TRILL: Directory Assistance Mechanisms
draft-dunbar-trill-scheme-for-directory-assist-05

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INTERNET-DRAFT                                              Linda Dunbar
Intended status: Proposed Standard                       Donald Eastlake
                                                                  Huawei
                                                           Radia Perlman
                                                                   Intel
                                                          Igor Gashinsky
                                                                   Yahoo
                                                               Yizhou Li
                                                                  Huawei
Expires: January 14, 2014                                  July 15, 2013

                 TRILL: Directory Assistance Mechanisms
        <draft-dunbar-trill-scheme-for-directory-assist-05.txt>

Abstract
   This document describes mechanisms for using directory server(s) to
   assist TRILL (Transparent Interconnection of Lots of Links) edge
   switches in reducing multi-destination traffic, particularly ARP/ND
   and unknown unicast flooding.

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 Mechanisms

Table of Contents

      1. Introduction............................................3
      1.1 Terminology............................................3
      1.2 Circumstances Causing Directory Use....................4

      2. Push Model Directory Assistance Mechanisms..............5
      2.1 Requesting Push Service................................5
      2.2 Push Directory Servers.................................5
      2.3 Multiple Push Directory Servers........................5
      2.3 Additional Push Details................................7

      3. Pull Model Directory Assistance Mechanisms..............8
      3.1 Pull Directory Request Format..........................8
      3.2 Pull Directory Response Format........................11
      3.3 Pull Directory Hosted on an End Station...............13
      3.4 Pull Directory Request Errors.........................15
      3.5 Cache Consistency.....................................16
      3.6 Additional Pull Details...............................18

      4. Directory Use Strategies and Push-Pull Hybrids.........19
      4.1 Strategy Configuration................................19

      5. Security Considerations................................22

      6. IANA Considerations....................................23
      6.1 ESADI-Parameter Data..................................23
      6.2 RBridge Channel Protocol Number.......................24
      6.3 Pull Directory and No Data Bits.......................24

      Acknowledgments...........................................25
      Normative References......................................25
      Informational References..................................26
      Authors' Addresses........................................27

L. Dunbar, et al                                                [Page 2]
INTERNET-DRAFT                        TRILL: Directory Assist Mechanisms

1. Introduction

   [DirectoryFramework] describes a high level framework for using
   directory servers to assist TRILL [RFC6325] edge nodes to reduce
   multi-destination ARP/ND and unknown unicast flooding traffic and to
   potentially improve security aginst address spoofing within a TRILL
   comapus.  Because multi-destination traffic becomes an increasing
   burden as a network scales, reducing ARP/ND and unknown unicast
   flooding improves TRILL network scalability. This document describes
   specific mechanisms for directory servers to assist TRILL edge nodes.
   These mechanims are optional to implement.

   The information held by the directories is address mapping
   information.  Most commonly, what MAC address [RFC5342bis]
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