@misc{rfc9793, series = {Request for Comments}, number = 9793, howpublished = {RFC 9793}, publisher = {RFC Editor}, doi = {10.17487/RFC9793}, url = {https://www.rfc-editor.org/info/rfc9793}, author = {Xiaohu Xu and Mach Chen and Keyur Patel and IJsbrand Wijnands and Tony Przygienda and Zhaohui (Jeffrey) Zhang}, title = {{BGP Extensions for Bit Index Explicit Replication (BIER)}}, pagetotal = 12, year = 2025, month = jun, 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.}, }