Operation Manual – Multicast
H3C S3100 Series Ethernet Switches Chapter 3 Common Multicast Configuration
3-3
 Note:
z 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-address multicast command, you need to remove the entry first, create this
entry 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 a
multicast MAC address, and you cannot configure a multicast MAC address on an
aggregation port.
z You cannot configure a multicast MAC address starting with 01005e in an
IGMP-Snooping-enabled VLAN. You can do that if IGMP Snooping is not enabled in
the VLAN.
3.1.3 Configuring Dropping Unknown Multicast Packets
Generally, if the multicast address of the multicast packet received on the switch is not
registered on the local switch, the packet will be flooded in the VLAN. When the
function of dropping unknown multicast packets 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 3-6 Configure dropping unknown multicast packet
Operation Command Remarks
Enter system view system-view
—
Configure dropping
unknown multicast
packets
unknown-multic
ast drop enable
Required
By default, the function of dropping
unknown multicast packets is disabled.
3.2 Displaying Common Multicast Configuration
After the above-described configuration, you can use the display command in any view
to verify the configuration.
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