350-501 · Question #74
An operations engineer must implement IPv6 multicast leveraging the multicast group address FF70::/12. Which two Cisco IOS XE configurations are needed to accomplish this task? (Choose two.)
The correct answer is B. Apply the ipv6 pim command in all interfaces of all IPv6 routers in the IPv6 multicast domain. C. Apply the ipv6 multicast-routing command in all IPv6 routers in the IPv6 multicast domain.. To implement IPv6 multicast using PIM, you must enable IPv6 multicast routing globally on all routers and then enable PIM on all relevant interfaces within the IPv6 multicast domain.
Question
An operations engineer must implement IPv6 multicast leveraging the multicast group address FF70::/12. Which two Cisco IOS XE configurations are needed to accomplish this task? (Choose two.)
Options
- AApply the ipv6 mid ssm-map enable and ipv6 mid ssm-map static commands only on the RP IPv6
- BApply the ipv6 pim command in all interfaces of all IPv6 routers in the IPv6 multicast domain.
- CApply the ipv6 multicast-routing command in all IPv6 routers in the IPv6 multicast domain.
- DApply the ipv6 pim rp-address command only on RP IPv6 router.
- EApply the ipv6 pim bsr candidate rp command on the IPv6 routers that announce themselves as
How the community answered
(32 responses)- A3% (1)
- B88% (28)
- D6% (2)
- E3% (1)
Why each option
To implement IPv6 multicast using PIM, you must enable IPv6 multicast routing globally on all routers and then enable PIM on all relevant interfaces within the IPv6 multicast domain.
The FF70::/12 range is for PIM Source Specific Multicast (SSM), but the specific commands "ipv6 mid ssm-map enable" and "ipv6 mid ssm-map static" are typically for mapping Any-Source Multicast (ASM) ranges to SSM and are not universally required for all SSM deployments or general IPv6 multicast.
The "ipv6 pim" command must be applied to all interfaces participating in the IPv6 multicast domain to enable PIM on those interfaces, allowing them to exchange PIM messages and build multicast forwarding trees.
The "ipv6 multicast-routing" command must be enabled globally on every IPv6 router in the multicast domain to activate the IPv6 multicast forwarding plane.
The "ipv6 pim rp-address" command configures a static Rendezvous Point (RP) and is used for Any-Source Multicast (ASM) or Bidirectional PIM, not specifically for the FF70::/12 (SSM) range, and it would be applied where an RP is needed, not necessarily "only on RP".
The "ipv6 pim bsr candidate rp" command is used for dynamic RP discovery in ASM environments, specifically for Bidirectional PIM or PIM-SM, and is not required for basic IPv6 multicast with SSM, which FF70::/12 implies.
Concept tested: IPv6 Multicast PIM configuration
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_pim/configuration/xe-3s/imc_pim-xe-3s-book/imc_cfg-ipv6-mc.html
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