Transparent Interconnection of Lots of Links (TRILL) Active-Active Edge Using Multiple MAC Attachments
RFC 7782

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01
• 02
• 03
• 04
• 05
• 06

Internet Engineering Task Force (IETF)                          M. Zhang
Request for Comments: 7782                                        Huawei
Category: Standards Track                                     R. Perlman
ISSN: 2070-1721                                                      EMC
                                                                 H. Zhai
                                                       Astute Technology
                                                              M. Durrani
                                                           Cisco Systems
                                                                S. Gupta
                                                             IP Infusion
                                                           February 2016

          Transparent Interconnection of Lots of Links (TRILL)
           Active-Active Edge Using Multiple MAC Attachments

Abstract

   TRILL (Transparent Interconnection of Lots of Links) active-active
   service provides end stations with flow-level load balance and
   resilience against link failures at the edge of TRILL campuses, as
   described in RFC 7379.

   This document specifies a method by which member RBridges (also
   referred to as Routing Bridges or TRILL switches) in an active-active
   edge RBridge group use their own nicknames as ingress RBridge
   nicknames to encapsulate frames from attached end systems.  Thus,
   remote edge RBridges (who are not in the group) will see one host
   Media Access Control (MAC) address being associated with the multiple
   RBridges in the group.  Such remote edge RBridges are required to
   maintain all those associations (i.e., MAC attachments) and to not
   flip-flop among them (as would occur prior to the implementation of
   this specification).  The design goals of this specification are
   discussed herein.

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 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/rfc7782.

Zhang, et al.                Standards Track                    [Page 1]
RFC 7782           Multi-Attach for Active-Active Edge     February 2016

Copyright Notice

   Copyright (c) 2016 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
   2. Acronyms and Terminology ........................................4
   3. Overview ........................................................5
   4. Incremental Deployable Options ..................................6
      4.1. Details of Option B ........................................7
           4.1.1. Advertising Data Labels for Active-Active Edge ......7
           4.1.2. Discovery of Active-Active Edge Members .............8
           4.1.3. Advertising Learned MAC Addresses ...................9
      4.2. Extended RBridge Capability Flags APPsub-TLV ..............11
   5. Meeting the Design Goals .......................................12
      5.1. No MAC Address Flip-Flopping (Normal Unicast Egress) ......12
      5.2. Regular Unicast/Multicast Ingress .........................12
      5.3. Correct Multicast Egress ..................................12
           5.3.1. No Duplication (Single Exit Point) .................12
           5.3.2. No Echo (Split Horizon) ............................13
      5.4. No Black-Hole or Triangular Forwarding ....................14
      5.5. Load Balance towards the AAE ..............................14
      5.6. Scalability ...............................................14
   6. E-L1FS Backward Compatibility ..................................15
   7. Security Considerations ........................................15
   8. IANA Considerations ............................................16
      8.1. TRILL APPsub-TLVs .........................................16
      8.2. Extended RBridge Capabilities Registry ....................16