Allied Telesis AT-S63 - Manual (Page 221)

AT-S63 Management Software Web Browser Interface User’s Guide
Section II: Advanced Operations 221
reports and times out. The switch forwards the leave request to the
router and simultaneously ceases transmission of any further multicast
packets out the port where the host node is connected.
The Intermediate (Multi-Host) setting is appropriate if there is more
than one host node connected to a switch port, such as when a port is
connected to an Ethernet hub to which multiple host nodes are
connected. With this setting selected the switch continues sending
multicast packets out a port even after it receives a leave request from
a host node on the port. This ensures that the remaining active host
nodes on the port continue to receive the multicast packets. Only after
all of the host nodes connected to a switch port have transmitted leave
requests (or have timed out) does the switch stop sending multicast
packets out the port.
If a switch has a mixture of host nodes, that is, some connected
directly to the switch and others through an Ethernet hub, you should
select the Intermediate Multi-Host Port selection.
Multicast Router Ports Mode
Specifies whether the router ports are determined automatically or if
you enter them manually. If you want the switch to determine the ports
automatically, select Auto-Detect, which is the default. To enter them
yourself, click Manual Select and enter the ports in the field.
Host/Router Timeout Interval
Specifies the time period in seconds after which the switch determines
that a host node has become inactive. An inactive host node is a node
that has not sent an IGMP report during the specified time interval. The
range is from 1 second to 86,400 seconds (24 hours). The default is
260 seconds.
This parameter also specifies the time interval used by the switch in
determining whether a multicast router is still active. The switch makes
the determination by watching for queries from the router. If the switch
does not detect any queries from a multicast router during the
specified time interval, it assumes that the router is no longer active on
the port.
Maximum Multicast Groups
Specifies the maximum number of multicast groups the switch learns.
The range is 1 to 255 groups. The default is 64 multicast groups.
This setting 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.
4. Click Apply.