Problem Statement and Architecture for Information Exchange between Interconnected Traffic-Engineered Networks
RFC 7926

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Internet Engineering Task Force (IETF)                    A. Farrel, Ed.
Request for Comments: 7926                                      J. Drake
BCP: 206                                                Juniper Networks
Category: Best Current Practice                                 N. Bitar
ISSN: 2070-1721                                                    Nokia
                                                              G. Swallow
                                                     Cisco Systems, Inc.
                                                           D. Ceccarelli
                                                                Ericsson
                                                                X. Zhang
                                                                  Huawei
                                                               July 2016

      Problem Statement and Architecture for Information Exchange
           between Interconnected Traffic-Engineered Networks

Abstract

   In Traffic-Engineered (TE) systems, it is sometimes desirable to
   establish an end-to-end TE path with a set of constraints (such as
   bandwidth) across one or more networks from a source to a
   destination.  TE information is the data relating to nodes and TE
   links that is used in the process of selecting a TE path.  TE
   information is usually only available within a network.  We call such
   a zone of visibility of TE information a domain.  An example of a
   domain may be an IGP area or an Autonomous System.

   In order to determine the potential to establish a TE path through a
   series of connected networks, it is necessary to have available a
   certain amount of TE information about each network.  This need not
   be the full set of TE information available within each network but
   does need to express the potential of providing TE connectivity.
   This subset of TE information is called TE reachability information.

   This document sets out the problem statement for the exchange of TE
   information between interconnected TE networks in support of end-to-
   end TE path establishment and describes the best current practice
   architecture to meet this problem statement.  For reasons that are
   explained in this document, this work is limited to simple TE
   constraints and information that determine TE reachability.

Farrel, et al.            Best Current Practice                 [Page 1]
RFC 7926        Information Exchange between TE Networks       July 2016

Status of This Memo

   This memo documents an Internet Best Current Practice.

   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
   BCPs is available in 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/rfc7926.

Copyright Notice

   Copyright (c) 2016 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.

Farrel, et al.            Best Current Practice                 [Page 2]
RFC 7926        Information Exchange between TE Networks       July 2016

Table of Contents

   1. Introduction ....................................................5
      1.1. Terminology ................................................6
           1.1.1. TE Paths and TE Connections .........................6
           1.1.2. TE Metrics and TE Attributes ........................6
           1.1.3. TE Reachability .....................................7
           1.1.4. Domain ..............................................7
           1.1.5. Server Network ......................................7
           1.1.6. Client Network ......................................7
           1.1.7. Aggregation .........................................7
           1.1.8. Abstraction .........................................8
           1.1.9. Abstract Link .......................................8
           1.1.10. Abstract Node or Virtual Node ......................8
           1.1.11. Abstraction Layer Network ..........................9
   2. Overview of Use Cases ...........................................9