Company XYZ network runs IPv4 and IPv6 and they want to introduce a multidomain, multicast-based network. The new design should use a flavor of PIM that forwards traffic using SPT. Which technology meets this requirement?
PIM-SSM (Source-Specific Multicast) is optimized for multicast delivery directly via Shortest Path Tree (SPT) only.
SSM eliminates the need for shared trees (RPs), simplifies the control plane, and avoids rendezvous points altogether.
This design is highly scalable in multidomain and IPv6 environments, fully aligned with CCDE v3.1 best practices for modern multicast deployments.
Why other options are incorrect:
A: PIM-DM floods traffic initially, not SPT-based.
B: PIM-SM uses shared trees first and may switch to SPT later.
D: Bidir-PIM uses shared trees exclusively, not SPT.
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