Problem Statement and Goals for Active-Active Connection at the Transparent Interconnection of Lots of Links (TRILL) Edge
RFC 7379

Document Type RFC - Informational (October 2014; No errata)
Last updated 2015-10-14
Replaces draft-yizhou-trill-active-active-connection-prob
Stream IETF
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Document shepherd Donald Eastlake
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IESG IESG state RFC 7379 (Informational)
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Internet Engineering Task Force (IETF)                             Y. Li
Request for Comments: 7379                                        W. Hao
Category: Informational                              Huawei Technologies
ISSN: 2070-1721                                               R. Perlman
                                                                     EMC
                                                               J. Hudson
                                                                 Brocade
                                                                 H. Zhai
                                                                     JIT
                                                            October 2014

    Problem Statement and Goals for Active-Active Connection at the
       Transparent Interconnection of Lots of Links (TRILL) Edge

Abstract

   The IETF TRILL (Transparent Interconnection of Lots of Links)
   protocol provides support for flow-level multipathing with rapid
   failover for both unicast and multi-destination traffic in networks
   with arbitrary topology.  Active-active connection at the TRILL edge
   is the extension of these characteristics to end stations that are
   multiply connected to a TRILL campus.  This informational document
   discusses the high-level problems and goals when providing active-
   active connection at the TRILL edge.

Status of This Memo

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

   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).  Not all documents
   approved by the IESG are 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/rfc7379.

Li, et al.                    Informational                     [Page 1]
RFC 7379          Problems of Active-Active Connection      October 2014

Copyright Notice

   Copyright (c) 2014 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. Terminology ................................................3
   2. Target Scenario .................................................4
      2.1. LAALP and Edge Group Characteristics .......................6
   3. Problems in Active-Active Connection at the TRILL Edge ..........7
      3.1. Frame Duplications .........................................7
      3.2. Loopback ...................................................8
      3.3. Address Flip-Flop ..........................................8
      3.4. Unsynchronized Information among Member RBridges ...........8
   4. High-Level Requirements and Goals for Solutions .................9
   5. Security Considerations ........................................10
   6. References .....................................................11
      6.1. Normative References ......................................11
      6.2. Informative References ....................................12
   Acknowledgments ...................................................12
   Authors' Addresses ................................................13

Li, et al.                    Informational                     [Page 2]
RFC 7379          Problems of Active-Active Connection      October 2014

1.  Introduction

   The IETF TRILL (Transparent Interconnection of Lots of Links)
   [RFC6325] protocol provides loop-free and per-hop-based multipath
   data forwarding with minimum configuration.  TRILL uses IS-IS [IS-IS]
   [RFC6165] [RFC7176] as its control-plane routing protocol and defines
   a TRILL-specific header for user data.  In a TRILL campus,
   communications between TRILL switches can:

   1) use multiple parallel links and/or paths,

   2) spread load over different links and/or paths at a fine-grained
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