Hash-based PIM RPF selection

Use hash-based Protocol Independent Multicast (PIM) reverse path forwarding (RPF) selection to route multicast traffic for a specific source and group (S, G) consistently through the same upstream node. The device uses multi-level hashing of PIM neighbor attributes such as router ID, cluster ID, and interface ID for consistent routing. For configuration, include the hash-based-rpf-selection statement under the [edit protocols pim] hierarchy.