Transparent Interconnection of Lots of Links (TRILL): Interface Addresses APPsub-TLV
RFC 7961

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Internet Engineering Task Force (IETF)                   D. Eastlake 3rd
Request for Comments: 7961                                         Y. Li
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                              August 2016

         Transparent Interconnection of Lots of Links (TRILL):
                     Interface Addresses APPsub-TLV

Abstract

   This document specifies a TRILL (Transparent Interconnection of Lots
   of Links) IS-IS application sub-TLV that enables the reporting by a
   TRILL switch of sets of addresses.  Each set of addresses reports all
   of the addresses that designate the same interface (port) and also
   reports the TRILL switch by which that interface is reachable.  For
   example, a 48-bit MAC (Media Access Control) address, IPv4 address,
   and IPv6 address can be reported as all corresponding to the same
   interface reachable by a particular TRILL switch.  Such information
   could be used in some cases to synthesize responses to, or bypass the
   need for, the Address Resolution Protocol (ARP), the IPv6 Neighbor
   Discovery (ND) protocol, or the flooding of unknown MAC addresses.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   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/rfc7961.

Eastlake & Li                Standards Track                    [Page 1]
RFC 7961                  TRILL: IA APPsub-TLV               August 2016

Copyright Notice

   Copyright (c) 2016 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
      1.1. Conventions Used in This Document ..........................3
   2. Format of the Interface Addresses APPsub-TLV ....................4
   3. IA APPsub-TLV Sub-sub-TLVs ......................................9
      3.1. AFN Size Sub-sub-TLV ......................................10
      3.2. Fixed Address Sub-sub-TLV .................................11
      3.3. Data Label Sub-sub-TLV ....................................12
      3.4. Topology Sub-sub-TLV ......................................12
   4. Security Considerations ........................................13
   5. IANA Considerations ............................................14
      5.1. Allocation of AFN Values ..................................14
      5.2. IA APPsub-TLV Sub-sub-TLVs Sub-registry ...................15
      5.3. IA APPsub-TLV Number ......................................16
   6. Additional AFN Information .....................................16
   7. Processing Address Sets ........................................16
   8. References .....................................................18
      8.1. Normative References ......................................18
      8.2. Informative References ....................................20
   Appendix A. Examples ..............................................21
      A.1. Simple Example ............................................21
      A.2. Complex Example ...........................................22
   Acknowledgments ...................................................24
   Authors' Addresses ................................................24

Eastlake & Li                Standards Track                    [Page 2]
RFC 7961                  TRILL: IA APPsub-TLV               August 2016

1.  Introduction

   This document specifies a TRILL (Transparent Interconnection of Lots
   of Links) [RFC6325] IS-IS application sub-TLV (APPsub-TLV) [RFC6823]
   that enables the convenient representation of sets of addresses where
   all of the addresses in each set designate the same interface (port).
   For example, a 48-bit MAC (Media Access Control) [RFC7042] address,
   IPv4 address, and IPv6 address can be reported as all three
   designating the same interface.  In addition, a Data Label (VLAN or