This read-only field reports the maximum number of MAC-multicast forwarding entries the switch's hardware can hold. An administrator checks this to understand the scaling ceiling for multicast groups before deciding whether more filtering, like IGMP snooping, is needed to conserve table space. For example, if a network's multicast application count approaches the value reported by rlMacMulticastMaxEntriesNum, the admin knows table exhaustion could soon cause multicast to flood instead of forward selectively.