Allied Telesis AT-S39 - Manual (Page 234)

Section III: Web Browser Management
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This parameter is useful with networks that contain a large
number of multicast groups. You can use the parameter to
prevent the switch’s MAC address table from filling up with
multicast addresses, leaving no room for dynamic or static MAC
addresses. The range is 1 address to 2048 addresses. The default is
256 multicast addresses.
Multicast Router Port(s)
Specifies the port on the switch to which the multicast router is
detected. You can let the switch determine this automatically by
selecting Auto Detect, or you can specify the port yourself by
clicking on the ports in the graphical image. A white port indicates
a multicast router port.
5. If desired, you can use the graphical image in the window to indicate
which ports on the switch are connected to multicast routers.
By default, the switch will automatically detect the presence of
multicast routers by watching for queries on its ports. Once it has
received a query, the switch notes the port on which the query
was received and identifies the port as a multicast port.
If desired, you deactivate this auto-detection of multicast routers
and indicate the multicast router ports yourself. To deactivate the
auto-detection, click on the Auto Detect check box. If the check
box is empty, auto-detect is deactivated.
To indicate the multicast router ports manually, use the graphical
image of the switch. Clicking a port toggles it to white, indicating
that the port is connected to a multicast router.
6. After setting the IGMP parameters, click Apply.