Lecture 8 - Advanced PIM Sparse Mode Deep Dive Part 1

Опубликовано: 03 Май 2026
на канале: Decoding Packets
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This is the eighth video of a complete lecture series on IP Multicast and its implementation on both IOS and Junos routers with a focus on CCIE and JNCIE candidate requirements.

In this video we discuss the following topics:

PIM Sparse Mode(Protocol Independent Multicast Sparse-mode) neighbor discovery mechanism
How does PIM-SM (PIM Sparse Mode) use Hello messages to exchange TLV options
PIM-SM (Protocol Independent Multicast Sparse Mode) Hello message format and options important to CCIE and JNCIE candidates
How PIM-SM (PIM Sparse Mode) Designated Router (DR) election process
Why is DR (Designated Router) election important to PIM-SM (PIM Sparse Mode)
How do the RP and the LHRs signal (S,G) and (*,G) states (SPT, RPT) using PIM Join/Prune messages
In depth analysis of the PIM Join/Prune message
Structure of the PIM Join/Prune message
How does the RP signal the (S,G) (Shortest Path Tree or SPT) towards the FHR
The contents of the PIM Join message containing the (S, G) or SPT tree
How does the RP populate the various fields of the PIM Join/Prune message
How does the LHR signal the (*,G) (Rendezvous Point Tree or RPT) towards the Rendezvous Point (RP)
The contents of the PIM Join message containing the (*,G) or RPT signaling
How does the LHR populate the various fields of the PIM Join/Prune (*,G) message
What are the Wildcard (WC) and RPT bits and what is their meaning in a PIM (*,G) Join message
How does PIM leverage the same basic Join/Prune message in PIM Sparse Mode to signal both (S, G) and (*,G) trees
How do the Middle Hop Routers (MHRs) process the PIM Join/Prune messages)
The final state of the (S,G) tree on all the routers along with the identification of IIF (Incoming Interface) and the OIL (Outgoing Interface List)
The final state of the (*,G) tree on all the routers along with the identification of IIF (Incoming Interface) and the OIL (Outgoing Interface List)