Overlayed Path Segment Forwarding (OPSF) Problem Statement
draft-li-overlayed-path-segment-forwarding-ps-00

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TSVWG                                                              Y. Li
INTERNET-DRAFT                                                   X. Zhou
Intended Status: Informational                                    Huawei
Expires: March 30, 2019                               September 26, 2018

       Overlayed Path Segment Forwarding (OPSF) Problem Statement
            draft-li-overlayed-path-segment-forwarding-ps-00

Abstract

   Various overlays are used in networks including WAN, enterprise
   campus and others. End to end path are divided into multiple segments
   some of which are overlay encapsulated to achieve better path
   selection, lower latency and so on. Traditional end-to-end transport
   layer is not very responding to microburst and non-congestive packet
   loss caused by the different characteristics of the path segments.
   With the potential transport enhancement for the existing or
   purposely created overlayed path segment, end to end throughput can
   be improved. This document illustrates the problems in some use cases
   and tries to inspire more about whether and how to solve them by
   introducing a reliable, efficient and non-intrusive transport
   forwarding over the overlayed path segment(s).

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

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Li, et al                                                       [Page 1]
INTERNET DRAFT           OPSF Problem Statement           September 2018

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
   2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3. Use Cases and Problems  . . . . . . . . . . . . . . . . . . . .  3
     3.1 Microburst in Long Haul Network  . . . . . . . . . . . . . .  4
     3.2 Non-congestive Loss in WiFi Accessed Campus Overlay  . . . .  6
     3.3 Higher Reliability and Low Latency for Interactive
         Application  . . . . . . . . . . . . . . . . . . . . . . . .  8
   4. Features to be Considered for OPSF (Overlayed Path Segment 
      Forwarding) . . . . . . . . . . . . . . . . . . . . . . . . . .  8
   5. Security Considerations . . . . . . . . . . . . . . . . . . . . 10
   6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 10
   7. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 10
     7.1  Normative References  . . . . . . . . . . . . . . . . . . . 10
     7.2  Informative References  . . . . . . . . . . . . . . . . . . 10
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11

 

Li, et al                                                       [Page 2]
INTERNET DRAFT           OPSF Problem Statement           September 2018

1. Introduction

   Overlay tunnels are widely deployed for various networks, including
   long haul WAN interconnection, enterprise wireless access networks,
   etc. End to end connection are normally broken into multiple path
   segments for different purposes, for instance, selecting a better
   overlay path over the WAN or deliver the packets over the
   heterogenous networks like enterprise access and core networks. 

   TCP-like transport layer provides end to end flow control and
   congestion control for path reliability and high throughput. Such an
   approach has the problems of slow congestion responding and non-
   congestive loss misinterpretation at the sender and does not achieve
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