Sub-path Transport Layer Problem Statement
draft-herbert-sub-path-ps-00

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INTERNET-DRAFT                                                T. Herbert
Intended Status: Informational                                Quantonium
Expires: March 2019                                                     
                                                                        
                                                      September 25, 2018

               Sub-path Transport Layer Problem Statement
                      draft-herbert-sub-path-ps-00

Abstract

   This document presents the problem statement and use cases for a sub-
   path transport layer. A sub-path is a portion of a network path that
   has localized characteristics that are of interest to an operator to
   manage. The  structure for managing a sub-path is the "sub-path
   transport layer". A sub-path transport layer can provide transport
   layer mechanisms, such as reliability and congestion control, over
   the aggregate of packets traversing the sub-path. Additionally, a
   sub-path transport layer can provide performance measurements of
   traffic over a sub-path which in turn can be input to operations and
   management. The sub-path transport layer implies the possibility that
   traffic may be subject to two transport layer control loops, that of
   the sub-path and that of a higher layer transport protocol, any such
   solution must consider the ramifications of that.

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T. Herbert               Expires March 29, 2019                 [Page 1]
INTERNET DRAFT         draft-herbert-sub-path-ps                        

Copyright and License Notice

   Copyright (c) 2018 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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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1 Passive measurement  . . . . . . . . . . . . . . . . . . . .  3
     1.2 Transport layer mechanisms . . . . . . . . . . . . . . . . .  3
   2  Use cases . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1 Lossy access network . . . . . . . . . . . . . . . . . . . .  4
     2.2 Low latency handover . . . . . . . . . . . . . . . . . . . .  4
     2.3 Congestion control for nest of mice  . . . . . . . . . . . .  5
   3  Existing solutions  . . . . . . . . . . . . . . . . . . . . . .  6
     3.1 Layer 2 protocols with transport layer functionality . . . .  6
     3.2 TCP proxies  . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.3 In-situ OAM  . . . . . . . . . . . . . . . . . . . . . . . .  7
   4  Sub-path transport layer solution . . . . . . . . . . . . . . .  7
     4.1 Sub-path tunnels . . . . . . . . . . . . . . . . . . . . . .  7
     4.2 Nested control loop problem  . . . . . . . . . . . . . . . .  7
       4.2.1 Avoiding conflict with higher layer transports . . . . .  8
       4.2.2 Work in concert with higher layer transports . . . . . .  8
     4.3 Advanced features  . . . . . . . . . . . . . . . . . . . . .  8
   5  References  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     5.1  Normative References  . . . . . . . . . . . . . . . . . . .  9
     5.2  Informative References  . . . . . . . . . . . . . . . . . .  9
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . .  9

 

T. Herbert               Expires March 29, 2019                 [Page 2]
INTERNET DRAFT         draft-herbert-sub-path-ps                        

1  Introduction

   This document presents the problem statement that motivates defining
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