1-3
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.
Follow these steps to configure dropping unknown multicast packet:
To do... Use the 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.
Follow these commands to display common multicast configuration:
To do... Use the command... Remarks
Display the statistics
information about multicast
source port suppression
display
multicast-source-deny
[ interface interface-type
[ interface-number ] ]
Available in any view
Display the created multicast
MAC table entries
display mac-address
multicast [ static
[ [ mac-address ] vlan vlan-id ]
[ count ] ]
Available in any view