TRILL Resilient Distribution Trees

Document Type Replaced Internet-Draft (trill WG)
Last updated 2013-11-13 (latest revision 2013-10-20)
Replaced by draft-ietf-trill-resilient-trees
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-trill-resilient-trees
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


TRILL protocol provides layer 2 multicast data forwarding using 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 recovergence of this distribution tree will take place, which can be time consuming and may cause considerable disruption to the ongoing multicast service. This document proposes to build the backup distribution tree 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 recovergence, which minimizes the service disruption.


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

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