BIER Use Cases

Document Type Expired Internet-Draft (bier WG)
Authors Nagendra Nainar  , Rajiv Asati  , Mach Chen  , Xiaohu Xu  , Andrew Dolganow  , Tony Przygienda  , Arkadiy Gulko  , Dom Robinson  , Vishal Arya  , Caitlin Bestler 
Last updated 2021-03-14 (latest revision 2020-09-10)
Replaces draft-kumar-bier-use-cases
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Consensus: Waiting for Write-Up
Other - see Comment Log
Document shepherd Suneesh Babu
Shepherd write-up Show (last changed 2020-08-30)
IESG IESG state Expired
Consensus Boilerplate Unknown
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Send notices to Suneesh Babu <>

This Internet-Draft is no longer active.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 Nainar (
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.)