A Vocabulary of Path Properties
draft-irtf-panrg-path-properties-00

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Replaces draft-enghardt-panrg-path-properties
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PANRG                                                        T. Enghardt
Internet-Draft                                                 TU Berlin
Intended status: Informational                           C. Kraehenbuehl
Expires: September 8, 2020                                   ETH Zuerich
                                                          March 07, 2020

                    A Vocabulary of Path Properties
                  draft-irtf-panrg-path-properties-00

Abstract

   Path properties express information about paths across a network and
   the services provided via such paths.  In a path-aware network, path
   properties may be fully or partially available to entities such as
   hosts.  This document defines and categorizes path properties.
   Furthermore, the document specifies several path properties which
   might be useful to hosts or other entities, e.g., for selecting
   between paths or for invoking some of the provided services.

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 8, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://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
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Use Cases for Path Properties . . . . . . . . . . . . . . . .   5
     3.1.  Path Selection  . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Protocol Selection  . . . . . . . . . . . . . . . . . . .   6
     3.3.  Service Invocation  . . . . . . . . . . . . . . . . . . .   6
   4.  Examples of Path Properties . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  10
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   In the current Internet architecture, hosts generally do not have
   information about forwarding paths through the network and about
   services associated with these paths.  A path-aware network, as
   introduced in [I-D.irtf-panrg-questions], exposes information about
   paths to hosts or to other entities.  This document defines such
   information as path properties, addressing the first of the questions
   in path-aware networking [I-D.irtf-panrg-questions].

   As terms related to paths have different meanings in different areas
   of networking, first, this document provides a common terminology to
   define paths, path elements, and path properties.  Then, this
   document provides some examples for use cases for path properties.
   Finally, the document lists several path properties that may be
   useful for the mentioned use cases.

   Note that this document does not assume that any of the listed path
   properties are actually available to any entity.  The question of how
   entities can discover and distribute path properties in a trustworthy
   way is out of scope for this document.

2.  Terminology

   Node:  An entity which processes packets, e.g., sends, receives,
      forwards, or modifies them.  A node may be physical or virtual,
      e.g., a physical device or a service function provided as a
      virtual element.  A node may also be the collection of multiple

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