Technical Summary
The Protocol Independent Multicast (PIM) Flooding Mechanism (PFM)
provides a generic hop-by-hop message exchange framework for
distributing multicast information among PIM routers. Existing PFM
procedures enable efficient source discovery without reliance on
Rendezvous Points, shared trees, or initial data registers.
This document specifies enhancements to PFM forwarding behavior to
improve efficiency and scalability. In particular, it introduces
mechanisms to reduce redundant message transmission over multiple
parallel links and extends the encoding of multicast information
through additional Type-Length-Value (TLV) structures and sub-TLVs to
convey richer flow-related data. These enhancements optimize
control-plane overhead while preserving interoperability with
existing PFM procedures, enabling more efficient dissemination of
multicast state in PIM networks.
Working Group Summary
Was there anything in the WG process that is worth noting?
For example, was there controversy about particular points
or were there decisions where the consensus was
particularly rough?
Document Quality
Are there existing implementations of the protocol? Have a
significant number of vendors indicated their plan to
implement the specification? Are there any reviewers that
merit special mention as having done a thorough review,
e.g., one that resulted in important changes or a
conclusion that the document had no substantive issues? If
there was a MIB Doctor, Media Type, or other Expert Review,
what was its course (briefly)? In the case of a Media Type
Review, on what date was the request posted?
Personnel
The Document Shepherd for this document is Mike McBride. The Responsible
Area Director is Gunter Van de Velde.
IANA Note
(Insert IANA Note here or remove section)