Transparent Interconnection of Lots of Links (TRILL): Centralized Replication for Active-Active Broadcast, Unknown Unicast, and Multicast (BUM) Traffic
RFC 8361

Document Type RFC - Proposed Standard (April 2018; No errata)
Updates RFC 6325
Last updated 2018-04-12
Replaces draft-hao-trill-centralized-replication
Stream IETF
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Stream WG state Submitted to IESG for Publication (wg milestone: Dec 2014 - Submit Active-Active... )
Document shepherd Donald Eastlake
Shepherd write-up Show (last changed 2017-11-11)
IESG IESG state RFC 8361 (Proposed Standard)
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Responsible AD Alia Atlas
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Internet Engineering Task Force (IETF)                            W. Hao
Request for Comments: 8361                                         Y. Li
Updates: 6325                                        Huawei Technologies
Category: Standards Track                                     M. Durrani
ISSN: 2070-1721                                                  Equinix
                                                                S. Gupta
                                                             IP Infusion
                                                                   A. Qu
                                                                MediaTec
                                                              April 2018

         Transparent Interconnection of Lots of Links (TRILL):
               Centralized Replication for Active-Active
        Broadcast, Unknown Unicast, and Multicast (BUM) Traffic

Abstract

   In Transparent Interconnection of Lots of Links (TRILL) active-active
   access, a Reverse Path Forwarding (RPF) check failure issue may occur
   when using the pseudo-nickname mechanism specified in RFC 7781.  This
   document describes a solution to resolve this RPF check failure issue
   through centralized replication.  All ingress Routing Bridges
   (RBridges) send Broadcast, Unknown Unicast, and Multicast (BUM)
   traffic to a centralized node with unicast TRILL encapsulation.  When
   the centralized node receives the BUM traffic, it decapsulates the
   packets and forwards them to their destination RBridges using a
   distribution tree established per the TRILL base protocol (RFC 6325).
   To avoid RPF check failure on an RBridge sitting between the ingress
   RBridge and the centralized replication node, some change in the RPF
   calculation algorithm is required.  RPF checks on each RBridge MUST
   be calculated as if the centralized node was the ingress RBridge,
   instead of being calculated using the actual ingress RBridge.  This
   document updates RFC 6325.

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/rfc8361.

Hao, et al.                  Standards Track                    [Page 1]
RFC 8361         Centralized Replication for BUM Traffic      April 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 ....................................................2
   2. Conventions Used in This Document ...............................3
   3. Centralized Replication Solution Overview .......................4
   4. Frame Duplication from Remote RBridge ...........................6
   5. Local Forwarding Behavior on Ingress RBridge ....................6
   6. Loop Prevention among RBridges in an Edge Group .................8
   7. Centralized Replication Forwarding Process ......................9
   8. BUM Traffic Load-Balancing among Multiple Centralized Nodes ....10
   9. Coexisting with the CMT Solution (RFC 7783) ....................11
   10. Network Upgrade Analysis ......................................12
   11. TRILL Protocol Extensions .....................................13
      11.1. "R" and "C" Flag in the Nickname Flags APPsub-TLV ........13
   12. Security Considerations .......................................14
   13. IANA Considerations ...........................................14
   14. References ....................................................15
      14.1. Normative References .....................................15
      14.2. Informative References ...................................16
   Acknowledgments ...................................................17
   Authors' Addresses ................................................17

1.  Introduction

   The IETF TRILL protocol [RFC6325] provides multipath data forwarding
   that is loop free and per-hop based with minimum configuration.
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