The value of tmnxOspfIfMulticastForwarding specifies the way
multicasts should be forwarded on this interface: not forwarded,
forwarded as data link multicasts, or forwarded as data link
unicasts. Data link multicasting is not meaningful on point-to-point
and NBMA interfaces, and setting tmnxOspfIfMulticastForwarding to 0
effectively disables all multicast forwarding.