NVO3 Encapsulation Considerations
draft-ietf-nvo3-encap-03

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INTERNET-DRAFT                                         Sami Boutros(Ed.)
Intended Status: Informational                                    VMware

Expires: January 2, 2020                                    July 1, 2019

                   NVO3 Encapsulation Considerations 
                        draft-ietf-nvo3-encap-03

Abstract

   As communicated by WG Chairs, the IETF NVO3 chairs and Routing Area
   director have chartered a design team to take forward the
   encapsulation discussion and see if there is potential to design a
   common encapsulation that addresses the various technical concerns.

   There are implications of different encapsulations in real
   environments consisting of both software and hardware implementations
   and spanning multiple data centers. For example, OAM functions such
   as path MTU discovery become challenging with multiple encapsulations
   along the data path. 

   The design team recommend Geneve with few modifications as the common
   encapsulation, more details are described in section 7.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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Copyright and License Notice

   Copyright (c) 2019 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. Problem Statement . . . . . . . . . . . . . . . . . . . . . . .  4
   2. Design Team Goals . . . . . . . . . . . . . . . . . . . . . . .  4
   3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4. Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . .  4
   5. Issues with current Encapsulations  . . . . . . . . . . . . . .  5
     5.1 Geneve . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     5.2 GUE  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     5.3 VXLAN-GPE  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   6. Common Encapsulation Considerations . . . . . . . . . . . . . .  6
     6.1 Current Encapsulations . . . . . . . . . . . . . . . . . . .  6
     6.2 Useful Extensions Use cases  . . . . . . . . . . . . . . . .  6
       6.2.1. Telemetry extensions. . . . . . . . . . . . . . . . . .  6
       6.2.2. Security/Integrity extensions . . . . . . . . . . . . .  7
       6.2.3. Group Base Policy . . . . . . . . . . . . . . . . . . .  7
     6.3 Hardware Considerations  . . . . . . . . . . . . . . . . . .  7
     6.4 Extension Size . . . . . . . . . . . . . . . . . . . . . . .  8
     6.5 Extension Ordering . . . . . . . . . . . . . . . . . . . . .  9
     6.6 TLV vs Bit Fields  . . . . . . . . . . . . . . . . . . . . .  9
     6.7 Control Plane Considerations . . . . . . . . . . . . . . . . 10
     6.8 Split NVE  . . . . . . . . . . . . . . . . . . . . . . . . . 11
     6.9 Larger VNI Considerations  . . . . . . . . . . . . . . . . . 11
   7. Design team recommendations . . . . . . . . . . . . . . . . . . 11
   8. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 14
   9. Security Considerations . . . . . . . . . . . . . . . . . . . . 14
   10.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 14
     10.1  Normative References . . . . . . . . . . . . . . . . . . . 14
     10.2  Informative References . . . . . . . . . . . . . . . . . . 15
   11. Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     11.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . 15
 

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