Restrictions for PIM Snooping
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PIM snooping is supported only on IPv4 mroutes.
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When PIM snooping is enabled and IGMP snooping is disabled in the VLAN, multicast packets are not bridged to the local receivers, within the VLAN, even after the local receivers send IGMP join request messages.
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Directly connected sources are supported for bidirectional PIM groups. Traffic from directly connected sources is forwarded to the designated router and the designated forwarder for a VLAN. In some cases, a nondesignated router can receive a downstream (S, G) join message. For source-only networks, the initial unknown traffic is flooded only to the designated routers and designated forwarders.
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All (S,G) mroutes are processed as (*,G) mroutes by the router.
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Non-PIMv2 multicast routers will not receive traffic if PIM snooping is enabled.