wfPimIfDownstreamIgmpRelayEnable
1.3.6.1.4.1.18.3.5.3.14.2.1.12
Enable/disable support for IGMP Relay as downstream
router. By default, we disable this support.
By enabling this support, PIM router is allowed to
receive multicast data from IGMP Relay downstream,
encapsulate it within Register, and send it to RP.
If this mib is enabled for an interface, all other
PIM routers on the same physical link as this interface
should have this mib enabled for the same interface.