Coordinated Multicast Trees (CMT)for TRILL
draft-tissa-trill-cmt-00

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Last updated 2012-01-05
Replaced by draft-ietf-trill-cmt, rfc7783
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TRILL Working Group                                  Tissa Senevirathne
Internet Draft                                                    CISCO
Intended status: Standard Track                    Janardhanan Pathangi
                                                                   DELL
                                                             Jon Hudson
                                                                Brocade

                                                        January 5, 2012
Expires: July 2012

                Coordinated Multicast Trees (CMT)for TRILL
                       draft-tissa-trill-cmt-00.txt

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   carefully, as they describe your rights and restrictions with
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Abstract

   TRILL facilitates loop free connectivity to non TRILL legacy
   networks via choice of an Appointed Forwarder for set of VLANs.
   Appointed Forwarder provides VLAN level load sharing with active-
   standby model. Mission critical operations such as High Performance
   Data Centers require active-active load sharing model. 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 calculations. This
   document presents the required enhancements to build Coordinated
   Multicast Trees (CMT) within the TRILL campus. CMT provides
   flexibility to RBridges to select desired path of association to a
   given distribution tree.

Table of Contents

   1. Introduction...................................................3
      1.1. Contributors..............................................4
   2. Conventions used in this document..............................5
   3. IS-IS extension................................................5
      3.1. AFFINITY TLV..............................................5
   4. Multicast Tree Construction and use of Affinity Sub-TLV........7
      4.1. Update to RFC 6325........................................8
      4.2. Announcing virtual RBridge nickname.......................9
      4.3. Affinity Sub-TLV capability...............................9
   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.....................10
      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
         5.6.1. Edge RBridge RBk failure............................11
      5.7. Backward compatibility...................................12
   6. Security Considerations.......................................12
   7. IANA Considerations...........................................13
   8. References....................................................13
      8.1. Normative References.....................................13

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