Active Measurement
   Protocol (TWAMP).  Specifically, it extends the TWAMP-Test protocol,
   which identifies and manages packet trains, in order to measure
   capacity metrics like the available path capacity, tight section
   capacity, and UDP delivery rate in the forward and reverse path
   directions.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It has been approved for publication by the Internet
   Engineering Steering Group (IESG).  Not all documents approved by the
   IESG are a candidate for any level of Internet Standard; see 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/rfc6802.

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
   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.

Baillargeon, et al.           Informational                     [Page 1]
RFC 6802            Ericsson TWAMP Value-Added Octets      November 2012

Table of Contents

   1. Introduction ....................................................2
      1.1. Requirements Language ......................................3
   2. Purpose and Scope ...............................................3
   3. Capacity Measurement Principles .................................4
   4. TWAMP-Control Extensions ........................................5
      4.1. Additional Considerations ..................................6
   5. Extended TWAMP-Test .............................................6
      5.1. Sender Behavior ............................................6
           5.1.1. Packet Timings ......................................7
           5.1.2. Session-Sender Packet Format ........................7
      5.2. Reflector Behavior ........................................12
           5.2.1. Session-Reflector Packet Format ....................13
      5.3. Additional Considerations .................................13
   6. Experiments ....................................................14
   7. Security Considerations ........................................14
   8. Acknowledgements ...............................................14
   9. References .....................................................15
      9.1. Normative References ......................................15
      9.2. Informative References ....................................15

1.  Introduction

   The notion of embedding a number of meaningful fields in the padding
   octets has been established as a viable methodology for carrying
   additional information within the TWAMP-Test protocol running between
   a Session-Sender and a Session-Reflector [RFC5357] [RFC6038].

   This memo describes an optional extension to the Two-Way Active
   Measurement Protocol (TWAMP) [RFC5357].  It is called the Ericsson
   TWAMP Value-Added Octets feature.  This memo defines version 1.

   This feature enables the controller host to measure capacity metrics
   like the IP-type-P available path capacity (APC) [RFC5136], IP-layer
   tight section capacity (TSC) [Y1540], and UDP delivery rate on both
   forward and reverse paths using a single TWAMP test session.  The
   actual method to calculate the APC, TSC, or the UDP delivery rate
   from packet-level performance data is not discussed in this memo.

   The Valued-Added Octets feature consists of new behaviors for the
   Session-Sender and Session-Reflector and a set of value-added octets
   of information that are placed at the beginning of the Packet Padding
   [RFC5357] or immediately after the Server Octets in the Packet
   Padding (to be reflected) [RFC6038] by the Session-Sender and are
   reflected or returned by the Session-Reflector.  The length of the