6-3z If the multicast MAC address entry to be created already exists, the system gives you a prompt.z If you want to add a port to a multicast MAC address entry created through the mac-addressmulticast command, you need to remove the entry first, create this entry again, and then add thespecified port to the forwarding ports of this entry.z You cannot enable link aggregation on a port on which you have configured a multicast MACaddress, and you cannot configure a multicast MAC address on an aggregation port.z You cannot configure a multicast MAC address starting with 01005e in anIGMP-Snooping-enabled VLAN. You can do that if IGMP Snooping is not enabled in the VLAN.Configuring Dropping Unknown Multicast PacketsGenerally, if the multicast address of the multicast packet received on the switch is not registered on thelocal switch, the packet will be flooded in the VLAN. When the function of dropping unknown multicastpackets is enabled, the switch will drop any multicast packets whose multicast address is not registered.Thus, the bandwidth is saved and the processing efficiency of the system is improved.Table 6-6 Configure dropping unknown multicast packetOperation Command RemarksEnter system view system-view —Configure droppingunknown multicast packetsunknown-multicastdrop enable[ pon-ignore ]RequiredBy default, the function of dropping unknownmulticast packets is disabled.z The S3100-EI series Ethernet switches support the pon-ignore keyword.z An S3100-C-EPON-EI series Ethernet switch with an ONU sub-card can operate as an EPONONU. To disable an EPON ONU from dropping unknown unicast packets, use theunknown-multicast drop enable [ pon-ignore ] command.Displaying Common Multicast ConfigurationAfter the above-described configuration, you can use the display command in any view to verify theconfiguration.
