Problem Statement for ARMD
draft-ietf-armd-problem-statement-01

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Last updated 2012-02-21 (latest revision 2011-10-17)
Replaces draft-narten-armd-problem-statement
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Internet Engineering Task Force                                T. Narten
Internet-Draft                                                       IBM
Intended status: Informational                                  M. Karir
Expires: August 24, 2012                              Merit Network Inc.
                                                                  I. Foo
                                                     Huawei Technologies
                                                       February 21, 2012

                       Problem Statement for ARMD
                  draft-ietf-armd-problem-statement-01

Abstract

   This document examines issues related to the massive scaling of data
   centers.  Our initial scope is relatively narrow.  Specifically, we
   focus on address resolution (ARP and ND) within the data center.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on August 24, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Generalized Data Center Design . . . . . . . . . . . . . . . .  6
     4.1.  Access Layer . . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  Aggregation Layer  . . . . . . . . . . . . . . . . . . . .  7
     4.3.  Core . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.4.  Layer 3 / Layer 2 Topological Variations . . . . . . . . .  8
       4.4.1.  Layer 3 to Access Switches . . . . . . . . . . . . . .  8
       4.4.2.  L3 to Aggregation Switches . . . . . . . . . . . . . .  8
       4.4.3.  L3 in the Core only  . . . . . . . . . . . . . . . . .  8
       4.4.4.  Overlays . . . . . . . . . . . . . . . . . . . . . . .  9
     4.5.  Factors that Affect Data Center Design . . . . . . . . . .  9
       4.5.1.  Traffic Patterns . . . . . . . . . . . . . . . . . . .  9
       4.5.2.  Virtualization . . . . . . . . . . . . . . . . . . . . 10
   5.  Address Resolution in IPv4 . . . . . . . . . . . . . . . . . . 10
   6.  Problem Itemization  . . . . . . . . . . . . . . . . . . . . . 11
     6.1.  ARP Processing on Routers  . . . . . . . . . . . . . . . . 11
     6.2.  IPv6 Neighbor Discovery  . . . . . . . . . . . . . . . . . 13
     6.3.  MAC Address Table Size Limitations in Switches . . . . . . 13
   7.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  Open Issues  . . . . . . . . . . . . . . . . . . . . . . . . . 14
   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 14
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   12. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     12.1. Changes between -00 and -01  . . . . . . . . . . . . . . . 15
   13. Informative References . . . . . . . . . . . . . . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15

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1.  Introduction

   This document examines issues related to the massive scaling of data
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