Multicasting on the Internet and its Applications

35 5 Multicast Extensions to Open Shortest Path First (MO- SPF) 39 5.1 High-level Description 39 Architecture ...... 6 Protocol Independent Multicast (PIM) 53 6.1 High-Level Description 53 54 6.2 Architecture . 57 6.3.1 Creating the PIM framework 58 6.3.2 Creating a specific multicast tree for a group 59 6.3.3 Multicast data forwarding .