Transparent Interconnection of Lots of Links (TRILL) Smart Endnodes
RFC 8384

Document Type RFC - Proposed Standard (July 2018; No errata)
Last updated 2018-07-11
Replaces draft-perlman-trill-smart-endnodes
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Internet Engineering Task Force (IETF)                        R. Perlman
Request for Comments: 8384                                      Dell EMC
Category: Standards Track                                          F. Hu
ISSN: 2070-1721                                          ZTE Corporation
                                                         D. Eastlake 3rd
                                                                 T. Liao
                                                     Huawei Technologies
                                                               July 2018

  Transparent Interconnection of Lots of Links (TRILL) Smart Endnodes

Abstract

   This document addresses the problem of the size and freshness of the
   endnode learning table in edge Routing Bridges (RBridges), by
   allowing endnodes to volunteer for endnode learning and
   encapsulation/decapsulation.  Such an endnode is known as a "Smart
   Endnode".  Only the attached edge RBridge can distinguish a "Smart
   Endnode" from a "normal endnode".  The Smart Endnode uses the
   nickname of the attached edge RBridge, so this solution does not
   consume extra nicknames.  The solution also enables endnodes that are
   Fine-Grained Label (FGL) aware.

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/rfc8384.

Perlman, et al.              Standards Track                    [Page 1]
RFC 8384                  TRILL Smart Endnodes                 July 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
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   3.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Smart-Hello Mechanism between Smart Endnode and RBridge . . .   6
     4.1.  Smart-Hello Encapsulation . . . . . . . . . . . . . . . .   6
     4.2.  Edge RBridge's Smart-Hello  . . . . . . . . . . . . . . .   8
     4.3.  Smart Endnode's Smart-Hello . . . . . . . . . . . . . . .   8
   5.  Processing Data Packets . . . . . . . . . . . . . . . . . . .  10
     5.1.  Data-Packet Processing for Smart Endnodes . . . . . . . .  10
     5.2.  Data-Packet Processing for Edge RBridge . . . . . . . . .  11
   6.  Multihoming Scenario  . . . . . . . . . . . . . . . . . . . .  12
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

Perlman, et al.              Standards Track                    [Page 2]
RFC 8384                  TRILL Smart Endnodes                 July 2018

1.  Introduction

   The IETF TRILL (Transparent Interconnection of Lots of Links)
   protocol [RFC6325] [RFC7780] provides optimal pair-wise data frame
   forwarding without configuration, safe forwarding even during periods
   of temporary loops, and support for multipathing of both unicast and
   multicast traffic.  TRILL accomplishes this by using IS-IS [IS-IS]
   [RFC7176] link state routing and encapsulating traffic using a header
   that includes a hop count.  Devices that implement TRILL are called
   "RBridges" (Routing Bridges) or "TRILL Switches".

   An RBridge that attaches to endnodes is called an "edge RBridge" or
   "edge TRILL Switch", whereas one that exclusively forwards
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