Lecture 9 - Advanced PIM Sparse Mode Deep Dive Part 2
This is the ninth 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:
How an FHR communicates to the Rendezvous Point about an active (S,G) multicast source
The PIM (Protocol Independent Message) Registration process
The contents of the PIM Register message
The concept of the PIM Null-Register message in PIM Sparse Mode
The contents of the PIM Null-Register message in PIM Sparse Mode
The concept of the PIM Register-Stop message in PIM Sparse Mode
The contents of the PIM Register-Stop message in PIM Sparse Mode
PIM Register message packet format deep dive
PIM Register tunnel concept in PIM Sparse Mode
How the PIM Register Tunnel is a Multipoint-to-Point tunnel in PIM Sparse Mode
How the Rendezvous Point (RP) react to the receipt of a PIM Register Message in PIM Sparse Mode
The three possible state an RP can be in:
-- RP with no (*,G) state for a group being registered by the PIM Register Message
-- RP with an active (*,G) state but no (S,G) for a group being registered by the PIM Register message
-- RP with an active (*,G) state and an active (S,G) state receiving a Null-Register message and responding with a Register-Stop message
How an RP uses the (S,G) information in a PIM Register message to start building an (S,G) (Shortest Path Tree or SPT) towards the First Hop Router (FHR)