SMC Networks ADSL Barricade SMC7204BRA User Manual page 150

Configuring IP Filters and Blocked Protocols
IPV6 Multicast This field displays IP Multicasting under IP Protocol version 6.
802.1.Q
To block a protocol, click the appropriate check box, and click
[Submit]. After you have verified that the device continues to
function as expected, click the [Admin] tab. Click [Commit &
Reboot] in the task bar, then click [Commit] to save your changes
to the permanent memory.
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See IP Multicast above.
This IEEE specification defines a protocol for virtual LANs on
Ethernet networks. A virtual LAN is a group of PCs that function as
a local area network, even though the PCs may not be physically
connected. They are commonly used to facilitate administration
of large networks.