NVO3 Encapsulation Considerations
draft-ietf-nvo3-encap-05

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Last updated 2020-02-17
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NVO3 Workgroup                                           S. Boutros, Ed.
Internet-Draft                                                     Ciena
Intended status: Informational                         February 17, 2020
Expires: August 20, 2020

                   NVO3 Encapsulation Considerations
                        draft-ietf-nvo3-encap-05

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

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Boutros                  Expires August 20, 2020                [Page 1]
Internet-Draft      NVO3 Encapsulation Considerations      February 2020

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Table of Contents

   1.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Design Team Goals . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Abbreviations . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Issues with current Encapsulations  . . . . . . . . . . . . .   4
     5.1.  Geneve  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.2.  GUE . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.3.  VXLAN-GPE . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Common Encapsulation Considerations . . . . . . . . . . . . .   5
     6.1.  Current Encapsulations  . . . . . . . . . . . . . . . . .   5
     6.2.  Useful Extensions Use cases . . . . . . . . . . . . . . .   5
       6.2.1.  Telemetry extensions. . . . . . . . . . . . . . . . .   6
       6.2.2.  Security/Integrity extensions . . . . . . . . . . . .   6
       6.2.3.  Group Base Policy . . . . . . . . . . . . . . . . . .   7
     6.3.  Hardware Considerations . . . . . . . . . . . . . . . . .   7
     6.4.  Extension Size  . . . . . . . . . . . . . . . . . . . . .   7
     6.5.  Extension Ordering  . . . . . . . . . . . . . . . . . . .   8
     6.6.  TLV vs Bit Fields . . . . . . . . . . . . . . . . . . . .   8
     6.7.  Control Plane Considerations  . . . . . . . . . . . . . .   9
     6.8.  Split NVE . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.9.  Larger VNI Considerations . . . . . . . . . . . . . . . .  11
   7.  Design team recommendations . . . . . . . . . . . . . . . . .  11
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   11. Appendix A  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.2.  Extensibility  . . . . . . . . . . . . . . . . . . . . .  14
       11.2.1.  Native Extensibility Support . . . . . . . . . . . .  14
       11.2.2.  Extension Parsing  . . . . . . . . . . . . . . . . .  14
       11.2.3.  Critical Extensions  . . . . . . . . . . . . . . . .  15
       11.2.4.  Maximal Header Length  . . . . . . . . . . . . . . .  15
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