RFC 9793
BGP Extensions for Bit Index Explicit Replication (BIER), June 2025
- File formats:

- Also available: XML file for editing
- Status:
- PROPOSED STANDARD
- Authors:
- X. Xu
M. Chen
K. Patel
IJ. Wijnands
T. Przygienda
Z. Zhang, Ed. - Stream:
- IETF
- Source:
- bier (rtg)
Cite this RFC: TXT | XML | BibTeX
DOI: https://doi.org/10.17487/RFC9793
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Abstract
Bit Index Explicit Replication (BIER) is a multicast forwarding architecture that doesn't require an explicit tree-building protocol and doesn't require intermediate routers to maintain per-tree multicast states. Some BIER-specific information and states, which are only in proportion to the number of BIER routers but not per-tree, do need to be advertised, calculated, and maintained. This document describes BGP extensions for advertising the BIER information and methods for calculating BIER states based on the advertisements.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.