Protection Methods for BIER-TE

Document Type Expired Internet-Draft (individual)
Authors Toerless Eckert  , Gregory Cauchie  , Wolfgang Braun  , Michael Menth 
Last updated 2018-09-06 (latest revision 2018-03-05)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document proposes protection methods for the BIER-TE architecture [I-D.ietf-bier-te-arch]. These include 1+1 (live-live) path/tree [RFC7431] redundancy, 1:1 path/tree protection, as well as fast reroute (FRR) methods. The latter may protect against link and/ or node failures and leverage infrastructure tunnels, BIER-in-BIER encapsulation, or header modification for implementation. In particular, this memo describes FRR for BIER-TE in detail. FRR for BIER-TE requires support from the BIER-TE controller and the BFRs that are attached to a link/adjacency for which FRR protection is desired. FRR relies on the BIER header described in [RFC8279] which is also used by BIER-TE. It does not require extensions or modifications to existing BIER-TE tables. However, the presented FRR procedures need some additional forwarding plane logic on the BFR. An additional table is needed that carries information about pre- computed backup paths. When a failure is detected, the information from this table is used to modify the bitstring in the BIER header before forwarding a packet over a backup path. To prevent undesired packet duplication, packets should be tunneled on the backup paths.


Toerless Eckert (
Gregory Cauchie (
Wolfgang Braun (
Michael Menth (

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