352-001 · Question #298
Which of the following design options meet the requirement to provide IPv6 interdomain multicast?
The correct answer is B. PIM SSM. PIM SSM is the only listed option that natively supports IPv6 interdomain multicast without relying on IPv4-specific mechanisms.
Question
Which of the following design options meet the requirement to provide IPv6 interdomain multicast?
Options
- AMSDP
- BPIM SSM
- CAuto-RP
- DPIM dense mode
How the community answered
(36 responses)- A3% (1)
- B92% (33)
- C6% (2)
Why each option
PIM SSM is the only listed option that natively supports IPv6 interdomain multicast without relying on IPv4-specific mechanisms.
MSDP (Multicast Source Discovery Protocol) is an IPv4-only protocol used to interconnect PIM-SM domains and has no IPv6 equivalent or support.
PIM Source-Specific Multicast (SSM) operates independently of the rendezvous point model and supports IPv6 natively. It allows receivers to specify both the group and the source address, enabling interdomain multicast across IPv6 networks without requiring MSDP or any IPv4 dependency. This makes it the correct design choice for IPv6 interdomain multicast.
Auto-RP is a Cisco-proprietary mechanism for dynamically distributing RP information in PIM-SM networks and only functions in IPv4 environments.
PIM dense mode uses a flood-and-prune mechanism unsuitable for interdomain multicast and does not scale across administrative boundaries for IPv6.
Concept tested: IPv6 interdomain multicast using PIM SSM
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-16/imc-pim-xe-16-book/imc-ipv6-pim.html
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