Scaling the Address Resolution Protocol for Large Data Centers (SARP)
draft-nachum-sarp-05

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INTAREA Working Group                                      Youval Nachum
Internet Draft                                                   Marvell
Intended status: Proposed Standard                          Linda Dunbar
Expires: January 2014                                             Huawei
                                                         Ilan Yerushalmi
                                                             Tal Mizrahi
                                                                 Marvell
                                                           July 11, 2013

       Scaling the Address Resolution Protocol for Large Data Centers
                                  (SARP)
                         draft-nachum-sarp-05.txt

Abstract

   This document introduces SARP, an architecture that uses proxy
   gateways and allows to scale data center networks. SARP is based on
   fast proxies that significantly reduce switches' FDB (MAC table)
   sizes and ARP/ND impact on network elements in an environment that
   hosts within one subnet (or VLAN) can spread over various locations.
   SARP supports smooth and fast virtual machine (VM) mobility without
   any modification to the VM, while keeping the connection up and
   running efficiently.  SARP is targeted for massive scaling data
   centers with a significant number of VMs that can move across various
   physical locations.

Status of this Memo

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

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   This Internet-Draft will expire on January 11, 2014.

Nachum, et al.        Expires January 11, 2014                [Page 1]
Internet-Draft                  SARP                         July 2013

Copyright Notice

   Copyright (c) 2013 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 ................................................. 3
      1.1. SARP Motivation.......................................... 3
      1.2. SARP Overview ........................................... 6
      1.3. SARP Deployment Options ................................. 7
   2. Terms and Abbreviations Used in this Document ................ 8
   3. SARP Description ............................................. 9
      3.1. Control Plane: ARP/ND ................................... 9
         3.1.1. ARP/NS Request for a Local VM ...................... 9
         3.1.2. ARP/NS Request for a Remote VM ..................... 9
         3.1.3. Gratuitous ARP and Unsolicited Neighbor Advertisement
         (UNA) .................................................... 10
      3.2. Data Plane: Packet Transmission ........................ 10
         3.2.1. Local Packet Transmission ......................... 10
         3.2.2. Packet Transmission Between Sites ................. 10
      3.3. VM Migration ........................................... 12
         3.3.1. VM Local Migration ................................ 12
         3.3.2. VM Migration from One Site to Another ............. 12
            3.3.2.1. Impact to IP<->MAC Mapping Cache Table of VMs being
            moved ................................................. 13
      3.4. Multicast and Broadcast ................................ 14
      3.5. Non IP packet .......................................... 14
      3.6. IP<->MAC caching on SARP Proxy ......................... 14
      3.7. High availability and load balancing ................... 15
      3.8. SARP Interaction with Overlay networks ................. 16
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