You work for a financial institution that is planning to deploy a new multicast application in your network to do real-time trading. This application will be run simultaneously by thousands of…

PIM Any-Source Multicast (ASM/PIM-SM) can switch from the shared (*,G) tree to a per-source (S,G) shortest-path tree, creating thousands of (S,G) state entries on routers when thousands of active sources are present.

PIM Dense Mode floods multicast traffic throughout the entire network and then uses prune messages to stop unwanted flows; with thousands of sources this produces a massive flood-and-prune storm that severely burdens all routers.

PIM Source Specific Multicast (SSM) always uses source-specific (S,G) trees and requires receivers to know each source address in advance, which is impractical with thousands of dynamic sources and creates per-source state for each one.

Bidir-PIM builds a single bidirectional shared tree per group rooted at the RP and never creates (S,G) source-tree state, so routers hold only (*,G) entries regardless of how many sources exist. With thousands of simultaneous sources, this dramatically reduces multicast forwarding state on every router compared to any mode that builds per-source state, minimizing CPU and memory impact across the network.