Problem Statement for ARMD
draft-ietf-armd-problem-statement-03

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Document Type Active Internet-Draft (armd WG)
Last updated 2012-08-30 (latest revision 2012-06-22)
Replaces draft-narten-armd-problem-statement
Stream IETF
Intended RFC status Informational
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Consensus Unknown
Document shepherd Linda Dunbar
IESG IESG state IESG Evaluation::Revised I-D Needed
Telechat date
Needs a YES.
Responsible AD Ron Bonica
Send notices to armd-chairs@tools.ietf.org, draft-ietf-armd-problem-statement@tools.ietf.org
Internet Engineering Task Force                                T. Narten
Internet-Draft                                                       IBM
Intended status: Informational                                  M. Karir
Expires: December 24, 2012                            Merit Network Inc.
                                                                  I. Foo
                                                     Huawei Technologies
                                                           June 22, 2012

                       Problem Statement for ARMD
                  draft-ietf-armd-problem-statement-03

Abstract

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

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 24, 2012.

Copyright Notice

   Copyright (c) 2012 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
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   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  Address Resolution in IPv4 . . . . . . . . . . . . . . . . . .  6
   5.  Address Resolution in IPv6 . . . . . . . . . . . . . . . . . .  7
   6.  Generalized Data Center Design . . . . . . . . . . . . . . . .  7
     6.1.  Access Layer . . . . . . . . . . . . . . . . . . . . . . .  8
     6.2.  Aggregation Layer  . . . . . . . . . . . . . . . . . . . .  8
     6.3.  Core . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     6.4.  L3 / L2 Topological Variations . . . . . . . . . . . . . .  9
       6.4.1.  L3 to Access Switches  . . . . . . . . . . . . . . . .  9
       6.4.2.  L3 to Aggregation Switches . . . . . . . . . . . . . .  9
       6.4.3.  L3 in the Core only  . . . . . . . . . . . . . . . . . 10
       6.4.4.  Overlays . . . . . . . . . . . . . . . . . . . . . . . 10
     6.5.  Factors that Affect Data Center Design . . . . . . . . . . 10
       6.5.1.  Traffic Patterns . . . . . . . . . . . . . . . . . . . 10
       6.5.2.  Virtualization . . . . . . . . . . . . . . . . . . . . 11
       6.5.3.  Summary  . . . . . . . . . . . . . . . . . . . . . . . 11
   7.  Problem Itemization  . . . . . . . . . . . . . . . . . . . . . 12
     7.1.  ARP Processing on Routers  . . . . . . . . . . . . . . . . 12
     7.2.  IPv6 Neighbor Discovery  . . . . . . . . . . . . . . . . . 13
     7.3.  MAC Address Table Size Limitations in Switches . . . . . . 14
   8.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 15
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 15
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   12. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     12.1. Changes from -02 . . . . . . . . . . . . . . . . . . . . . 15
     12.2. Changes from -01 . . . . . . . . . . . . . . . . . . . . . 16
     12.3. Changes from -00 . . . . . . . . . . . . . . . . . . . . . 16
   13. Informative References . . . . . . . . . . . . . . . . . . . . 16
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

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