352-001 · Question #784
Which two design option are available to dynamically discover the RP in an IPv6 multicast network? (Choose two)
The correct answer is A. embedded RP C. BSR. IPv6 PIM-SM supports Embedded RP and BSR as standards-based dynamic RP discovery mechanisms, while Auto-RP and MSDP are IPv4-only and MLD is unrelated to RP discovery.
Question
Which two design option are available to dynamically discover the RP in an IPv6 multicast network? (Choose two)
Options
- Aembedded RP
- BMSDP
- CBSR
- DAuto-RP
- EMLD
How the community answered
(43 responses)- A93% (40)
- D5% (2)
- E2% (1)
Why each option
IPv6 PIM-SM supports Embedded RP and BSR as standards-based dynamic RP discovery mechanisms, while Auto-RP and MSDP are IPv4-only and MLD is unrelated to RP discovery.
Embedded RP is an IPv6-specific mechanism defined in RFC 3956 that encodes the RP address directly into the multicast group address itself, allowing any PIM router to extract and discover the RP dynamically with no additional signaling.
MSDP is an IPv4-only inter-domain protocol used to advertise active multicast sources between PIM-SM domains, not a mechanism for discovering the RP within a domain.
Bootstrap Router (BSR) is a standards-based PIM-SM mechanism supported in both IPv4 and IPv6 that dynamically distributes RP-to-group mappings across the multicast domain via bootstrap messages flooded hop-by-hop.
Auto-RP is a Cisco-proprietary RP discovery mechanism that relies on IPv4 multicast groups (224.0.1.39 and 224.0.1.40) and is not supported in IPv6 multicast networks.
MLD is the IPv6 equivalent of IGMP and handles host-to-router group membership reporting; it has no role in RP discovery within a PIM multicast domain.
Concept tested: IPv6 multicast dynamic RP discovery mechanisms
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/ipv6-multicast-pim.html
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