Verifying IPv4 Multicast Forwarding Using the MFIB

This guide outlines the process of verifying IPv4 multicast forwarding using the Multicast Forwarding Information Base (MFIB) in various multicast network modes, including Protocol Independent Multicast sparse mode (PIM-SM), Source Specific Multicast (PIM-SSM), and bidirectional PIM (bidir-PIM). It details the prerequisites necessary for verification, such as familiarity with related multicast concepts and ensuring that IP multicast is enabled. The guide also specifies restrictions that must be adhered to, including the requirement for a compatible software image. The document presents guidelines for conducting the verification process, starting from the last-hop designated router and progressing through the routers along the shortest path tree. Additionally, it includes common commands utilized during verification, along with explanations of various flags observed in the output of these commands, which assist in confirming proper multicast traffic forwarding through the network.