TRILL (Transparent Interconnection of Lots of Links): Edge Directory Assistance Framework
draft-ietf-trill-directory-framework-04

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Document Type Active Internet-Draft (trill WG)
Last updated 2013-02-25
Replaces draft-dunbar-trill-directory-assisted-edge
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INTERNET-DRAFT                                              Linda Dunbar
Intended Status: Informational                           Donald Eastlake
                                                                  Huawei
                                                           Radia Perlman
                                                                   Intel
                                                          Igor Gashinsky
                                                                   Yahoo
Expires: August 22, 2012                               February 23, 2013

         TRILL (Transparent Interconnection of Lots of Links):
                  Edge Directory Assistance Framework
             <draft-ietf-trill-directory-framework-04.txt>

Abstract

   Edge RBridges currently learn the mapping between MAC addresses and
   their egress RBridges by observing the data packets they ingress or
   egress or by the TRILL ESADI protocol. When an ingress RBridge
   receives a data frame whose destination address (MAC&VLAN) that
   RBridge does not know, the data frame is flooded within the VLAN
   across the TRILL campus.

   This document describes the framework for using directory services to
   assist edge RBridges in reducing multi-destination frames,
   particularly unknown unicast frames flooding, and ARP/ND, thus
   improving TRILL (Transparent Interconnection of Lots of Links)
   network scalability.

Status of This Memo

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

   Distribution of this document is unlimited. Comments should be sent
   to the TRILL working group mailing list.

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L. Dunbar, et al                                                [Page 1]
INTERNET-DRAFT                         TRILL: Directory Assist Framework

   The list of current Internet-Drafts can be accessed at
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L. Dunbar, et al                                                [Page 2]
INTERNET-DRAFT                         TRILL: Directory Assist Framework

Table of Contents

      1. Introduction............................................4
      2. Terminology.............................................5

      3. Impact of Massive Number of End Stations................6
      3.1 Issues of Flooding Based Learning in Data Centers......6
      3.2 Two Examples...........................................7

      4. Benefits of Directory Assisted Edge RBridge.............8

      5. Generic operation of Directory Assistance..............10
      5.1 Information in Directory for Edge RBridges............10
      5.2 Push Model and Requirements...........................10
      5.3 Pull Model and Requirements...........................12

      6. Recommendation.........................................14

      7. Security Considerations................................14
      8. IANA Considerations....................................14
      9. Acknowledgements.......................................14

      10. References............................................15
      10.1 Normative References.................................15
      10.2 Informative References...............................15

      Authors' Addresses........................................16

L. Dunbar, et al                                                [Page 3]
INTERNET-DRAFT                         TRILL: Directory Assist Framework

1. Introduction

   Edge RBridges (devices implementing [RFC6325], also known as TRILL
   Switches) currently learn the mapping between destination MAC
   addresses and their egress RBridges by observing data packets or by
   the ESADI (End Station Address Distribution Information) protocol.
   When an ingress RBridge receives a data frame for a destination
   address (MAC&VLAN) that RBridge does not know, the data frame is
   flooded within that VLAN across the TRILL campus.

   This document describes a framework for using directory services to
   assist edge RBridges by reducing multi-destination frames,
   particularly ARP [RFC826], ND [RFC4861], and unknown unicast,
   improving TRILL network scalability in environments where a directory
   can be available, such as data centers.

   Data center networks differ from enterprise campus networks in
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