Diffserv-Interconnection Classes and Practice
RFC 8100

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Internet Engineering Task Force (IETF)                      R. Geib, Ed.
Request for Comments: 8100                              Deutsche Telekom
Category: Informational                                         D. Black
ISSN: 2070-1721                                                 Dell EMC
                                                              March 2017

             Diffserv-Interconnection Classes and Practice

Abstract

   This document defines a limited common set of Diffserv Per-Hop
   Behaviors (PHBs) and Diffserv Codepoints (DSCPs) to be applied at
   (inter)connections of two separately administered and operated
   networks, and it explains how this approach can simplify network
   configuration and operation.  Many network providers operate
   Multiprotocol Label Switching (MPLS) using Treatment Aggregates for
   traffic marked with different Diffserv Per-Hop Behaviors 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
   and apply the Short Pipe Model.  While motivated by the requirements
   of MPLS network operators that use Short Pipe Model tunnels, this
   document is applicable to other networks, both MPLS and non-MPLS.

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 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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 7841.

   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/rfc8100.

Geib & Black                  Informational                     [Page 1]
RFC 8100                    Diffserv-Intercon                 March 2017

Copyright 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
   (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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Related Work  . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Applicability Statement . . . . . . . . . . . . . . . . .   5
     1.3.  Document Organization . . . . . . . . . . . . . . . . . .   5
   2.  MPLS and Short Pipe Model Tunnels . . . . . . . . . . . . . .   6
   3.  Relationship to RFC 5127  . . . . . . . . . . . . . . . . . .   7
     3.1.  Background of RFC 5127  . . . . . . . . . . . . . . . . .   7
     3.2.  Differences from RFC 5127 . . . . . . . . . . . . . . . .   7
   4.  The Diffserv-Intercon Interconnection Classes . . . . . . . .   8
     4.1.  Diffserv-Intercon Example . . . . . . . . . . . . . . . .  11
     4.2.  End-to-End PHB and DSCP Transparency  . . . . . . . . . .  13
     4.3.  Treatment of Network Control Traffic at Carrier
           Interconnection Interfaces  . . . . . . . . . . . . . . .  13
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  The MPLS Short Pipe Model and IP Traffic . . . . . .  18
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  21
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

Geib & Black                  Informational                     [Page 2]
RFC 8100                    Diffserv-Intercon                 March 2017

1.  Introduction

   Diffserv has been deployed in many networks; it provides
   differentiated traffic forwarding based on the Diffserv Codepoint
   (DSCP) field, which is part of the IP header [RFC2474].  This
   document defines a set of common Diffserv classes (Per-Hop Behaviors
   (PHBs)) and codepoints for use at interconnection points to which and
   from which locally used classes and codepoints should be mapped.