The Scalable Address Resolution Protocol (SARP) for Large Data Centers
RFC 7586

Document Type RFC - Experimental (June 2015; No errata)
Was draft-nachum-sarp (individual)
Last updated 2015-10-14
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Independent Submission                                         Y. Nachum
Request for Comments: 7586
Category: Experimental                                         L. Dunbar
ISSN: 2070-1721                                                   Huawei
                                                           I. Yerushalmi
                                                              T. Mizrahi
                                                                 Marvell
                                                               June 2015

            The Scalable Address Resolution Protocol (SARP)
                         for Large Data Centers

Abstract

   This document introduces the Scalable Address Resolution Protocol
   (SARP), an architecture that uses proxy gateways to scale large data
   center networks.  SARP is based on fast proxies that significantly
   reduce switches' Filtering Database (FDB) table sizes and reduce
   impact of ARP and Neighbor Discovery (ND) on network elements in an
   environment where hosts within one subnet (or VLAN) can spread over
   various locations.  SARP is targeted for massive data centers with a
   significant number of Virtual Machines (VMs) that can move across
   various physical locations.

Independent Submissions Editor Note

   This is an Experimental document; that experiment will end two years
   after the RFC is published.  At that point, the RFC authors will
   attempt to determine how widely SARP has been implemented and used.

IESG Note

   The IESG notes that the problems described in RFC 6820 can already be
   addressed through the simple combination of existing standardized or
   other published techniques including Layer 2 VPN (RFC 4664), proxy
   ARP (RFC 925), proxy Neighbor Discovery (RFC 4389), IGMP and MLD
   snooping (RFC 4541), and ARP mediation for IP interworking of Layer 2
   VPNs (RFC 6575).

Nachum, et al.                Experimental                      [Page 1]
RFC 7586                          SARP                         June 2015

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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/rfc7586.

Copyright Notice

   Copyright (c) 2015 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.

Nachum, et al.                Experimental                      [Page 2]
RFC 7586                          SARP                         June 2015

Table of Contents

   1. Introduction ....................................................3
      1.1. SARP Motivation ............................................4
      1.2. SARP Overview ..............................................7
      1.3. SARP Deployment Options ....................................8
      1.4. Comparison with Existing Solutions .........................9
   2. Terms and Abbreviations Used in This Document ..................10
   3. SARP: Theory of Operation ......................................11
      3.1. Control Plane: ARP/ND .....................................11
           3.1.1. ARP/NS Request for a Local VM ......................11
           3.1.2. ARP/NS Request for a Remote VM .....................12
           3.1.3. Gratuitous ARP and Unsolicited Neighbor
                  Advertisement (UNA) ................................13
      3.2. Data Plane: Packet Transmission ...........................13
           3.2.1. Local Packet Transmission ..........................13
           3.2.2. Packet Transmission between Sites ..................13
      3.3. VM Migration ..............................................14
           3.3.1. VM Local Migration .................................14
           3.3.2. VM Migration from One Site to Another ..............14
                  3.3.2.1. Impact on IP-to-MAC Mapping Cache
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