Asus GigaX - Manual (Page 48)

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4.6.4 Static Multicast
This page can add multicast addresses into the multicast table. The switch
can hold up to 256 multicast entries. All the ports in the group will forward
the specified multicast packets to other ports in the group.
Show Group: selects “Add a new Group” to enter a new entry. Or
select an existing group address to display
MAC Address: selects the multicast address
VLAN: selects the vlan group
CoS: assigns the priority for Class of Service
Click to make the setting effective. Click to refresh the
settings to current value.
Figure 23. Static Multicast
4.6.5 IGMP Snooping
IGMP snooping helps reduce the multicast traffics on the network by
allowing the IGMP snooping function to be turned on or off. When turned
on, the switch snoops the IGMP packets and puts the new group into the
multicast table. However, if the static entries occupy all 256 spaces, the
IGMP snoop does not work normally. The switch only allows 256-layer 2
multicast group.