Current Open Questions in Path Aware Networking
draft-irtf-panrg-questions-08

Document Type Active Internet-Draft (panrg RG)
Author Brian Trammell 
Last updated 2021-02-08 (latest revision 2020-12-23)
Replaces draft-trammell-panrg-questions
Stream Internet Research Task Force (IRTF)
Intended RFC status Informational
Formats plain text html xml pdf htmlized (tools) htmlized bibtex
Stream IRTF state Waiting for Document Shepherd
Revised I-D Needed
Consensus Boilerplate Yes
Document shepherd Spencer Dawkins
Shepherd write-up Show (last changed 2020-09-01)
IESG IESG state I-D Exists::Revised I-D Needed
Telechat date
Responsible AD (None)
Send notices to Spencer Dawkins <spencerdawkins.ietf@gmail.com>
Path Aware Networking RG                                     B. Trammell
Internet-Draft                                   Google Switzerland GmbH
Intended status: Informational                          23 December 2020
Expires: 26 June 2021

            Current Open Questions in Path Aware Networking
                     draft-irtf-panrg-questions-08

Abstract

   In contrast to the present Internet architecture, a path-aware
   internetworking architecture has two important properties: it exposes
   the properties of available Internet paths to endpoints, and provides
   for endpoints and applications to use these properties to select
   paths through the Internet for their traffic.  While this property of
   "path awareness" already exists in many Internet-connected networks
   within single domains and via administrative interfaces to the
   network layer, a fully path-aware internetwork expands these concepts
   across layers and across the Internet.

   This document poses questions in path-aware networking open as of
   2021, that must be answered in the design, development, and
   deployment of path-aware internetworks.  It was originally written to
   frame discussions in the Path Aware Networking proposed Research
   Group (PANRG), and has been published to snapshot current thinking in
   this space.

Discussion Venues

   This note is to be removed before publishing as an RFC.

   Source for this draft and an issue tracker can be found at
   https://github.com/panrg/questions.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

Trammell                  Expires 26 June 2021                  [Page 1]
Internet-Draft                PAN questions                December 2020

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 26 June 2021.

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 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 to Path-Aware Networking . . . . . . . . . . . .   2
     1.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Questions . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  A Vocabulary of Path Properties . . . . . . . . . . . . .   4
     2.2.  Discovery, Distribution, and Trustworthiness of Path
           Properties  . . . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Supporting Path Selection . . . . . . . . . . . . . . . .   5
     2.4.  Interfaces for Path Awareness . . . . . . . . . . . . . .   6
     2.5.  Implications of Path Awareness for the Transport and
           Application Layers  . . . . . . . . . . . . . . . . . . .   6
     2.6.  What is an Endpoint?  . . . . . . . . . . . . . . . . . .   7
     2.7.  Operating a Path Aware Network  . . . . . . . . . . . . .   7
     2.8.  Deploying a Path Aware Network  . . . . . . . . . . . . .   8
   3.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Informative References  . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction to Path-Aware Networking

   In the current Internet architecture, the network layer provides an
   unverifiable, best-effort service to the endpoints using it.  While
   there are technologies that attempt better-than-best-effort delivery,
   the interfaces to these are generally administrative as opposed to
   endpoint-exposed (e.g.  PCE [RFC4655] and SD-WAN approaches), and
   they are often restricted to single administrative domains.  In this

Trammell                  Expires 26 June 2021                  [Page 2]
Internet-Draft                PAN questions                December 2020

   environment, an application can assume that a packet with a given
   destination address will eventually be forwarded toward that
Show full document text