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Fibre Channel over Ethernet (FCoE) over Transparent Interconnection of Lots of Links (TRILL)
RFC 6847

Independent Submission                                         D. Melman
Request for Comments: 6847                                    T. Mizrahi
Category: Informational                                          Marvell
ISSN: 2070-1721                                          D. Eastlake 3rd
                                                                  Huawei
                                                            January 2013

                Fibre Channel over Ethernet (FCoE) over
          Transparent Interconnection of Lots of Links (TRILL)

Abstract

   Fibre Channel over Ethernet (FCoE) and Transparent Interconnection of
   Lots of Links (TRILL) are two emerging standards in the data center
   environment.  While these two protocols are seemingly unrelated, they
   have a very similar behavior in the forwarding plane, as both perform
   hop-by-hop forwarding over Ethernet, modifying the packet's Media
   Access Control (MAC) addresses at each hop.  This document describes
   an architecture for the integrated deployment of these two protocols.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   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/rfc6847.

Copyright Notice

   Copyright (c) 2013 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.

Melman, et al.                Informational                     [Page 1]
RFC 6847                     FCoE over TRILL                January 2013

Table of Contents

   1. Introduction ................................................. 2
   2. Abbreviations ................................................ 3
   3. FCoE over TRILL .............................................. 4
      3.1. FCoE over a TRILL Cloud ................................. 4
      3.2. FCoE over an RBridge .................................... 5
         3.2.1. FCRB ............................................... 5
         3.2.2. Topology ........................................... 7
         3.2.3. The FCRB Flow .....................................  8
            3.2.3.1. Example - ENode to ENode .....................  8
               3.2.3.1.1. Forwarding from A to C in Dense Mode ....  9
               3.2.3.1.2. Forwarding from A to C in Sparse Mode ...  9
            3.2.3.2. Example - ENode to Native FC Node ............ 10
            3.2.3.3. Example - ENode to ENode with Non-FCRB EoR ... 10
            3.2.3.4. Example - FCoE Control Traffic through an FCRB 11
   4. Security Considerations ..................................... 12
   5. Acknowledgments ............................................. 12
   6. References .................................................. 12
      6.1. Normative References ................................... 12
      6.2. Informative References ................................. 12

1.  Introduction

   Data center networks are rapidly evolving towards a consolidated
   approach, in which Ethernet is used as the common infrastructure for
   all types of traffic.  Storage traffic was traditionally dominated by
   the Fibre Channel (FC) protocol suite.  At the intersection between
   these two technologies a new technology was born, Fibre Channel over
   Ethernet (FCoE), in which native FC packets are encapsulated with an
   FCoE encapsulation over an Ethernet header.  FCoE is specified in
   [FC-BB-5].  (A future version of FCoE is under development and is
   expected to be specified in a document to be referred to as FC-BB-6;
   however, this is a work in progress and is beyond the scope of this
   document.)

   Traffic between two FCoE end nodes (ENodes) is forwarded through one
   or more FCoE Forwarders (FCFs).  An FCF takes a forwarding decision
   based on the Fibre Channel destination ID (D_ID), and enforces
   security policies between ENodes, also known as zoning.  Once an FCF
   takes a forwarding decision, it modifies the source and destination

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