PIM-SM Session Establishment with RP

Protocol Independent Multicast — Sparse Mode · RFC 7761 · Step-by-step process

Idle

IGMP Join

(*,G) Join

Register

Shared tree

SPT switch

Prune

🔥

FHR / DR

First Hop Router

Idle

💻

Source

PIM Register

unicast encap (S,G)

Register-Stop

RP: stop encapsulation

(S,G) Join

RP builds SPT toward source

Multicast data

native mcast → RP

SPT data

shortest path

(S,G) Join →FHR

LHR builds SPT

🌐

RP

Rendezvous Point

Idle

(*,G) Join

LHR → RP shared tree

Multicast data

RP → LHR (shared tree)

(S,G,rpt) Prune

leave shared tree

📡

LHR / DR

Last Hop Router

Idle

📺

Receiver

Start

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