Appletalk Update-Based Routing Protocol: Enhanced Appletalk Routing
RFC 1504

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Network Working Group                                     A. Oppenheimer
Request for Comments: 1504                                Apple Computer
                                                             August 1993

                Appletalk Update-Based Routing Protocol:
                       Enhanced Appletalk Routing

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is
   unlimited.

Introduction

   This memo is being distributed to members of the Internet community
   to fully document an Apple protocol that may be running over the
   Internet.  While the issues discussed may not be directly relevant to
   the research problems of the Internet, they may be interesting to a
   number of researchers and implementers.

About This Document

   This document provides detailed information about the AppleTalk
   Update-based Routing Protocol (AURP) and wide area routing. AURP
   provides wide area routing enhancements to the AppleTalk routing
   protocols and is fully compatible with AppleTalk Phase 2. The
   organization of this document has as its basis the three major
   components of AURP:

      AppleTalk tunneling, which allows AppleTalk data to pass through
      foreign networks and over point-to-point links

      the propagation of AppleTalk routing information between internet
      routers connected through foreign networks or over point-to-point
      links

      the presentation of AppleTalk network information by an internet
      router to nodes and other Phase 2-compatible routers on its local
      internet

What This Document Contains

   The chapters of this document contain the following information:

      Chapter 1, "Introduction to the AppleTalk Update-Based Routing
      Protocol," introduces the three major components of AURP and the

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RFC 1504        Appletalk Update-Based Routing Protocol      August 1993

      key wide area routing enhancements that AURP provides to the
      AppleTalk routing protocols.

      Chapter 2, "Wide Area AppleTalk Connectivity," provides
      information about AppleTalk tunneling through IP internets and over
      point-to-point links.

      Chapter 3, "Propagating Routing Information With the AppleTalk
      Update-Based Routing Protocol," describes the essential elements of
      AURP, including the architectural model for update-based routing.
      This chapter provides detailed information about the methods that
      AURP uses to propagate routing information between internet routers
      connected through tunnels.

      Chapter 4, "Representing Wide Area Network Information," describes
      optional features of AURP-some of which can also be implemented on
      routers that use RTMP rather than AURP for routing-information
      propagation. It gives detailed information about how an exterior
      router represents imported network information to its local
      internet and to other exterior routers. It describes network
      hiding, device hiding, network-number remapping, clustering, loop
      detection, hop-count reduction, hop-count weighting, and backup
      paths.

      The Appendix, "Implementation Details," provides information about
      implementing AURP.

What You Need to Know

   This document is intended for developers of AppleTalk wide area
   routing products. It assumes familiarity with the AppleTalk network
   system, internet routing, and wide area networking terms and
   concepts.

Format of This RFC Document

   The text of this document has been quickly prepared for RFC format.
   However, the art is more complex and is not yet ready in this format.
   We plan to incorporate the art in the future. Consult the official
   APDA document, as indicated below, for the actual art.

For More Information

   The following manuals and books from Apple Computer provide
   additional information about AppleTalk networks. You can obtain books
   published by Addison-Wesley at your local bookstore. Contact APDA,
   Apple's source for developer tools, to obtain technical reference
   materials for developers:

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RFC 1504        Appletalk Update-Based Routing Protocol      August 1993

      APDA
      Apple Computer, Inc.
      20525 Mariani Avenue, M/S 33-G
      Cupertino, CA  95014-6299

   These manuals provide information about some AppleTalk network
   products:

      The Apple Ethernet NB User's Guide explains how to install and use
      an Apple Ethernet NB Card and EtherTalk software on an AppleTalk
      network.

      The Apple InteroPoll Network Administrator's Guide describes how
      to perform maintenance and troubleshooting on an AppleTalk network
      using InteroPoll, a network administrator's utility program.

      The Apple Internet Router Administrator's Guide explains how to