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A company wants to enforce source-specific multicasting (SSM) for several multicast streams.
This is the configuration:
Some multicast receivers support IGMPv3.
Other receivers that need to stream support IGMPv2 only.
The multicast receivers’ default routers enable IGMPv3 on the interfaces associated with their subnets.
The routers are correctly configured to enable the IGMPv3 receivers to receive the stream from the correct
source
Which setting do the receivers’ routers require to support the IGMPV2 devices?

A.
An SSM policy that selects the IGMPv2 devices and binds them to an RP address

B.
An SSM map that sets a rendezvous point (RP) for each multicast address

C.
An SSM policy that selects the appropriate multicast destinations and binds them to an RP address

D.
An SSM map that sets the correct source for each multicast address

Explanation:
IGMP SSM mapping
The IGMP SSM mapping feature provides SSM support for receiver hosts that are running IGMPv1 or IGMPv2.
This feature is implemented by configuring static IGMP SSM mappings on the IGMP-enabled routers.
The SSM model assumes that the IGMP-enabled routers have identified the desired multicast sources when
receivers join multicast groups.
• A host running IGMPv3 can explicitly specify multicast source addresses in its reports.
• A host running IGMPv1 or IGMPv2, however, cannot specify multicast source addresses in its reports. In this
case, you must configure the IGMP SSM mapping feature to translate the (*, G) information in the IGMPv1 or
IGMPv2 reports into (G, INCLUDE, (S1, S2…)) information
HP MSR Router Series, IP Multicast Configuration Guide(V7)
http://h20565.www2.hp.com/hpsc/doc/public/display?sp4ts.oid=6796027&docId=emr_nac04412136&docLocale=en_US

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