Protocol Independent Multicast - Sparse Mode : Protocol Specification
RFC 7761, “Protocol Independent Multicast - Sparse Mode : Protocol Specification”, is an Internet Standard document published in March 2016 by B. Fenner, M. Handley, H. Holbrook, I. Kouvelas, R. Parekh, Z. Zhang, L. Zheng. It obsoletes RFC 4601. It has since been updated by RFC 8736, RFC 9436. The canonical text is published by the RFC Editor.
Abstract
This document specifies Protocol Independent Multicast - Sparse Mode (PIM-SM). PIM-SM is a multicast routing protocol that can use the underlying unicast routing information base or a separate multicast-capable routing information base. It builds unidirectional shared trees rooted at a Rendezvous Point (RP) per group, and it optionally creates shortest-path trees per source.
This document obsoletes RFC 4601 by replacing it, addresses the errata filed against it, removes the optional (*,*,RP), PIM Multicast Border Router features and authentication using IPsec that lack sufficient deployment experience (see Appendix A), and moves the PIM specification to Internet Standard.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 7761 is hosted at rfc-editor.org. Available in TXT,HTML.
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