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Coordinated Multicast Trees (CMT) for TRILL
draft-ietf-trill-cmt-03

Document type: Active Internet-Draft (trill WG)
Document stream: IETF
Last updated: 2014-04-01
Intended RFC status: Proposed Standard
Other versions: plain text, pdf, html

IETF State: WG Document
Consensus: Unknown
Document shepherd: Donald Eastlake

IESG State: I-D Exists
Responsible AD: (None)
Send notices to: No addresses provided

TRILL Working Group                                  Tissa Senevirathne
Internet Draft                                                    CISCO
Intended status: Standard Track                    Janardhanan Pathangi
Updates: 6325                                                      DELL
                                                             Jon Hudson
                                                                Brocade

                                                          April 1, 2014
Expires: October 2014

                Coordinated Multicast Trees (CMT) for TRILL
                        draft-ietf-trill-cmt-03.txt

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 1, 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

Senevirathne           Expires October 1, 2014                 [Page 1]
Internet-Draft  Coordinated Multicast Trees for TRILL        April 2014

   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.

Abstract

   TRILL facilitates loop free connectivity to non-TRILL legacy
   networks via choice of an Appointed Forwarder for a set of VLANs.
   Appointed Forwarder provides load sharing based on VLAN with an
   active-standby model. Mission critical operations such as High
   Performance Data Centers require active-active load sharing model.
   The Active-Active load sharing model can be accomplished by
   representing any given non-TRILL legacy network with a single
   virtual RBridge. Virtual representation of the non-TRILL legacy
   network with a single RBridge poses serious challenges in multi-
   destination RPF (Reverse Path Forwarding) check calculations. This
   document specifies required enhancements to build Coordinated
   Multicast Trees (CMT) within the TRILL campus to solve related RPF
   issues. CMT provides flexibility to RBridges in selecting desired
   path of association to a given TRILL multi-destination distribution
   tree.

Table of Contents

   1. Introduction...................................................3
      1.1. Scope and Applicability...................................5
      1.2. Contributors..............................................5
   2. Conventions used in this document..............................5
      2.1. Acronyms..................................................5
   3. The AFFINITY sub-TLV...........................................6
   4. Multicast Tree Construction and Use of Affinity Sub-TLV........6
      4.1. Update to RFC 6325........................................7
      4.2. Announcing virtual RBridge nickname.......................8
      4.3. Affinity Sub-TLV Capability...............................8
   5. Theory of operation............................................9
      5.1. Distribution Tree provisioning............................9
      5.2. Affinity Sub-TLV advertisement............................9
      5.3. Affinity sub-TLV conflict resolution......................9
      5.4. Ingress Multi-Destination Forwarding.....................10
         5.4.1. Forwarding when n < k...............................10
      5.5. Egress Multi-Destination Forwarding......................11
         5.5.1. Traffic Arriving on an assigned Tree to RBk-RBv.....11
         5.5.2. Traffic Arriving on other Trees.....................11
      5.6. Failure scenarios........................................11

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