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Coordinated Multicast Trees (CMT) for Transparent Interconnection of Lots of Links (TRILL) (RFC7783) Disclosure Number: IPCOM000245296D
Original Publication Date: 2016-Feb-01
Included in the Prior Art Database: 2016-Feb-26
Document File: 32 page(s) / 37K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

T. Senevirathne: AUTHOR [+2]


TRILL (Transparent Interconnection of Lots of Links), as presented in [RFC6325] and other related documents, provides methods of utilizing all available paths for active forwarding, with minimum configuration. TRILL utilizes IS-IS (Intermediate System to Intermediate System) [IS-IS] as its control plane and uses a TRILL Header that includes a Hop Count.

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Internet Engineering Task Force (IETF)                   T. Senevirathne Request for Comments: 7783                                    Consultant Updates: 6325                                                J. Pathangi Category: Standards Track                                           Dell ISSN: 2070-1721                                                J. Hudson                                                                  Brocade                                                            February 2016

                    Coordinated Multicast Trees (CMT)         for Transparent Interconnection of Lots of Links (TRILL)


   TRILL (Transparent Interconnection of Lots of Links) facilitates

   loop-free connectivity to non-TRILL networks via a choice of an

   Appointed Forwarder for a set of VLANs.  Appointed Forwarders provide

   VLAN-based load sharing with an active-standby model.  High-

   performance applications require an active-active load-sharing model.

   The active-active load-sharing model can be accomplished by

   representing any given non-TRILL network with a single virtual

   RBridge (also referred to as a virtual Routing Bridge or virtual

   TRILL switch).  Virtual representation of the non-TRILL 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,

   which only requires a software upgrade, provides flexibility to

   RBridges in selecting a desired path of association to a given TRILL

   multi-destination distribution tree.  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 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Senevirathne, et al.         Standards Track                    [Page 1]
 RFC 7783          Coordinated Multicast Trees for TRILL    February 2016

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