This is the second 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 lecture, we discuss the following topics:

How IP mutlicast routers think about forwarding of IP multicast packets (away from a source vs. towards a destination) and how is it important for the CCIE and JNCIE
How an IP multicast router builds the multicast forwarding database
The concept of upstream vs downstream interfaces (IIF vs OIL) in the multicast FIB
Major responsibilities of a multicast routing protocol such as PIM, DVMRP etc.
How an IP multicast routing protocol populates the multicast routing table
How an IP multicast router uses the multicast FIB to forward packets in the data plane
(S,G) vs. (*,G) in IP multicast
What is a reverse path forwarding or RPF check
How an IP multicast router performs the RPF check to control multicast loops
How an IP multicast router uses the unicast routing table to perform RPF checks on multicast packets