RFC 8279

Multicast Using Bit Index Explicit Replication (BIER), November 2017

Canonical URL:
https://www.rfc-editor.org/rfc/rfc8279.txt
File formats:
Plain TextPDF
Status:
PROPOSED STANDARD (changed from EXPERIMENTAL May 2018)
Authors:
IJ. Wijnands, Ed.
E. Rosen, Ed.
A. Dolganow
T. Przygienda
S. Aldrin
Stream:
IETF
Source:
bier (rtg)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC8279

Discuss this RFC: Send questions or comments to bier@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

This document specifies a new architecture for the forwarding of multicast data packets. It provides optimal forwarding of multicast packets through a "multicast domain". However, it does not require a protocol for explicitly building multicast distribution trees, nor does it require intermediate nodes to maintain any per-flow state. This architecture is known as "Bit Index Explicit Replication" (BIER). When a multicast data packet enters the domain, the ingress router determines the set of egress routers to which the packet needs to be sent. The ingress router then encapsulates the packet in a BIER header. The BIER header contains a bit string in which each bit represents exactly one egress router in the domain; to forward the packet to a given set of egress routers, the bits corresponding to those routers are set in the BIER header. The procedures for forwarding a packet based on its BIER header are specified in this document. Elimination of the per-flow state and the explicit tree-building protocols results in a considerable simplification.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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