DiffServ interconnection classes and practice
draft-ietf-tsvwg-diffserv-intercon-01

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Document Type Active Internet-Draft (tsvwg WG)
Last updated 2015-03-09
Replaces draft-geib-tsvwg-diffserv-intercon
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TSVWG                                                       R. Geib, Ed.
Internet-Draft                                          Deutsche Telekom
Intended status: Informational                                  D. Black
Expires: September 10, 2015                              EMC Corporation
                                                           March 9, 2015

             DiffServ interconnection classes and practice
                 draft-ietf-tsvwg-diffserv-intercon-01

Abstract

   This document proposes a limited set of DiffServ PHBs and codepoints
   to be applied at (inter)connections of two separately administered
   and operated networks.  Many network providers operate MPLS using
   Treatment Aggregates for traffic marked with different DiffServ PHBs,
   and use MPLS for interconnection with other networks.  This document
   offers a simple interconnection approach that may simplify operation
   of DiffServ for network interconnection among providers that use
   MPLS.

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
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   This Internet-Draft will expire on September 10, 2015.

Copyright Notice

   Copyright (c) 2015 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

Geib & Black           Expires September 10, 2015               [Page 1]

Internet-Draft              Diffserv Intercon                 March 2015

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Related work  . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Applicability Statement . . . . . . . . . . . . . . . . .   4
     1.3.  Document Organization . . . . . . . . . . . . . . . . . .   4
   2.  MPLS and the Short Pipe tunnel model  . . . . . . . . . . . .   4
   3.  Relationship to RFC 5127  . . . . . . . . . . . . . . . . . .   5
     3.1.  RFC 5127 Background . . . . . . . . . . . . . . . . . . .   6
     3.2.  Differences from RFC 5127 . . . . . . . . . . . . . . . .   6
   4.  The DiffServ-Intercon Interconnection Classes . . . . . . . .   7
     4.1.  End-to-end QoS: PHB and DS CodePoint Transparency . . . .  12
     4.2.  Treatment of Network Control traffic at carrier
           interconnection interfaces  . . . . . . . . . . . . . . .  13
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Appendix A Carrier interconnection related DiffServ
                aspects  . . . . . . . . . . . . . . . . . . . . . .  16
   Appendix B.  Appendix B The MPLS Short Pipe Model and IP traffic   18
   Appendix C.  Change log . . . . . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

1.  Introduction

   DiffServ has been deployed in many networks.  As described by section
   2.3.4.2 of RFC 2475, remarking of packets at domain boundaries is a
   DiffServ feature [RFC2475].  This draft proposes a set of standard
   QoS classes and code points at interconnection points to which and
   from which locally used classes and code points should be mapped.

   RFC2474 specifies the DiffServ Codepoint Field [RFC2474].
   Differentiated treatment is based on the specific DSCP.  Once set, it
   may change.  If traffic marked with unknown or unexpected DSCPs is
   received, RFC2474 recommends forwarding that traffic with default
   (best effort) treatment without changing the DSCP markings.  Many
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