This read-write attribute controls whether non-IP multicast traffic is forwarded upstream, overriding any other multicast filtering specifically for non-IP multicast packets; default is enable. It exists to handle legacy, non-IP multicast protocols separately from ordinary IP multicast, so an admin can allow or block that older traffic class independently. For example, an operator wanting to eliminate residual legacy non-IP multicast chatter from an old application would set stuEtherNonIpMultiEn to disable without affecting standard IP multicast/IGMP traffic.