Operation Manual – MulticastH3C S3100 Series Ethernet Switches Chapter 3 Common Multicast Configuration3-3Note:z If the multicast MAC address entry to be created already exists, the system givesyou a prompt.z If you want to add a port to a multicast MAC address entry created through themac-address multicast command, you need to remove the entry first, create thisentry again, and then add the specified port to the forwarding ports of this entry.z You cannot enable link aggregation on a port on which you have configured amulticast MAC address, and you cannot configure a multicast MAC address on anaggregation 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 inthe VLAN.3.1.3 Configuring Dropping Unknown Multicast PacketsGenerally, if the multicast address of the multicast packet received on the switch is notregistered on the local switch, the packet will be flooded in the VLAN. When thefunction of dropping unknown multicast packets is enabled, the switch will drop anymulticast packets whose multicast address is not registered. Thus, the bandwidth issaved and the processing efficiency of the system is improved.Table 3-6 Configure dropping unknown multicast packetOperation Command RemarksEnter system view system-view —Configure droppingunknown multicastpacketsunknown-multicast drop enableRequiredBy default, the function of droppingunknown multicast packets is disabled.3.2 Displaying Common Multicast ConfigurationAfter the above-described configuration, you can use the display command in any viewto verify the configuration.
