What is determined by running the same hash algorithm on all PIMv2 routers?

Question

Options

• AThe SPT from the RP to the multicast source
• BThe SPT from the last hop router to the multicast source
• CAuto RP election
• DWhich BSR to use for a particular multicast group
• EWhich RP to use from a set of candidate RPs in the RP set

• A
  2% (1)
• B
  4% (2)
• D
  8% (4)
• E
  87% (45)

Explanation

In PIMv2, the Bootstrap Router (BSR) mechanism distributes a candidate RP set to all routers in the PIM domain. When multiple candidate RPs exist for a multicast group, all routers independently run the same hash algorithm (defined in RFC 4601) against the group address and each candidate RP address. Because all routers use the same algorithm and the same inputs, they all arrive at the same RP selection decision without needing additional coordination. This ensures consistent, distributed RP selection across the entire domain. This process does not determine SPT paths (A, B), is not used for Auto-RP elections (C), nor does it select which BSR to use (D) - BSR election uses a separate priority/address comparison mechanism.

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