BIER Use Cases

The information below is for an old version of the document
Document Type Expired Internet-Draft (bier WG)
Last updated 2017-07-17 (latest revision 2017-01-08)
Replaces draft-kumar-bier-use-cases
Stream IETF
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Expired & archived
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Stream WG state WG Document (wg milestones: Mar 2018 - Shepherd/IESG queue:..., Jul 2018 - Publish as proposed ... )
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Bit Index Explicit Replication (BIER) is an architecture that provides optimal multicast forwarding through a "BIER domain" without requiring intermediate routers to maintain any multicast related per- flow state. BIER also does not require any explicit tree-building protocol for its operation. A multicast data packet enters a BIER domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs). The BFIR router adds a BIER header to the packet. The BIER header contains a bit-string in which each bit represents exactly one BFER to forward the packet to. The set of BFERs to which the multicast packet needs to be forwarded is expressed by setting the bits that correspond to those routers in the BIER header. This document describes some of the use-cases for BIER.


Nagendra Kumar (
Rajiv Asati (
Mach Chen (
Xiaohu Xu (
Andrew Dolganow (
Tony Przygienda (
Arkadiy Gulko (
Dom Robinson (
Vishal Arya (
Caitlin Bestler (

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