Bit Indexed Explicit Replication (BIER) Problem Statement

Document Type Expired Internet-Draft (bier WG)
Last updated 2016-10-05 (latest revision 2016-04-03)
Replaces draft-shepherd-bier-problem-statement
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


There is a need to simplify network operations for multicast services. Current solutions require a tree-building control plane to build and maintain end-to-end tree state per flow, impacting router state capacity and network convergence times. Multi-point tree building protocols are often considered complex to deploy and debug and may include mechanics from legacy use-cases and/or assumptions which no longer apply to the current use-cases. When multicast services are transiting a provider network through an overlay, the core network has a choice to either aggregate customer state into a minimum set of core states resulting in flooding traffic to unwanted network end-points, or to map per-customer, per-flow tree state directly into the provider core state amplifying the network-wide state problem.


Greg Shepherd (
Andrew Dolganow (
Arkadiy Gulko (

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