TRILL: Resilient Distribution Trees

Document Type Expired Internet-Draft (individual)
Authors Mingui Zhang  , Tissa Senevirathne  , Janardhanan Pathangi  , Ayan Banerjee  , Anoop Ghanwani 
Last updated 2018-07-26 (latest revision 2018-01-22)
Replaces draft-zhang-trill-resilient-trees
Stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Expired & archived
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Stream WG state Submitted to IESG for Publication
Document shepherd Donald Eastlake
Shepherd write-up Show (last changed 2017-10-18)
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus Boilerplate Yes
Telechat date
Responsible AD Alia Atlas
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The TRILL (Transparent Interconnection of Lots of Links) protocol provides multicast data forwarding based on IS-IS link state routing. Distribution trees are computed based on the link state information through Shortest Path First calculation. When a link on the distribution tree fails, a campus-wide re-convergence of this distribution tree will take place, which can be time consuming and may cause considerable disruption to the ongoing multicast service. This document specifies how to build backup distribution trees to protect links on the primary distribution tree. Since the backup distribution tree is built up ahead of the link failure, when a link on the primary distribution tree fails, the pre-installed backup forwarding table will be utilized to deliver multicast packets without waiting for the campus-wide re-convergence. This minimizes the service disruption. This document updates RFC 6325.


Mingui Zhang (
Tissa Senevirathne (
Janardhanan Pathangi (
Ayan Banerjee (
Anoop Ghanwani (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)