A Stateless Transport Tunneling Protocol for Network Virtualization (STT)
draft-davie-stt-08

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Last updated 2016-04-28
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Network Working Group                                      B. Davie, Ed.
Internet-Draft                                                  J. Gross
Intended status: Informational                              VMware, Inc.
Expires: October 30, 2016                                 April 28, 2016

  A Stateless Transport Tunneling Protocol for Network Virtualization
                                 (STT)
                           draft-davie-stt-08

Abstract

   Network Virtualization places unique requirements on tunneling
   protocols.  This draft describes STT (Stateless Transport Tunneling),
   a tunnel encapsulation that enables overlay networks to be built in
   virtualized networks.  STT is particularly useful when some tunnel
   endpoints are in end-systems, as it utilizes the capabilities of the
   network interface card to improve performance.  This draft documents
   the protocol and the rationale for its design, and highlights issues
   that may arise in deployments.

Status of This Memo

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   This Internet-Draft will expire on October 30, 2016.

Copyright Notice

   Copyright (c) 2016 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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Davie & Gross           Expires October 30, 2016                [Page 1]
Internet-Draft              The STT Protocol                  April 2016

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     1.3.  Reference Model . . . . . . . . . . . . . . . . . . . . .   5
   2.  Design Rationale  . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Segmentation Offload  . . . . . . . . . . . . . . . . . .   6
     2.2.  Metadata  . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.3.  Context Information . . . . . . . . . . . . . . . . . . .   7
     2.4.  Alignment . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.5.  Equal Cost Multipath  . . . . . . . . . . . . . . . . . .   8
     2.6.  Efficient Software Processing . . . . . . . . . . . . . .   8
   3.  Frame Formats . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  STT Frame Format  . . . . . . . . . . . . . . . . . . . .   9
       3.1.1.  Handling non-TCP/IP and non-UDP/IP payloads . . . . .  12
     3.2.  Usage of TCP Header by STT  . . . . . . . . . . . . . . .  13
     3.3.  Encapsulation of STT Segments in IP . . . . . . . . . . .  15
       3.3.1.  Diffserv and ECN-Marking  . . . . . . . . . . . . . .  15
       3.3.2.  Packet Loss . . . . . . . . . . . . . . . . . . . . .  15
     3.4.  Broadcast and Multicast . . . . . . . . . . . . . . . . .  16
   4.  Interoperability Issues . . . . . . . . . . . . . . . . . . .  16
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  19
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   Network Virtualization places unique requirements on tunneling
   protocols.  The utility of tunneling in virtualized data centers has
   been described elsewhere; see, for example [RFC7364], [VL2],
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