Transparent Interconnection of Lots of Links (TRILL): ARP and Neighbor Discovery (ND) Optimization
RFC 8302

Document Type RFC - Proposed Standard (January 2018; No errata)
Last updated 2018-01-05
Replaces draft-yizhou-trill-arp-optimization, draft-trill-trill-arp-optimization
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IESG IESG state RFC 8302 (Proposed Standard)
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Internet Engineering Task Force (IETF)                             Y. Li
Request for Comments: 8302                               D. Eastlake 3rd
Category: Standards Track                                      L. Dunbar
ISSN: 2070-1721                                      Huawei Technologies
                                                              R. Perlman
                                                                Dell EMC
                                                                M. Umair
                                                                   Cisco
                                                            January 2018

         Transparent Interconnection of Lots of Links (TRILL):
              ARP and Neighbor Discovery (ND) Optimization

Abstract

   This document describes mechanisms to optimize the Address Resolution
   Protocol (ARP) and Neighbor Discovery (ND) traffic in a Transparent
   Interconnection of Lots of Links (TRILL) campus.  TRILL switches
   maintain a cache of IP / Media Access Control (MAC) address / Data
   Label bindings that are learned from ARP/ND requests and responses
   that pass through them.  In many cases, this cache allows an edge
   Routing Bridge (RBridge) to avoid flooding an ARP/ND request by
   either responding to it directly or encapsulating it and unicasting
   it.  Such optimization reduces packet flooding over a TRILL campus.

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
   https://www.rfc-editor.org/info/rfc8302.

Li, et al.                   Standards Track                    [Page 1]
RFC 8302                TRILL ARP/ND Optimization           January 2018

Copyright Notice

   Copyright (c) 2018 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
   (https://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.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  ARP/ND Optimization Requirement and Solution  . . . . . . . .   4
   3.  IP/MAC Address Mappings . . . . . . . . . . . . . . . . . . .   5
   4.  Handling ARP/ND/SEND Messages . . . . . . . . . . . . . . . .   6
     4.1.  SEND Considerations . . . . . . . . . . . . . . . . . . .   7
     4.2.  Address Verification  . . . . . . . . . . . . . . . . . .   7
     4.3.  Extracting Local Mapping Information for End-Station
           IP/MAC Addresses  . . . . . . . . . . . . . . . . . . . .   8
     4.4.  Determining How to Reply to ARP/ND  . . . . . . . . . . .   9
     4.5.  Determining How to Handle the ARP/ND Response . . . . . .  10
   5.  Handling of Reverse Address Resolution Protocol (RARP)
       Messages  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   6.  Handling of DHCP Messages . . . . . . . . . . . . . . . . . .  11
   7.  Handling of Duplicate IP Addresses  . . . . . . . . . . . . .  11
   8.  RBridge ARP/ND Cache Liveness and MAC Mobility  . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     9.1.  Data-Plane-Based Considerations . . . . . . . . . . . . .  13
     9.2.  Directory-Based Considerations  . . . . . . . . . . . . .  14
     9.3.  Use of the Confidence Level Feature . . . . . . . . . . .  14
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     11.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

Li, et al.                   Standards Track                    [Page 2]
RFC 8302                TRILL ARP/ND Optimization           January 2018

1.  Introduction

   ARP [RFC826] and ND [RFC4861] messages are normally sent by broadcast
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