Forwarding Layer Problem Statement
draft-bryant-arch-fwd-layer-ps-00

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INTAREA Working Group                                          S. Bryant
Internet-Draft                                               U. Chunduri
Intended status: Informational                                 T. Eckert
Expires: September 10, 2020                                     A. Clemm
                                             Futurewei Technologies Inc.
                                                          March 09, 2020

                   Forwarding Layer Problem Statement
                   draft-bryant-arch-fwd-layer-ps-00

Abstract

   This document considers the new use cases for IP together with the
   network capabilities and services that will be needed to address
   those use cases.  It then looks at the underlying packet requirements
   and considers the changing deployment models and the issues with
   existing packet designs that need to be addressed.  It concludes by
   looking at some parameters of a solution.

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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   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 September 10, 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Bryant, et al.         Expires September 10, 2020               [Page 1]
Internet-Draft                   FWD PS                       March 2020

   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.  Forwarding Layer  . . . . . . . . . . . . . . . . . . . .   4
   2.  New Use Cases for packet networks . . . . . . . . . . . . . .   5
     2.1.  Video and AR/VR . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Role of Fixed Networks in 5G and Beyond 5G  . . . . . . .   6
     2.3.  ITU-T Focus Group Network-2030  . . . . . . . . . . . . .   6
   3.  New Network Capabilities and Services . . . . . . . . . . . .   8
     3.1.  New Services  . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  New Capabilities  . . . . . . . . . . . . . . . . . . . .   9
   4.  Underlying New Requirements . . . . . . . . . . . . . . . . .  10
     4.1.  Better than Best Effort . . . . . . . . . . . . . . . . .  10
     4.2.  Efficient Packet Design . . . . . . . . . . . . . . . . .  10
     4.3.  Forwarding Identifiers  . . . . . . . . . . . . . . . . .  11
     4.4.  Operational visibility  . . . . . . . . . . . . . . . . .  12
     4.5.  Holistic solution . . . . . . . . . . . . . . . . . . . .  12
   5.  Deployment Models . . . . . . . . . . . . . . . . . . . . . .  13
     5.1.  Edge-2-Edge Model . . . . . . . . . . . . . . . . . . . .  13
     5.2.  End-2-End Model Single Provider . . . . . . . . . . . . .  13
     5.3.  End-2-End Model with multiple Providers . . . . . . . . .  14
     5.4.  Embedded Service  . . . . . . . . . . . . . . . . . . . .  15
     5.5.  Embedded Global Service . . . . . . . . . . . . . . . . .  16
   6.  Existing Protocol and Layering Challenges and Gaps  . . . . .  17
     6.1.  Challenges with IPv6  . . . . . . . . . . . . . . . . . .  17
       6.1.1.  The End-to-End Model  . . . . . . . . . . . . . . . .  17
       6.1.2.  Fixed Address Length  . . . . . . . . . . . . . . . .  21
     6.2.  Better Than Best Effort E2E Network Services  . . . . . .  22
     6.3.  Adaptive Bit-rate Video streaming . . . . . . . . . . . .  23
     6.4.  DetNet and Higher Precision Networking Service  . . . . .  24
     6.5.  Forwarding Plane vs. Control Plane  . . . . . . . . . . .  24
     6.6.  User-Network/Network-User Interface Signaling . . . . . .  26
   7.  Candidate Solution Directions . . . . . . . . . . . . . . . .  26
     7.1.  Variable Length Addresses . . . . . . . . . . . . . . . .  27
     7.2.  Address Semantics . . . . . . . . . . . . . . . . . . . .  27
     7.3.  Multiple Instructions . . . . . . . . . . . . . . . . . .  28