H3C S5100-SI

3-2
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.
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 which the multicast packet belongs to. 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 3-3 Configure dropping unknown multicast packet
Operation Command Remarks
Enter system view system-view —
Configure dropping
unknown multicast
packets
unknown-multicast drop
enable
Required
By default, the function of dropping
unknown multicast packets is disabled.
Displaying Common Multicast Configuration
After the above-described configuration, you can use the display command in any view to verify the
configuration.
Table 3-4 Display common multicast configuration
Operation Command Remarks
Display the created multicast
MAC table entries
display mac-address multicast
[ static { { { mac-address vlan vlan-id
| vlan vlan-id } [ count ] } | count } ]
You can execute the
display commands in
any view.