Problem Statement for ARMD
draft-ietf-armd-problem-statement-02

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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: September 13, 2012                           Merit Network Inc.
                                                                  I. Foo
                                                     Huawei Technologies
                                                          March 12, 2012

                       Problem Statement for ARMD
                  draft-ietf-armd-problem-statement-02

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
   Task Force (IETF).  Note that other groups may also distribute
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   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 September 13, 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
   to this document.  Code Components extracted from this document must
   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.  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.  Address Resolution in IPv6 . . . . . . . . . . . . . . . . . . 11
   7.  Problem Itemization  . . . . . . . . . . . . . . . . . . . . . 11
     7.1.  ARP Processing on Routers  . . . . . . . . . . . . . . . . 11
     7.2.  IPv6 Neighbor Discovery  . . . . . . . . . . . . . . . . . 13
     7.3.  MAC Address Table Size Limitations in Switches . . . . . . 14
   8.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 14
   10. IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
   11. Security Considerations  . . . . . . . . . . . . . . . . . . . 15
   12. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     12.1. Changes from -01 . . . . . . . . . . . . . . . . . . . . . 15
     12.2. Changes from -00 . . . . . . . . . . . . . . . . . . . . . 15
   13. Informative References . . . . . . . . . . . . . . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16

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