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Directory Assistance Problem and High-Level Design Proposal
RFC 7067

Internet Engineering Task Force (IETF)                         L. Dunbar
Request for Comments: 7067                                   D. Eastlake
Category: Informational                                           Huawei
ISSN: 2070-1721                                               R. Perlman
                                                                   Intel
                                                            I. Gashinsky
                                                                   Yahoo
                                                           November 2013

      Directory Assistance Problem and High-Level Design Proposal

Abstract

   Edge TRILL (Transparent Interconnection of Lots of Links) switches
   currently learn the mapping between MAC (Media Access Control)
   addresses and their egress TRILL switch by observing the data packets
   they ingress or egress or by the TRILL ESADI (End-Station Address
   Distribution Information) protocol.  When an ingress TRILL switch
   receives a data frame for a destination address (MAC&Label) that the
   switch does not know, the data frame is flooded within the frame's
   Data Label across the TRILL campus.

   This document describes the framework for using directory services to
   assist edge TRILL switches in reducing multi-destination frames,
   particularly unknown unicast frames flooding, and ARP/ND (Address
   Resolution Protocol / Neighbor Discovery), thus improving TRILL
   network scalability and security.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7067.

Dunbar, et al.                Informational                     [Page 1]
RFC 7067            TRILL: Directory Assist Framework      November 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
   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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Impact of Massive Number of End Stations ........................5
      3.1. Issues of Flooding-Based Learning in Data Centers ..........5
      3.2. Two Examples ...............................................6
   4. Benefits of Directory-Assisted TRILL Edge .......................7
   5. Generic Operation of Directory Assistance .......................8
      5.1. Information in Directory for Edge RBridges .................8
      5.2. Push Model and Requirements ................................9
      5.3. Pull Model and Requirements ...............................11
   6. Recommendation .................................................12
   7. Security Considerations ........................................12
   8. Acknowledgements ...............................................13
   9. Informative References .........................................14

Dunbar, et al.                Informational                     [Page 2]
RFC 7067            TRILL: Directory Assist Framework      November 2013

1.  Introduction

   Edge TRILL (Transparent Interconnection of Lots of Links) switches
   (devices implementing [RFC6325], also known as RBridges) currently
   learn the mapping between destination MAC addresses and their egress
   TRILL switch by observing data packets or by the ESADI (End-Station
   Address Distribution Information) protocol.  When an ingress RBridge
   (Routing Bridge) receives a data frame for a destination address
   (MAC&Label) that RBridge does not know, the data frame is flooded
   within that Data Label across the TRILL campus. (Data Labels are

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