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Virtual eXtensible Local Area Network (VXLAN): A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
RFC 7348

Independent Submission                                     M. Mahalingam
Request for Comments: 7348                                     Storvisor
Category: Informational                                          D. Dutt
ISSN: 2070-1721                                         Cumulus Networks
                                                                 K. Duda
                                                                  Arista
                                                              P. Agarwal
                                                                Broadcom
                                                              L. Kreeger
                                                                   Cisco
                                                              T. Sridhar
                                                                  VMware
                                                              M. Bursell
                                                                   Intel
                                                               C. Wright
                                                                 Red Hat
                                                             August 2014

       Virtual eXtensible Local Area Network (VXLAN): A Framework
   for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks

Abstract

   This document describes Virtual eXtensible Local Area Network
   (VXLAN), which is used to address the need for overlay networks
   within virtualized data centers accommodating multiple tenants.  The
   scheme and the related protocols can be used in networks for cloud
   service providers and enterprise data centers.  This memo documents
   the deployed VXLAN protocol for the benefit of the Internet
   community.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7348.

Mahalingam, et al.            Informational                     [Page 1]
RFC 7348                          VXLAN                      August 2014

Copyright Notice

   Copyright (c) 2014 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.

Table of Contents

   1. Introduction ....................................................3
      1.1. Acronyms and Definitions ...................................4
   2. Conventions Used in This Document ...............................4
   3. VXLAN Problem Statement .........................................5
      3.1. Limitations Imposed by Spanning Tree and VLAN Ranges .......5
      3.2. Multi-tenant Environments ..................................5
      3.3. Inadequate Table Sizes at ToR Switch .......................6
   4. VXLAN ...........................................................6
      4.1. Unicast VM-to-VM Communication .............................7
      4.2. Broadcast Communication and Mapping to Multicast ...........8
      4.3. Physical Infrastructure Requirements .......................9
   5. VXLAN Frame Format .............................................10
   6. VXLAN Deployment Scenarios .....................................14
      6.1. Inner VLAN Tag Handling ...................................18
   7. Security Considerations ........................................18
   8. IANA Considerations ............................................19
   9. References .....................................................19
      9.1. Normative References ......................................19
      9.2. Informative References ....................................20
   10. Acknowledgments ...............................................21

Mahalingam, et al.            Informational                     [Page 2]
RFC 7348                          VXLAN                      August 2014

1.  Introduction

   Server virtualization has placed increased demands on the physical

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