Scaling the Address Resolution Protocol for Large Data Centers (SARP)
draft-nachum-sarp-06

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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 15, 2013

     Scaling the Address Resolution Protocol for Large Data Centers
                                (SARP)
                       draft-nachum-sarp-06.txt

Abstract

   This document introduces SARP, an architecture that uses proxy
   gateways to scale large 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
   where hosts within one subnet (or VLAN) can spread over various
   locations. SARP is targeted for massive data centers with a
   significant number of VMs that can move across various physical
   locations.

Status of this Memo

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   This Internet-Draft will expire on January 15, 2014.

Nachum, et al.        Expires January 15, 2014                [Page 1]
Internet-Draft                  SARP                         July 2013

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
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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................................. 8
   2. Terms and Abbreviations Used in this Document ............... 9
   3. SARP Description ........................................... 10
      3.1. Control Plane: ARP/ND ................................. 10
         3.1.1. ARP/NS Request for a Local VM .................... 10
         3.1.2. ARP/NS Request for a Remote VM ................... 10
         3.1.3. Gratuitous ARP and Unsolicited Neighbor 
                Advertisement (UNA) .............................. 11
      3.2. Data Plane: Packet Transmission ....................... 12
         3.2.1. Local Packet Transmission ........................ 12
         3.2.2. Packet Transmission Between Sites ................ 12
      3.3. VM Migration .......................................... 13
         3.3.1. VM Local Migration................................ 13
         3.3.2. VM Migration from One Site to Another ............ 13
            3.3.2.1. Impact to IP<->MAC Mapping Cache Table of VMs 
                being moved ...................................... 15
      3.4. Multicast and Broadcast................................ 15
      3.5. Non IP packet ......................................... 15
      3.6. IP<->MAC caching on SARP Proxy ........................ 16
      3.7. High availability and load balancing .................. 17
      3.8. SARP Interaction with Overlay networks ................ 18
   4. Conclusions ................................................ 18
   5. Security Considerations..................................... 18
   6. IANA Considerations ........................................ 19
   7. References ................................................. 19
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