BFD for Geneve
draft-xiao-nvo3-bfd-geneve-00

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Last updated 2019-07-08
Replaces draft-xiao-bfd-geneve
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NVO3 Working Group                                                X. Min
Internet-Draft                                                 G. Mirsky
Intended status: Informational                                       ZTE
Expires: January 9, 2020                                    July 8, 2019

                             BFD for Geneve
                     draft-xiao-nvo3-bfd-geneve-00

Abstract

   This document describes the use of the Bidirectional Forwarding
   Detection (BFD) protocol in point-to-point Generic Network
   Virtualization Encapsulation (Geneve) tunnels forming up an overlay
   network.

Status of This Memo

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

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   This Internet-Draft will expire on January 9, 2020.

Copyright 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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  BFD Packet Transmission over Geneve Tunnel  . . . . . . . . .   3
     3.1.  BFD Encapsulation With Inner Ethernet/IP/UDP Header . . .   3
     3.2.  BFD Encapsulation With Inner IP/UDP Header  . . . . . . .   5
     3.3.  BFD Encapsulation With Inner MPLS Header  . . . . . . . .   7
     3.4.  BFD Encapsulation With Inner OAM Shim . . . . . . . . . .   9
   4.  Reception of BFD packet from Geneve Tunnel  . . . . . . . . .  10
     4.1.  Demultiplexing of the BFD packet  . . . . . . . . . . . .  11
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   "Generic Network Virtualization Encapsulation" (Geneve)
   [I-D.ietf-nvo3-geneve] provides an encapsulation scheme that allows
   building an overlay network by decoupling the address space of the
   attached virtual hosts from that of the network.

   This document describes the use of Bidirectional Forwarding Detection
   (BFD) protocol [RFC5880] to enable monitoring continuity of the path
   between two Geneve tunnel endpoints, which may be NVE (Network
   Virtualization Edge) or other device acting as a Geneve tunnel
   endpoint.  For simplicity, in this document, NVE is used to represent
   Geneve tunnel endpoint, Virtual Machine (VM) is used to represent the
   device attached to a Geneve tunnel endpoint from the outside.

   The use cases and the deployment of BFD for Geneve are consistent
   with what's described in Section 1 and Section 3 of
   [I-D.ietf-bfd-vxlan].  The major difference between Geneve and
   "Virtual eXtensible Local Area Network" (VXLAN) [RFC7348]
   encapsulation is that Geneve supports multi-protocol payload and
   variable length options.

2.  Conventions Used in This Document

2.1.  Terminology

   BFD: Bidirectional Forwarding Detection

   CC: Continuity Check

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   GAL: Generic Associated Channel Label

   G-ACh: Generic Associated Channel

   Geneve: Generic Network Virtualization Encapsulation

   MPLS: Multiprotocol Label Switching

   NVE: Network Virtualization Edge

   VM: Virtual Machine

   VNI: Virtual Network Identifier
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